Absorption type combined cooling and heating system and circulating working medium concentration adjusting method thereof

Abstract

The application relates to an absorption type cold and heat combined supply system and a circulating working medium concentration adjusting method thereof, the absorption type cold and heat combined supply system comprising an end user unit, a cold and heat combined supply unit connected to the end user unit, and a heating unit and a concentration adjusting unit connected to the cold and heat combined supply unit, the absorption type cold and heat combined supply system realizing small-range adjustment of the circulating working medium concentration of the whole system by adjusting the liquid level height of a gas-liquid separator of the cold and heat combined supply unit, realizing large-range adjustment of the circulating working medium concentration of the whole system and maintaining the charging amount of the circulating working medium in the system by adjusting the liquid level height of a first storage tank and a second storage tank of the concentration adjusting unit, giving consideration to the optimization adjustment of the charging amount of the circulating working medium in the system and the circulating working medium concentration of the system, and ensuring that the system can continuously and efficiently and stably operate under different working conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy utilization, in particular to an absorption type cold and heat combined supply system and a circulating working medium concentration adjusting method thereof. BACKGROUND

[0002] The absorption type system is a device driven by heat energy and capable of realizing cold and heat combined supply, which can effectively utilize clean and low-carbon energy such as natural gas, biomass energy and solar energy, and realize regional cold and heat combined supply and carbon reduction. However, in most regions of China, the temperature difference between the summer cooling and winter heating environment is large, and the absorption type cold and heat combined supply technology faces the problems of large difference in unit operation condition and large variation range of working medium operation concentration in summer cooling and winter heating. When paying attention to cross-season cold and heat combined supply, the traditional absorption type cold and heat combined supply system often only pays attention to cold storage and heat storage, and ignores the important influence of system concentration on system performance. SUMMARY

[0003] The purpose of the present application is to provide an absorption type cold and heat combined supply system and a circulating working medium concentration adjusting method thereof. The cold and heat combined supply system realizes the adjustment of the charging amount and operation concentration of the circulating working medium by introducing a concentration adjusting unit, ensures the optimal circulating working medium concentration and stable circulating working medium charging amount of the system under different operating conditions, and realizes the continuous and stable high-efficiency operation of the cold and heat combined supply system, which is particularly suitable for cold and heat combined supply systems with large seasonal changes in climate temperature or large diurnal temperature difference.

[0004] An absorption type cold and heat combined supply system, comprising:

[0005] an end user unit;

[0006] a cold and heat combined supply unit connected to the end user unit through a cold carrier medium pipeline and a heat carrier medium pipeline, used for providing cold energy products and heat energy products for the end user unit, and used for small-scale adjustment of the circulating working medium concentration in the absorption type cold and heat combined supply system;

[0007] a heating unit connected to the cold and heat combined supply unit through a heat source pipeline, used for transferring heat energy to a heat source medium, and transferring the heat source medium to the cold and heat combined supply unit through the heat source pipeline to provide energy driving for the cold and heat combined supply unit; and

[0008] a concentration adjusting unit connected to the cold and heat combined supply unit, used for large-scale adjustment of the circulating working medium concentration of the absorption type cold and heat combined supply system when the operating condition of the absorption type cold and heat combined supply system changes greatly.

[0009] In an embodiment of the present application, the concentration adjusting unit comprises a first storage tank connected to the combined cooling heating unit through a first pipe group and a second storage tank connected to the combined cooling heating unit through a second pipe group, and the combined cooling heating unit comprises a gas-liquid separator, the absorption combined cooling heating system realizes small-range adjustment of the concentration of the circulating working medium by adjusting the liquid level of the gas-liquid separator and realizes large-range adjustment of the concentration of the circulating working medium and maintains the charge of the circulating working medium in the absorption combined cooling heating system by adjusting the liquid levels of the first storage tank and the second storage tank.

[0010] In an embodiment of the present application, the combined cooling heating unit reduces the concentration of the circulating working medium of the absorption combined cooling heating system by increasing the liquid level in the gas-liquid separator and increases the concentration of the circulating working medium of the absorption combined cooling heating system by reducing the liquid level of the working medium in the gas-liquid separator, thereby realizing small-range adjustment of the concentration of the circulating working medium; the concentration adjusting unit increases the concentration of the circulating working medium of the absorption combined cooling heating system by increasing the liquid level of the first storage tank and reducing the liquid level of the second storage tank; and reduces the concentration of the circulating working medium of the absorption combined cooling heating system by reducing the liquid level of the first storage tank and increasing the liquid level of the second storage tank, thereby realizing large-range adjustment of the concentration of the circulating working medium.

[0011] In an embodiment of the present application, the concentration adjusting unit further comprises a first inlet valve and a first outlet valve connected to both ends of the first storage tank and a second inlet valve and a second outlet valve connected to both ends of the second storage tank, the first pipe group comprises a first pipe and a second pipe, the second pipe group comprises a third pipe and a fourth pipe, the first inlet valve is connected to the combined cooling heating unit through the first pipe, the first outlet valve is connected to the combined cooling heating unit through the second pipe, the second inlet valve is connected to the combined cooling heating unit through the third pipe, the second outlet valve is connected to the combined cooling heating unit through the fourth pipe, the concentration adjusting unit adjusts the liquid level of the first storage tank by controlling the first inlet valve and the first outlet valve and adjusts the liquid level of the second storage tank by controlling the second inlet valve and the second outlet valve, thereby realizing large-range adjustment of the concentration of the circulating working medium.

[0012] In an embodiment of the present application, the first storage tank is a solution storage tank, the second storage tank is a working medium storage tank, the concentration adjustment unit comprises a solution pump connected to the first storage tank and a liquid ammonia working medium pump connected to the second storage tank, the concentration adjustment unit adjusts the liquid level of the first storage tank through the solution pump, the first inlet valve and the first outlet valve, and adjusts the liquid level of the second storage tank through the liquid ammonia working medium pump, the second inlet valve and the second outlet valve.

[0013] In an embodiment of the present application, the combined cooling and heating unit comprises a combined cooling and heating unit heat source inlet valve connected to the first heat source pipeline of the heat source pipeline, a generator connected to the combined cooling and heating unit heat source inlet valve, a rectifier connected to the steam outlet of the generator, and a condenser connected to the rectifier, a refrigeration working medium intermediate throttling valve, the gas-liquid separator, a refrigeration working medium throttling valve, and an evaporator connected to the rectifier in sequence, the combined cooling and heating unit further comprises a solution heat exchanger connected to the generator, a solution throttling valve connected to the solution heat exchanger, an absorber connected to the solution throttling valve, and a first solution circulating pump connected to the absorber and the solution heat exchanger, wherein,

[0014] The heat source medium of the heating unit enters the generator through the first heat source pipeline and the combined cooling and heating unit heat source inlet valve to complete heat exchange, and then returns to the heating unit through the second heat source pipeline of the heat source pipeline; the solution in the generator completes the generation process with the heat source medium, and the dilute solution produced after the generation process enters the absorber after passing through the solution heat exchanger and the solution throttling valve in sequence, the refrigeration working medium vapor produced in the generation process enters the rectifier to complete the purification process, and then enters the condenser to release condensation heat to become saturated liquid, and then enters the gas-liquid separator through the refrigeration working medium intermediate throttling valve to perform gas-liquid separation, the liquid phase working medium obtained by gas-liquid separation enters the evaporator through the refrigeration working medium throttling valve to complete the refrigeration process, and provides cold energy products for the end user unit, the refrigeration working medium after completing the evaporation enters the absorber and is absorbed by the solution in the absorber to release absorption heat, the absorption heat released by the absorber is combined with the condensation heat released by the condenser to provide heat energy products for the end user unit, and the solution after completing the absorption process returns to the generator through the first solution circulating pump and the solution heat exchanger, thereby completing the working medium circulation process of the absorption type combined cooling and heating system.

[0015] In an embodiment of the application, the first tank is a solution tank, the second tank is a working medium tank, the concentration adjustment unit further comprises a concentration adjustment unit heat source inlet valve connected to the first tank and the heating unit, the first inlet valve is connected to the outlet pipeline of the generator through the first pipeline, the first outlet valve is connected to the generator through the second pipeline, the second inlet valve is connected to the inlet pipeline of the refrigerant medium intermediate throttling valve through the third pipeline, the second outlet valve is connected to the gas-liquid separator through the fourth pipeline, wherein,

[0016] The absorption type cold and heat combined supply system adjusts the liquid level height of the refrigerant medium in the gas-liquid separator by controlling the opening degree of the refrigerant medium intermediate throttling valve and the refrigerant medium throttling valve, so as to realize small-range adjustment of the concentration of the circulating medium, and adjusts the liquid level height of the solution tank and the working medium tank by controlling the opening degree of the cold and heat combined supply unit heat source inlet valve, the concentration adjustment unit heat source inlet valve, the first outlet valve, the first inlet valve, the second inlet valve, the second outlet valve, the refrigerant medium intermediate throttling valve, the refrigerant medium throttling valve and the solution throttling valve, so as to realize large-range adjustment of the concentration of the circulating medium.

[0017] In an embodiment of the application, the cold and heat combined supply unit comprises a cold and heat combined supply unit heat source inlet valve connected to the first heat source pipeline of the heat source pipeline, a generator connected to the cold and heat combined supply unit heat source inlet valve, a rectifier connected to the steam outlet of the generator, and a condenser, a refrigerant medium intermediate throttling valve, an intermediate evaporator, the gas-liquid separator, a refrigerant medium throttling valve, an evaporator connected to the rectifier in sequence, the cold and heat combined supply unit further comprises a solution intermediate throttling valve connected to the generator, an intermediate absorber connected to the solution intermediate throttling valve, a solution throttling valve connected to the intermediate absorber, an absorber connected to the solution throttling valve, and a first solution circulating pump connected to the absorber and the intermediate absorber, wherein,

[0018] The heat source medium enters the generator through the first heat source pipeline and the cold-heat combined unit heat source inlet valve to complete heat exchange, and then returns to the heating unit through the second heat source pipeline of the heat source pipeline; the solution in the generator completes the generation process with the heat source medium, and the dilute solution generated after the generation process enters the intermediate absorber through the solution intermediate throttling valve; the refrigerant vapor generated in the generation process enters the rectifier to complete the purification process, and then enters the condenser to release condensation heat to become saturated liquid, and then enters the intermediate evaporator through the refrigerant intermediate throttling valve to recover the heat in the flue gas generated by the heating unit; the refrigerant after recovering the heat enters the gas-liquid separator to separate into gas phase and liquid phase, wherein the gas phase refrigerant enters the intermediate absorber to complete the intermediate absorption process and generate an intermediate concentration solution, and the intermediate concentration solution enters the absorber through the solution throttling valve; the liquid phase refrigerant enters the evaporator through the refrigerant throttling valve to complete the refrigeration process and provide cold energy products for the end user unit; the refrigerant after evaporation enters the absorber and is absorbed by the solution in the absorber to release absorption heat; the absorption heat released by the absorber and the condensation heat released by the condenser provide heat energy products for the end user unit; the solution after completing the absorption process returns to the generator through the first solution circulating pump and the intermediate absorber to complete the refrigeration cycle of the absorption type cold-heat combined supply system.

