Power generation, heat storage and peak shaving system coupled with coal gas and flue gas conditioning and its operating method

Abstract

The application provides a power generation, heat storage and peak regulation system coupling coal gas and flue gas regulation and an operation method thereof.The power generation, heat storage and peak regulation system comprises a gas boiler with a boiler flue, an air preheater and a coal gas heater are arranged on the boiler flue and used for heat exchange with flue gas in the boiler flue; a heat storage medium heating furnace is connected with the outlet of the air preheater and the outlet of the coal gas heater respectively, and the heat storage medium heating furnace is provided with a first heat storage medium pipeline connected with a high-temperature storage tank and a low-temperature storage tank respectively; and a heat release heat exchanger is provided with a second heat storage medium pipeline connected with the high-temperature storage tank and the low-temperature storage tank respectively. The application can utilize the existing coal gas resource according to the need, store energy in the low electricity consumption period and release the energy for power generation in the high electricity consumption period, so that the electricity consumption load in the high peak period is reduced, and the electricity cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a power generation, heat storage and peak shaving system coupled with coal gas and flue gas regulation and an operating method thereof. BACKGROUND

[0002] Energy storage is a key supporting technology for energy revolution and is urgently needed to solve large-scale access of renewable energy and improve the efficiency of regional energy systems. In recent years, energy storage technology and industry have developed rapidly.

[0003] If the peak-valley industrial electricity pricing characteristics are combined, the existing coal gas resources are utilized by peak shaving and valley filling, more valley price electricity is purchased, less peak price electricity is purchased, and considerable economic benefits can be brought. At the same time, the influence of power curtailment on steel production during special period is reduced, the power supply for continuous production of steel plant is ensured, and the economic benefit of enterprise is greatly improved.

[0004] The existing coal gas power generation peak shaving system heats the low-temperature heat storage medium by electric heating, converts the electricity during the low electricity consumption period into heat in the heat storage medium, and the energy conversion efficiency is low. SUMMARY

[0005] The purpose of the present application is to provide a power generation, heat storage and peak shaving system coupled with coal gas and flue gas regulation and an operating method thereof, which utilizes the existing coal gas resources by "on-demand storage and release", stores energy during the low electricity consumption period and releases it during the high electricity consumption period for power generation to reduce the electricity consumption load during the high consumption period, thereby reducing the electricity cost.

[0006] In one aspect, the present application provides a power generation, heat storage and peak shaving system coupled with coal gas and flue gas regulation, which comprises:

[0007] A gas-fired boiler having a boiler flue, an air preheater and a coal gas heater being provided on the boiler flue for heat exchange with flue gas in the boiler flue;

[0008] A heat storage medium heating furnace, the outlet of the air preheater and the outlet of the coal gas heater being connected to the heat storage medium heating furnace, respectively, and the heat storage medium heating furnace being provided with a first heat storage medium pipeline connected to a high-temperature storage tank and a low-temperature storage tank, respectively;

[0009] A heat-releasing heat exchanger provided with a second heat storage medium pipeline connected to the high-temperature storage tank and the low-temperature storage tank, respectively.

[0010] In a preferred embodiment of the present application, an inlet pipeline connected to a water source or a steam source is connected to the inlet of the heat-releasing heat exchanger, and an outlet pipeline is connected between the outlet of the heat-releasing heat exchanger and a generator set.

[0011] In a preferred embodiment of the present application, a burner is arranged at the inlet of the heat storage medium heating furnace, and the hot air generated in the air preheater and the high-temperature coal gas generated in the coal gas heater are mixed in the burner and then burned in the heat storage medium heating furnace to generate high-temperature flue gas.

[0012] In a preferred embodiment of the present application, the flue gas outlet of the heat storage medium heating furnace is connected to the boiler flue through a flue gas pipeline.

[0013] In a preferred embodiment of the present application, a booster fan is arranged on the flue gas pipeline.

[0014] In a preferred embodiment of the present application, the denitration device, the economizer, the air preheater and the coal gas heater are arranged in the boiler flue in sequence along the flow direction of the flue gas.

[0015] In a preferred embodiment of the present application, the outlet of the flue gas pipeline is connected between the economizer and the air preheater, or the outlet of the flue gas pipeline is connected between the denitration device and the economizer, or the outlet of the flue gas pipeline is connected between the denitration device and the gas boiler.

