Heating system for long-period industrial waste heat storage area

Abstract

The invention provides a heating system for a long-period industrial waste heat storage area. The heating system comprises a ground heat exchanger; the first circulating cooling water waste heat recovery device is used for recovering heat in the cooling water; the first circulating cooling water waste heat recovery device and the absorption heat pump are connected to the ground heat exchanger in parallel through valves and pipelines; the heating terminal device is connected to the absorption heat pump through a heat exchanger and a valve; the steam waste heat recovery device is connected to a generator of the absorption heat pump to form a circulation loop, the steam waste heat recovery device serves as a high-level heat source of the absorption heat pump, and the first circulating cooling water waste heat recovery device is connected with the ground heat exchanger in the non-heating season through the state of the switching valve; in the heating season, the absorption heat pump is connected with the ground heat exchanger.

Description

Technical Field

[0001] The present application belongs to the field of regional heating technology, and in particular relates to a long-cycle industrial waste heat storage regional heating system. Background Art

[0002] In the process of industrial production, a large amount of low-grade waste heat is generated. Due to the low temperature (<40℃), this kind of low-grade waste heat resource is difficult to be effectively used in production processes such as power generation, water treatment, and drying. Therefore, this kind of low-grade waste heat is often regarded as having no recycling value and is directly discharged, resulting in huge waste. In fact, if this kind of low-grade waste heat resource can be recycled and used for urban heating, it will reap huge energy-saving, environmental protection and economic benefits.

[0003] The existing low-quality waste heat resource heating technology has a significant problem: due to the lack of heating demand in the non-heating season, low-quality waste heat resources cannot be used in the non-heating season. On the one hand, this causes idle equipment and waste heat resources to be wasted, affecting the economic efficiency of the system. On the other hand, it also aggravates the urban heat island effect and affects the living environment. Summary of the invention

[0004] The present application aims to propose a long-cycle industrial waste heat storage district heating system to recycle low-grade waste heat and avoid waste of resources.

[0005] The embodiment of the present application proposes a long-period industrial waste heat storage district heating system, comprising:

[0006] A ground-mounted heat exchanger, wherein the ground-mounted heat exchanger is used to be buried in the soil;

[0007] A first circulating cooling water waste heat recovery device, the first circulating cooling water waste heat recovery device is used to recover heat in cooling water;

[0008] Absorption heat pump, the first circulating cooling water waste heat recovery device and the absorption heat pump are connected in parallel to the buried pipe heat exchanger through valves and pipelines;

[0009] A heating terminal device, wherein the heating terminal device is connected to the absorption heat pump via a heat exchanger and a valve; and

[0010] A steam waste heat recovery device, which is used to recover heat in steam. The steam waste heat recovery device is connected to the generator of the absorption heat pump to form a circulation loop. The steam waste heat recovery device serves as a high-level heat source of the absorption heat pump.

[0011] in,

[0012] By switching the state of the valve, in the non-heating season, the first circulating cooling water waste heat recovery device is connected to the underground pipe heat exchanger, and the heat transfer medium absorbs heat through the first circulating cooling water waste heat recovery device, and the circulating water in the underground pipe heat exchanger stores the heat in the underground soil;

[0013] In the heating season, the absorption heat pump is connected to the ground pipe heat exchanger, and the ground pipe heat exchanger serves as a low-level heat source of the absorption heat pump, and transfers the heat stored in the underground soil to the heating terminal device through the absorption heat pump.

[0014] In at least one possible implementation, the absorption heat pump is driven by heat extracted from the steam waste heat recovery device.

[0015] In at least one possible embodiment, the heating terminal device is connected to the first circulating cooling water waste heat recovery device through a heat exchanger and a valve, and in the heating season, the first circulating cooling water waste heat recovery device can transfer heat to the heating terminal device.

[0016] In at least one possible embodiment, the heating system also includes a second circulating cooling water waste heat recovery device, which is connected to the absorption heat pump. During the heating season, the second circulating cooling water waste heat recovery device serves as a low-level heat source of the absorption heat pump.

[0017] In at least one possible embodiment, the heating system further includes a first plate heat exchanger and a second plate heat exchanger, wherein the first plate heat exchanger includes a cold side and a hot side, and the second plate heat exchanger includes a cold side and a hot side.

[0018] The heating terminal device is connected to the cold side of the first plate heat exchanger, and the first circulating cooling water waste heat recovery device is connected to the hot side of the second plate heat exchanger.

[0019] The cold side of the second plate heat exchanger and the absorption heat pump are connected in parallel to the hot side of the first plate heat exchanger.