[0019] In an embodiment of the present application, the first storage tank is a solution storage tank, the second storage tank is a refrigerant storage tank, the concentration adjusting unit further comprises a second solution circulating pump connected between the first storage tank and the first outlet valve, the first inlet valve is connected to the generator through the first pipeline, the first outlet valve is connected to the generator through the second pipeline, the second inlet valve is connected to the inlet pipeline of the refrigerant intermediate throttling valve through the third pipeline, and the second outlet valve is connected to the inlet pipeline of the refrigerant throttling valve through the fourth pipeline.

[0020] The absorption type cold-heat combined supply system adjusts the liquid level of the refrigerant in the gas-liquid separator by controlling the opening degree of the refrigerant intermediate throttling valve and the refrigerant throttling valve, so as to realize small-range adjustment of the concentration of the circulating refrigerant; the absorption type cold-heat combined supply system adjusts the liquid level of the solution storage tank and the refrigerant storage tank by controlling the opening degree of the first outlet valve, the first inlet valve, the second inlet valve, the second outlet valve, the refrigerant intermediate throttling valve, the refrigerant throttling valve and the solution intermediate throttling valve through the second solution circulating pump, so as to realize large-range adjustment of the concentration of the circulating refrigerant.

[0021] In an embodiment of the present application, the heat and cold supply unit comprises a first heat source pipeline connected to the heat source pipeline, a heat and cold supply unit heat source inlet valve connected to the first heat source pipeline, a generator connected to the heat and cold supply unit heat source inlet valve, a rectifier connected to a steam outlet of the generator, and a condenser connected to the rectifier, a refrigeration medium intermediate throttle valve, an intermediate evaporator, the gas-liquid separator, a refrigeration medium throttle valve, and an evaporator connected to the rectifier in sequence, the heat and cold supply unit further comprises a low-position liquid discharge valve and a solution intermediate throttle valve connected to the generator, an intermediate absorber connected to the solution intermediate throttle valve, a solution throttle valve connected to the intermediate absorber, an absorber connected to the solution throttle valve, and a first solution circulating pump connected to the absorber and the intermediate absorber, wherein,

[0022] The heat source medium enters the generator through the first heat source pipeline and the heat and cold supply unit heat source inlet valve to complete heat exchange, and then returns to the heating unit through a second heat source pipeline of the heat source pipeline; the solution in the generator completes the generation process with the heat source medium, the dilute solution produced after the generation process enters the intermediate absorber through the solution intermediate throttle valve, the refrigeration medium steam produced in the generation process enters the rectifier to complete the purification process, and then enters the condenser to release condensation heat to become saturated liquid, and then enters the intermediate evaporator through the refrigeration medium intermediate throttle valve to recover heat in the flue gas produced by the heating unit, the refrigeration medium after recovering heat enters the gas-liquid separator to separate gas and liquid, the gas-phase working medium obtained by gas-liquid separation enters the intermediate absorber to complete the absorption process and produce an intermediate concentration solution, the intermediate concentration solution enters the absorber through the solution throttle valve, the liquid-phase working medium obtained by gas-liquid separation enters the evaporator through the refrigeration medium throttle valve to complete the refrigeration process and provide cold energy products for the end user unit, the refrigeration medium after evaporation enters the absorber and is absorbed by the solution in the absorber to release absorption heat, the absorption heat released by the absorber and the condensation heat released by the condenser provide heat energy products for the end user unit, and the solution after completing the absorption process returns to the generator through the first solution circulating pump and the intermediate absorber, thereby completing the working medium circulation process of the absorption heat and cold supply system.

[0023] In an embodiment of the present application, the first storage tank and the second storage tank are both solution storage tanks, the first inlet valve is connected to the low-position liquid discharge valve through the first pipeline, the first outlet valve is connected to the generator through the second pipeline, the second inlet valve is connected to the low-position liquid discharge valve through the third pipeline, and the second outlet valve is connected to the absorber through the fourth pipeline, wherein,

[0024] The absorption type cold and heat combined supply system adjusts the liquid level of the refrigerant in the gas-liquid separator by controlling the opening degree of the refrigerant intermediate throttle valve and the refrigerant throttle valve, so as to realize small range adjustment of the concentration of the circulating working medium; the absorption type cold and heat combined supply system realizes solution replacement between the first storage tank, the second storage tank and the cold and heat combined supply unit by vacuum treatment of the first storage tank, the second storage tank and the cold and heat combined supply unit and by controlling the opening degree of the first inlet valve, the first outlet valve, the second inlet valve, the second outlet valve and the low-liquid discharge valve, so as to realize large range adjustment of the concentration of the circulating working medium.

[0025] In an embodiment of the present application, the heating unit comprises a heat energy collector and a heat source medium circulating pump connected to the heat energy collector, the heat energy collector is used to drive heat energy generation in series or in parallel or in series-parallel form by using one or more of biomass energy, solar energy, geothermal energy, fossil energy and hydrogen energy, and to transfer the heat energy to the heat source medium, the heat source medium is input into the cold and heat combined supply unit through the heat source medium circulating pump and the first heat source pipeline of the heat source pipeline.

[0026] In an embodiment of the present application, the heat energy collector provides heat energy for the heat source medium by burning energy, and the flue gas generated by the burning energy of the heat energy collector is directly discharged to the environment or discharged to the environment after heat exchange and cooling by the intermediate evaporator of the cold and heat combined supply unit.

[0027] In an embodiment of the present application, the circulating working medium of the absorption type cold and heat combined supply system is any one or a combination of more than one of ammonia water, lithium bromide aqueous solution, ammonia salt solution and ionic solution.

[0028] A method for adjusting the concentration of the circulating working medium of an absorption type cold and heat combined supply system, comprising the steps of:

[0029] A, controlling the valve opening degree of the refrigerant intermediate throttle valve and the refrigerant throttle valve of the cold and heat combined supply unit, adjusting the liquid level of the refrigerant in the gas-liquid separator, so as to realize small range adjustment of the concentration of the circulating working medium; and

[0030] B, adjusting the liquid level of the first storage tank and the second storage tank of the concentration unit, or replacing the solution in the first storage tank, the second storage tank and the cold and heat combined supply unit by vacuum treatment of the first storage tank, the second storage tank and the cold and heat combined supply unit, so as to realize large range adjustment of the concentration of the circulating working medium.

[0031] In an embodiment of the present application, the first storage tank is a solution storage tank, the second storage tank is a working medium storage tank, and the step B comprises the steps of:

[0032] B1, increasing the liquid level of the dilute solution in the first tank and decreasing the liquid level of the working medium in the second tank, to increase the concentration of the circulating working medium of the absorption-based combined cooling and heating system; and

[0033] B2, decreasing the liquid level of the dilute solution in the first tank and increasing the liquid level of the working medium in the second tank, to decrease the concentration of the circulating working medium of the absorption-based combined cooling and heating system.

[0034] In an embodiment of the present application, in the step B, the liquid level of the first tank is adjusted by a solution pump, a first inlet valve and a first outlet valve, and the liquid level of the second tank is adjusted by a liquid ammonia working medium pump, a second inlet valve and a second outlet valve.

[0035] In an embodiment of the present application, the step B1 comprises the steps of:

[0036] B11, closing the concentration adjustment unit heat source inlet valve, the first outlet valve and the second inlet valve, opening the first inlet valve and the second outlet valve, adjusting the opening degrees of the first inlet valve and the solution throttle valve, so that part of the dilute solution enters the first tank and causes the liquid level of the first tank to rise; and

[0037] B12, adjusting the opening degrees of the second outlet valve and the refrigeration working medium throttle valve, so that part of the working medium enters the gas-liquid separator and causes the liquid level of the second tank to decrease.

[0038] In an embodiment of the present application, the step B1 comprises the steps of:

[0039] B21, closing the concentration adjustment unit heat source inlet valve and the first inlet valve, adjusting the opening degrees of the refrigeration working medium intermediate throttle valve, the second inlet valve, the refrigeration working medium throttle valve and the second outlet valve, to increase the liquid level of the second tank; and

[0040] B22, closing the second inlet valve and the second outlet valve, opening the concentration adjustment unit heat source inlet valve, closing the combined cooling and heating unit heat source inlet valve and the first inlet valve, heating the first tank by a heating unit, when the pressure of the first tank is higher than that of the generator, opening and controlling the first outlet valve, to decrease the liquid level of the first tank.

[0041] In an embodiment of the present application, the step B1 comprises the steps of:

[0042] B11, closing the first outlet valve and the second inlet valve, opening the first inlet valve and the second outlet valve, adjusting the opening degrees of the first inlet valve and the solution intermediate throttle valve, so that part of the dilute solution enters the first tank and causes the liquid level of the first tank to rise; and

[0043] B12, adjusting the opening degree of the second outlet valve and the refrigerant throttling valve, so that part of the refrigerant enters the combined cooling heating and power unit, and the liquid level of the second storage tank is lowered.

[0044] In an embodiment of the present application, the step B2 comprises the steps of:

[0045] B21, adjusting the opening degree of the refrigerant intermediate throttling valve, the second inlet valve, the refrigerant throttling valve and the second outlet valve, so as to increase the liquid level of the second storage tank; and

[0046] B22, opening the first outlet valve, and pumping the dilute solution in the second storage tank into the generator through the second pipeline by the second solution circulating pump, so as to lower the liquid level of the first storage tank.

[0047] In an embodiment of the present application, the first storage tank and the second storage tank are both solution storage tanks, and the step B1 comprises the steps of:

[0048] B11, first performing vacuum treatment on the first storage tank, closing the first outlet valve, and opening the low-position liquid discharge valve and the first inlet valve, so that the solution in the combined cooling heating and power unit enters the first storage tank through the low-position liquid discharge valve, thereby increasing the liquid level of the first storage tank; and

[0049] B12, first performing vacuum treatment on the combined cooling heating and power unit, closing the second inlet valve, and opening the second outlet valve, so that the concentrated solution in the second storage tank enters the combined cooling heating and power unit, thereby lowering the liquid level of the second storage tank.

[0050] In an embodiment of the present application, the step B2 comprises the steps of:

[0051] B21, first performing vacuum treatment on the second storage tank, closing the second outlet valve, and opening the low-position liquid discharge valve and the second inlet valve, so that the concentrated solution in the combined cooling heating and power unit enters the second storage tank through the low-position liquid discharge valve, thereby increasing the liquid level of the second storage tank; and

[0052] B22, first performing vacuum treatment on the combined cooling heating and power unit, closing the first inlet valve and the low-position liquid discharge valve, and opening the first outlet valve, so that the dilute solution in the first storage tank enters the combined cooling heating and power unit through the first inlet valve, thereby lowering the liquid level of the first storage tank.

[0053] The absorption combined cooling heating and power system of the present application can directly realize self-regulation of the concentration of the circulating refrigerant in a small range by controlling the liquid level of the vapor-liquid separator, and the adjustment structure and mode are simple.

