Thermal power generating unit peak regulation system based on hydrogen energy coupling

Abstract

The invention provides a thermal power generating unit peak regulation system based on hydrogen energy coupling, the thermal power generating unit peak regulation system comprises a thermal power module, an electrolytic hydrogen production module, an oxygen storage module, a hydrogen storage module and a hydrogen power module, redundant electric energy of the thermal power module is transmitted to the electrolytic hydrogen production module to prepare hydrogen and oxygen, and the oxygen enters an oxygen storage tank to be stored after being dehydrated. Hydrogen is dehydrated and then passes through the first hydrogen storage tank and the second hydrogen storage tank, oxygen in the oxygen storage tank and low-pressure hydrogen in the first hydrogen storage tank can be used for combustion supporting of the coal-fired boiler, and hydrogen energy is mixed for combustion to achieve carbon emission reduction. High-pressure hydrogen in the second hydrogen storage tank can be conveyed to a hydrogen refueling station or a hydrogen energy fuel cell for power generation, electric energy generated by power generation of the hydrogen energy fuel cell is conveyed to a power grid, and therefore coupling peak regulation of thermal power and hydrogen energy is achieved. By means of the arrangement, low-carbon power generation is achieved, economic benefits of a thermal power plant are improved, and maximization of electricity market benefits is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal power generation units, and in particular relates to a thermal power generation unit peak regulation system based on hydrogen energy coupling. Background Art

[0002] With the development of new energy technologies and the increase in demand, wind power and solar power generation have been greatly improved year by year in terms of total installed capacity and power generation, which has led to a great change in the electricity consumption structure of factories and residents, and the difference between the peak and valley of the power grid is increasing. With the rapid increase in the power generation of new energy such as wind power and photovoltaic power, the demand for the peak-shaving capacity and operation flexibility of thermal power units is getting higher and higher. However, due to the limitations of the minimum stable combustion load of thermal power units, the depth of large thermal power units participating in peak-shaving is limited, which will bring a large operating cost burden to traditional thermal power companies. Therefore, it is an urgent problem to study how to couple new energy with power generation in thermal power plants and involve new energy in the deep peak-shaving of thermal power units. Summary of the invention

[0003] The present invention provides a peak-shaving system for thermal power units based on hydrogen energy coupling, aiming to solve the problems in the prior art that thermal power units are subject to limitations such as minimum stable combustion load, and when the power generation of new energy is large, their own peak-shaving depth is limited and the operating cost is high.

[0004] To achieve the above object, the technical solution adopted by the present invention is: to provide a peak load regulation system of a thermal power unit based on hydrogen energy coupling, comprising: A thermal power module, comprising a coal-fired boiler and a thermal power unit, wherein the thermal power unit is connected to the coal-fired boiler, and the thermal power unit has a first power generation output end and a second power generation output end, wherein the first power generation output end is connected to a power grid; An electrolysis hydrogen production module, connected to the second power generation output end, for electrolyzing water to produce oxygen and hydrogen; An oxygen storage module, comprising an oxygen dehydration device and an oxygen storage tank, wherein the input end of the oxygen dehydration device is connected to the oxygen output end of the electrolytic hydrogen production module, and the output end of the oxygen dehydration device is connected to the oxygen storage tank; A hydrogen storage module, comprising a hydrogen dehydration device, a first hydrogen storage tank and a second hydrogen storage tank, wherein the input end of the hydrogen dehydration device is connected to the hydrogen output end of the electrolytic hydrogen production module, the output end of the hydrogen dehydration device is connected to the input end of the first hydrogen storage tank, the output end of the first hydrogen storage tank is connected to the input end of the second hydrogen storage tank, and a compressor is further provided between the output end of the first hydrogen storage tank and the input end of the second hydrogen storage tank; and The hydrogen power module comprises a hydrogen fuel cell connected to the output end of the hydrogen storage device, wherein the hydrogen fuel cell has a third power generation output end connected to the power grid.

[0005] In a possible implementation, the hydrogen dehydration device includes a shell, and a molecular sieve dehydration unit arranged in the shell, the shell is provided with a hydrogen inlet, a hydrogen outlet, a regeneration gas inlet and a regeneration gas outlet, the hydrogen inlet is connected to the hydrogen output end of the electrolysis hydrogen production module, and the hydrogen outlet is connected to the input end of the first hydrogen storage tank; The hydrogen dehydration device has a dehydration state and a regeneration state. When in the dehydration state, the hydrogen inlet and the hydrogen outlet are connected. When in the regeneration state, the regeneration gas inlet and the regeneration gas outlet are connected. Two hydrogen dehydration devices are provided, and the two hydrogen dehydration devices alternately switch between the dehydration state and the regeneration state.