[0016] In a preferred embodiment of the present application, a booster pump is arranged on each of the first heat storage medium pipeline and the second heat storage medium pipeline to drive the flow of the heat storage medium therein.

[0017] In a preferred embodiment of the present application, the heat storage medium in the high-temperature storage tank and the heat storage medium in the low-temperature storage tank are heat-conducting oil or molten salt.

[0018] In a preferred embodiment of the present application, saturated steam is supplied to the inlet of the heat-releasing heat exchanger, and a superheater is arranged in the heat-releasing heat exchanger and can exchange heat with the heat storage medium in the second heat storage medium pipeline.

[0019] In a preferred embodiment of the present application, saturated water is supplied to the inlet of the heat-releasing heat exchanger, and an evaporator and a superheater are arranged in the heat-releasing heat exchanger in sequence and can exchange heat with the heat storage medium in the second heat storage medium pipeline, respectively.

[0020] In a preferred embodiment of the present application, high-pressure water is supplied to the inlet of the heat-releasing heat exchanger, and a preheater, an evaporator and a superheater are arranged in the heat-releasing heat exchanger in sequence and can exchange heat with the heat storage medium in the second heat storage medium pipeline, respectively.

[0021] In a preferred embodiment of the present application, a steam drum is further arranged in the heat-releasing heat exchanger, and the steam drum is connected to the outlet of the preheater, the inlet of the evaporator, the outlet of the evaporator, and the inlet of the superheater, respectively.

[0022] In another aspect, the present application further provides an operation method of the power generation and thermal storage peak regulation system coupled with gas and flue gas regulation, which is implemented by using the power generation and thermal storage peak regulation system coupled with gas and flue gas regulation as described above, and the operation method comprises the following steps:

[0023] In the off-peak period of electricity consumption, the hot air generated in the air preheater and the high-temperature coal gas generated in the coal gas heater are combusted in the thermal storage medium heating furnace to generate high-temperature flue gas;

[0024] In the off-peak period of electricity consumption, the hot air generated in the air preheater and the high-temperature coal gas generated in the coal gas heater are combusted in the thermal storage medium heating furnace to generate high-temperature flue gas;

[0025] In a preferred embodiment of the present application, the operation method further comprises:

[0026] In the peak period of electricity consumption, the high-temperature thermal storage medium in the high-temperature storage tank is heated in the heat-releasing heat exchanger with water or steam through the second thermal storage medium pipeline to generate low-temperature thermal storage medium and enter the low-temperature storage tank, and the superheated steam generated by heat exchange in the heat-releasing heat exchanger is used for steam power generation.

[0027] Compared with the prior art, the present application has the following characteristics and advantages:

[0028] The power generation and thermal storage peak regulation system coupled with gas and flue gas regulation can heat the thermal storage medium by using the heat energy generated by the combustion of coal gas in the off-peak period of electricity consumption, and the energy is stored in the high-temperature storage tank in the form of heat energy. In the peak period of electricity consumption, the energy in the thermal storage medium is released to increase the supply of electricity or steam, which is beneficial to the regional power grid load regulation, improves the energy utilization rate, and has good social benefits.

[0029] The power generation and thermal storage peak regulation system coupled with gas and flue gas regulation utilizes the air preheater and the coal gas heater on the boiler flue to realize the coupling and regulation of coal gas and flue gas, fully utilizes the original boiler waste heat recovery system and flue gas treatment device, and the thermal storage medium heating furnace does not need to be separately provided with an air blower and an air preheater.

[0030] The power generation and thermal storage peak regulation system coupled with gas and flue gas regulation has a wide regulation range, stable performance, simple system structure, and stable reliability, saves investment, and improves the energy utilization rate in the thermal storage process. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort. In the drawings:

[0032] The drawings described herein are only for illustrative purposes, and are not intended to limit the scope of the present application in any way. In addition, the shapes and scale sizes of the components in the drawings are only illustrative, and are used to help understand the present application, and are not specific limitations on the shapes and scale sizes of the components of the present application. Those skilled in the art can select various possible shapes and scale sizes to implement the present application according to specific circumstances under the guidance of the present application.