[0054] The absorption type cold and heat combined supply system of the application realizes the adjustment of the charging amount and the operating concentration of the circulating working medium by introducing the concentration adjusting unit, ensures the optimal circulating working medium concentration and stable circulating working medium charging amount of the system under different working conditions, so as to realize the continuous and stable high-efficiency operation of the cold and heat combined supply system, and is especially suitable for the cold and heat combined supply system with large seasonal change of climate temperature or large diurnal temperature difference.

[0055] The application realizes the replacement of the solution between the first storage tank and the second storage tank and the cold and heat combined supply unit by controlling the liquid level height of the first storage tank and the second storage tank of the concentration adjusting unit or by vacuum processing the first storage tank, the second storage tank and the cold and heat combined supply unit, so as to realize the adjustment of the concentration of the circulating working medium of the whole system and maintain the charging amount of the circulating working medium in the whole system, and the optimal adjustment of the charging amount and the concentration of the circulating working medium in the system is considered, so as to ensure the continuous and high-efficiency stable operation of the system under different working conditions, and the control mode of the application is simple, convenient and easy to realize.

[0056] The further purposes and advantages of the application will be fully embodied by understanding the following description and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0057] Figure 1 The structure schematic view of the absorption type cold and heat combined supply system of the first preferred embodiment of the application;

[0058] Figure 2 The structure schematic view of the absorption type cold and heat combined supply system of the second preferred embodiment of the application;

[0059] Figure 3 The structure schematic view of the absorption type cold and heat combined supply system of the third preferred embodiment of the application.

[0060] EXPLANATION OF DRAWINGS:

[0061] Concentration adjustment unit 10; concentration adjustment unit heat source inlet valve 11, first outlet valve 12; first storage tank 13; first inlet valve 14; second inlet valve 15; second storage tank 16; second outlet valve 17; second solution circulating pump 18; heating unit 20; heat energy collector 21; heat source medium circulating pump 22; combined cooling and heating unit 30; combined cooling and heating unit heat source inlet valve 31; generator 32; rectifier 33; condenser 34; refrigerant intermediate throttle valve 35; vapor-liquid separator 36; refrigerant throttle valve 37; evaporator 38; absorber 39; first solution circulating pump 301; solution heat exchanger 302; solution throttle valve 303; intermediate evaporator 304; solution intermediate throttle valve 306; intermediate absorber 307; low-position liquid discharge valve 308; end user unit 40; first heat source pipeline 51; second heat source pipeline 52; third heat source pipeline 53; fourth heat source pipeline 54; first pipeline 61; second pipeline 62; third pipeline 63; fourth pipeline 64; first cold carrier medium pipeline 71; second cold carrier medium pipeline 72; first heat carrier medium pipeline 73; second heat carrier medium pipeline 74, wherein the solid arrow head points to the solution flow direction, and the dashed arrow head points to the gas flow direction. DETAILED DESCRIPTION

[0062] The following description is provided to enable those skilled in the art to realize the present application. The preferred embodiments described in the following description are only examples of the present application and other obvious modifications are possible. The basic principles defined in the following description can be applied to other embodiments, modifications, improvements, equivalents and other technical solutions without departing from the spirit and scope of the present application.

[0063] Those skilled in the art should understand that in the disclosure of the present application, the terms "vertical", "horizontal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation of the present application.

[0064] It can be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number.

[0065] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "installation", "connection", "linkage" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0066] To solve the problem of large difference in concentration of circulating working medium of the existing cold and heat combined supply system under different working conditions, the present application provides an absorption type cold and heat combined supply system with adjustable concentration, so as to ensure that the cold and heat combined supply system can efficiently realize summer cooling and winter heating. Figures 1 to 3 As shown in the figure, the specific structure and working process of the absorption type cold and heat combined supply system with adjustable concentration provided by the present application are illustrated.

[0067] Embodiment 1

[0068] Please refer to Figure 1 , the specific structure of the absorption type cold and heat combined supply system provided by the first preferred embodiment of the present application is illustrated. Specifically, the absorption type cold and heat combined supply system comprises a concentration adjusting unit 10, a heating unit 20, a cold and heat combined supply unit 30, and an end user unit 40, wherein the cold and heat combined supply unit 30 is connected to the end user unit 40 through a cold medium pipeline and a heat medium pipeline, for providing cold product and heat energy product to the end user unit 40, and for small-scale adjusting the concentration of circulating working medium in the absorption type cold and heat combined supply system; the heating unit 20 is connected to the cold and heat combined supply unit 30 through a heat source pipeline, for transferring heat energy to heat source medium, and transferring the heat source medium to the cold and heat combined supply unit 30 through the heat source pipeline, so as to provide energy driving for the cold and heat combined supply unit 30; the concentration adjusting unit 10 is connected to the cold and heat combined supply unit 30, for large-scale adjusting the concentration of circulating working medium in the absorption type cold and heat combined supply system when the working condition of the absorption type cold and heat combined supply system changes greatly.

[0069] Specifically, the heating unit 20 is connected to the combined cooling and heating unit 30 via the first heat source pipe 51 and the second heat source pipe 52 of the heat source pipeline. The concentration adjustment unit 10 and the heating unit 20 are connected via the third heat source pipe 53 and the fourth heat source pipe 54. The combined cooling and heating unit 30 is connected to the end user unit 40 via the first cooling medium pipe 71 and the second cooling medium pipe 72 of the cooling medium pipeline, and the first heat transfer medium pipe 73 and the second heat transfer medium pipe 74 of the heat transfer medium pipeline. The combined cooling and heating unit 30 is connected to the concentration adjustment unit 10 via the first pipe 61 and the second pipe 62 of the first pipeline group, and the third pipe 63 and the fourth pipe 64 of the second pipeline group.

[0070] Furthermore, the heating unit 20 includes a heat collector 21 and a heat source medium circulation pump 22 connected to the heat collector 21. The heat collector 21 can utilize one or more energy sources selected from biomass energy, solar energy, geothermal energy, fossil energy, and hydrogen energy to generate heat energy, and the heat collector 21 can be driven by the aforementioned heat-generating energy sources in parallel or series connection.

[0071] In this embodiment, fuel combustion provides heat to the heat collector 21, such as... Figure 1 As shown, fuel and air F1 enter the heat collector 21 for combustion, and the heat generated by combustion is transferred to the heat source medium. The heat source medium enters the combined cooling and heating unit 30 through the first heat source pipe 51 of the heat source pipeline. The flue gas F2 generated by combustion is directly discharged into the environment.

[0072] The combined cooling and heating unit 30 described in this embodiment is an example of a single-stage absorption system. However, the concentration regulation unit is not limited to use in single-stage absorption combined cooling and heating systems; it can also be used in other single-stage absorption systems and their evolutions, multi-stage absorption systems and their evolutions, multi-effect absorption systems and their evolutions, or other absorption systems. Any system similar to or the same as the concentration regulation mechanism and regulation scheme in this invention is within the scope of protection of this invention.

[0073] Specifically, the cold heat supply unit 30 includes a cold heat supply unit heat source inlet valve 31 connected to the first heat source pipeline 51 of the heat source pipeline, a generator 32 connected to the cold heat supply unit heat source inlet valve 31, a rectifier 33 connected to the steam outlet of the generator 32, and a condenser 34, a refrigerant intermediate throttle valve 35, the gas-liquid separator 36, a refrigerant throttle valve 37, and an evaporator 38 connected to the rectifier 33 in sequence, the cold heat supply unit 30 further includes a solution heat exchanger 302 connected to the generator 32, a solution throttle valve 303 connected to the solution heat exchanger 302, an absorber 39 connected to the solution throttle valve 303, and a first solution circulating pump 301 connected to the absorber 39 and the solution heat exchanger 302.

[0074] Specifically, the working process of the absorption type cold heat supply system is as follows: the heat source medium of the heating unit 20 enters the generator 32 through the first heat source pipeline 51 and the cold heat supply unit heat source inlet valve 31 to complete heat exchange, and then returns to the heat energy collector 21 through the second heat source pipeline 52 of the heat source pipeline; the solution in the generator 32 completes the generation process with the heat source medium, and the dilute solution produced after the generation process enters the absorber 39 after passing through the solution heat exchanger 302 and the solution throttle valve 303 in sequence, the refrigerant vapor produced in the generation process enters the rectifier 33 to complete the purification process, and then enters the condenser 34 to release condensation heat to become saturated liquid, and then enters the gas-liquid separator 36 through the refrigerant intermediate throttle valve 35 to complete gas-liquid separation, the liquid-phase working medium obtained by gas-liquid separation enters the evaporator 38 through the refrigerant throttle valve 37 to complete the refrigeration process, and provides cold energy products for the end user unit, and the refrigerant after evaporation enters the absorber 39 to be absorbed by the solution in the absorber 39 to release absorption heat, the absorption heat released by the absorber 39 and the condensation heat released by the condenser 34 provide heat energy products for the end user unit, and the solution after the absorption process returns to the generator 32 through the first solution circulating pump 301 and the solution heat exchanger 302 to complete the working medium circulation process of the absorption type cold heat supply system.

[0075] Since the optimal circulating working concentration of the system is affected by the ambient temperature, the optimal working concentration of the system will have a huge difference in different seasons, different times, and different climates. The adjustment of the system operating concentration is described clearly and completely below, and the system circulating working medium is taken as ammonia water solution as an example for introduction. However, the circulating working medium of the present application is not limited to ammonia water working medium, but also includes lithium bromide aqueous solution, ammonia salt solution, ionic solution, and multi-component mixed solution composed of the above solutions.

[0076] Further, the concentration adjustment unit 10 comprises a concentration adjustment unit heat source inlet valve 11, a first outlet valve 12, a first storage tank 13, a first inlet valve 14, a second inlet valve 15, a second storage tank 16, and a second outlet valve 17, wherein the concentration adjustment unit heat source inlet valve 11 is connected to the first storage tank 13 and the heat energy collector 21, the first inlet valve 14 is connected to one end of the first storage tank 13 and connected to the generator 32 through the first pipeline 61, the first outlet valve 12 is connected to the other end of the first storage tank 13 and connected to the generator 32 through the second pipeline 62, the second inlet valve 15 is connected to one end of the second storage tank 16 and connected to the pipeline between the condenser 34 and the refrigerant intermediate throttle valve 35 through the third pipeline 63, and the second outlet valve 17 is connected to the other end of the second storage tank 16 and connected to the gas-liquid separator 36 through the fourth pipeline 64.

[0077] In particular, in this embodiment of the present application, the first storage tank 13 is a solution storage tank, the first inlet valve 14 and the first outlet valve 12 correspond to the solution inlet and outlet valves of the solution storage tank, the second storage tank 16 is a refrigerant storage tank, and the second inlet valve 15 and the second outlet valve 17 correspond to the refrigerant inlet and outlet valves of the refrigerant storage tank.

[0078] It should be understood that the first storage tank 13 and the second storage tank 16 can be connected to any position in the circulating refrigerant pipeline of the combined cooling and heating unit 30, and the present application does not limit this. That is, the connecting pipeline of the concentration adjustment unit 10 and the combined cooling and heating unit 30 can be located at any position of the combined cooling and heating unit 30, as long as the height of the solution storage tank and the refrigerant liquid level tank in the concentration adjustment unit 10 can be changed, so that the adjustment of the system operating concentration of the combined cooling and heating unit system can be realized.

