Comprehensive energy system based on mobile heat supply of gas power plant

Abstract

The invention relates to the field of comprehensive energy utilization, and discloses a comprehensive energy system based on mobile heat supply of a gas power plant. The system comprises a gas turbine waste heat boiler, a steam mother pipe adjusting valve, a first-stage temperature and pressure reducer, a centralized heat supply branch flow adjusting valve, a movable heat supply branch flow adjusting valve, a quick connector, a movable heat supply device, a second-stage temperature and pressure reducer, a steam outlet adjusting valve, a cold water inlet adjusting valve, a steam silencing heater and a water pool. The silica gel-water adsorption type refrigerating unit comprises a first adsorber, an evaporator, a second adsorber, a condenser and a valve. By means of the design, heat source butt joint with a silica gel-water adsorption type refrigerating unit is achieved, a low-grade heat source is used for driving adsorption-desorption circulation, stable heat is provided in winter, cooling capacity is provided in summer, efficient and green cold and heat combined supply all the year round is completed, and it is avoided that fluorine refrigerants are used for polluting the environment.

Description

[0001] The present application relates to the field of comprehensive energy utilization, and particularly relates to a comprehensive energy system based on mobile heat supply of a gas power plant. BACKGROUND

[0002] With the continuous optimization of China's energy structure, the proportion of gas power generation in the power system is increasing year by year. Gas power plants have become an important support for power grid load regulation due to their flexible start-stop, fast start-up speed and strong peak regulation capability. However, there is still a lot of recoverable waste heat in the exhaust gas of the unit, and the heat energy utilization rate has room for improvement. The existing heat supply system is mostly fixed arrangement, which is bound to operate with the pipe network and heat load at the unit site, and it is difficult to flexibly allocate across regions and users. When the demand is scattered or fluctuates, a large amount of waste heat is directly discharged, which not only reduces the overall energy efficiency. The fixed transformation has a long cycle and high investment, and the response capability to sudden heat or cold source demand is limited.

[0003] Although some existing gas power plants have introduced heat or refrigeration devices, they are mostly single-function systems, and lack special recovery structures and multi-energy collaborative management strategies for tail gas characteristics. There is a lack of adaptability in realizing multi-form energy output such as heat supply, cold supply and process power, and there are shortcomings in long-distance transportation, rapid switching mode, guaranteeing heat exchange efficiency and stability.

[0004] In summary, the existing energy utilization system still mainly uses single heat storage path and fixed interface structure in terms of heat storage and energy supply switching, which is difficult to flexibly adapt to different loads, different user locations and combined cooling and heating modes, resulting in low response speed and limited peak regulation capability in emergency, remote and distributed energy supply scenarios; in the medium transportation process, most systems lack multi-stage temperature and pressure reduction linkage control, which is difficult to guarantee the long-term stability of the end energy use parameters, and restricts the safe operation of high-demand industrial

[0005] and civil fields; at the same time, the low-grade waste heat utilization method is relatively single, and it cannot form a deep integration with high-temperature steam heat sources and combined cooling and heating technology, which limits the improvement of the overall energy utilization efficiency throughout the year.

[0006] Therefore, the present application proposes a comprehensive energy system that simultaneously utilizes high-temperature steam heat sources and low-grade waste heat sources, realizes efficient collaborative output of multi-form energy such as heat supply, cold supply and power, and builds a rapid switching and intelligent optimization mechanism between fixed heat networks and mobile energy supply modes, which significantly improves the overall energy utilization efficiency throughout the year and the multi-scenario adaptation capability of the system without affecting the power generation efficiency of the gas power unit. SUMMARY

[0007] The purpose of the present application is to solve the problems of the prior art, and to provide a comprehensive energy system based on mobile heat supply of a gas power plant.