[0033] Figure 1 Structure schematic diagram of the coupling coal gas and flue gas regulation power generation heat storage peak shaving system according to the present application;

[0034] Figure 2 Another structure schematic diagram of the coupling coal gas and flue gas regulation power generation heat storage peak shaving system according to the present application;

[0035] Figure 3 Still another structure schematic diagram of the coupling coal gas and flue gas regulation power generation heat storage peak shaving system according to the present application;

[0036] Figure 4 Another structure schematic diagram of the coupling coal gas and flue gas regulation power generation heat storage peak shaving system according to the present application;

[0037] Figure 5 Internal structure schematic diagram of the heat releasing heat exchanger according to the present application;

[0038] Figure 6 Another internal structure schematic diagram of the heat releasing heat exchanger according to the present application.

[0039] Explanation of the reference numerals:

[0040] 10, gas boiler; 11, boiler flue; 12, denitration device; 13, coal economizer; 14, air preheater; 15, coal gas heater; 16, chimney;

[0041] 20, heat storage medium heating furnace; 21, burner;

[0042] 30, heat releasing heat exchanger; 31, preheater; 32, evaporator; 33, superheater; 34, steam drum;

[0043] 40, gas pipeline; 41, hot air pipeline; 42, first heat storage medium pipeline; 43, second heat storage medium pipeline; 44, flue gas pipeline; 441, booster fan; 45, inlet pipeline; 46, outlet pipeline;

[0044] 50, low-temperature storage tank; 51, high-temperature storage tank; 52, first pressure pump; 53, second pressure pump. DETAILED DESCRIPTION

[0045] In order to make the personnel in the technical field better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with 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 of ordinary skill in the art without creative work should belong to the scope of protection of the present application.

[0046] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be limiting.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0048] The purpose of the present application is to provide a power generation and heat storage peak shaving system coupled with gas and flue gas regulation and an operating method thereof, which utilizes existing gas resources "on-demand storage and release", stores energy during low electricity consumption periods and releases it for power generation during peak electricity consumption periods to reduce peak electricity consumption load and in turn reduce electricity cost.

[0049] Embodiment one:

[0050] As Figure 1As shown, the application provides a power generation heat storage peak shaving system coupled with gas and flue gas regulation, which comprises: a gas-fired boiler 10 having a boiler flue 11, the boiler flue 11 being provided with an air preheater 14 and a gas heater 15 for heat exchange with flue gas in the boiler flue 11; a heat storage medium heating furnace 20, the outlet of the air preheater 14 and the outlet of the gas heater 15 being connected with the heat storage medium heating furnace 20 respectively, the heat storage medium heating furnace 20 being provided with a first heat storage medium pipeline 42 connected with a high-temperature storage tank 51 and a low-temperature storage tank 50 respectively; and a heat release heat exchanger 30 provided with a second heat storage medium pipeline 43 connected with the high-temperature storage tank 51 and the low-temperature storage tank 50 respectively.

[0051] The power generation heat storage peak shaving system coupled with gas and flue gas regulation can heat the heat storage medium by using the heat energy generated by gas combustion during the off-peak period of electricity consumption, and the energy is stored in the high-temperature storage tank 51 in the form of heat energy; the energy in the heat storage medium is released during the peak period of electricity consumption, thereby increasing the supply of electricity or steam, which is beneficial to regional power grid load regulation and improves energy utilization and has good social benefits.

[0052] The power generation heat storage peak shaving system coupled with gas and flue gas regulation utilizes the air preheater 14 and the gas heater 15 on the boiler flue 11 to realize the regulation mode of coupling of gas and flue gas, fully utilizes the original boiler waste heat recovery system and flue gas treatment device, and the heat storage medium heating furnace 20 does not need to be separately provided with a blower and an air preheater 14.

[0053] The power generation heat storage peak shaving system coupled with gas and flue gas regulation has a wide regulation range, stable performance, simple system structure, stability and reliability, saves investment, and improves the energy utilization rate during the heat storage process.

[0054] The gas-fired boiler 10 is a common combustion heating device in a power generation system, which heats water into steam by using the heat energy generated by gas combustion, and then the steam is used for power generation in a steam turbine generator set. With the gradual improvement of social productivity, the demand for industrial electricity consumption also gradually increases; in the case that the power of the gas-fired boiler 10 is limited, the steam generated by the gas-fired boiler 10 alone cannot effectively meet the electricity demand during the peak period of electricity consumption. Therefore, an energy storage device is usually provided in the entire power generation system, and the energy storage device releases the heat energy stored in advance in the energy storage device during the peak period of electricity consumption, thereby generating sufficient steam to meet the electricity demand during the peak period.