[0079] When the system operating condition changes, the system operating concentration needs to be adjusted accordingly. This mainly includes the following two cases:

[0080] (1) When the system operating condition changes in a small range within a day or a certain period of time, only the valve opening of the refrigerant intermediate throttle valve 35 and the refrigerant throttle valve 37 needs to be controlled to adjust the liquid level height of the refrigerant in the gas-liquid separator, so that the small-range adjustment of the system operating concentration can be realized. For an ammonia water system, when the liquid ammonia refrigerant level in the gas-liquid separator rises, the operating concentration of the refrigerant in the system decreases in a small range; when the liquid ammonia refrigerant level in the gas-liquid separator drops, the operating concentration of the refrigerant in the system increases in a small range.

[0081] (2) When the system operating condition varies greatly with seasons, the optimal concentration of the system working medium varies greatly, at this time the concentration adjustment unit can be used to adjust the concentration of the system. By adjusting the liquid level of the first storage tank 13 and the second storage tank 16, the operating concentration of the working medium in the system can be adjusted, and the charging amount of the working medium in the system can also be adjusted or maintained.

[0082] That is, the concentration adjustment of the circulating working medium of the absorption type combined cooling and heating system includes small range adjustment and large range adjustment. The absorption type combined cooling and heating system realizes small range adjustment of the concentration of the circulating working medium by adjusting the working medium liquid level of the gas-liquid separator 36, and realizes large range adjustment of the concentration of the circulating working medium and maintains the charging amount of the circulating working medium in the absorption type combined cooling and heating system by adjusting the liquid level of the first storage tank 13 and the second storage tank 16.

[0083] In particular, for the ammonia water system, the operating concentration of the system can be increased by increasing the liquid level of the dilute solution in the first storage tank 13 or reducing the height of the liquid ammonia in the second storage tank 16. Specifically, in the case that the heating unit 20 and the combined cooling and heating unit 30 are normally operated, the concentration adjustment unit heat source inlet valve 11, the first outlet valve 12, and the second inlet valve 15 should be kept closed, and the first inlet valve 14 and the second outlet valve 17 should be kept open. At this time, the generator 32 has a higher temperature and pressure, and by adjusting the first inlet valve 14 and the solution throttle valve 303, part of the dilute solution enters the first storage tank 13 to cause the liquid level to rise; by adjusting the opening degree of the second outlet valve 17 and the refrigerant throttle valve 37, part of the liquid ammonia working medium enters the gas-liquid separator 36 to cause the liquid level in the second storage tank 16 to drop. By reasonably controlling the volume of the dilute solution leaving the combined cooling and heating unit 30 and the volume of the liquid ammonia entering the combined cooling and heating unit 30, the concentration adjustment of the working medium can be realized while the charging amount of the working medium in the system is maintained stable within a reasonable range. Therefore, the absorption type combined cooling and heating system provided by the present application can realize the optimal adjustment of the charging amount of the circulating working medium in the system and the concentration of the circulating working medium in the system, and ensure the continuous and efficient operation of the system.

[0084] In particular, for the ammonia water system, the working concentration of the system can be reduced by lowering the liquid level of the dilute solution in the first storage tank 13 or raising the height of the liquid ammonia in the second storage tank 16. Specifically, in the case that the heating unit 20 and the combined cooling and heating unit 30 are normally operated, the concentration adjustment unit heat source inlet valve 11 and the first inlet valve 14 are closed. By adjusting the opening degrees of the refrigerant medium intermediate throttle valve 35, the second inlet valve 15, and the refrigerant medium throttle valve 37 and the second outlet valve 17, the liquid level of the second storage tank 16 can be raised. After the above process is completed, the second inlet valve 15 and the second outlet valve 17 are closed. The concentration adjustment unit heat source inlet valve 11 is opened, and the combined cooling and heating unit heat source inlet valve 31 and the first inlet valve 14 are closed. At this time, the heat source medium no longer enters the generator 32, and only the first storage tank 13 is heated, causing the temperature and pressure of the first storage tank 13 to gradually rise. When the pressure of the first storage tank 13 is higher than that of the generator 32, the first outlet valve 12 is opened and controlled, and the dilute solution enters the combined cooling and heating unit to meet the requirements.

[0085] Optionally, in some embodiments of the present application, the concentration adjustment unit 10 includes a solution pump connected to the first storage tank 13 and a liquid ammonia working medium pump connected to the second storage tank 16. The concentration adjustment unit 10 adjusts the liquid level of the first storage tank 13 through the solution pump, the first inlet valve 14, and the first outlet valve 12, and adjusts the liquid level of the second storage tank 16 through the liquid ammonia working medium pump, the second inlet valve 15, and the second outlet valve 17. That is, in some embodiments of the present application, the adjustment of the liquid levels of the first storage tank 13 and the second storage tank 16 can also be completed by the solution pump or the liquid ammonia working medium pump, and the present application does not limit this.

[0086] It is worth mentioning that the concentration adjustment unit 10 can be installed together with other units to form a complete system, which can instantly adjust the charging amount of the working medium in the system and the operating concentration of the working medium in the system.

[0087] The concentration adjustment unit 10 can also be separated from other units to become a separate unit, which is independent externally, so as to reduce the volume and investment cost of the combined cooling and heating equipment. When a large range of adjustment of the working concentration of the system is required, the concentration adjustment unit 10 can be transported to the combined cooling and heating unit 30 and connected thereto.

[0088] For example, the concentration adjusting unit 10 can be integrated with the combined cooling heating and power unit 30 to realize large-scale and instant adjustment of the system charge and operating concentration. Alternatively, the system can be transported in a split mode, and the concentration adjusting unit 10 can be transported by a skid-mounted transport vehicle to adjust the operating concentration, thereby reducing the size of the individual units.

[0089] It can be understood that the absorption combined cooling heating and power system adjusts the concentration of the circulating working medium in the entire system by controlling the liquid level of the first storage tank 13 and the second storage tank 16 of the concentration adjusting unit 10, thereby maintaining the charge of the circulating working medium in the entire system, optimizing the adjustment of the charge of the circulating working medium and the concentration of the circulating working medium in the system, and ensuring that the system can continuously and efficiently operate under different working conditions. The control method of the present application is simple, convenient, and easy to implement.

[0090] Embodiment 2

[0091] For reference Figure 2 The specific structure of the absorption combined cooling heating and power system provided by the second preferred embodiment of the present application is illustrated. Specifically, the absorption combined cooling heating and power system comprises a concentration adjusting unit 10, a heating unit 20, a combined cooling heating and power unit 30, and an end user unit 40. The combined cooling heating and power unit 30 is connected to the end user unit 40 through a cold carrier medium pipeline and a heat carrier medium pipeline, and is used to provide cold energy products and heat energy products to the end user unit 40 and to adjust the concentration of the circulating working medium in the absorption combined cooling heating and power system in a small range. The heating unit 20 is connected to the combined cooling heating and power unit 30 through a heat source pipeline, and is used to transfer heat energy to a heat source medium and to transfer the heat source medium to the combined cooling heating and power unit 30 through the heat source pipeline to provide energy for driving the combined cooling heating and power unit 30. The concentration adjusting unit 10 is connected to the combined cooling heating and power unit 30, and is used to adjust the concentration of the circulating working medium in the absorption combined cooling heating and power system in a large range when the working condition of the absorption combined cooling heating and power system changes greatly.

[0092] Specifically, the heating unit 20 is connected to the combined cooling heating and power unit 30 through a first heat source pipeline 51 and a second heat source pipeline 52 of the heat source pipeline. The combined cooling heating and power unit 30 is connected to the end user unit 40 through a first cold carrier medium pipeline 71 and a second cold carrier medium pipeline 72 of the cold carrier medium pipeline and a first heat carrier medium pipeline 73 and a second heat carrier medium pipeline 74 of the heat carrier medium pipeline. The combined cooling heating and power unit 30 is connected to the concentration adjusting unit 10 through a first pipeline 61 and a second pipeline 62 of the first pipeline group and a third pipeline 63 and a fourth pipeline 64 of the second pipeline group.

[0093] Further, the heating unit 20 comprises a heat energy collector 21 and a heat source medium circulating pump 22 connected to the heat energy collector 21. The heat energy collector 21 can be driven by one or more of biomass energy, solar energy, geothermal energy, fossil energy, hydrogen energy to generate heat energy, and the heat energy collector 21 can be driven by the above-mentioned energy sources in parallel, series or series-parallel form.

[0094] The embodiment takes fuel combustion to provide heat for the heat energy collector 21, as shown in the figure. Figure 2 The fuel and air F1 enter the heat energy collector 21 to complete combustion, and the heat energy generated by combustion is transferred to the heat source medium, which enters the cold-heat combined supply unit 30 through the first heat source pipeline 51. The flue gas F2 generated by combustion enters the intermediate evaporator 304 in the cold-heat combined supply unit 30 for recycling, and the flue gas temperature is reduced to become flue gas F3, which is discharged to the environment.

[0095] The cold-heat combined supply unit 30 in the embodiment takes an absorption system with an intermediate evaporation process as an example, but the concentration adjusting unit is not limited to being used in the absorption cold-heat combined supply, and can also be used in other single-stage absorption systems and their evolution systems, multi-stage absorption systems and their evolution systems, multi-effect absorption systems and their evolution systems, or other absorption systems. Any similar or identical concentration adjusting mechanism and adjusting scheme in the present application is within the protection scope of the present application.

[0096] Specifically, the cold-heat combined supply unit 30 comprises a cold-heat combined supply unit heat source inlet valve 31 connected to the first heat source pipeline 51 of the heat source pipeline, a generator 32 connected to the cold-heat combined supply unit heat source inlet valve 31, a rectifier 33 connected to the steam outlet of the generator 32, and a condenser 34, a refrigeration working medium intermediate throttling valve 35, an intermediate evaporator 304, the gas-liquid separator 36, a refrigeration working medium throttling valve 37, and an evaporator 38 connected to the rectifier 33 in sequence. The cold-heat combined supply unit 30 further comprises a solution intermediate throttling valve 306 connected to the generator 32, an intermediate absorber 307 connected to the solution intermediate throttling valve 306, a solution throttling valve 303 connected to the intermediate absorber 307, an absorber 39 connected to the solution throttling valve 303, and a first solution circulating pump 301 connected to the absorber 39 and the intermediate absorber 307.