[0006] In a possible implementation, the shell is a rectangular shell member, the hydrogen inlet and the hydrogen outlet are respectively provided on two side walls of the shell in the direction of the long axis, and the regeneration gas inlet and the regeneration gas outlet are respectively provided on two side walls of the shell in the direction of the short axis; the regeneration gas outlet and the regeneration gas inlet are respectively provided with a plurality of regeneration gas outlets and a plurality of regeneration gas inlets at intervals along the long axis of the shell, and the regeneration gas outlets and the regeneration gas inlets correspond one to one in the direction of the short axis of the shell; The molecular sieve dehydration unit is provided with a plurality of molecular sieve dehydration units, and the plurality of molecular sieve dehydration units are arranged at intervals along the long axis direction of the shell and can slide along the long axis direction of the shell; the molecular sieve dehydration unit comprises a frame body and a molecular sieve filler arranged in the frame body, and the frame body is provided with a first inlet and a first outlet on both side walls along the long axis direction of the shell, and the frame body is provided with a second inlet and a second outlet on both side walls along the short axis direction of the shell; When the hydrogen dehydration device is in the dehydration state, the multiple molecular sieve dehydration units in the housing are butted end to end, and the first outlet of the previous molecular sieve dehydration unit is connected to the first inlet of the next molecular sieve dehydration unit; When the hydrogen dehydration device is in the regeneration state, the molecular sieve dehydration units in the housing are spaced apart by a preset distance, the second inlet of the molecular sieve dehydration unit is connected to the corresponding regeneration gas inlet, and the second outlet of the molecular sieve dehydration unit is connected to the corresponding regeneration gas outlet.

[0007] In a possible implementation, the first inlet and the first outlet are arranged alternately up and down, and when the hydrogen dehydration device is in the dehydration state, the plurality of molecular sieve dehydration units can form a tortuous dehydration channel.

[0008] In a possible implementation, the bottom wall of the shell is provided with a slide groove along its long axis direction, and the frame body is slidably matched with the slide groove. The hydrogen dehydration device also includes a scissor-fork mechanism, and the scissor-fork mechanism is telescopically arranged inside the shell along the long axis direction of the shell, and the multiple frames are arranged one-to-one correspondingly on the multiple hinge shafts of the scissor-fork mechanism.

[0009] In a possible implementation, a plurality of avoidance holes are provided at intervals on the top of the shell along the long axis direction of the shell, the hydrogen dehydration device further comprises a heating plate and a lifting mechanism, a plurality of the heating plates and the lifting mechanism are provided respectively, the plurality of the heating plates are arranged at intervals along the long axis direction of the shell, at least one heating plate is provided on both sides of each of the molecular sieve dehydration units, the heating plates are arranged in the avoidance holes one by one, the lifting mechanism is used to drive the corresponding heating plates to rise and fall vertically, a heat exchange hole is provided on the side wall of the frame adjacent to the heating plate, the heat exchange hole penetrates the wall thickness of the frame; wherein the heat exchange holes of the front and rear frames are staggered so that when the two frames are butted end to end, the heat exchange holes on the mating surfaces of the two frames are both closed.

[0010] In a possible implementation, a first sealing plate is provided on the top of the heating plate, and a second sealing plate is provided on the bottom of the heating plate. When the heating plate is at the upper dead point, the first sealing plate abuts against the top wall of the inner cavity of the shell to seal the avoidance hole. When the heating plate is at the lower dead point, the second sealing plate abuts against the top wall of the outer side of the shell to seal the avoidance hole.

[0011] In a possible implementation, the top of the frame is open, and the molecular sieve dehydration unit further includes a cover mechanism, and the cover mechanism includes: An upper cover is arranged at the top opening of the frame body, the interior of the upper cover is hollow to form an adjustment cavity, and the bottom of the upper cover is provided with an adjustment hole connected with the adjustment cavity; A pressing plate, comprising an upper plate body, a lower plate body and a connecting rod, wherein the upper plate body is accommodated in the adjusting cavity, the lower plate body is located below the upper cover, and the connecting rod is connected to the upper plate body and the lower plate body and slidably cooperates with the adjusting hole; and An elastic member is disposed between the inner wall of the regulating cavity and the top wall of the lower plate body, and is used to apply a pre-tightening force to the lower plate body to move downward.

[0012] In a possible implementation, the first inlet, the first outlet, the second inlet, and the second outlet are respectively provided with mesh plates, and the mesh plates have ventilation holes penetrating in the thickness direction thereof.

[0013] In a possible implementation, the peak-shaving system of a thermal power unit based on hydrogen energy coupling further includes a combustion-supporting module, and the combustion-supporting module includes: A burner, wherein the burner is arranged in the coal-fired boiler, the output end of the first hydrogen storage tank and the output end of the oxygen storage tank are respectively connected to the inlet end of the burner, the flame spraying end of the burner is connected to the furnace of the coal-fired boiler, and the output end of the oxygen storage tank is also connected to a pulverized coal conveying device; a flame detection sensor, provided in the coal-fired boiler, for detecting the flame in the coal-fired boiler; and The counter is connected to the fire detection sensor for recording the number of signals from the fire detection sensor within a unit time.