[0055] In the power generation heat storage peak shaving system coupled with gas and flue gas regulation, the charging process of the energy storage device is set in the off-peak period of electricity consumption, and the energy storage device is charged by using the heat energy generated by the combustion of the gas heated by heat exchange through the boiler flue 11, thereby improving the energy utilization rate.

[0056] Specifically, as shown in Figure 1 The gas boiler 10 has a boiler flue 11, in which the high-temperature flue gas generated by the combustion of coal gas is subjected to heat exchange to generate water vapor for power generation. Along the flow direction of the flue gas in the boiler flue 11, the boiler flue 11 is sequentially provided with an air preheater 14 and a coal gas heater 15 for heat exchange with the flue gas in the boiler flue 11. The gas boiler 10 is a combustion boiler commonly used in the field of thermal power generation, and its specific structure will not be described in detail here.

[0057] The inlet of the air preheater 14 is connected with the atmosphere, and the air entering the air preheater 14 is subjected to heat exchange with the flue gas in the boiler flue 11 to generate hot air. The hot air flows out through the outlet of the air preheater 14. The inlet of the coal gas heater is connected with a coal gas pipeline 40, which can be the original main coal gas pipeline in the boiler generator set. The coal gas entering the coal gas heater 15 is subjected to heat exchange with the flue gas in the boiler flue 11 to generate high-temperature coal gas. The high-temperature coal gas flows out through the outlet of the coal gas heater 15.

[0058] The inlet of the heat storage medium heater 20 is connected with the outlet of the coal gas heater 15 through the coal gas pipeline 40, and the high-temperature coal gas generated in the coal gas heater 15 can enter the heat storage medium heater 20 through the coal gas pipeline 40. The inlet of the heat storage medium heater 20 is connected with the outlet of the air preheater 14 through the hot air pipeline 41, and the hot air generated in the air preheater 14 can enter the heat storage medium heater 20 through the hot air pipeline 41. The high-temperature coal gas and the hot air mixed and contacted in the heat storage medium heater 20 are combusted and released heat.

[0059] Further, the first heat storage medium pipeline 42 is arranged in the heat storage medium heater 20, and the two ends of the first heat storage medium pipeline 42 are connected with the low-temperature storage tank 50 and the high-temperature storage tank 51, respectively, after penetrating the side wall of the heat storage medium heater 20. The low-temperature storage tank 50 stores low-temperature heat storage medium, and the high-temperature storage tank 51 stores high-temperature heat storage medium. The heat storage medium can flow from the low-temperature storage tank 50 to the high-temperature storage tank 51 along the first heat storage medium pipeline 42.

[0060] In the process of operation of the heat storage medium heating furnace 20, that is, when the high-temperature coal gas is combusted in the heat storage medium heating furnace 20, the low-temperature heat storage medium in the low-temperature storage tank 50 enters the first heat storage medium pipeline 42 and is heated and warmed up in the heat storage medium heating furnace 20 to generate high-temperature heat storage medium, and the high-temperature heat storage medium generated after heat exchange enters the high-temperature storage tank 51 through the first heat storage medium pipeline 42 and is stored in the high-temperature storage tank 51. After the above process, part of the waste heat of the flue gas in the boiler flue 11 and the heat generated by the combustion of the high-temperature coal gas are stored in the high-temperature heat storage medium in the high-temperature storage tank 51. It should be noted that the above process is usually carried out during the off-peak period of electricity, that is, part of the waste heat of the flue gas and the combustion heat are stored in the heat storage medium during the period when the load of the boiler generator set is low.

[0061] The second heat storage medium pipeline 43 is further connected between the high-temperature storage tank 51 and the low-temperature storage tank 50, and the heat storage medium can flow from the high-temperature storage tank 51 to the low-temperature storage tank 50 along the second heat storage medium pipeline 43. The second heat storage medium pipeline 43 is provided with a heat-releasing heat exchanger 30 capable of exchanging heat with the heat storage medium flowing in the pipeline.