[0097] Specifically, the working process of the absorption-based combined cooling and heating system is as follows: the heat source medium enters the generator 32 through the first heat source pipeline 51 and the combined cooling and heating unit heat source inlet valve 31 to complete heat exchange, and then returns to the heat energy collector 21 through the second heat source pipeline 52 of the heat source pipeline; the solution in the generator 32 completes the generation process with the heat source medium, and the dilute solution generated after the generation process enters the intermediate absorber 307 through the solution intermediate throttling valve 306; the refrigerant vapor generated in the generation process enters the rectifier 33 to complete the purification process, and then enters the condenser 34 to release condensation heat to become saturated liquid, and enters the intermediate evaporator 304 through the refrigerant intermediate throttling valve 35 to recover the heat in the flue gas generated by the heat energy collector 21; the refrigerant after recovering the heat enters the gas-liquid separator 36 for gas-liquid separation; the gas-phase working medium obtained by gas-liquid separation enters the intermediate absorber 307 to complete the intermediate absorption process and generate an intermediate concentration solution, which enters the absorber 39 through the solution throttling valve 303; the liquid-phase working medium obtained by gas-liquid separation enters the evaporator 38 through the refrigerant throttling valve 37 to complete the refrigeration process and provide cold energy products for the end user unit 40; the refrigerant after evaporation enters the absorber 39 and is absorbed by the solution in the absorber 39 to release absorption heat; the absorption heat released by the absorber 39 together with the condensation heat released by the condenser 34 provides heat energy products for the end user unit; and the solution after completing the absorption process returns to the generator through the first solution circulating pump 301 and the intermediate absorber 307, thereby completing the working medium circulation process of the absorption-based combined cooling and heating system.

[0098] Since the optimal circulating working concentration of the system is affected by the ambient temperature, the optimal working concentration of the system will have a huge difference in different seasons, different times, and different climates. The adjustment of the system operating concentration is described clearly and completely below, and the present embodiment takes ammonia water solution as an example to introduce the circulating working medium of the system. However, the circulating working medium of the present application is not limited to ammonia water working medium, but also includes lithium bromide aqueous solution, ammonia salt solution, ionic solution, and multi-component mixed solution composed of the above-mentioned solutions.

[0099] Further, the concentration adjusting unit 10 comprises a first outlet valve 12, a first storage tank 13, a first inlet valve 14, a second inlet valve 15, a second storage tank 16, a second outlet valve 17 and a second solution circulating pump 18, wherein the second solution circulating pump 18 is connected to one end of the first storage tank 13 and to the first outlet valve 12, that is, the second solution circulating pump 18 is connected between the first storage tank 13 and the first outlet valve 12; the first outlet valve 12 is connected to the generator 32 through a second pipeline 62, the first inlet valve 14 is connected to one end of the first storage tank 13 and to the generator 32 through the first pipeline 61, the second inlet valve 15 is connected to one end of the second storage tank 16 and to the inlet pipeline of the refrigerant medium intermediate throttling valve 35 through a third pipeline 63, and the second outlet valve 17 is connected to the other end of the second storage tank 16 and to the inlet pipeline of the refrigerant medium throttling valve 37 through a fourth pipeline 64.

[0100] In particular, in this embodiment of the present application, the first storage tank 13 is a solution storage tank, the first inlet valve 14 and the first outlet valve 12 correspond to the solution inlet and outlet valves of the solution storage tank, the second storage tank 16 is a refrigerant medium storage tank, and the second inlet valve 15 and the second outlet valve 17 correspond to the refrigerant medium inlet and outlet valves of the refrigerant medium storage tank.

[0101] It should be understood that the first storage tank 13 and the second storage tank 16 can be connected to any position in the circulating refrigerant pipeline of the combined cooling and heating unit 30, and the present application does not limit this. That is, the connecting pipeline of the concentration adjusting unit 10 and the combined cooling and heating unit 30 can be located at any position of the combined cooling and heating unit 30, as long as the height of the solution storage tank and the refrigerant medium storage tank in the concentration adjusting unit 10 can be changed, so that the adjustment of the system operating concentration of the combined cooling and heating unit system can be realized.

[0102] When the system operating condition changes, the system operating concentration needs to be adjusted accordingly. This mainly includes the following two cases:

[0103] (1) When the system operating condition changes in a small range within a day or a certain period of time, only the valve opening degree of the refrigerant medium intermediate throttling valve 35 and the refrigerant medium throttling valve 37 needs to be controlled to adjust the liquid level height of the refrigerant medium in the vapor-liquid separator, so that the small-range adjustment of the system operating concentration can be realized. For an ammonia water system, when the liquid ammonia refrigerant level in the vapor-liquid separator rises, the operating concentration of the refrigerant in the system decreases in a small range; when the liquid ammonia refrigerant level in the vapor-liquid separator drops, the operating concentration of the refrigerant in the system increases in a small range.

[0104] (2) When the system working condition varies greatly with the season, the optimal concentration of the system working medium varies greatly, at this time the concentration adjustment unit can complete the concentration adjustment of the system. By adjusting the liquid level height of the first storage tank 13 and the second storage tank 16, the operating concentration of the working medium in the system can be adjusted, and the charging amount of the working medium in the system can also be adjusted or maintained.

[0105] That is, the concentration adjustment of the circulating working medium of the absorption type combined cooling and heating system includes small range adjustment and large range adjustment. The absorption type combined cooling and heating system realizes small range adjustment of the concentration of the circulating working medium by adjusting the working medium liquid level height of the gas-liquid separator 36, and realizes large range adjustment of the concentration of the circulating working medium and maintains the charging amount of the circulating working medium in the absorption type combined cooling and heating system by adjusting the liquid level height of the first storage tank 13 and the second storage tank 16.

[0106] In particular, for the ammonia water system, the operating concentration of the system can be increased by increasing the liquid level height of the dilute solution in the first storage tank 13 or reducing the height of the liquid ammonia in the second storage tank 16. Specifically, in the case that the heating unit 20 and the combined cooling and heating unit 30 are normally operated, the first outlet valve 12 and the second inlet valve 15 should be kept closed, and the first inlet valve 14 and the second outlet valve 17 should be kept open. At this time, the generator 32 has a higher temperature and pressure, and by adjusting the first inlet valve 14 and the solution intermediate throttle valve 306, part of the dilute solution enters the first storage tank 13, causing the liquid level to rise; by adjusting the opening degree of the second outlet valve 17 and the refrigerant throttle valve 37, part of the liquid ammonia working medium enters the gas-liquid separator 36, causing the liquid level in the second storage tank 16 to drop. By reasonably controlling the volume of dilute solution leaving the combined cooling and heating unit and the volume of liquid ammonia entering the combined cooling and heating unit, the concentration adjustment of the system can be realized, and the working medium charging amount in the system can be maintained stable within a reasonable range.

[0107] In particular, for the ammonia water system, the operating concentration of the system can be increased by increasing the liquid level height of the dilute solution in the first storage tank 13 or reducing the height of the liquid ammonia in the second storage tank 16. Specifically, in the case that the heating unit 20 and the combined cooling and heating unit 30 are normally operated, the first outlet valve 12 and the second inlet valve 15 should be kept closed, and the first inlet valve 14 and the second outlet valve 17 should be kept open. At this time, the generator 32 has a higher temperature and pressure, and by adjusting the first inlet valve 14 and the solution intermediate throttle valve 306, part of the dilute solution enters the first storage tank 13, causing the liquid level to rise; by adjusting the opening degree of the second outlet valve 17 and the refrigerant throttle valve 37, part of the liquid ammonia working medium enters the gas-liquid separator 36, causing the liquid level in the second storage tank 16 to drop. By reasonably controlling the volume of dilute solution leaving the combined cooling and heating unit and the volume of liquid ammonia entering the combined cooling and heating unit, the concentration adjustment of the system can be realized, and the working medium charging amount in the system can be maintained stable within a reasonable range.

[0108] Optionally, in some embodiments of the present application, the concentration adjustment unit 10 comprises a solution pump connected to the first storage tank 13 and a liquid ammonia working medium pump connected to the second storage tank 16, the concentration adjustment unit 10 adjusts the liquid level of the first storage tank 13 through the solution pump, the first inlet valve 14 and the first outlet valve 12 and adjusts the liquid level of the second storage tank 16 through the liquid ammonia working medium pump, the second inlet valve 15 and the second outlet valve 17, that is, in some embodiments of the present application, the adjustment of the liquid level in the first storage tank 13 and the second storage tank 16 can also be completed by the solution pump or the liquid ammonia working medium pump, and the present application does not limit this.

[0109] It is worth mentioning that the concentration adjustment unit 10 can be installed together with other units to form a complete system, which can immediately adjust the charging amount of the working medium in the system and the operating concentration of the working medium in the system.

[0110] The concentration adjustment unit 10 can also be separated from other units and become a split unit to stand alone externally to reduce the volume and investment cost of the combined cooling heating and power system. When a large range adjustment of the operating concentration of the working medium in the system is needed, the concentration adjustment unit 10 can be transported to the combined cooling heating and power unit 30 and connected thereto.

[0111] For example, the concentration adjustment unit 10 can be integrated with the combined cooling heating and power unit 30 to achieve large range and immediate adjustment of the charging amount and the operating concentration of the system. Split type skid-mounted transportation can also be used to adjust the operating concentration by using a skid-mounted transportation vehicle to adjust the concentration of the system, thereby reducing the volume of the single unit of the device.

[0112] It can be understood that the absorption combined cooling heating and power system adjusts the concentration of the circulating working medium of the entire system by controlling the liquid level of the first storage tank 13 and the second storage tank 16 of the concentration adjustment unit 10, thereby maintaining the charging amount of the circulating working medium in the entire system, taking into account the optimization adjustment of the charging amount of the circulating working medium in the system and the concentration of the circulating working medium in the system, and ensuring that the system can continuously and efficiently and stably operate under different working conditions. The control method of the present application is simple, convenient and easy to implement.

[0113] Embodiment 3

[0114] Please refer to Figure 3The specific structure of the absorption combined cooling and heating system according to the third preferred embodiment of the present invention is explained. Specifically, the absorption combined cooling and heating system includes a concentration adjustment unit 10, a heating unit 20, a combined cooling and heating unit 30, and an end-user unit 40. The combined cooling and heating unit 30 is connected to the end-user unit 40 through a cooling medium pipeline and a heating medium pipeline, and is used to provide the end-user unit 40 with cooling and heating products, and to adjust the concentration of the circulating working fluid of the absorption combined cooling and heating system within a small range. The heating unit 20 is connected to the combined cooling and heating unit 30 through a heat source pipeline, and is used to transfer heat energy to the heat source medium, and to transfer the heat source medium to the combined cooling and heating unit 30 through the heat source pipeline, so as to provide energy drive for the combined cooling and heating unit 30. The concentration adjustment unit 10 is connected to the combined cooling and heating unit 30, and is used to adjust the concentration of the circulating working fluid of the absorption combined cooling and heating system within a large range when the operating conditions of the absorption combined cooling and heating system vary greatly.

[0115] Specifically, the heating unit 20 is connected to the combined cooling and heating unit 30 via the first heat source pipe 51 and the second heat source pipe 52 of the heat source pipeline. The combined cooling and heating unit 30 is connected to the end user unit 40 via the first cooling medium pipe 71 and the second cooling medium pipe 72 of the cooling medium pipeline, and the first heat transfer medium pipe 73 and the second heat transfer medium pipe 74 of the heat transfer medium pipeline. The combined cooling and heating unit 30 is connected to the concentration adjustment unit 10 via the first pipe 61 and the second pipe 62 of the first pipeline group, and the third pipe 63 and the fourth pipe 64 of the second pipeline group.