[0014] Compared with the prior art, the beneficial effects of the peak load regulation system of thermal power units based on hydrogen energy coupling provided by the present invention are: The present invention provides a thermal power unit peak-shaving system based on hydrogen energy coupling, which includes a thermal power module, an electrolytic hydrogen production module, an oxygen storage module, a hydrogen storage module and a hydrogen-electric module. During operation, the excess electric energy of the thermal power module can be transported to the electrolytic hydrogen production module to prepare hydrogen and oxygen. The oxygen enters the oxygen storage tank for storage after dehydration. After dehydration, the hydrogen is first stored at low pressure through the first hydrogen storage tank, and then enters the second hydrogen storage tank for high-pressure storage through the compressor. The oxygen in the oxygen storage tank and the low-pressure hydrogen in the first hydrogen storage tank can be used for combustion-supporting coal-fired boilers, and hydrogen energy can be mixed and burned for power generation to achieve carbon emission reduction. The high-pressure hydrogen in the second hydrogen storage tank can be transported to a hydrogen filling station or to hydrogen fuel cell power generation. The electric energy generated by hydrogen fuel cell power generation is transported to the power grid, thereby realizing the coupling peak-shaving of thermal power and hydrogen energy. Such a setting not only realizes low-carbon power generation, but also improves the economic benefits of thermal power plants and maximizes the benefits of the electricity market. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of a peak-shaving system for a thermal power unit based on hydrogen energy coupling provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of a hydrogen dehydration device in an embodiment of the present invention; Figure 3 It is a structural schematic diagram of the hydrogen dehydration device in the embodiment of the present invention when it is in a dehydration state; Figure 4 is an internal cross-sectional view of the hydrogen dehydration device in the embodiment of the present invention when it is in a dehydration state; Figure 5 This is a schematic diagram of the structure of two molecular sieve dehydration units connected end to end in an embodiment of the present invention; Figure 6 It is an internal cross-sectional view of two molecular sieve dehydration units connected end to end in an embodiment of the present invention; Figure 7 It is a structural schematic diagram of the hydrogen dehydration device in the embodiment of the present invention when it is in a regeneration state; Figure 8 The internal cross-sectional view of the hydrogen dehydration device in the regeneration state in the embodiment of the present invention Figure 1 ; Fig. 9 The internal cross-sectional view of the hydrogen dehydration device in the regeneration state in the embodiment of the present invention Figure 2 ; Fig.10 It is a schematic diagram of the installation of the scissor mechanism and multiple frames in an embodiment of the present invention.

[0016] Description of reference numerals: 10. Thermal power module; 11. Coal-fired boiler; 12. Thermal power unit; 121. First power generation output terminal; 122. Second power generation output terminal; 13. Coal powder conveying device; 20. Electrolytic hydrogen production module; 30. Oxygen storage module; 31. Oxygen dehydration device; 32. Oxygen storage tank; 40. Hydrogen dehydration device; 41. Casing; 411. Hydrogen inlet; 412. Hydrogen outlet; 413. Regeneration gas inlet; 414. Regeneration gas outlet ; 415, slide; 42, molecular sieve dehydration unit; 421, frame; 4211, heat exchange hole; 422, molecular sieve filler; 423, cover mechanism; 4231, upper cover; 4232, pressure plate; 4233, elastic member; 424, mesh plate; 43, scissor mechanism; 44, heating plate; 45, lifting mechanism; 50, first hydrogen storage tank; 60, second hydrogen storage tank; 70, hydrogen fuel cell; 71, third power generation output terminal. DETAILED DESCRIPTION

[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] It should be noted that when an element is referred to as being "fixed to", "fixed" or "fixedly disposed" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" or "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. When an element is referred to as being "set to" or "disposed on" another element, it may be directly on the other element or there may be a central element. "Multiple" refers to two or more quantities. "At least one" refers to one or more quantities. "Several" refers to one or more quantities.

[0019] Unless defined otherwise, 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 invention belongs.

[0020] Please also read Figures 1 to 10 , a peak-shaving system of a thermal power unit 12 based on hydrogen energy coupling provided in an embodiment of the present invention is described below.

[0021] See also Figure 1 and Figure 2 The embodiment of the present invention provides a peak-shaving system of a thermal power unit 12 based on hydrogen energy coupling, comprising a thermal power module 10, an electrolytic hydrogen production module 20, an oxygen storage module 30, a hydrogen storage module and a hydrogen power module. The thermal power module 10 comprises a coal-fired boiler 11 and a thermal power unit 12, the thermal power unit 12 is connected to the coal-fired boiler 11, the thermal power unit 12 has a first power generation output terminal 121 and a second power generation output terminal 122, the first power generation output terminal 121 is connected to the power grid; the electrolytic hydrogen production module 20 is connected to the second power generation output terminal 122, and is used to electrolyze water to produce oxygen and hydrogen; the oxygen storage module 30 comprises an oxygen dehydration device 31 and an oxygen storage tank 32, the input end of the oxygen dehydration device 31 is connected to the oxygen output end of the electrolytic hydrogen production module 20, and the output end of the oxygen dehydration device 31 is connected to the oxygen storage tank 32; the hydrogen storage module comprises a hydrogen dehydration device 31; The device comprises a first hydrogen storage tank 40, a first hydrogen storage tank 50 and a second hydrogen storage tank 60, the input end of the hydrogen dehydration device 40 is connected to the hydrogen output end of the electrolytic hydrogen production module 20, the output end of the hydrogen dehydration device 40 is connected to the input end of the first hydrogen storage tank 50, the output end of the first hydrogen storage tank 50 is connected to the input end of the second hydrogen storage tank 60, and a compressor is also provided between the output end of the first hydrogen storage tank 50 and the input end of the second hydrogen storage tank 60; the hydrogen-electric module comprises a hydrogen fuel cell 70 connected to the output end of the hydrogen storage device, the hydrogen fuel cell 70 has a third power generation output end 71, and the third power generation output end 71 is connected to the power grid.