[0008] The present application is achieved by the following technical solutions:

[0009] A kind of integrated energy system based on gas power plant mobile heat supply.It includes gas turbine waste heat boiler, steam main regulating valve, primary temperature and pressure reducer, centralized heat supply branch flow regulating valve, mobile heat supply branch flow regulating valve, quick interface, mobile heat supply device, secondary temperature and pressure reducer, steam outlet regulating valve, cold water inlet regulating valve, steam silencer heater, water pool, refrigeration system inlet regulating valve and silica gel-water adsorption refrigeration unit, silica gel-water adsorption refrigeration unit includes first adsorber, evaporator, second adsorber, condenser and valve.

[0010] The present application is composed of five systems: gas turbine waste heat boiler, steam pipeline, mobile heat supply device, waste heat hot water system and silica gel-water adsorption refrigeration system.

[0011] Gas turbine waste heat boiler, this part is used to generate high-temperature steam as the main energy supply medium of the system, obtain steam of certain temperature and pressure, provide heat source for fixed heat supply or mobile heat supply mode.

[0012] Steam main regulating valve, this part is arranged between gas turbine waste heat boiler and primary temperature and pressure reducer, used to adjust the steam flow entering the temperature reducer, realize total flow control, adjust steam supply amount.

[0013] Primary temperature and pressure reducer, this part is used to reduce the temperature and pressure of the entering high-temperature steam, so that it reaches the optimal temperature and pressure required by the downstream system.

[0014] Centralized heat supply branch flow regulating valve and mobile heat supply branch flow regulating valve, this part is used to split the temperature and pressure reduced steam to centralized heat supply circuit or deliver to mobile heat supply device through quick interface, realize heat supply path switching and control.

[0015] Quick interface, this part is used to establish quick connection with mobile heat supply device, has quick and accurate alignment, sealing function, can realize safe docking of energy supply line in a short time.

[0016] Mobile heat supply device, this part is external heat supply mobile terminal, receives steam from quick interface, and provides flexible heat supply service to dispersed small users through vehicle-mounted heat exchange system.

[0017] Secondary temperature and pressure reducer, this device is used to further control the temperature and pressure of the steam outlet of mobile heat supply device, provide steam parameters suitable for the required downstream process equipment.

[0018] Steam outlet regulating valve, this part is arranged at the steam outlet of heat exchange area, used to control the steam flow entering steam silencer heater.

[0019] Cold water inlet regulating valve, this part controls the cold water into the pool, used to adjust the water volume of the pool, keep the system heat cycle stable.

[0020] Steam silencer heater, this part is an energy-saving steam heater, which is arranged in parallel by multiple heaters, used to transfer steam heat energy to the heat exchange medium. The parallel structure can realize multi-pass heating, improve the heat transfer rate and reduce the load of a single heater.

[0021] Pool, this part is used to store cold water or heated water after heat exchange, forming part of the system internal heating loop, realizing the circulation and buffering function of the heat medium.

[0022] Refrigeration unit inlet regulating valve, this part controls the heated water in the pool into the silica gel-water adsorption refrigeration system.

[0023] Silica gel-water adsorption refrigeration system, this part can realize the integrated operation of heating and refrigeration module to fully utilize the boiler waste heat and provide the required cold energy of the system.

[0024] Further,

[0025] Silica gel-water adsorption refrigeration unit is composed of a first adsorber, an evaporator, a second adsorber and a condenser

[0026] First / second adsorber, this part alternately adsorbs and desorbs water vapor, the adsorption process releases cold energy, the desorption process provides heat, realizes the continuous operation of the cold-heat conversion cycle.

[0027] Evaporator, this part evaporates water at low pressure and absorbs heat, producing cold energy for cold users.

[0028] Condenser, this part condenses the water vapor produced in the desorption process into liquid water, realizing water resource recycling and recycling.

[0029] Valve, this part controls the fluid switching and circulation between the components of the combined cooling heating system

[0030] Operation mode, ensure the circulation efficiency and stability between the adsorber, evaporator and condenser.

[0031] The positional relationship and connection relationship of these parts are as follows:

[0032] Gas turbine waste heat boiler is located at the heat source end of the system, its outlet is connected with the steam main pipe regulating valve. The outlet of the first stage temperature and pressure reducer is respectively connected with the central heating branch flow regulating valve and the mobile heating branch flow regulating valve. The central heating branch flow regulating valve is connected with the branch into the fixed central heating loop, and the mobile heating branch flow regulating valve is connected with the quick connector connected to the mobile heating device.