[0116] Furthermore, the heating unit 20 includes a heat collector 21 and a heat source medium circulation pump 22 connected to the heat collector 21. The heat collector 21 can utilize one or more energy sources selected from biomass energy, solar energy, geothermal energy, fossil energy, and hydrogen energy to generate heat energy, and the heat collector 21 can be driven by the aforementioned heat-generating energy sources in parallel, series, or series-parallel configurations.

[0117] In this embodiment, fuel combustion provides heat to the heat collector 21, such as... Figure 3 As shown, fuel and air F1 enter the heat collector 21 for combustion, and the heat generated by combustion is transferred to the heat source medium. The heat source medium enters the combined cooling and heating unit 30 through the first heat source pipe 51. The flue gas F2 generated by combustion enters the intermediate evaporator 304 in the combined cooling and heating unit 30 for recycling. After the flue gas temperature decreases and it becomes flue gas F3, it is discharged into the environment.

[0118] The cold-heat combined supply unit 30 described in the embodiment takes an absorption system with an intermediate evaporation process as an example, but the concentration adjusting unit is not limited to use in a single-stage absorption cold-heat combined supply, and can also be used in other single-stage absorption systems and their evolutions, multi-stage absorption systems and their evolutions, multi-effect absorption systems and their evolutions, or other absorption systems. Any system similar or identical to the concentration adjusting mechanism and adjusting scheme in the present application is within the protection scope of the present application.

[0119] Specifically, the cold-heat combined supply unit 30 includes a cold-heat combined supply unit heat source inlet valve 31 connected to a first heat source pipeline 51 of the heat source pipeline, a generator 32 connected to the cold-heat combined supply unit heat source inlet valve 31, a rectifier 33 connected to a steam outlet of the generator 32, and a condenser 34, a refrigerant intermediate throttling valve 35, an intermediate evaporator 304, the gas-liquid separator 36, a refrigerant throttling valve 37, and an evaporator 38 connected to the rectifier 33 in sequence, and the cold-heat combined supply unit 30 further includes a low-position liquid discharge valve 308 and a solution intermediate throttling valve 306 connected to the generator 32, an intermediate absorber 307 connected to the solution intermediate throttling valve 306, a solution throttling valve 303 connected to the intermediate absorber 307, an absorber 39 connected to the solution throttling valve 303, and a first solution circulating pump 301 connected to the absorber 39 and the intermediate absorber 307.

[0120] Specifically, the working process of the absorption type combined cooling and heating system is as follows: the heat source medium enters the generator 32 through the first heat source pipeline 51 and the combined cooling and heating unit heat source inlet valve 31 to complete heat exchange, and then returns to the heat energy collector 21 through the second heat source pipeline 52 of the heat source pipeline; the solution in the generator 32 completes the generation process with the heat source medium, and the dilute solution generated after the generation process enters the intermediate absorber 307 through the solution intermediate throttling valve 306, the refrigerant vapor generated in the generation process enters the rectifier 33 to complete the purification process, and then enters the condenser 34 to release condensation heat to become saturated liquid, and then enters the intermediate evaporator 304 through the refrigerant intermediate throttling valve 35 to recover the heat in the flue gas generated by the heat energy collector 21, the refrigerant after recovering the heat enters the gas-liquid separator 36 to separate the gas and liquid, the gas-phase working medium obtained by gas-liquid separation enters the intermediate absorber 307 to complete the absorption process and generate an intermediate concentration solution, the intermediate concentration solution enters the absorber 39 through the solution throttling valve 303, the liquid-phase working medium obtained by gas-liquid separation enters the evaporator 38 through the refrigerant throttling valve 37 to complete the refrigeration process and provide cold energy products for the end user unit 40, and the refrigerant after evaporation enters the absorber 39 and is absorbed by the solution in the absorber 39 to release absorption heat, the absorption heat released by the absorber 39 together with the condensation heat released by the condenser 34 provides heat energy products for the end user unit, and the solution after completing the absorption process returns to the generator through the first solution circulating pump 301 and the intermediate absorber 307, thereby completing the working medium circulation process of the absorption type combined cooling and heating system.

[0121] Since the optimal circulating working concentration of the system is affected by the ambient temperature, the optimal working concentration of the system will have a huge difference in different seasons, different times and different climates. The adjustment of the system operating concentration is described in detail below, and the present embodiment takes ammonia water solution as an example to introduce the circulating working medium of the system. However, the circulating working medium of the present application is not limited to ammonia water working medium, but also includes lithium bromide aqueous solution, ammonia salt solution, ionic solution and multi-component mixed solution composed of the above solutions.

[0122] Further, the concentration adjusting unit 10 comprises a first outlet valve 12, a first storage tank 13, a first inlet valve 14, a second inlet valve 15, a second storage tank 16 and a second outlet valve 17, wherein the first outlet valve 12 and the first inlet valve 14 are connected to two ends of the first storage tank 13 respectively, the first outlet valve 12 is connected to the generator 32 through a second pipeline 62, the first inlet valve 14 is connected to the low-position liquid discharge valve 308 through the first pipeline 61, the second inlet valve 15 and the second outlet valve 17 are connected to two ends of the second storage tank 16 respectively, the second inlet valve 15 is connected to the low-position liquid discharge valve 308 through a third pipeline 63, and the second outlet valve 17 is connected to the absorber 39 through a fourth pipeline 64.

[0123] In particular, in this embodiment of the application, the first storage tank 13 and the second storage tank 16 are both solution storage tanks, the first storage tank is used for storing a dilute solution, and the second storage tank is used for storing a concentrated solution.

[0124] It should be understood that the first storage tank 13 and the second storage tank 16 can be connected to any position in the circulating working medium pipeline of the combined cooling and heating unit 30, and the application does not limit this. That is, the connecting pipeline of the concentration adjusting unit 10 and the combined cooling and heating unit 30 can be located at any position of the combined cooling and heating unit 30, as long as the height of the solution storage tank and the working medium liquid level tank in the concentration adjusting unit 10 can be changed, so that the adjustment of the system running concentration of the combined cooling and heating unit system can be realized.

[0125] It should also be understood that the low-position liquid discharge valve 308 can be arranged at the lowest position of the absorption combined cooling and heating system, and the application does not limit the specific position of the low-position liquid discharge valve 308.

[0126] When the system running condition changes, the system running concentration needs to be adjusted accordingly. This mainly includes the following two cases:

[0127] (1) When the system condition changes in a small range within a day or a certain period of time, only the valve opening of the refrigerant intermediate throttling valve 35 and the refrigerant throttling valve 37 needs to be controlled to adjust the liquid level height of the refrigerant in the vapor-liquid separator, so that the small-range adjustment of the system running concentration can be realized. For an ammonia water system, when the liquid ammonia working medium level in the vapor-liquid separator rises, the running concentration of the working medium in the system decreases in a small range; when the liquid ammonia working medium level in the vapor-liquid separator drops, the running concentration of the working medium in the system increases in a small range.

[0128] (2) When the system working condition varies greatly with seasons, the optimal concentration of the system working medium varies greatly, and the solution in the combined cooling and heating unit 30 is directly replaced by the concentration adjusting unit 10.

[0129] That is, the concentration adjustment of the circulating working medium of the absorption combined cooling and heating system includes small-range adjustment and large-range adjustment. The absorption combined cooling and heating system realizes the small-range adjustment of the concentration of the circulating working medium by adjusting the liquid level of the working medium of the gas-liquid separator 36, and realizes the large-range adjustment of the concentration of the circulating working medium and maintains the charging amount of the circulating working medium in the absorption combined cooling and heating system by adjusting the liquid level of the first storage tank 13 and the second storage tank 16.

[0130] In particular, for the ammonia water system, the first storage tank 13 is used to store low-concentration solution for winter heating. The second storage tank 16 is used to store high-concentration solution for summer cooling. When the combined cooling and heating unit 30 needs high-concentration solution, the first storage tank 13 is first vacuumed, the first outlet valve 12 is closed, the low-position liquid discharge valve 308 and the first inlet valve 14 are opened, and the solution in the combined cooling and heating unit is directly discharged into the first storage tank 13 through the low-position liquid discharge valve 308, so that the liquid level in the first storage tank 13 is raised. After the solution in the combined cooling and heating unit 30 is emptied, the combined cooling and heating unit 30 is vacuumed, then the second inlet valve 15 is closed and the second outlet valve 17 is opened, so that the concentrated solution in the second storage tank 16 is charged into the combined cooling and heating unit 30, so that the liquid level in the second storage tank 16 is lowered, thereby completing the replacement of the working medium and the adjustment of the concentration.

[0131] It can be understood that, by adjusting the liquid levels of the first storage tank 13 and the second storage tank 16, the system can not only adjust the concentration of the circulating working medium in a large range, but also ensure that the charging amount of the circulating working medium of the system remains stable, thereby ensuring the continuous and efficient stable operation of the system.

[0132] Particularly, when the cold heat supply unit 30 needs low concentration solution, first, the second storage tank 16 is vacuumized, the second outlet valve 17 is closed, the low liquid discharge valve 308 and the second inlet valve 15 are opened, so that the concentrated solution in the cold heat supply unit 30 is directly discharged into the second storage tank 16 through the low liquid discharge valve 308, thereby increasing the liquid level of the second storage tank 16. After the solution in the cold heat supply unit is emptied, the cold heat supply unit 30 is vacuumized, then the first inlet valve 14 and the low liquid discharge valve 308 are closed, and the first outlet valve 12 is opened, so that the dilute solution in the first storage tank 13 is filled into the cold heat supply unit 30, thereby decreasing the liquid level of the first storage tank 13, completing the working medium replacement and concentration adjustment.

[0133] Optionally, in some embodiments of the present application, the concentration adjustment unit 10 comprises a solution pump connected to the first storage tank 13 and an ammonia working medium pump connected to the second storage tank 16, the concentration adjustment unit 10 adjusts the liquid level of the first storage tank 13 through the solution pump, the first inlet valve 14 and the first outlet valve 12, and adjusts the liquid level of the second storage tank 16 through the ammonia working medium pump, the second inlet valve 15 and the second outlet valve 17, that is, in some embodiments of the present application, the adjustment of the liquid level of the first storage tank 13 and the second storage tank 16 can also be completed by the solution pump or the ammonia working medium pump, and the present application does not limit this.

[0134] It is worth mentioning that the concentration adjustment unit 10 can be installed together with other units to form a complete system, which can instantly adjust the charging amount of the working medium in the system and the operating concentration of the working medium in the system.

[0135] The concentration adjustment unit 10 can also be separated from other units to become a split unit and be independent externally, so as to reduce the volume and investment cost of the cold heat supply equipment. When a wide range of adjustment of the operating concentration of the working medium in the system is needed, the concentration adjustment unit 10 can be transported to the cold heat supply unit 30 and connected thereto.

[0136] For example, the concentration adjustment unit 10 can be integrated with the cold heat supply unit 30 to achieve large-scale and instant adjustment of the charging amount and operating concentration of the system. Split type skid-mounted transportation can also be used, and the system concentration adjustment is performed by a skid-mounted transportation vehicle when the operating concentration needs to be adjusted, thereby reducing the monomer volume of the equipment.