[0022] Compared with the prior art, the beneficial effects of a peak-shaving system of a thermal power unit 12 based on hydrogen energy coupling provided by an embodiment of the present invention are: A peak-shaving system of a thermal power unit 12 based on hydrogen energy coupling provided in an embodiment of the present invention includes a thermal power module 10, an electrolytic hydrogen production module 20, an oxygen storage module 30, a hydrogen storage module and a hydrogen-electric module. During operation, the excess electric energy of the thermal power module 10 can be delivered to the electrolytic hydrogen production module 20 to prepare hydrogen and oxygen. The oxygen enters the oxygen storage tank 32 for storage after dehydration. After dehydration, the hydrogen is first stored at low pressure through the first hydrogen storage tank 50, and then enters the second hydrogen storage tank 60 for high-pressure storage through the compressor. The oxygen in the oxygen storage tank 32 and the low-pressure hydrogen in the first hydrogen storage tank 50 can be used for combustion-supporting coal-fired boilers 11, and the hydrogen energy is mixed and burned to generate electricity to achieve carbon emission reduction. The high-pressure hydrogen in the second hydrogen storage tank 60 can be delivered to a hydrogen refueling station or a hydrogen fuel cell 70 for power generation. The electric energy generated by the hydrogen fuel cell 70 is delivered to the power grid, thereby realizing the coupled peak-shaving of thermal power and hydrogen energy. Such a setting not only realizes low-carbon power generation, but also improves the economic benefits of thermal power plants and maximizes the benefits of the electricity market.

[0023] In the embodiment of the present invention, the thermal power module 10 includes a coal-fired boiler 11 and a thermal power unit 12. The high-temperature and high-pressure steam is generated by burning coal, which drives the steam turbine to generate electricity, and the generated electricity is transmitted to the power grid for power supply. During the low electricity consumption period, the excess electricity is transmitted to the electrolytic hydrogen production module 20 through the second power generation output terminal 122. The electrolytic hydrogen production module 20 electrolyzes water to prepare hydrogen and oxygen. The hydrogen and oxygen can be used for the coal-fired boiler 11 to generate electricity. The hydrogen can also be used for hydrogenation stations and hydrogen fuel cells 70 to generate electricity. While achieving low-carbon production, it can also improve economic benefits.

[0024] See also Figure 2 In some possible embodiments, the hydrogen dehydration device 40 includes a shell 41, and a molecular sieve dehydration unit 42 arranged in the shell 41, the shell 41 is provided with a hydrogen inlet 411, a hydrogen outlet 412, a regeneration gas inlet 413 and a regeneration gas outlet 414, the hydrogen inlet 411 is connected to the hydrogen output end of the electrolytic hydrogen production module 20, and the hydrogen outlet 412 is connected to the input end of the first hydrogen storage tank 50; the hydrogen dehydration device 40 has a dehydration state and a regeneration state, when in the dehydration state, the hydrogen inlet 411 is connected to the hydrogen outlet 412, when in the regeneration state, the regeneration gas inlet 413 is connected to the regeneration gas outlet 414, and two hydrogen dehydration devices 40 are provided, and the two hydrogen dehydration devices 40 switch alternately between the dehydration state and the regeneration state.

[0025] In this embodiment, the shell 41 can be made of metal or other materials. The shell 41 is a rectangular parallelepiped as shown in the figure. The long axis direction of the shell 41 is the direction of the line connecting the hydrogen inlet 411 and the hydrogen outlet 412 as shown in the figure, and the short axis direction of the shell 41 is the direction of the line connecting the regeneration gas inlet 413 and the regeneration gas outlet 414 as shown in the figure.

[0026] The hydrogen dehydration device 40 uses a molecular sieve filler 422 to absorb impurities in hydrogen. When the molecular sieve filler 422 is saturated with water, the water absorption capacity is reduced and regeneration treatment is required, that is, heating (200-300°C) to evaporate the water adsorbed by the molecular sieve filler 422. When one hydrogen dehydration device 40 is in a dehydration state, the other hydrogen dehydration device 40 is in a regeneration state. As for the switching of the gas path, it can be achieved through an electric control valve and an automatic controller. Of course, the structure of the above-mentioned hydrogen dehydration device 40 can also be applied to oxygen dehydration, and the user can set it according to needs.