[0020] In at least one possible embodiment, the hot side of the first plate heat exchanger is connected in sequence to the absorber of the absorption heat pump and the condenser of the absorption heat pump.

[0021] The hot side of the first plate heat exchanger is indirectly connected to the first circulating cooling water waste heat recovery device through the cold side of the second plate heat exchanger.

[0022] In at least one possible embodiment, the heating system also includes a third plate heat exchanger, which includes a cold side and a hot side. The second circulating cooling water waste heat recovery device is connected to the hot side of the third plate heat exchanger to form a circulation loop, and the cold side of the third plate heat exchanger is connected to the evaporator of the absorption heat pump to form a circulation loop.

[0023] In at least one possible embodiment, the heating system also includes a fourth plate heat exchanger, which includes one side and the other side. The buried pipe heat exchanger is connected to one side of the fourth plate heat exchanger to form a circulation loop, and the cold side of the second plate heat exchanger and the evaporator of the absorption heat pump are connected in parallel to the other side of the fourth plate heat exchanger to form a circulation loop.

[0024] In at least one possible implementation, the heating system further includes a controller and an actuator for controlling the opening or closing of the valve.

[0025] The controller is electrically connected to the actuator.

[0026] The controller is used to send an instruction to open or close the valve, and the actuator is used to execute an action to open or close the valve.

[0027] In at least one possible embodiment, the absorption heat pump includes a generator of the absorption heat pump, a condenser of the absorption heat pump, an evaporator of the absorption heat pump and an absorber of the absorption heat pump, and the generator of the absorption heat pump, the condenser of the absorption heat pump, the evaporator of the absorption heat pump and the absorber of the absorption heat pump are connected in sequence through pipelines, and a solution that can circulate is contained in the pipelines.

[0028] By adopting the above technical solution, by storing low-grade waste heat resources in the soil during the non-heating season and absorbing and utilizing the heat stored in the soil during the heating season, the waste of low-grade waste heat resources in the non-heating season is reduced, and the waste of low-grade waste heat resources is solved or alleviated. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the principle of a long-period industrial waste heat storage district heating system according to an embodiment of the present application is shown.

[0030] Description of Reference Numerals

[0031] 1Heating terminal device 1IHeating terminal device water inlet 1OHeating terminal device water outlet

[0032] 2The first plate heat exchanger 2COThe first plate heat exchanger cold side water outlet 2CIThe first plate heat exchanger cold side water inlet 2HOThe first plate heat exchanger hot side water outlet 2HIThe first plate heat exchanger hot side water inlet

[0033] 3Steam waste heat recovery device 3ISteam waste heat recovery device water inlet 3OSteam waste heat recovery device water outlet

[0034] 4The second plate heat exchanger 4COThe second plate heat exchanger cold side water outlet 4CIThe second plate heat exchanger cold side water inlet 4HOThe second plate heat exchanger hot side water outlet 4HIThe second plate heat exchanger hot side water inlet

[0035] 5 Absorption heat pump 51 Generator of absorption heat pump 52 Condenser of absorption heat pump 53 Evaporator of absorption heat pump 54 Absorber of absorption heat pump

[0036] 6First circulating cooling water waste heat recovery device 6IFirst circulating cooling water waste heat recovery device water inlet 6OFirst circulating cooling water waste heat recovery device water outlet

[0037] 73rd plate heat exchanger 7CO3rd plate heat exchanger cold side water outlet 7CI3rd plate heat exchanger cold side water inlet 7HO3rd plate heat exchanger hot side water outlet 7HI3rd plate heat exchanger hot side water inlet

[0038] 84th plate heat exchanger 8CO Water outlet on one side of the 4th plate heat exchanger 8CI Water inlet on one side of the 4th plate heat exchanger 8HO Water outlet on the other side of the 4th plate heat exchanger 8HI Water inlet on the other side of the 4th plate heat exchanger

[0039] 9Underground pipe heat exchanger 9I Underground pipe heat exchanger water inlet 9O Underground pipe heat exchanger water outlet

[0040] 10 Second circulating cooling water waste heat recovery device 10I Second circulating cooling water waste heat recovery device water inlet 10O Second circulating cooling water waste heat recovery device water outlet

[0041] 11 first circulation pump 12 second circulation pump 13 third circulation pump 14 fourth circulation pump 15 fifth circulation pump 16 sixth circulation pump 17 seventh circulation pump 18 eighth circulation pump 19 ninth circulation pump