[0137] It can be understood that the absorption type cold and heat combined supply system realizes the replacement of the solution between the first storage tank 13 and the second storage tank 16 and the cold and heat combined supply unit 30 by controlling the corresponding valves to adjust the liquid level of the first storage tank 13 and the second storage tank 16 of the concentration adjusting unit 10, so as to realize the adjustment of the concentration of the circulating working medium of the whole system, maintain the filling amount of the circulating working medium in the whole system, give consideration to the optimization adjustment of the filling amount and the concentration of the circulating working medium in the system, and ensure that the system can continuously and efficiently and stably operate under different working conditions. The control mode of the present application is simple, convenient and easy to realize.

[0138] The technical features of the above embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described, but it should be considered that any combination of the technical features is within the scope of the present disclosure as long as the combination does not result in contradictions.

[0139] The above embodiments only express the preferred embodiments of the present application, which are described in detail, but should not be construed as limiting the scope of the patent. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the scope of the patent protection of the present application should be subject to the appended claims.

Claims

1. An absorption-based combined cooling and heating system, characterized by, Comprise: an end user unit; a combined cooling and heating unit connected to the end user unit through a cold carrier medium pipeline and a heat carrier medium pipeline, for providing cold energy products and heat energy products to the end user unit, and for small-scale adjustment of the concentration of circulating working medium in the absorption combined cooling and heating system; a heating unit connected to the combined cooling and heating unit through a heat source pipeline, for transferring heat energy to a heat source medium, and transferring the heat source medium to the combined cooling and heating unit through the heat source pipeline, to provide energy drive for the combined cooling and heating unit; and a concentration adjustment unit connected to the combined cooling and heating unit, for large-scale adjustment of the concentration of circulating working medium in the absorption combined cooling and heating system when the working condition of the absorption combined cooling and heating system changes greatly. The concentration adjustment unit comprises a first storage tank connected to the combined cooling and heating unit through a first pipeline group, and a second storage tank connected to the combined cooling and heating unit through a second pipeline group, the combined cooling and heating unit comprises a gas-liquid separator, the absorption combined cooling and heating system adjusts the liquid level of the gas-liquid separator to achieve small-scale adjustment of the concentration of circulating working medium, and adjusts the liquid level of the first storage tank and the second storage tank to achieve large-scale adjustment of the concentration of circulating working medium and maintain the charge amount of circulating working medium in the absorption combined cooling and heating system. The combined cooling and heating unit increases the liquid level in the gas-liquid separator to reduce the concentration of circulating working medium in the absorption combined cooling and heating system, and reduces the working medium liquid level in the gas-liquid separator to increase the concentration of circulating working medium in the absorption combined cooling and heating system, thereby achieving small-scale adjustment of the concentration of circulating working medium; the concentration adjustment unit increases the liquid level of the first storage tank and reduces the liquid level of the second storage tank to increase the concentration of circulating working medium in the absorption combined cooling and heating system, and reduces the liquid level of the first storage tank and increases the liquid level of the second storage tank to reduce the concentration of circulating working medium in the absorption combined cooling and heating system, thereby achieving large-scale adjustment of the concentration of circulating working medium.

2. The absorption chiller-heat pump system of claim 1, wherein, The concentration adjustment unit further comprises a first inlet valve and a first outlet valve connected to both ends of the first storage tank, and a second inlet valve and a second outlet valve connected to both ends of the second storage tank, the first pipeline group comprises a first pipeline and a second pipeline, the second pipeline group comprises a third pipeline and a fourth pipeline, the first inlet valve is connected to the combined cooling and heating unit through the first pipeline, the first outlet valve is connected to the combined cooling and heating unit through the second pipeline, the second inlet valve is connected to the combined cooling and heating unit through the third pipeline, and the second outlet valve is connected to the combined cooling and heating unit through the fourth pipeline, the concentration adjustment unit adjusts the liquid level of the first storage tank by controlling the first inlet valve and the first outlet valve, and adjusts the liquid level of the second storage tank by controlling the second inlet valve and the second outlet valve, thereby achieving large-scale adjustment of the concentration of circulating working medium.

3. The absorption chiller-heat pump system of claim 2, wherein, ​ 4. The absorption chiller-heat pump system of claim 3, wherein, The first storage tank is a solution storage tank, the second storage tank is a working medium storage tank, the concentration adjusting unit comprises a solution pump connected to the first storage tank and a liquid ammonia working medium pump connected to the second storage tank, the concentration adjusting unit adjusts the liquid level height of the first storage tank through the solution pump, the first inlet valve and the first outlet valve, and adjusts the liquid level height of the second storage tank through the liquid ammonia working medium pump, the second inlet valve and the second outlet valve.

5. The absorption chiller-heat system of claim 3, wherein, The heat and cold combined unit comprises a heat and cold combined unit heat source inlet valve connected to the first heat source pipeline of the heat source pipeline, a generator connected to the heat and cold combined unit heat source inlet valve, a rectifier connected to the steam outlet of the generator, and a condenser connected to the rectifier, a refrigeration working medium intermediate throttle valve, the gas-liquid separator, a refrigeration working medium throttle valve and an evaporator connected to the rectifier in sequence, the heat and cold combined unit further comprises a solution heat exchanger connected to the generator, a solution throttle valve connected to the solution heat exchanger, an absorber connected to the solution throttle valve, and a first solution circulating pump connected to the absorber and the solution heat exchanger, wherein, The heat source medium of the heating unit enters the generator through the first heat source pipeline and the heat and cold combined unit heat source inlet valve to complete heat exchange, and then returns to the heating unit through the second heat source pipeline of the heat source pipeline; the solution in the generator completes the generation process with the heat source medium, the dilute solution generated after the generation process enters the absorber after passing through the solution heat exchanger and the solution throttle valve in sequence, the refrigeration working medium vapor generated in the generation process enters the rectifier to complete the purification process, then enters the condenser to release condensation heat to become saturated liquid, and then enters the gas-liquid separator through the refrigeration working medium intermediate throttle valve to separate gas and liquid, the liquid phase working medium obtained by gas-liquid separation enters the evaporator through the refrigeration working medium throttle valve to complete the refrigeration process, and provides cold energy products for the end user unit, the refrigeration working medium after completing the evaporation enters the absorber and is absorbed by the solution in the absorber to release absorption heat, the absorption heat released by the absorber together with the condensation heat released by the condenser provides heat energy products for the end user unit, and the solution after completing the absorption process returns to the generator through the first solution circulating pump and the solution heat exchanger, thereby completing the working medium circulation process of the absorption type cold and heat combined unit.

6. The absorption chiller-heat pump system of claim 5, wherein, The first storage tank is a solution storage tank, the second storage tank is a working medium storage tank, the concentration adjusting unit further comprises a concentration adjusting unit heat source inlet valve connected to the first storage tank and the heating unit, the first inlet valve is connected to the outlet pipeline of the generator through the first pipeline, the first outlet valve is connected to the generator through the second pipeline, the second inlet valve is connected to the inlet pipeline of the refrigeration working medium intermediate throttle valve through the third pipeline, and the second outlet valve is connected to the gas-liquid separator through the fourth pipeline, wherein, The absorption type combined cooling and heating system adjusts the liquid level of the refrigerant in the gas-liquid separator by controlling the opening degree of the refrigerant intermediate throttle valve and the refrigerant throttle valve, so as to realize small range adjustment of the concentration of the circulating working medium, and adjusts the liquid level of the solution storage tank and the working medium storage tank by controlling the opening degree of the combined cooling and heating unit heat source inlet valve, the concentration adjustment unit heat source inlet valve, the first outlet valve, the first inlet valve, the second inlet valve, the second outlet valve, the refrigerant intermediate throttle valve, the refrigerant throttle valve and the solution throttle valve, so as to realize large range adjustment of the concentration of the circulating working medium.

7. The absorption chiller-heat system of claim 3, wherein, The combined cooling and heating unit comprises a combined cooling and heating unit heat source inlet valve connected to the first heat source pipeline of the heat source pipeline, a generator connected to the combined cooling and heating unit heat source inlet valve, a rectifier connected to the steam outlet of the generator, and a condenser, a refrigerant intermediate throttle valve, an intermediate evaporator, the gas-liquid separator, a refrigerant throttle valve and an evaporator connected to the rectifier in sequence, and the combined cooling and heating unit further comprises a solution intermediate throttle valve connected to the generator, an intermediate absorber connected to the solution intermediate throttle valve, a solution throttle valve connected to the intermediate absorber, an absorber connected to the solution throttle valve, and a first solution circulating pump connected to the absorber and the intermediate absorber, wherein, The heat source medium enters the generator through the first heat source pipeline and the combined cooling and heating unit heat source inlet valve to complete heat exchange, and then returns to the heating unit through the second heat source pipeline of the heat source pipeline; the solution in the generator completes the generation process with the heat source medium, and the dilute solution generated after the generation process enters the intermediate absorber through the solution intermediate throttle valve; the refrigerant vapor generated in the generation process enters the rectifier to complete the purification process, and then enters the condenser to release condensation heat to become saturated liquid, and then enters the intermediate evaporator through the refrigerant intermediate throttle valve to recover the heat in the flue gas generated by the heating unit; the refrigerant after recovering the heat enters the gas-liquid separator for gas-liquid separation, wherein the gas phase working medium obtained by gas-liquid separation enters the intermediate absorber to complete the intermediate absorption process and generate an intermediate concentration solution, and the intermediate concentration solution enters the absorber through the solution throttle valve; the liquid phase working medium obtained by gas-liquid separation enters the evaporator through the refrigerant throttle valve to complete the refrigeration process and provide cold energy products for the end user unit; the refrigerant after completing the evaporation enters the absorber and is absorbed by the solution in the absorber to release absorption heat; the absorption heat released by the absorber and the condensation heat released by the condenser provide heat energy products for the end user unit; the solution after completing the absorption process returns to the generator through the first solution circulating pump and the intermediate absorber, thereby completing the working medium circulation process of the absorption type combined cooling and heating system.

8. The absorption chiller-heat pump system of claim 7, wherein, The first tank is a solution tank, the second tank is a working medium tank, the concentration adjusting unit further comprises a second solution circulating pump connected between the first tank and the first outlet valve, the first inlet valve is connected to the generator through the first pipeline, the first outlet valve is connected to the generator through the second pipeline, the second inlet valve is connected to the inlet pipeline of the refrigerant working medium intermediate throttle valve through the third pipeline, the second outlet valve is connected to the inlet pipeline of the refrigerant working medium throttle valve through the fourth pipeline, and the second outlet valve is connected to the inlet pipeline of the refrigerant working medium throttle valve through the fourth pipeline, wherein The absorption heat and cold combined supply system adjusts the liquid level height of the refrigerant working medium in the gas-liquid separator by controlling the opening degrees of the refrigerant working medium intermediate throttle valve and the refrigerant working medium throttle valve, so as to realize small-range adjustment of the concentration of the circulating working medium, and adjusts the liquid level heights of the solution tank and the working medium tank by the second solution circulating pump and by controlling the opening degrees of the first outlet valve, the first inlet valve, the second inlet valve, the second outlet valve, the refrigerant working medium intermediate throttle valve, the refrigerant working medium throttle valve and the solution intermediate throttle valve, so as to realize large-range adjustment of the concentration of the circulating working medium.