[0062] During the peak period of electricity, that is, during the period when the load of the boiler generator set is large, the high-temperature heat storage medium in the high-temperature storage tank 51 can enter the heat-releasing heat exchanger 30 through the second heat storage medium pipeline 43 to release heat and be cooled, thereby generating steam for power generation in the heat-releasing heat exchanger 30, and the low-temperature heat storage medium generated after heat exchange flows back into the low-temperature storage tank 50 through the second heat storage medium pipeline 43. After the above process, the energy stored in the high-temperature heat storage medium is transferred to the steam that can be directly used for power generation, thereby increasing the supply amount of the steam to meet the power supply amount during the peak period of electricity.

[0063] The structure and technical effects of the preferred embodiment of the power generation heat storage peak regulation system coupled with coal gas and flue gas regulation will be further described below.

[0064] According to one embodiment of the present application, as shown in Figure 1 The inlet pipeline 45 of the heat-releasing heat exchanger 30 is connected with an inlet pipeline 45 connected with a water source or a steam source, and the outlet of the heat-releasing heat exchanger 30 is connected with a generator set through an outlet pipeline 46.

[0065] The inlet pipeline 45 provides water or steam for heat exchange in the heat-releasing heat exchanger 30, and the water or steam absorbs heat in the heat-releasing heat exchanger 30 to form superheated steam and enters the generator set through the outlet pipeline 46 to generate power, thereby converting the heat energy stored in the high-temperature heat storage medium into electric energy.

[0066] According to one embodiment of the present application, as shown in Figure 1As shown, the inlet of the heat storage medium heating furnace 20 is provided with a burner 21, and the hot air generated in the air preheater 14 and the high-temperature coal gas generated in the coal gas heater 15 are mixed in the burner 21 and then enter the heat storage medium heating furnace 20 to generate high-temperature flue gas.

[0067] Specifically, the burner 21 has an air side interface and a fuel side interface, which are connected with the outlet of the hot air pipeline 41 and the outlet of the coal gas pipeline 40 respectively, and the hot air in the hot air pipeline 41 enters the heat storage medium heating furnace 20 together with the high-temperature coal gas in the coal gas pipeline 40 after passing through the burner 21, and the hot air assists the high-temperature coal gas to fully burn in the hearth of the heat storage medium heating furnace 20.

[0068] Preferably, the hot air pipeline 41 is provided with an adjusting valve for adjusting the opening degree of the pipeline, and the flow of the hot air is controlled by the adjusting valve, so as to control the burning speed of the high-temperature coal gas in the heat storage medium heating furnace 20.

[0069] According to one embodiment of the present application, as shown in Figure 1 As shown, the flue gas outlet of the heat storage medium heating furnace 20 is connected with the boiler flue 11 through a flue gas pipeline 44.

[0070] Specifically, the flue gas generated by the high-temperature coal gas burning in the heat storage medium heating furnace 20 can flow into the boiler flue 11 through the flue gas pipeline 44, so as to avoid air pollution caused by direct emission of the flue gas generated by the heat storage medium heating furnace 20.

[0071] According to one embodiment of the present application, as shown in Figure 2 As shown, the flue gas pipeline 44 is provided with a booster fan 441. The flow rate of the flue gas in the flue gas pipeline 44 is controlled by the booster fan 441, so as to improve the adjustment performance of the whole system.

[0072] According to one embodiment of the present application, as shown in Figure 1 As shown, along the flow direction of the flue gas in the boiler flue 11, the boiler flue 11 is sequentially provided with a denitration device 12, an economizer 13, an air preheater 14 and a coal gas heater 15. The denitration device 12 is used for denitration treatment of the flue gas in the boiler flue 11, and the economizer 13, the air preheater 14 and the coal gas heater 15 can all exchange heat with the flue gas in the boiler flue 11, so as to realize recovery of the flue gas waste heat.

[0073] Further, the end of the boiler flue 11 is provided with a chimney 16, and the flue gas in the boiler flue 11 after denitration and waste heat recovery can be discharged into the atmosphere through the chimney 16.