[0033] The steam from the outlet of the mobile heat supply device is connected to a steam outlet regulating valve through the outlet of a two-stage temperature and pressure reducer, and the steam outlet regulating valve is connected to the inlets of a plurality of parallel steam silencer heaters. The outlet of the water tank is connected to a refrigeration system inlet regulating valve, and the cold water inlet regulating valve is connected to the water tank. The silica gel-water adsorption refrigeration unit is located on the other side of the heating circuit, and comprises a first adsorber and a second adsorber, which are respectively connected to an evaporator and a condenser, and the evaporator and the condenser are connected in circulation through valves.

[0034] Compared with the prior art, the present application has the following advantages:

[0035] By using the high-temperature waste heat in the boiler exhaust in the present application, the high-temperature direct supply and low-grade energy cascade utilization can be realized, and the overall energy efficiency of power generation can be significantly improved.

[0036] By arranging two independent branch pipes at the end of the main pipe network in the present application, one branch pipe is quickly connected to the mobile heat supply vehicle through a quick connector, which is suitable for long-distance or distributed heat supply demand, and the other branch pipe is directly connected to the fixed area heat network through a branch flow regulating valve, thereby realizing instant supply to local users and balancing flexibility and stability.

[0037] The quick connector designed in the present application can complete physical connection and medium transmission start-up with the mobile heat supply vehicle in a short time, thereby greatly improving the response speed and system operation efficiency of temporary heat supply.

[0038] By arranging a plurality of steam silencer heaters in the water tank in the present application, a uniform flow field and a large-area heat exchange interface are formed, the steam heat exchange area for hot water is increased, and the temperature rising time is shortened.

[0039] By connecting the heat source to the silica gel-water adsorption refrigeration unit designed in the present application, the adsorption-desorption cycle is driven by using low-grade heat source, stable heat is provided in winter, cold is provided in summer, annual efficient and green cold and heat supply is completed, and the pollution caused by the use of fluorine-based refrigerants to the environment is avoided.

[0040] BRIEF DESCRIPTION OF DRAWINGS

[0041] Fig. 1 is a structural schematic diagram of the present application.

[0042] Fig. 2 is a structural schematic diagram of the steam silencer heater of the present application.

[0043] Fig. 3 is a structural schematic diagram of the quick connector of the present application.

[0044] Fig. 4 is a schematic diagram of the silica gel-water adsorption refrigeration unit of the present application.

[0045] ​Brief description of drawings: 1, gas turbine waste heat boiler, 111, first adsorber, 112, evaporator, 113, second adsorber, 114, condenser, 115, valve, 2, steam main regulating valve, 3, primary temperature and pressure reducer, 4, central heating branch flow regulating valve, 5, mobile heating branch flow regulating valve, 6, quick connector, 7, mobile heating device, 8, secondary temperature and pressure reducer, 9, steam outlet regulating valve, 10, cold water inlet regulating valve, 11, steam silencer heater, 12, water tank, 13, refrigeration system inlet regulating valve, 14, silica gel-water adsorption refrigeration unit. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0047] Please refer to FIGS. 1-4, the present application provides a technical solution:

[0048] A comprehensive energy system based on mobile heating of a gas power plant. It includes a gas turbine waste heat boiler 1, a steam main regulating valve 2, a primary temperature and pressure reducer 3, a central heating branch flow regulating valve 4, a mobile heating branch flow regulating valve 5, a quick connector 6, a mobile heating device 7,

[0049] a secondary temperature and pressure reducer 8, a steam outlet regulating valve 9, a cold water inlet regulating valve 10, a steam silencer heater 11, a water tank 12, a refrigeration system inlet regulating valve 13, and a silica gel-water adsorption refrigeration unit 14, which includes a first adsorber 111, an evaporator 112, a second adsorber 113, a condenser 114, and a valve 115.