9. The absorption chiller-heat pump system of claim 3, wherein, The heat and cold combined supply unit comprises a heat and cold combined supply unit heat source inlet valve connected to the first heat source pipeline of the heat source pipeline, a generator connected to the heat and cold combined supply unit heat source inlet valve, a rectifier connected to the vapor outlet of the generator, and a condenser, a refrigerant working medium intermediate throttle valve, an intermediate evaporator, the gas-liquid separator, a refrigerant working medium throttle valve and an evaporator connected in sequence to the rectifier, the heat and cold combined supply unit further comprises a low-position liquid discharge valve and a solution intermediate throttle valve connected to the generator, an intermediate absorber connected to the solution intermediate throttle valve, a solution throttle valve connected to the intermediate absorber, an absorber connected to the solution throttle valve, and a first solution circulating pump connected to the absorber and the intermediate absorber, wherein The absorption heat and cold combined supply system adjusts the liquid level height of the refrigerant working medium in the gas-liquid separator by controlling the opening degrees of the refrigerant working medium intermediate throttle valve and the refrigerant working medium throttle valve, so as to realize small-range adjustment of the concentration of the circulating working medium, and adjusts the liquid level heights of the solution tank and the working medium tank by the second solution circulating pump and by controlling the opening degrees of the first outlet valve, the first inlet valve, the second inlet valve, the second outlet valve, the refrigerant working medium intermediate throttle valve, the refrigerant working medium throttle valve and the solution intermediate throttle valve, so as to realize large-range adjustment of the concentration of the circulating working medium. The heat source medium enters the generator through the first heat source pipeline and the cold and heat combined unit heat source import valve to complete heat exchange, and then returns to the heating unit through the second heat source pipeline of the heat source pipeline; the solution in the generator completes the generation process with the heat source medium, and the dilute solution produced after the generation process enters the intermediate absorber through the solution intermediate throttling valve; the refrigerant vapor produced in the generation process enters the rectifier to complete the purification process, and then enters the condenser to release condensation heat to become saturated liquid, and then enters the intermediate evaporator through the refrigerant intermediate throttling valve to recover the heat in the flue gas generated by the heating unit; the refrigerant after recovering the heat enters the gas-liquid separator for gas-liquid separation, the gas-phase working medium obtained by gas-liquid separation enters the intermediate absorber to complete the absorption process and produce an intermediate concentration solution, the intermediate concentration solution enters the absorber through the solution throttling valve, the liquid-phase working medium obtained by gas-liquid separation enters the evaporator through the refrigerant throttling valve to complete the refrigeration process and provide cold energy products for the end user unit, and the refrigerant after evaporation enters the absorber and is absorbed by the solution in the absorber to release absorption heat, the absorption heat released by the absorber together with the condensation heat released by the condenser provides heat energy products for the end user unit, and the solution after completing the absorption process returns to the generator through the first solution circulating pump and the intermediate absorber, thereby completing the working medium circulation process of the absorption type cold and heat combined supply system.

10. The absorption chiller-heat pump system of claim 9, wherein, The first storage tank and the second storage tank are both solution storage tanks, the first import valve is connected to the low-position liquid discharge valve through the first pipeline, the first export valve is connected to the generator through the second pipeline, the second import valve is connected to the low-position liquid discharge valve through the third pipeline, and the second export valve is connected to the absorber through the fourth pipeline, wherein, The absorption type cold and heat combined supply system adjusts the liquid level height of the refrigerant in the gas-liquid separator by controlling the opening degrees of the refrigerant intermediate throttling valve and the refrigerant throttling valve, thereby realizing small-range adjustment of the concentration of the circulating working medium; the absorption type cold and heat combined supply system realizes solution replacement between the first storage tank, the second storage tank and the cold and heat combined unit by vacuumizing the first storage tank, the second storage tank and the cold and heat combined unit and by controlling the opening degrees of the first import valve, the first export valve, the second import valve, the second export valve and the low-position liquid discharge valve, thereby realizing large-range adjustment of the concentration of the circulating working medium.

11. The absorption chiller-heat supply system according to any one of claims 1 to 10, wherein, The heating unit comprises a heat energy collector and a heat source medium circulating pump connected to the heat energy collector, the heat energy collector is used to drive heat energy generation in series or in parallel or in series-parallel form by using one or more of biomass energy, solar energy, geothermal energy, fossil energy and hydrogen energy, and to transfer the heat energy to the heat source medium, and the heat source medium is input into the cold and heat combined unit through the heat source medium circulating pump and the first heat source pipeline of the heat source pipeline.

12. The absorption chiller-heat pump system of claim 11, wherein, The heat energy collector provides heat energy for the heat source medium by burning energy, and the flue gas generated by the burning energy of the heat energy collector is directly discharged to the environment or discharged to the environment after being cooled by heat exchange of the intermediate evaporator of the combined cooling heating and power unit.

13. The absorption chiller-heat pump system according to any one of claims 1 to 10, wherein, The circulating working medium of the absorption combined cooling heating and power system is any one or a combination of multiple of ammonia water, lithium bromide aqueous solution, ammonia salt solution, and ionic solution.

14. A method of adjusting the concentration of a circulating working fluid of an absorption-based combined cooling and heating system according to any one of claims 1 to 13, characterized in that, The method comprises the steps of: A. Controlling the valve opening degrees of the refrigerant medium intermediate throttle valve and the refrigerant medium throttle valve of the combined cooling heating and power unit, adjusting the liquid level height of the refrigerant medium in the gas-liquid separator, so as to realize small-range adjustment of the concentration of the circulating working medium; and B. Adjusting the liquid level heights of the first storage tank and the second storage tank of the concentration unit, or replacing the solutions in the combined cooling heating and power unit by the first storage tank, the second storage tank and vacuum treatment of the combined cooling heating and power unit, so as to realize large-range adjustment of the concentration of the circulating working medium.

15. The method of claim 14, wherein the concentration of the circulating working fluid is adjusted by varying the temperature of the heat source. The first storage tank is a solution storage tank, the second storage tank is a working medium storage tank, and the step B comprises the steps of: B1. Increasing the liquid level height of the dilute solution in the first storage tank and decreasing the liquid level height of the working medium in the second storage tank, so as to increase the concentration of the circulating working medium of the absorption combined cooling heating and power system; and B2. Decreasing the liquid level height of the dilute solution in the first storage tank and increasing the liquid level height of the working medium in the second storage tank, so as to decrease the concentration of the circulating working medium of the absorption combined cooling heating and power system.

16. The method of claim 15, wherein the concentration of the circulating working fluid is adjusted by varying the temperature of the heat source. In the step B, the liquid level height of the first storage tank is adjusted by a solution pump, a first inlet valve and a first outlet valve, and the liquid level height of the second storage tank is adjusted by a liquid ammonia working medium pump, a second inlet valve and a second outlet valve.

17. The method of claim 15, wherein the concentration of the circulating working fluid is adjusted by varying the temperature of the heat source. The step B1 comprises the steps of: B11. Closing the heat source inlet valve, the first outlet valve and the second inlet valve of the concentration adjustment unit, opening the first inlet valve and the second outlet valve, adjusting the opening degrees of the first inlet valve and the solution throttle valve, so that part of the dilute solution enters the first storage tank and causes the liquid level of the first storage tank to rise; and B12. Adjusting the opening degrees of the second outlet valve and the refrigerant medium throttle valve, so that part of the working medium enters the gas-liquid separator and causes the liquid level of the second storage tank to decrease. The step B1 comprises the steps of:

18. The method of claim 17, wherein the concentration of the circulating working fluid is adjusted by varying the temperature of the heat source. B21. Closing the heat source inlet valve and the first inlet valve of the concentration adjustment unit, adjusting the opening degrees of the refrigerant medium intermediate throttle valve, the second inlet valve, the refrigerant medium throttle valve and the second outlet valve, so as to increase the liquid level height of the second storage tank; and B22. Closing the second inlet valve and the second outlet valve, opening the heat source inlet valve of the concentration adjustment unit, closing the heat source inlet valve and the first inlet valve of the combined cooling heating and power unit, heating the first storage tank by a heating unit, when the pressure of the first storage tank is higher than that of the generator, opening and controlling the first outlet valve, so as to decrease the liquid level height of the first storage tank. The step B1 comprises the steps of: B11. Closing the first outlet valve and the second inlet valve, opening the first inlet valve and the second outlet valve, adjusting the opening degrees of the first inlet valve and the solution intermediate throttle valve, so that part of the dilute solution enters the first storage tank and causes the liquid level of the first storage tank to rise; and 19. The method of claim 15, wherein the concentration of the circulating working fluid is adjusted by varying the temperature of the heat source. B12. Adjusting the opening degrees of the second outlet valve and the refrigerant medium throttle valve, so that part of the working medium enters the gas-liquid separator and causes the liquid level of the second storage tank to decrease. ​ ​ B12, adjusting the opening of the second outlet valve and the refrigerant throttling valve, so that part of the refrigerant enters the CCHP unit, resulting in the liquid level of the second storage tank being lowered.

20. The method of claim 19, wherein the concentration of the circulating working fluid is adjusted by varying the temperature of the heat source. The step B2 comprises steps of: B21, adjusting the opening of the refrigerant intermediate throttling valve, the second inlet valve, the refrigerant throttling valve and the second outlet valve, so as to increase the liquid level of the second storage tank; and B22, opening the first outlet valve, and pumping the dilute solution into the generator through the second pipeline by the second solution circulating pump, so as to lower the liquid level of the first storage tank. The first storage tank and the second storage tank are both solution storage tanks, and the step B1 comprises steps of:

21. The method of claim 15, wherein the concentration of the circulating working fluid is adjusted by varying the temperature of the heat source. B11, first vacuumizing the first storage tank, closing the first outlet valve, opening the low-level liquid discharge valve and the first inlet valve, so that the solution in the CCHP unit enters the first storage tank through the low-level liquid discharge valve, thereby increasing the liquid level of the first storage tank; and B12, first vacuumizing the CCHP unit, closing the second inlet valve, opening the second outlet valve, so that the concentrated solution in the second storage tank enters the CCHP unit, thereby lowering the liquid level of the second storage tank. The step B2 comprises steps of: B21, first vacuumizing the second storage tank, closing the second outlet valve, opening the low-level liquid discharge valve and the second inlet valve, so that the concentrated solution in the CCHP unit enters the second storage tank through the low-level liquid discharge valve, thereby increasing the liquid level of the second storage tank; and 22. The method of claim 21, wherein the concentration of the circulating working fluid is adjusted by varying the temperature of the heat source. B22, first vacuumizing the CCHP unit, closing the first inlet valve and the low-level liquid discharge valve, opening the first outlet valve, so that the dilute solution in the first storage tank enters the CCHP unit through the first inlet valve, thereby lowering the liquid level of the first storage tank. ​ ​

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