[0042] 20 first valve 21 second valve 22 third valve 23 fourth valve 24 fifth valve 25 sixth valve 26 seventh valve 27 eighth valve 28 ninth valve 29 tenth valve 30 eleventh valve 31 twelfth valve

[0043] 32 tenth circulation pump DETAILED DESCRIPTION

[0044] In order to more clearly explain the above-mentioned purposes, features and advantages of the present application, the specific implementation methods of the present application are described in detail in this section in conjunction with the accompanying drawings. In addition to the various implementation methods described in this section, the present application can also be implemented in other different ways. Without violating the spirit of the present application, those skilled in the art can make corresponding improvements, deformations and substitutions, so the present application is not limited by the specific embodiments disclosed in this section. The scope of protection of the present application shall be subject to the claims.

[0045] like Figure 1 As shown, the embodiment of the present application proposes a long-cycle industrial waste heat storage regional heating system, which includes a heating terminal device 1, a first plate heat exchanger 2, a steam waste heat recovery device 3, a second plate heat exchanger 4, an absorption heat pump 5, a first circulating cooling water waste heat recovery device 6, a third plate heat exchanger 7, a fourth plate heat exchanger 8, a buried pipe heat exchanger 9, a second circulating cooling water waste heat recovery device 10 and multiple circulating pumps and multiple valves.

[0046] The heating terminal device 1 comprises a heating terminal device water inlet 1I and a heating terminal device water outlet 1O.

[0047] The first plate heat exchanger 2 includes a cold side and a hot side. The cold side of the first plate heat exchanger 2 includes a first plate heat exchanger cold side water inlet 2CI and a first plate heat exchanger cold side water outlet 2CO. The hot side of the first plate heat exchanger 2 includes a first plate heat exchanger hot side water inlet 2HI and a first plate heat exchanger hot side water outlet 2HO.

[0048] The steam waste heat recovery device 3 comprises a steam waste heat recovery device water inlet 3I and a steam waste heat recovery device water outlet 3O.

[0049] The second plate heat exchanger 4 includes a cold side and a hot side. The cold side of the second plate heat exchanger 4 includes a second plate heat exchanger cold side water inlet 4CI and a second plate heat exchanger cold side water outlet 4CO. The hot side of the second plate heat exchanger 4 includes a second plate heat exchanger hot side water inlet 4HI and a second plate heat exchanger hot side water outlet 4HO.

[0050] The absorption heat pump 5 includes a generator 51 of the absorption heat pump, a condenser 52 of the absorption heat pump, an evaporator 53 of the absorption heat pump and an absorber 54 of the absorption heat pump. The generator 51 of the absorption heat pump, the condenser 52 of the absorption heat pump, the evaporator 53 of the absorption heat pump and the absorber 54 of the absorption heat pump are connected in sequence through pipelines, and there is a solution that can circulate in the pipelines. Figure 1 The dashed arrows in the figure indicate the pipes with the circulating solution.

[0051] The first circulating cooling water waste heat recovery device 6 comprises a first circulating cooling water waste heat recovery device water inlet 6I and a first circulating cooling water waste heat recovery device water outlet 6O.

[0052] The third plate heat exchanger 7 includes a cold side and a hot side. The cold side of the third plate heat exchanger 7 includes a third plate heat exchanger cold side water inlet 7CI and a third plate heat exchanger cold side water outlet 7CO. The hot side of the third plate heat exchanger 7 includes a third plate heat exchanger hot side water inlet 7HI and a third plate heat exchanger hot side water outlet 7HO.

[0053] The fourth plate heat exchanger 8 includes one side ( Figure 1 The lower side of the Figure 1 The fourth plate heat exchanger 8 has one side including a water inlet 8CI on one side of the fourth plate heat exchanger and a water outlet 8CO on one side of the fourth plate heat exchanger. The other side of the fourth plate heat exchanger 8 has a water inlet 8HI on the other side of the fourth plate heat exchanger and a water outlet 8HO on the other side of the fourth plate heat exchanger.

[0054] The ground pipe heat exchanger 9 comprises a ground pipe heat exchanger water inlet 9I and a ground pipe heat exchanger water outlet 9O.

[0055] The second circulating cooling water waste heat recovery device 10 comprises a second circulating cooling water waste heat recovery device water inlet 10I and a second circulating cooling water waste heat recovery device water outlet 10O.

[0056] The plurality of circulation pumps may include a first circulation pump 11 , a second circulation pump 12 , a third circulation pump 13 , a fourth circulation pump 14 , a fifth circulation pump 15 , a sixth circulation pump 16 , a seventh circulation pump 17 , an eighth circulation pump 18 , a ninth circulation pump 19 and a tenth circulation pump 32 .