[0027] See also Figures 3 to 10 In some possible embodiments, the shell 41 is a rectangular shell component, the hydrogen inlet 411 and the hydrogen outlet 412 are respectively opened on the two side walls of the shell 41 in the long axis direction, and the regeneration gas inlet 413 and the regeneration gas outlet 414 are respectively opened on the two side walls of the shell 41 in the short axis direction; the regeneration gas outlet 414 and the regeneration gas inlet 413 are respectively arranged in plurality along the long axis direction of the shell 41, and the regeneration gas outlet 414 and the regeneration gas inlet 413 correspond one to one in the short axis direction of the shell 41; a plurality of molecular sieve dehydration units 42 are provided, and the plurality of molecular sieve dehydration units 42 are arranged in plurality along the long axis direction of the shell 41 and can slide along the long axis direction of the shell 41.

[0028] The molecular sieve dehydration unit 42 includes a frame 421 and a molecular sieve filler 422 arranged in the frame 421. The frame 421 has a first inlet and a first outlet on both side walls along the long axis direction of the shell 41, and a second inlet and a second outlet on both side walls along the short axis direction of the shell 41.

[0029] When the hydrogen dehydration device 40 is in a dehydration state, the multiple molecular sieve dehydration units 42 in the outer shell 41 are connected end to end, and the first outlet of the previous molecular sieve dehydration unit 42 is connected to the first inlet of the next molecular sieve dehydration unit 42; when the hydrogen dehydration device 40 is in a regeneration state, the molecular sieve dehydration units 42 in the outer shell 41 are spaced a preset distance from front to back, the second inlet of the molecular sieve dehydration unit 42 is connected to the corresponding regeneration gas inlet 413, the second outlet of the molecular sieve dehydration unit 42 is connected to the corresponding regeneration gas outlet 414, and the hydrogen inlet 411 and the hydrogen outlet 412 are closed.

[0030] In the present embodiment, a plurality of molecular sieve dehydration units 42 are provided, and the plurality of molecular sieve dehydration units 42 are arranged along the long axis direction of the outer shell 41. When dehydration adsorption is required, the plurality of molecular sieve dehydration units 42 are arranged in sequence and abut against each other. The first inlet of the molecular sieve dehydration unit 42 at the front end is connected to the hydrogen inlet 411 of the outer shell 41. After the hydrogen enters the outer shell 41, it can pass through the plurality of molecular sieve dehydration units 42 in sequence, and then be discharged from the hydrogen outlet 412, so as to obtain dry hydrogen.

[0031] When the hydrogen dehydration device 40 is in the regeneration state, the multiple molecular sieve dehydration units 42 are driven to separate from each other by driving mechanisms such as telescopic rods and telescopic cylinders, so that the second inlet of each molecular sieve dehydration unit 42 is connected to the corresponding regeneration gas inlet 413, and the second outlet is connected to the corresponding regeneration gas outlet 414, and the moisture of the molecular sieve filler 422 is taken away by the flowing regeneration gas to complete the regeneration.

[0032] The regeneration gas may be dry gas with a certain temperature, and a fan etc. may be used to realize the flow of the regeneration gas. In order to collect the moisture absorbed by the regeneration gas, a condenser may be connected to the regeneration gas outlet 414 to collect the moisture.

[0033] When regenerating the molecular sieve filler 422, it is necessary to make the high-temperature regeneration gas flow through the molecular sieve filler 422. Since the molecular sieve will be pulverized after a certain period of use, too large a regeneration gas flow rate will accelerate the pulverization, thereby reducing the service life of the molecular sieve. Therefore, the gas flow rate flowing through the molecular sieve filler 422 should not be too large. However, if the path of the regeneration gas is set along the long axis direction of the shell 41, the length of the molecular sieve that the shell 41 needs to flow through is long. In order to overcome the flow resistance, the flow rate of the regeneration gas flow will inevitably be set to be larger, and excessive gas flow will accelerate the pulverization of the molecular sieve.

[0034] In order to reduce the air flow velocity flowing through the molecular sieve filler 422 and ensure that the regenerated air flow can smoothly carry away the moisture in the molecular sieve filler 422, in this embodiment, a plurality of regeneration gas outlets 414 and regeneration gas inlets 413 are respectively arranged at intervals along the long axis direction of the outer shell 41, and the regeneration gas flows along the short axis direction of the outer shell 41. In this way, the flow resistance of the regeneration air flow can be reduced, the air flow velocity can be set to a smaller value, and the life of the molecular sieve filler 422 can be appropriately extended.

[0035] In order to clearly understand the water absorption / drying state of the molecular sieve dehydration unit 42 , a plurality of humidity sensors may be arranged at different positions in the housing 41 to detect the humidity inside the housing 41 and indirectly determine the state of the molecular sieve filler 422 .

[0036] See also Figure 5 and Figure 6In some possible embodiments, the first inlet and the first outlet are arranged in an up-and-down staggered manner, the first outlet of the preceding molecular sieve dehydration unit 42 and the first inlet of the succeeding molecular sieve dehydration unit 42 are aligned in height, and the first inlet of the molecular sieve dehydration unit 42 at the front end is connected to the hydrogen inlet 411. In this way, when the hydrogen dehydration device 40 is in a dehydration state, the plurality of molecular sieve dehydration units 42 can form a tortuous dehydration channel, forcing the hydrogen to flow along the tortuous dehydration channel, thereby improving the dehydration and drying effect of the hydrogen.