[0074] According to one embodiment of the present application, as shown in Figure 1 and Figure 2As shown, the outlet of the flue gas pipeline 44 is connected between the economizer 13 and the air preheater 14; or, as shown, the outlet of the flue gas pipeline 44 is connected between the denitration device 12 and the economizer 13; or, as shown, the outlet of the flue gas pipeline 44 is connected between the denitration device 12 and the gas boiler 10. Figure 3 As shown, the outlet of the flue gas pipeline 44 is connected between the economizer 13 and the air preheater 14; or, as shown, the outlet of the flue gas pipeline 44 is connected between the denitration device 12 and the economizer 13; or, as shown, the outlet of the flue gas pipeline 44 is connected between the denitration device 12 and the gas boiler 10. Figure 4 As shown, the outlet of the flue gas pipeline 44 is connected between the economizer 13 and the air preheater 14; or, as shown, the outlet of the flue gas pipeline 44 is connected between the denitration device 12 and the economizer 13; or, as shown, the outlet of the flue gas pipeline 44 is connected between the denitration device 12 and the gas boiler 10.

[0075] As shown, the outlet of the flue gas pipeline 44 is connected between the economizer 13 and the air preheater 14; or, as shown, the outlet of the flue gas pipeline 44 is connected between the denitration device 12 and the economizer 13; or, as shown, the outlet of the flue gas pipeline 44 is connected between the denitration device 12 and the gas boiler 10.

[0076] As shown, the outlet of the flue gas pipeline 44 is connected between the economizer 13 and the air preheater 14; or, as shown, the outlet of the flue gas pipeline 44 is connected between the denitration device 12 and the economizer 13; or, as shown, the outlet of the flue gas pipeline 44 is connected between the denitration device 12 and the gas boiler 10. Figure 1 As shown, the outlet of the flue gas pipeline 44 is connected between the economizer 13 and the air preheater 14; or, as shown, the outlet of the flue gas pipeline 44 is connected between the denitration device 12 and the economizer 13; or, as shown, the outlet of the flue gas pipeline 44 is connected between the denitration device 12 and the gas boiler 10.

[0077] The first heat storage medium pipeline 42 at the outlet of the low-temperature storage tank 50 is provided with a first pressurizing pump 52, which provides power for the flow of the heat storage medium in the first heat storage medium pipeline 42. The second heat storage medium pipeline 43 at the outlet of the high-temperature storage tank 51 is provided with a second pressurizing pump 53, which provides power for the flow of the heat storage medium in the second heat storage medium pipeline 43.

[0078] According to an embodiment of the present application, the heat storage medium in the high-temperature storage tank 51 and the heat storage medium in the low-temperature storage tank 50 are heat-conducting oil or molten salt.

[0079] According to an embodiment of the present application, the inlet of the heat-releasing heat exchanger 30 is provided with saturated steam, and the heat-releasing heat exchanger 30 is provided with a superheater 33 capable of exchanging heat with the heat storage medium in the second heat storage medium pipeline 43.

[0080] Specifically, the inlet of the superheater 33 is connected with an inlet pipeline 45, the inlet pipeline 45 is provided with saturated steam, and the saturated steam entering the superheater 33 can exchange heat with the high-temperature heat storage medium in the second heat storage medium pipeline 43 to generate superheated steam; the outlet of the superheater 33 is connected with an outlet pipeline 46, and the superheated steam generated in the superheater 33 can enter the power generator set through the outlet pipeline 46 for power generation.

[0081] According to an embodiment of the present application, the inlet of the heat-releasing heat exchanger 30 is provided with saturated water, and the heat-releasing heat exchanger 30 is provided with an evaporator 32 and a superheater 33 connected in series and capable of exchanging heat with the heat storage medium in the second heat storage medium pipeline 43, respectively.

[0082] Specifically, the inlet of the evaporator 32 is connected with the inlet pipeline 45, the saturated water in the inlet pipeline 45 exchanges heat with the high-temperature heat storage medium in the second heat storage medium pipeline 43 to generate saturated steam; the outlet of the evaporator 32 is connected with the inlet of the superheater 33, the saturated steam generated in the evaporator 32 enters the superheater 33 and exchanges heat with the high-temperature heat storage medium in the second heat storage medium pipeline 43 to generate superheated steam; the outlet of the superheater 33 is connected with the outlet pipeline 46, and the superheated steam generated in the superheater 33 can enter the generator set through the outlet pipeline 46 for power generation.

[0083] According to one embodiment of the present application, as shown in Figure 5 The inlet of the heat-releasing heat exchanger 30 is connected with the high-pressure water pipeline 44, and the preheater 31, the evaporator 32 and the superheater 33 are sequentially and serially arranged in the heat-releasing heat exchanger 30 and can exchange heat with the heat storage medium in the second heat storage medium pipeline 43.