[0057] The plurality of valves may include a first valve 20 , a second valve 21 , a third valve 22 , a fourth valve 23 , a fifth valve 24 , a sixth valve 25 , a seventh valve 26 , an eighth valve 27 , a ninth valve 28 , a tenth valve 29 , an eleventh valve 30 , and a twelfth valve 31 .

[0058] In this embodiment, the heating terminal device 1 refers to various terminal devices in the prior art used to meet the heating needs of the building. The heating terminal device 1 may include a heating radiator, a fan coil, a heating radiant floor, a capillary natural convection radiator, and the like.

[0059] The first circulating cooling water waste heat recovery device 6 and the second circulating cooling water waste heat recovery device 10 refer to devices for recovering heat in industrial circulating cooling water, including various types of water-water heat exchangers in the prior art.

[0060] The steam waste heat recovery device 3 refers to a device for recovering heat in industrial steam, including various types of steam-water heat exchangers in the prior art.

[0061] The ground pipe heat exchanger 9 refers to a heat exchanger used in the prior art to exchange and store heat in underground soil, including a single U-shaped ground pipe heat exchanger, a double U-shaped ground pipe heat exchanger, a sleeve-type ground pipe heat exchanger, and the like.

[0062] The first plate heat exchanger 2, the second plate heat exchanger 4, the third plate heat exchanger 7 and the fourth plate heat exchanger 8 refer to heat exchange devices used for exchanging heat between cold and hot fluids in the prior art.

[0063] Multiple circulation pumps refer to equipment used in the prior art for circulating heat transfer medium in connecting pipelines.

[0064] The plurality of valves may include butterfly valves, gate valves, ball valves, flow regulating valves, and the like.

[0065] The long-cycle industrial waste heat storage district heating system also includes a controller and an actuator, and the controller and the actuator are electrically connected.

[0066] The controller can control the opening or closing of multiple valves. The controller can open or close the corresponding valves as needed according to the specified system operation mode (such as heat storage mode, heating mode), and send the command to open or close the valve to the actuator. The controller can be a programmable controller or a single-chip microcomputer, etc.

[0067] The actuator may be an electric actuator, which may receive instructions sent by the controller and perform corresponding actions to open or close the corresponding valve. The actuator may be a part-rotation electric actuator or a multi-rotation electric actuator, etc.

[0068] The cold side of the first plate heat exchanger 2 can be connected to the heating terminal device 1 through the third circulation pump 13 and the pipeline, and the heat transfer medium can circulate between the cold side of the first plate heat exchanger 2 and the heating terminal device 1, thereby transferring heat to the heating terminal device 1. Specifically, the water outlet 10 of the heating terminal device can be connected to the water inlet of the third circulation pump 13, the water outlet of the third circulation pump 13 can be connected to the cold side water inlet 2CI of the first plate heat exchanger, and the cold side water outlet 2CO of the first plate heat exchanger can be connected to the water inlet 1I of the heating terminal device.

[0069] The hot side of the second plate heat exchanger 4 can be connected to the first circulating cooling water waste heat recovery device 6 through the second circulating pump 12 and the pipeline, and the heat transfer medium can circulate between the hot side of the second plate heat exchanger 4 and the first circulating cooling water waste heat recovery device 6, thereby transferring the heat absorbed by the first circulating cooling water waste heat recovery device 6. Specifically, the cold side of the second plate heat exchanger 4 can be connected to the other side of the fourth plate heat exchanger 8, and one side of the fourth plate heat exchanger 8 can be connected to the buried pipe heat exchanger 9, so that in the non-heating season, the heat recovered by the first circulating cooling water waste heat recovery device 6 can be transferred to the buried pipe heat exchanger 9, and then the heat can be stored in the soil. The other side of the fourth plate heat exchanger 8 ( Figure 1 The upper side, cold side) can also be connected to the hot side of the first plate heat exchanger 2. In the heating season, the heat recovered by the first circulating cooling water waste heat recovery device 6 can be transferred to the heating terminal device 1 through the second plate heat exchanger 4 and the first plate heat exchanger 2 for heating.

[0070] Specifically, the cold side water outlet 4CO of the second plate heat exchanger can be connected to one end of the tenth valve 29, the other end of the tenth valve 29 can be connected to the water inlet of the fourth circulation pump 14, the water outlet of the fourth circulation pump 14 can be connected to the water inlet 8HI on the other side of the fourth plate heat exchanger, the water outlet 8HO on the other side of the fourth plate heat exchanger can be connected to one end of the ninth valve 28, and the other end of the ninth valve 28 can be connected to the cold side water inlet 4CI of the second plate heat exchanger.