[0037] See also Figure 4 , Figure 8 and Fig.10 In some possible embodiments, the bottom wall of the shell 41 is provided with a slide groove 415 along its long axis direction, and the frame 421 is slidably matched with the slide groove 415. The hydrogen dehydration device 40 also includes a scissor mechanism 43, which is telescopically arranged inside the shell 41 along the long axis direction of the shell 41, and multiple frames 421 are arranged one by one on multiple hinge shafts of the scissor mechanism 43.

[0038] This embodiment uses a scissor mechanism 43 to drive multiple frames 421 to move synchronously, with a simple structure, and each frame 421 is arranged on a hinge shaft corresponding to the scissor mechanism 43, which can control the intervals between the multiple frames 421 to remain consistent, making it convenient to switch between the dehydration state and the regeneration state of the multiple molecular sieve dehydration units 42. The movement of the scissor mechanism 43 can be driven by a hydraulic telescopic rod, and the movement position of the scissor mechanism 43 can also be detected by a position sensor or an angle sensor.

[0039] See also Figure 3 , Figure 4 and Figure 7 In some possible embodiments, a plurality of avoidance holes are provided at intervals on the top of the shell 41 along the long axis direction of the shell 41. The hydrogen dehydration device 40 further comprises a heating plate 44 and a lifting mechanism 45. A plurality of heating plates 44 and a lifting mechanism 45 are provided respectively. The plurality of heating plates 44 are arranged at intervals along the long axis direction of the shell 41. At least one heating plate 44 is provided on both sides of each molecular sieve dehydration unit 42. The heating plates 44 are arranged in the avoidance holes one by one. The lifting mechanism 45 is used to drive the corresponding heating plates 44 to rise and fall vertically. A heat exchange hole 4211 is provided on the side wall of the frame 421 adjacent to the heating plate 44. The heat exchange hole 4211 penetrates the wall thickness of the frame 421. The heat exchange holes 4211 of the front and rear frames 421 are staggered so that when the two frames 421 are butted end to end, the heat exchange holes 4211 on the fitting surfaces of the two frames 421 are both closed.

[0040] In this embodiment, a liftable heating plate 44 is provided, and the heating surface of the heating plate 44 faces the molecular sieve dehydration unit 42, so that the molecular sieve dehydration unit 42 can be baked and heated during regeneration, thereby improving the efficiency of regeneration of the molecular sieve filler 422. The heating plate 44 can adopt an electric heating element in the prior art. In order to improve the heating efficiency of the heating plate 44 to the molecular sieve filler 422, a heat exchange hole 4211 is provided on the side wall of the frame 421. At the same time, in order to avoid hydrogen from flowing out of the heat exchange hole 4211 during hydrogen dehydration, the heat exchange holes 4211 of the front and rear frames 421 are staggered, so that when the two frames 421 are butted head to tail, the side wall of the front frame 421 fits with the heat exchange hole 4211 of the rear frame 421, and the heat exchange holes 4211 of the fitting surfaces of the two frames 421 are all closed.

[0041] See also Figure 3 and Figure 4 In some possible embodiments, a first sealing plate is provided on the top of the heating plate 44, and a second sealing plate is provided on the bottom of the heating plate 44. When the heating plate 44 is at the top dead point, the first sealing plate abuts against the top wall of the inner cavity of the shell 41 to seal the avoidance hole. When the heating plate 44 is at the bottom dead point, the second sealing plate abuts against the top wall outside the shell 41 to seal the avoidance hole, which can prevent gas from escaping from the avoidance hole. The lifting and lowering of the heating plate 44 can be achieved by a vertically arranged electric lift, a telescopic cylinder, etc.

[0042] See also Figure 5 , Figure 6 and Fig. 9 In some possible embodiments, the top of the frame 421 is open, and the molecular sieve dehydration unit 42 further includes a cover mechanism 423, which includes an upper cover 4231, a pressing plate 4232, and an elastic member 4233. The upper cover 4231 is provided at the top opening of the frame 421, and an adjustment cavity is formed in the hollow interior of the upper cover 4231, and an adjustment hole connected to the adjustment cavity is provided at the bottom of the upper cover 4231; the pressing plate 4232 includes an upper plate body, a lower plate body, and a connecting rod, the upper plate body is accommodated in the adjustment cavity, the lower plate body is located below the upper cover 4231, the connecting rod is connected to the upper plate body and the lower plate body, and slides with the adjustment hole; the elastic member 4233 is provided between the inner wall of the adjustment cavity and the top wall of the lower plate body, and the elastic member 4233 is used to apply a pre-tightening force to the lower plate body to move downward.

[0043] In this embodiment, the cover mechanism 423 includes an upper cover 4231, a pressing plate 4232 and an elastic member 4233. The upper cover 4231 is detachably arranged on the top of the frame 421 to seal the top of the frame 421. The pressing plate 4232 is slidable up and down and arranged on the upper cover 4231. The elastic member 4233 is arranged on the upper cover 4231. A downward pre-tightening force is applied to the pressing plate 4232 so that the pressing plate 4232 can press the molecular sieve filler 422 downward. In this way, when the molecular sieve filler 422 is pulverized, the pressing plate 4232 can continue to press the molecular sieve filler 422 downward under the action of the elastic member 4233, so that the remaining molecular sieve filler 422 is kept tightly filled, so as to prevent the gap between the molecular sieve fillers 422 from increasing due to the pulverization of part of the molecular sieve, and the vibration increases under the action of the airflow, which aggravates the problem of pulverization.