[0050] The present application is composed of five systems: a gas turbine waste heat boiler 1, a steam pipeline, a mobile heating device 7, a waste heat heating water system, and a silica gel-water adsorption refrigeration system 14.

[0051] The gas turbine waste heat boiler 1 is used to generate high-temperature steam as the main energy supply medium of the system, and obtain steam at a certain temperature and pressure to provide a heat source for fixed heating or mobile heating mode.

[0052] Steam main regulating valve 2, which is arranged between the gas turbine waste heat boiler 1 and the first-stage desuperheater and pressure reducer 3, is used to adjust the steam flow entering the desuperheater, realize total flow control, and adjust the steam supply amount.

[0053] First-stage desuperheater and pressure reducer 3, which is used to desuperheat and depressurize the high-temperature steam entering, so as to make it reach the optimal temperature and pressure required by the downstream system.

[0054] Central heating branch flow regulating valve 4 and mobile heating branch flow regulating valve 5, which are used to divide the desuperheated and depressurized steam into the central heating loop or delivered to the mobile heating device 7 through the quick interface 6, realize the switching and control of the heating path.

[0055] Quick interface 6, which is used to establish a quick connection with the mobile heating device 7, has the functions of quick and accurate alignment and sealing, and can realize the safe docking of the energy supply line in a short time.

[0056] Mobile heating device 7, which is an external mobile heating terminal, receives steam from the quick interface 6 and provides flexible heating services to scattered small users through the vehicle-mounted heat exchange system.

[0057] Second-stage desuperheater and pressure reducer 8, which is used to further desuperheat and depressurize the steam at the outlet of the mobile heating device, provides steam parameters suitable for the downstream process equipment.

[0058] Steam outlet regulating valve 9, which is arranged at the steam outlet of the heat exchange area, is used to control the steam flow entering the steam silencer heater 11.

[0059] Cold water inlet regulating valve 10, which controls the cold water entering the water pool 12, is used to adjust the water amount of the water pool and keep the system heat cycle stable.

[0060] Steam silencer heater 11, which is an energy-saving steam heater, is composed of multiple heaters arranged in parallel and is used to transfer steam heat to the heat exchange medium. The parallel structure can realize multi-pass heating, improve the heat transfer rate, and reduce the load of a single heater.

[0061] Water pool 12, which is used to store cold water or heated water after heat exchange, forms part of the internal heating loop of the system and realizes the circulation and buffering functions of the heat medium.

[0062] Refrigeration unit inlet regulating valve 13, which controls the heated water in the water pool 12 entering the silica gel-water adsorption refrigeration system 14.

[0063] The silica gel-water adsorption refrigeration system 14 is a module capable of realizing integrated operation of heating and refrigeration, so as to fully utilize the waste heat of the boiler and provide the cold energy required by the system.

[0064] Further,

[0065] The silica gel-water adsorption refrigeration unit 14 is composed of a first adsorber 111, an evaporator 112, a second adsorber 113 and a condenser 114

[0066] The first adsorber 111 / second adsorber 113 alternately adsorbs and desorbs water vapor, releases cold energy in the adsorption process and provides heat in the desorption process, so as to realize continuous operation of the cold-heat conversion cycle.

[0067] The evaporator 112 evaporates water under low pressure and absorbs heat to generate cold energy for

[0068] the use of cold users.

[0069] The condenser 114 condenses the water vapor generated in the desorption process into liquid water, so as to realize water resource recycling and recycling.

[0070] The valve 115 controls the fluid switching and circulation operation mode between the components of the combined cooling heating and power system, so as to ensure the circulation efficiency and stability between the adsorbers, evaporators and condensers.

[0071] The positional relationship and connection relationship of these parts are as follows:

[0072] The gas turbine waste heat boiler 1 is located at the heat source end of the system, and the outlet thereof is connected to the steam main pipe regulating valve 2. The outlet of the first desuperheater 3 is connected to the central heating branch flow regulating valve 4 and the mobile heating branch flow regulating valve 5, respectively. The central heating branch flow regulating valve 4 is connected to the fixed central heating circuit, and the mobile heating branch flow regulating valve 5 is connected to the quick connector 6 connected to the mobile heating device 7.