[0084] Specifically, the inlet of the evaporator 32 is connected with the inlet pipeline 45, the saturated water in the inlet pipeline 45 exchanges heat with the high-temperature heat storage medium in the second heat storage medium pipeline 43 to generate saturated steam; the outlet of the evaporator 32 is connected with the inlet of the superheater 33, the saturated steam generated in the evaporator 32 enters the superheater 33 and exchanges heat with the high-temperature heat storage medium in the second heat storage medium pipeline 43 to generate superheated steam; the outlet of the superheater 33 is connected with the outlet pipeline 46, and the superheated steam generated in the superheater 33 can enter the generator set through the outlet pipeline 46 for power generation.

[0085] Further, as shown in Figure 6 The heat-releasing heat exchanger 30 further comprises a steam drum 34, and the steam drum 34 is connected with the outlet of the preheater 31, the inlet of the evaporator 32, the outlet of the evaporator 32 and the inlet of the superheater 33.

[0086] Specifically, the saturated water generated after being heated by the preheater 31 first enters the steam drum 34, the saturated water in the steam drum 34 flows into the evaporator 32 to be continuously heated into saturated steam-water mixture, and then returns to the steam drum 34 to complete steam-water separation, and the separated saturated steam enters the superheater 33 to be heated into superheated steam.

[0087] Embodiment two:

[0088] The present application further provides an operation method of the power generation and heat storage peak regulation system coupled with coal gas and flue gas regulation, and the operation method is implemented by using the power generation and heat storage peak regulation system coupled with coal gas and flue gas regulation according to the embodiment one, and the operation method comprises the following steps.

[0089] In the off-peak period, the hot air generated in the air preheater 14 and the high-temperature gas generated in the gas heater 15 are combusted in the heat storage medium heating furnace 20 to generate high-temperature flue gas; the low-temperature storage tank 50 is opened, and the low-temperature heat storage medium in the low-temperature storage tank 50 is heated in the heat storage medium heating furnace 20 through the first heat storage medium pipeline 42 to generate high-temperature heat storage medium and enter the high-temperature storage tank 51.

[0090] In the off-peak period, such as at night, the flue gas generated in the gas boiler 10 can meet the electricity demand, but the flue gas waste heat utilization efficiency of the gas boiler 10 is low due to the low electricity demand in this period; at this time, the flue gas waste heat in the boiler flue 11 is recovered through the air preheater 14 and the gas heater 15, and high-temperature gas and hot air are introduced into the heat storage medium heating furnace 20, the high-temperature gas and hot air are combusted and released heat in the heat storage medium heating furnace 20, and at the same time, the low-temperature storage tank 50 is opened, the low-temperature heat storage medium is sent into the heat storage medium heating furnace 20 through the first pressurizing pump 52, and the low-temperature heat storage medium exchanges heat with the flue gas generated by the combustion of high-temperature gas to generate high-temperature heat storage medium and store in the high-temperature storage tank 51, so as to store part of the excess heat in the boiler flue 11 and the heat generated by the combustion of gas in the heat storage medium.

[0091] Further, the operation method of the coupled gas and flue gas regulated power generation and heat storage peak shaving system further comprises: in the peak period, the high-temperature storage tank 51 is opened, the high-temperature heat storage medium in the high-temperature storage tank 51 exchanges heat with the water or steam in the heat release heat exchanger 30 to generate low-temperature heat storage medium and enter the low-temperature storage tank 50, and the superheated steam generated by the heat exchange in the heat release heat exchanger 30 is used for steam power generation.

[0092] In the peak period, such as during the day, the electricity demand is large, and the flue gas generated in the gas boiler 10 cannot meet the electricity demand; at this time, the high-temperature storage tank 51 is opened, the high-temperature heat storage medium is sent into the heat release heat exchanger 30 through the second pressurizing pump 53, the water or steam in the heat release heat exchanger 30 exchanges heat with the high-temperature heat storage medium to generate superheated steam, the heat energy stored in the high-temperature heat storage medium is released, the generated superheated steam is introduced into the generator set for power generation, and the electricity demand during the day is met.