[0044] See also Figure 5 , Fig. 9 and Fig.10 In some possible embodiments, the first inlet, the first outlet, the second inlet, and the second outlet are respectively provided with mesh plates 424, and the mesh plates 424 have vent holes running through the thickness direction thereof. The mesh plates 424 may be metal meshes to prevent the molecular sieve filler 422 from falling out.

[0045] In some possible embodiments, a peak-shaving system of a thermal power unit 12 based on hydrogen energy coupling further includes a combustion-supporting module, which includes a burner, a fire detection sensor and a counter. The burner is provided in the coal-fired boiler 11, the output end of the first hydrogen storage tank 50 and the output end of the oxygen storage tank 32 are respectively connected to the inlet end of the burner, the flame-spraying end of the burner is connected to the furnace of the coal-fired boiler 11, and the output end of the oxygen storage tank 32 is also connected to the coal powder conveying device 13; the fire detection sensor is provided in the coal-fired boiler 11, and is used to detect the flame in the coal-fired boiler 11; the counter is connected to the fire detection sensor in communication, and is used to record the number of signals of the fire detection sensor per unit time.

[0046] In this embodiment, the combustion-supporting module includes a burner, a fire detection sensor and a counter. The fire detection sensor is arranged on the coal-fired boiler 11 and can detect the combustion condition of the flame in the coal-fired boiler 11. When the flame combustion condition is poor, the fire detection sensor generates a signal and transmits the signal to the counter. When the counter counts a preset number of times, the burner uses hydrogen and oxygen to support combustion, ensuring that the coal-fired boiler 11 operates in a stable condition. Among them, one or more burners and fire detection sensors can be set as needed.

[0047] It can be understood that the various parts in the above-mentioned embodiments can be freely combined or deleted to form different combination embodiments. The specific contents of each combination embodiment will not be repeated here. After this description, it can be considered that the specification of the present invention has recorded various combination embodiments and can support different combination embodiments.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A peak-shaving system for thermal power units based on hydrogen energy coupling, characterized in that: include: A thermal power module, comprising a coal-fired boiler and a thermal power unit, wherein the thermal power unit is connected to the coal-fired boiler, and the thermal power unit has a first power generation output end and a second power generation output end, wherein the first power generation output end is connected to a power grid; An electrolysis hydrogen production module, connected to the second power generation output end, for electrolyzing water to produce oxygen and hydrogen; An oxygen storage module, comprising an oxygen dehydration device and an oxygen storage tank, wherein the input end of the oxygen dehydration device is connected to the oxygen output end of the electrolytic hydrogen production module, and the output end of the oxygen dehydration device is connected to the oxygen storage tank; A hydrogen storage module, comprising a hydrogen dehydration device, a first hydrogen storage tank and a second hydrogen storage tank, wherein the input end of the hydrogen dehydration device is connected to the hydrogen output end of the electrolytic hydrogen production module, the output end of the hydrogen dehydration device is connected to the input end of the first hydrogen storage tank, the output end of the first hydrogen storage tank is connected to the input end of the second hydrogen storage tank, and a compressor is further provided between the output end of the first hydrogen storage tank and the input end of the second hydrogen storage tank; as well as The hydrogen power module comprises a hydrogen fuel cell connected to the output end of the second hydrogen storage tank, wherein the hydrogen fuel cell has a third power generation output end connected to the power grid.

2. A peak-shaving system for thermal power units based on hydrogen energy coupling according to claim 1, characterized in that: The hydrogen dehydration device comprises a shell, and a molecular sieve dehydration unit arranged in the shell, the shell is provided with a hydrogen inlet, a hydrogen outlet, a regeneration gas inlet and a regeneration gas outlet, the hydrogen inlet is connected to the hydrogen output end of the electrolysis hydrogen production module, and the hydrogen outlet is connected to the input end of the first hydrogen storage tank; The hydrogen dehydration device has a dehydration state and a regeneration state. When in the dehydration state, the hydrogen inlet and the hydrogen outlet are connected. When in the regeneration state, the regeneration gas inlet and the regeneration gas outlet are connected. Two hydrogen dehydration devices are provided, and the two hydrogen dehydration devices alternately switch between the dehydration state and the regeneration state.