[0071] The first circulating cooling water waste heat recovery device 6 and the absorption heat pump 5 can be connected in parallel to the buried pipe heat exchanger 9, or in other words, the cold side of the second plate heat exchanger 4 and the evaporator 53 of the absorption heat pump can be connected in parallel to the other side (cold side) of the fourth plate heat exchanger 8. The controller and the actuator switch the state of each valve, so that in the non-heating season, the cold side of the second plate heat exchanger 4 and the other side (hot side) of the fourth plate heat exchanger 8 are connected, and in the heating season, the evaporator 53 of the absorption heat pump and the other side (hot side) of the fourth plate heat exchanger 8 are connected. Figure 1 The upper side, cold side) is connected.

[0072] The hot side of the first plate heat exchanger 2 may have two circulation loops, wherein one circulation loop may include an absorber 54 and a condenser 52 of an absorption heat pump, and the other circulation loop may include a cold side of the second plate heat exchanger 4 .

[0073] The heat transfer medium (water) in the two circulation loops is low-temperature return water after heat exchange with the heating terminal device 1. The heat transfer medium absorbs heat through the absorber 54 and the condenser 52 of the absorption heat pump, and absorbs heat from the first circulating cooling water waste heat recovery device 6 through the second plate heat exchanger 4, and then merges and returns to the hot side water inlet 2HI of the first plate heat exchanger to transfer heat to the heating terminal device 1.

[0074] Specifically, in the present embodiment, a circulation loop on the hot side of the first plate heat exchanger 2: the hot side water outlet 2HO of the first plate heat exchanger can be connected to one end of the second valve 21, the other end of the second valve 21 can be connected to the water inlet of the absorber 54 of the absorption heat pump, the water outlet of the absorber 54 of the absorption heat pump can be connected to the water inlet of the condenser 52 of the absorption heat pump, the water outlet of the condenser 52 of the absorption heat pump can be connected to the water inlet of the sixth circulation pump 16, the water outlet of the sixth circulation pump 16 can be connected to one end of the first valve 20, and the other end of the first valve 20 can be connected to the hot side water inlet 2HI of the first plate heat exchanger.

[0075] Specifically, in this embodiment, another circulation loop on the hot side of the first plate heat exchanger 2: the other end of the second valve 21 can also be connected to one end of the eleventh valve 30, the other end of the eleventh valve 30 is connected to the cold side water inlet 4CI of the second plate heat exchanger, the cold side water outlet 4CO of the second plate heat exchanger can be connected to one end of the twelfth valve 31, the other end of the twelfth valve 31 can be connected to the water inlet of the fifth circulation pump 15, the water outlet of the fifth circulation pump 15 can be connected to the water inlet of the sixth circulation pump 16, the water outlet of the sixth circulation pump 16 can be connected to one end of the first valve 20, and the other end of the first valve 20 can be connected to the hot side water inlet 2HI of the first plate heat exchanger. One circulation loop on the hot side of the first plate heat exchanger 2 and another circulation loop on the hot side of the first plate heat exchanger 2 can be combined at the water inlet of the sixth circulation pump 16 or the pipeline connected to the water inlet.

[0076] One side of the fourth plate heat exchanger 8 can be connected to the ground heat exchanger 9 through the first circulation pump 11 and the pipeline, and the heat transfer medium can circulate between the one side of the fourth plate heat exchanger 8 and the ground heat exchanger 9, so that heat can be transferred to the ground heat exchanger 9 (soil) in the non-heating season, and heat can be transferred from the ground heat exchanger 9 (soil) to the fourth plate heat exchanger 8 in the heating season. Specifically, the water outlet 8CO on one side of the fourth plate heat exchanger can be connected to the water inlet of the ground heat exchanger 9, the water outlet of the ground heat exchanger 9 can be connected to the water inlet of the first circulation pump 11, and the water outlet of the first circulation pump 11 can be connected to the water inlet 8CI on one side of the fourth plate heat exchanger.