[0093] The above specific embodiments further illustrate the purpose, technical solutions and advantages of the present application, and it should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A power generation, heat storage and peak shaving system coupled with gas and flue gas conditioning, characterized in that, include: A gas-fired boiler having a boiler flue, wherein an air preheater and a gas heater are provided on the boiler flue for exchanging heat with the flue gas in the boiler flue. The heat storage medium heater is provided with the outlet of the air preheater and the outlet of the gas heater connected to the heat storage medium heater respectively. The heat storage medium heater is provided with a first heat storage medium pipeline connected to a high temperature storage tank and a low temperature storage tank respectively. The flue gas outlet of the heat storage medium heater is connected to the boiler flue through the flue gas pipeline. A heat exchanger containing a second heat storage medium pipeline that is connected to the high-temperature storage tank and the low-temperature storage tank respectively; The inlet of the heat exchanger is connected to an inlet pipe that is connected to a water source or a steam source, and the outlet of the heat exchanger is connected to a generator set through an outlet pipe.

2. The cogeneration system of claim 1, wherein, A burner is provided at the inlet of the heat storage medium heating furnace. The hot air generated in the air preheater and the high-temperature gas generated in the gas heater are mixed in the burner and then burned in the heat storage medium heating furnace to produce high-temperature flue gas.

3. The cogeneration system of claim 1, wherein, A booster fan is installed on the flue gas duct.

4. The cogeneration system of claim 1, wherein, Along the flow direction of the flue gas in the boiler flue, a denitrification device, an economizer, an air preheater, and a gas heater are sequentially installed in the boiler flue.

5. The cogeneration system of claim 4, wherein, The outlet of the flue gas duct is connected between the economizer and the air preheater; or, the outlet of the flue gas duct is connected between the denitrification device and the economizer; or, the outlet of the flue gas duct is connected between the denitrification device and the gas boiler.

6. The cogeneration system of claim 1, wherein, Both the first and second heat storage medium pipes are equipped with pressure pumps to drive the flow of the heat storage medium within them.

7. The cogeneration system of claim 6, wherein, The heat storage medium in the high-temperature storage tank and the heat storage medium in the low-temperature storage tank are heat transfer oil or molten salt.

8. The cogeneration system of claim 1, wherein, The inlet of the heat exchanger is supplied with saturated steam, and the heat exchanger is equipped with a superheater that can exchange heat with the heat storage medium in the second heat storage medium pipeline.

9. The cogeneration system of claim 1, wherein, The inlet of the heat exchanger is filled with saturated water, and the heat exchanger contains an evaporator and a superheater connected in series and capable of exchanging heat with the heat storage medium in the second heat storage medium pipeline.

10. The cogeneration system of claim 1, wherein, The inlet of the heat exchanger is supplied with high-pressure water, and the heat exchanger is equipped with a preheater, an evaporator and a superheater that are connected in series and can exchange heat with the heat storage medium in the second heat storage medium pipeline.

11. The cogeneration system of claim 10, wherein, The heat exchanger is also equipped with a steam drum, which is connected to the outlet of the preheater, the inlet of the evaporator, the outlet of the evaporator, and the inlet of the superheater.

12. A method of operating a power storage and peak shaving system coupled with coal gas and flue gas conditioning, the method comprising: The operation method is implemented using the power generation, thermal storage, and peak-shaving system with coupled coal gas and flue gas regulation as described in any one of claims 1-11. The operation method includes: During periods of low electricity demand, the hot air generated in the air preheater and the high-temperature coal gas generated in the gas heater are burned in the heat storage medium heater to produce high-temperature flue gas. When the cryogenic storage tank is opened, the cryogenic heat storage medium inside is heated in the heat storage medium heating furnace through the first heat storage medium pipeline to generate a high-temperature heat storage medium, which then enters the high-temperature storage tank.

13. The operation method of the power generation, thermal storage, and peak-shaving system with coupled coal gas and flue gas regulation according to claim 12, characterized in that, The operation method further includes: In the power consumption peak time period, the high-temperature storage tank is opened, the high-temperature heat storage medium in the high-temperature storage tank exchanges heat with water or water vapor in the second heat storage medium pipeline in the heat releasing heat exchanger to generate low-temperature heat storage medium and enter the low-temperature storage tank, and the superheated steam generated by heat exchange in the heat releasing heat exchanger is used for steam power generation.

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