[0073] The steam outlet from the mobile heating device 7 is connected to the steam outlet regulating valve 9 through the outlet of the second desuperheater 8, and the steam outlet regulating valve 9 is connected to the inlets of a plurality of parallel steam silencers and heaters 10. The outlet of the water tank 12 is connected to the refrigeration system inlet regulating valve 13, and the cold water inlet regulating valve 10 is connected to the water tank 12. The silica gel-water adsorption refrigeration unit 14 is located on the other side of the heating circuit, and the silica gel-water adsorption refrigeration unit 14 includes the first adsorber 111 and the second adsorber 113, which are respectively connected to the evaporator 112 and the condenser 114. The evaporator 112 and the condenser 114 are connected through the valve 115 to realize fluid switching and circulation.

[0074] As shown in FIG. 1,

[0075] The gas turbine has the characteristics of quick start and stop and strong fuel adaptability, and is widely used in the fields of power generation and power grid peak shaving, etc. A large amount of waste heat cannot be effectively utilized in the start and stop process of the unit, but the steam parameters in the start and stop stage are unstable and cannot meet the 24-hour continuous central heating.

[0076] The application provides a comprehensive energy system based on mobile heating of a gas power plant.

[0077] Taking the "one-drag-one" starting stage of the gas turbine as an example, when the gas turbine starts, the hot re-steam of the intermediate-pressure boiler system in the gas turbine waste heat boiler is 0.015 MPa / 364 DEG C; when the turbine is rushed, the hot re-steam of the intermediate-pressure boiler system is 1.043 MPa / 551.6 DEG C; when the intermediate-pressure boiler system is closed, the hot re-steam is 0.707 MPa / 552.9 DEG C, and the duration from the start of the gas turbine to the closing of the intermediate-pressure boiler system is about 50 minutes. During this period, the hot re-steam enters the mobile heating device after temperature reduction, and the heat storage material in the mobile heating device is heated from room temperature to 300 DEG C, and the mobile heating device can release saturated steam above 0.7 MPa at the place of the off-site heat user. The steam after heat exchange with the mobile heating device enters the large pool after temperature and pressure reduction, and the water in the pool is heated to 60-90 DEG C, and the hot water enters the silica gel-water adsorption type cold water unit, and can output about 10 DEG C of chilled water. The comprehensive energy system based on mobile heating of the gas power plant realizes the combined supply of steam, hot water and chilled water.

[0078] The specific embodiments are only an explanation of the application, and are not a limitation of the application, and those skilled in the art can make modifications to the embodiments without creative contribution according to the needs after reading the specification, but as long as the modifications are within the scope of the claims of the application, they are protected by the patent law.

Claims

1. A comprehensive energy system based on mobile heating from a gas-fired power plant, characterized in that, include: Gas turbine waste heat boiler (1) is used to generate high-temperature steam; A main steam pipeline, the inlet of which is connected to the outlet of the gas turbine waste heat boiler (1), is provided with a steam header regulating valve (2) and a first-stage desuperheating and pressure reducing device (3) in sequence along the steam flow direction; a fixed heating branch, the inlet of which is connected to the outlet of the first-stage desuperheating and pressure reducing device (3), is provided with a centralized heating branch flow regulating valve (4); a mobile heating branch, the inlet of which is connected in parallel with the fixed heating branch to the outlet of the first-stage desuperheating and pressure reducing device (3), is provided with a mobile heating branch flow regulating valve (5) and a quick-connect interface (6) for connecting an external mobile heating device (7) in sequence along the steam flow direction; The heat utilization loop has its heat source input end connected to the steam outlet of the mobile heating device (7) through a secondary desuperheating and pressure reducing device (8). The waste heat utilization loop includes a steam silencer heater (11), a water tank (12), and a silica gel-water adsorption refrigeration unit (14). The steam inlet of the steam silencer heater (11) is connected to the outlet of the secondary desuperheater (8) through a steam outlet regulating valve (9). The heat exchange medium outlet of the steam silencer heater (11) is connected to the water tank (12). The outlet of the water tank (12) is connected to the heat source inlet of the silica gel-water adsorption refrigeration unit (14) through a refrigeration system inlet regulating valve (13).