[0077] The other side of the fourth plate heat exchanger 8 can also be connected to the evaporator 53 of the absorption heat pump. The heat absorbed by the ground pipe heat exchanger 9 in the heating season can be transferred to the evaporator 53 of the absorption heat pump through the fourth plate heat exchanger 8, as a low-level heat source of the absorption heat pump 4 (recycling low-grade waste heat). Specifically, the water outlet 8HO on the other side of the fourth plate heat exchanger can be connected to one end of the eighth valve 27, the other end of the eighth valve 27 can be connected to the water inlet of the seventh circulation pump 17, the water outlet of the seventh circulation pump 17 can be connected to the water inlet of the evaporator 53 of the absorption heat pump, the water outlet of the evaporator 53 of the absorption heat pump can be connected to one end of the seventh valve 26, and the other end of the seventh valve 26 can be connected to the water inlet 8HI on the other side of the fourth plate heat exchanger.

[0078] The buried pipe heat exchanger 9 and the second circulating cooling water waste heat recovery device 10 can be connected in parallel to the evaporator 53 of the absorption heat pump. The heat stored in the underground soil by the buried pipe heat exchanger 9 and the heat absorbed by the second circulating cooling water waste heat recovery device 10 can be used together as the low-level heat source of the absorption heat pump 5.

[0079] The second circulating cooling water waste heat recovery device 10 can be connected to the hot side of the third plate heat exchanger 7 through the ninth circulating pump 19 and the pipeline. The heat transfer medium can circulate between the hot side of the third plate heat exchanger 7 and the second circulating cooling water waste heat recovery device 10, thereby transferring the heat absorbed by the second circulating cooling water waste heat recovery device 10. Specifically, the water outlet 10O of the second circulating cooling water waste heat recovery device can be connected to the water inlet of the ninth circulating pump 19, the drain outlet of the ninth circulating pump 19 can be connected to the hot side water inlet 7HI of the third plate heat exchanger, and the hot side water outlet 7HO of the third plate heat exchanger can be connected to the water inlet 10I of the second circulating cooling water waste heat recovery device.

[0080] The cold side of the third plate heat exchanger 7 can be connected to the evaporator 53 of the absorption heat pump through the eighth circulation pump 18 and the pipeline. Specifically, the cold side water outlet 7CO of the third plate heat exchanger can be connected to one end of the fifth valve 24, the other end of the fifth valve 24 can be connected to the water inlet of the eighth circulation pump 18, the water outlet of the eighth circulation pump 18 can be connected to the water inlet of the evaporator 53 of the absorption heat pump, the water outlet of the evaporator 53 of the absorption heat pump can be connected to one end of the sixth valve 25, and the other end of the sixth valve 25 can be connected to the cold side water inlet 7CI of the third plate heat exchanger.

[0081] The steam waste heat recovery device 3 is directly connected to the absorption heat pump generator 51. The heat transfer medium (water) can absorb the steam waste heat and circulate it to enter the absorption heat pump generator 51 to release heat. This heat can be used as a high-level heat source for the absorption heat pump (recycling high-grade waste heat). Specifically, the water outlet 3O of the steam waste heat recovery device can be connected to the water inlet of the tenth circulation pump 32, the water outlet of the tenth circulation pump 32 can be connected to one end of the fourth valve 23, the other end of the fourth valve 23 can be connected to the water inlet of the absorption heat pump generator 51, the water outlet of the absorption heat pump generator 51 can be connected to one end of the third valve 22, and the other end of the third valve 22 can be connected to the water inlet 3I of the steam waste heat recovery device.

[0082] The long-cycle industrial waste heat storage regional heating system of the present application can switch between heat storage mode and heating mode. In the non-heating season, the system can operate in heat storage mode, and in the heating season, the system can operate in heating mode.

[0083] In the non-heating season, the long-cycle industrial waste heat storage regional heating system can be operated in heat storage mode. At this time, the ninth valve 28 and the tenth valve 29 are opened, and the remaining valves are closed. The first circulation pump 11, the second circulation pump 12 and the fourth circulation pump 14 are started, and the remaining circulation pumps are closed. The first circulating cooling water waste heat recovery device 6 and the buried pipe heat exchanger 9 can be indirectly connected through the second plate heat exchanger 4 and the fourth plate heat exchanger 8. The heat transfer medium can absorb heat through the first circulating cooling water waste heat recovery device 6, and transfer the heat to the circulating water in the buried pipe heat exchanger 9 through the second plate heat exchanger 4 and the fourth plate heat exchanger 8, and store the heat in the underground soil for use in the heating season.