3. A peak-shaving system for thermal power units based on hydrogen energy coupling according to claim 2, characterized in that: The shell is a rectangular shell member, the hydrogen inlet and the hydrogen outlet are respectively provided on the two side walls of the shell in the long axis direction, and the regeneration gas inlet and the regeneration gas outlet are respectively provided on the two side walls of the shell in the short axis direction; the regeneration gas outlet and the regeneration gas inlet are respectively provided with a plurality of regeneration gas outlets and regeneration gas inlets at intervals along the long axis direction of the shell, and the regeneration gas outlets and the regeneration gas inlets correspond to each other one by one in the short axis direction of the shell; The molecular sieve dehydration unit is provided with a plurality of molecular sieve dehydration units, and the plurality of molecular sieve dehydration units are arranged at intervals along the long axis direction of the shell and can slide along the long axis direction of the shell; the molecular sieve dehydration unit comprises a frame body and a molecular sieve filler arranged in the frame body, and the frame body is provided with a first inlet and a first outlet on both side walls along the long axis direction of the shell, and the frame body is provided with a second inlet and a second outlet on both side walls along the short axis direction of the shell; When the hydrogen dehydration device is in the dehydration state, the multiple molecular sieve dehydration units in the housing are butted end to end, and the first outlet of the previous molecular sieve dehydration unit is connected to the first inlet of the next molecular sieve dehydration unit; When the hydrogen dehydration device is in the regeneration state, the molecular sieve dehydration units in the housing are spaced apart by a preset distance, the second inlet of the molecular sieve dehydration unit is connected to the corresponding regeneration gas inlet, and the second outlet of the molecular sieve dehydration unit is connected to the corresponding regeneration gas outlet.

4. A peak-shaving system for thermal power units based on hydrogen energy coupling according to claim 3, characterized in that: The first inlet and the first outlet are arranged alternately up and down, and when the hydrogen dehydration device is in the dehydration state, the plurality of molecular sieve dehydration units can form a tortuous dehydration channel.

5. A peak-shaving system for thermal power units based on hydrogen energy coupling according to claim 3, characterized in that: The bottom wall of the shell is provided with a slide groove along its long axis direction, and the frame body is slidably matched with the slide groove. The hydrogen dehydration device also includes a scissor-fork mechanism, which is telescopically arranged inside the shell along the long axis direction of the shell, and the multiple frames are arranged one-to-one correspondingly on the multiple hinge shafts of the scissor-fork mechanism.

6. A peak load regulation system for thermal power units based on hydrogen energy coupling according to claim 3, characterized in that: The top of the shell is provided with a plurality of avoidance holes at intervals along the long axis direction of the shell. The hydrogen dehydration device further comprises a heating plate and a lifting mechanism. The heating plate and the lifting mechanism are provided with a plurality of heating plates respectively. The plurality of heating plates are arranged at intervals along the long axis direction of the shell. At least one heating plate is provided on both sides of each molecular sieve dehydration unit. The heating plates are arranged in a one-to-one correspondence at the avoidance holes. The lifting mechanism is used to drive the corresponding heating plates to rise and fall vertically. The side wall of the frame adjacent to the heating plate is provided with a heat exchange hole, and the heat exchange hole penetrates the wall thickness of the frame; The heat exchange holes of the front and rear frames are staggered so that when the two frames are butted end to end, the heat exchange holes on the mating surfaces of the two frames are both closed.

7. A peak-shaving system for thermal power units based on hydrogen energy coupling according to claim 6, characterized in that: A first sealing plate is provided on the top of the heating plate, and a second sealing plate is provided on the bottom of the heating plate. When the heating plate is at the upper dead point, the first sealing plate abuts against the top wall of the inner cavity of the shell to seal the avoidance hole. When the heating plate is at the lower dead point, the second sealing plate abuts against the top wall of the outer side of the shell to seal the avoidance hole.

8. The peak load regulation system of thermal power units based on hydrogen energy coupling according to claim 3 is characterized in that: The top of the frame is open, and the molecular sieve dehydration unit further includes a cover mechanism, which includes: An upper cover is arranged at the top opening of the frame body, the interior of the upper cover is hollow to form an adjustment cavity, and the bottom of the upper cover is provided with an adjustment hole connected with the adjustment cavity; A pressing plate, comprising an upper plate body, a lower plate body and a connecting rod, wherein the upper plate body is accommodated in the adjusting cavity, the lower plate body is located below the upper cover, and the connecting rod is connected to the upper plate body and the lower plate body and slidably cooperates with the adjusting hole; and An elastic member is disposed between the inner wall of the regulating cavity and the top wall of the lower plate body, and is used to apply a pre-tightening force to the lower plate body to move downward.

9. The peak load regulation system of thermal power units based on hydrogen energy coupling according to claim 3 is characterized in that: The first inlet, the first outlet, the second inlet and the second outlet are respectively provided with mesh plates, and the mesh plates have ventilation holes penetrating in the thickness direction thereof.

10. The peak load regulation system of thermal power units based on hydrogen energy coupling according to claim 1, characterized in that: The peak-shaving system of a thermal power unit based on hydrogen energy coupling further includes a combustion-supporting module, and the combustion-supporting module includes: A burner, wherein the burner is arranged in the coal-fired boiler, the output end of the first hydrogen storage tank and the output end of the oxygen storage tank are respectively connected to the inlet end of the burner, the flame spraying end of the burner is connected to the furnace of the coal-fired boiler, and the output end of the oxygen storage tank is also connected to a pulverized coal conveying device; a flame detection sensor, provided in the coal-fired boiler, for detecting the flame in the coal-fired boiler; and The counter is connected to the fire detection sensor for recording the number of signals from the fire detection sensor within a unit time.

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