2. The integrated energy system based on mobile heating from a gas-fired power plant according to claim 1, characterized in that, The steam silencer heater (11) is an energy-saving steam heater with multiple units arranged in parallel, used to increase the heat exchange area, improve the heat transfer rate and reduce the load of a single unit.

3. A comprehensive heating system based on mobile heating from a gas-fired power plant as described in claim 1. Energy system, characterized in that, The waste heat utilization circuit also includes a cold water inlet regulating valve (10), the outlet of which is connected to the water tank (12) to replenish cold water to the water tank (12) to maintain the system's thermal balance.

4. The integrated energy system based on mobile heating from a gas-fired power plant according to claim 1, characterized in that, The silica gel-water adsorption refrigeration unit (14) includes a first adsorber (111), a second adsorber (113), an evaporator (112), a condenser (114), and a valve (115) for controlling the fluid passage; the first adsorber (111) and the second adsorber (113) are alternately connected to the evaporator (112) and the condenser (114) by switching the valve (115) to realize the continuous operation of the adsorption-desorption cycle.

5. A comprehensive energy system based on mobile heating from a gas-fired power plant according to claim 4, characterized in that, The evaporator (112) is used to evaporate water under low pressure to absorb heat and generate cooling capacity; the condenser (114) is used to condense the water vapor generated by desorption into liquid water to achieve recycling.

6. The integrated energy system based on mobile heating from a gas-fired power plant according to claim 1, characterized in that, The quick-connector (6) is a connection device with quick alignment and sealing functions, used to realize quick and safe docking and media transmission between the mobile heating branch and the mobile heating device (7).

7. An operation method for an integrated energy system based on mobile heating from a gas-fired power plant as described in any one of claims 1 to 6, characterized in that, Includes the following steps: High-temperature steam generation step: High-temperature steam is generated by recovering the waste heat of the gas turbine exhaust gas through the gas turbine waste heat boiler (1); Steam distribution steps: via the steam header regulating valve (2) After the high-temperature steam is regulated and its parameters are initially adjusted by the first-stage desuperheating and pressure reducing device (3), the steam is selectively distributed to the fixed heating branch or the mobile heating branch by operating the centralized heating branch flow regulating valve (4) and the mobile heating branch flow regulating valve (5); Mobile heating step: When the steam is distributed to the mobile heating branch, the steam is transported to the mobile heating device (7) through the quick interface (6), and the mobile heating device (7) provides flexible heating; Waste heat cascade utilization step: The steam returned from the mobile heating device (7) is precisely adjusted by the second-stage desuperheating and pressure reducing device (8) and then enters the steam silencer heater (11) to heat the water in the water tank (12); The heated water is used as a driving heat source to enter the silica gel-water adsorption refrigeration unit (14) to generate cooling capacity and realize combined cooling and heating.

8. The operating method according to claim 7, characterized in that, In the waste heat utilization step, the steam flow rate entering the steam silencer heater (11) and the hot water flow rate entering the silica gel-water adsorption chiller (14) are controlled by adjusting the opening of the steam outlet regulating valve (9) and the refrigeration system inlet regulating valve (13) to adapt to different cooling and heating load requirements.

9. The operating method according to claim 7, characterized in that, The method is particularly suitable for the utilization of waste heat during the start-up and shutdown phases of gas turbines. It prioritizes the guidance of steam with unstable parameters during the start-up and shutdown process to the mobile heating branch and the waste heat utilization circuit, thereby achieving stable utilization and energy recovery of fluctuating heat sources.

10. The operating method according to claim 7, characterized in that, The method achieves a unified management of stable heating for users in fixed areas and flexible energy supply for decentralized and temporary users through the coordinated operation of the fixed heating branch and the mobile heating branch.

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