[0084] During the heating season, the long-cycle industrial waste heat storage regional heating system can be operated in heating mode. At this time, the ninth valve 28 and the tenth valve 29 are closed, the other valves are open, the fourth circulation pump 14 is closed, and the other circulation pumps are started. The underground pipe heat exchanger 9 and the second circulating cooling water waste heat recovery device 10 are connected in parallel to the absorption heat pump evaporator 53. The underground pipe heat exchanger 9 and the second circulating cooling water waste heat recovery device 10 can absorb heat and transfer heat to the absorption heat pump evaporator 53. This part of heat serves as a low-level heat source for the absorption heat pump 5. The steam waste heat recovery device 3 is directly connected to the absorption heat pump generator 51 to form a circulation channel. The heat transfer medium can enter the absorption heat pump generator 51 to release heat after the steam waste heat recovery device 3 absorbs the steam waste heat. This heat can be used as a high-level heat source for the absorption heat pump 5. The absorption heat pump 5 can recycle low-grade waste heat through the solution circulating inside it. The heating terminal device 1 can absorb heat from the absorption heat pump absorber 54, the absorption heat pump condenser 52 and the first circulating cooling water waste heat recovery device 6 for heating.

[0085] It can be understood that when the state of the valve is switched between the heating season and the non-heating season, the cold side and the hot side of the fourth plate heat exchanger 8 are switched.

[0086] The beneficial effects of the long-period industrial waste heat storage regional heating system of the present application include at least the following aspects.

[0087] (1) The long-term industrial waste heat storage district heating system can utilize low-grade waste heat over a long period of time spanning the heating season and the non-heating season. That is, in a one-year cycle, low-grade waste heat resources are stored in the soil in the non-heating season, and the heat stored in the soil is absorbed and utilized in the heating season. This reduces the waste of low-grade waste heat resources in the non-heating season, and solves or alleviates the problem of unbalanced seasonal utilization of industrial waste heat and waste of low-grade waste heat resources.

[0088] (2) High-grade waste heat is used to drive the absorption heat pump 5, thereby extracting other low-grade waste heat resources and cross-season waste heat resources stored in the soil, realizing the integrated utilization of various industrial waste heat resources of different grades, realizing the year-round utilization of industrial waste heat resources, reducing the waste of low-grade waste heat resources in the non-heating season, and improving the utilization rate and economy of each device in the system. The system can extract low-grade waste heat resources without relying on electricity, avoiding the waste of high-grade energy, reducing a large amount of pollutants and carbon dioxide emissions, and has good energy-saving and environmental protection benefits.

[0089] It should be understood that at least some aspects or features of the above-mentioned implementation modes, embodiments or examples may be appropriately combined.

[0090] It is understood that in the present application, when the number of parts or components is not particularly limited, the number may be one or more, and the multiple here means two or more. For the case where the number of parts or components shown in the drawings and / or described in the specification is a specific number such as two, three, four, etc., the specific number is usually exemplary and not restrictive, and it can be understood as multiple, that is, two or more, but this does not mean that the present application excludes the case of one.

[0091] In this application, unless otherwise clearly stated or limited, terms such as "install", "assemble", "assemble", "connect", "connect", "couple", "link", "abut", "connect", "interconnect", "intercommunication", "conduction", "fixation", and "fastening" should be understood in a broad sense. For example, they can be direct or indirect (for example, indirect connection through a heat exchanger). For example, with respect to connection, it can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly stated or limited. For example, with respect to connectivity / conduction, it can be direct connectivity / conduction or indirect connectivity / conduction via an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0092] In the present application, unless otherwise clearly stated or limited, a component disposed on / installed on / located on / accommodated on / placed in, within, inside, etc. another component may be any of the following two situations: a part or most of the one component is located in the other component; and the one component is completely accommodated in the other component.

[0093] Although the present application is described in detail using the above-mentioned embodiments, it is obvious to those skilled in the art that the present application is not limited to the embodiments described in this specification. The present application can be modified and implemented as a modified embodiment without departing from the subject matter and scope of the present application as determined by the claims. Therefore, the description in this specification is for the purpose of illustration and does not have any restrictive meaning for the present application.

Claims

1. A long-cycle industrial waste heat storage district heating system, characterized in that: include: A ground pipe heat exchanger (9), wherein the ground pipe heat exchanger (9) is used to be buried in the soil; A first circulating cooling water waste heat recovery device (6), wherein the first circulating cooling water waste heat recovery device (6) is used to recover heat in cooling water; An absorption heat pump (5), wherein the first circulating cooling water waste heat recovery device (6) and the absorption heat pump (5) are connected in parallel to the underground heat exchanger (9) via a valve and a pipeline; A heating terminal device (1), the heating terminal device (1) being connected to the absorption heat pump (5) via a heat exchanger and a valve; and A steam waste heat recovery device (3), the steam waste heat recovery device (3) is used to recover heat in steam, the steam waste heat recovery device (3) is connected to the generator (51) of the absorption heat pump (5) to form a circulation loop, and the steam waste heat recovery device (3) serves as a high-level heat source of the absorption heat pump (5). in, By switching the state of the valve, in the non-heating season, the first circulating cooling water waste heat recovery device (6) and the underground pipe heat exchanger (9) are connected, and the heat transfer medium absorbs heat through the first circulating cooling water waste heat recovery device (6), and the heat is stored in the underground soil through the circulating water in the underground pipe heat exchanger (9); In the heating season, the absorption heat pump (5) and the ground pipe heat exchanger (9) are connected, and the ground pipe heat exchanger (9) serves as a low-level heat source for the absorption heat pump (5), and transfers the heat stored in the underground soil to the heating terminal device (1) through the absorption heat pump (5).

2. The long-period industrial waste heat storage district heating system according to claim 1 is characterized in that: The absorption heat pump (5) is driven by utilizing the heat extracted from the steam waste heat recovery device (3).

3. The long-period industrial waste heat storage district heating system according to claim 1 is characterized in that: The heating terminal device (1) is connected to the first circulating cooling water waste heat recovery device (6) via a heat exchanger and a valve. In the heating season, the first circulating cooling water waste heat recovery device (6) can transfer heat to the heating terminal device (1).

4. The long-period industrial waste heat storage district heating system according to claim 1 is characterized in that: The heating system further comprises a second circulating cooling water waste heat recovery device (10), wherein the second circulating cooling water waste heat recovery device (10) is connected to the absorption heat pump (5), and during the heating season, the second circulating cooling water waste heat recovery device (10) serves as a low-level heat source of the absorption heat pump (5).

5. The long-period industrial waste heat storage district heating system according to claim 1 is characterized in that: The heating system further comprises a first plate heat exchanger (2) and a second plate heat exchanger (4), wherein the first plate heat exchanger (2) comprises a cold side and a hot side, and the second plate heat exchanger (4) comprises a cold side and a hot side. The heating terminal device (1) is connected to the cold side of the first plate heat exchanger (2), and the first circulating cooling water waste heat recovery device (6) is connected to the hot side of the second plate heat exchanger (4). The cold side of the second plate heat exchanger (4) and the absorption heat pump (5) are connected in parallel to the hot side of the first plate heat exchanger (2).

6. The long-period industrial waste heat storage district heating system according to claim 5 is characterized in that: The hot side of the first plate heat exchanger (2) is connected in sequence to the absorber (54) of the absorption heat pump (5) and the condenser (52) of the absorption heat pump (5). The hot side of the first plate heat exchanger (2) is indirectly connected to the first circulating cooling water waste heat recovery device (6) via the cold side of the second plate heat exchanger (4).

7. The long-period industrial waste heat storage district heating system according to claim 4 is characterized in that: The heating system also includes a third plate heat exchanger (7), the third plate heat exchanger (7) includes a cold side and a hot side, the second circulating cooling water waste heat recovery device (10) is connected to the hot side of the third plate heat exchanger (7) to form a circulation loop, and the cold side of the third plate heat exchanger (7) is connected to the evaporator (53) of the absorption heat pump (5) to form a circulation loop.

8. The long-period industrial waste heat storage district heating system according to claim 5 is characterized in that: The heating system further comprises a fourth plate heat exchanger (8), the fourth plate heat exchanger (8) comprising a side and another side, the buried pipe heat exchanger (9) being connected to one side of the fourth plate heat exchanger (8) to form a circulation loop, and the cold side of the second plate heat exchanger (4) and the evaporator (53) of the absorption heat pump (5) being connected in parallel to the other side of the fourth plate heat exchanger (8) to form a circulation loop.

9. The long-period industrial waste heat storage district heating system according to claim 1 is characterized in that: The heating system also includes a controller and an actuator for controlling the opening or closing of the valve. The controller is electrically connected to the actuator. The controller is used to send an instruction to open or close the valve, and the actuator is used to execute an action to open or close the valve.

10. The long-period industrial waste heat storage district heating system according to claim 1 is characterized in that: The absorption heat pump (5) comprises a generator (51) of the absorption heat pump, a condenser (52) of the absorption heat pump, an evaporator (53) of the absorption heat pump and an absorber (54) of the absorption heat pump. The generator (51) of the absorption heat pump, the condenser (52) of the absorption heat pump, the evaporator (53) of the absorption heat pump and the absorber (54) of the absorption heat pump are connected in sequence through pipelines, and a solution that can circulate is contained in the pipelines.

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