CN213360085U - Coal bed gas circulation power generation system - Google Patents
Coal bed gas circulation power generation system Download PDFInfo
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- CN213360085U CN213360085U CN202022166930.8U CN202022166930U CN213360085U CN 213360085 U CN213360085 U CN 213360085U CN 202022166930 U CN202022166930 U CN 202022166930U CN 213360085 U CN213360085 U CN 213360085U
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Abstract
The utility model discloses a coal bed gas circulation power generation system, which comprises a coal bed gas fracturing pumping-promoting structure, a gas power generation mechanism and a Brayton power circulation power generation structure; the coal bed gas fracturing pumping-promoting structure is communicated with the gas power generation mechanism through a pumping pipe; the gas power generation mechanism is communicated with the Brayton power cycle power generation structure through a heat exchanger; the Brayton power cycle power generation structure is communicated with the coal bed gas fracturing pumping promoting structure through the connecting component. The utility model discloses a set up the short structure of taking out of coal seam gas fracturing, gas power generation mechanism and brayton power cycle power generation structure, the three combines together and can provide stable power, has improved the whole efficiency of system, and the rational use brayton power cycle power generation structure simultaneously makes the existing higher generating efficiency of whole power generation system, has fabulous environmental protection performance again, has great meaning to environmental protection.
Description
Technical Field
The utility model belongs to the technical field of coal seam gas electricity generation, especially, relate to a coal seam gas circulation power generation system.
Background
The coal bed gas reserves in China are quite rich, but compared with the reserves with huge resources, the coal bed in China generally belongs to a low-permeability coal bed, and the coal bed gas recovery and utilization rate is not high, so that the resource waste is caused; at present, the coal bed gas yield is improved by adopting hydraulic fracturing, slotting for improving permeability and water injection for gas displacement, and as a result, the gas yield is increased in the initial stage after fracturing, but the gas yield is reduced quickly because continuous and stable gas flow cannot be formed. In addition, the carbon dioxide has relatively moderate critical pressure, good stability and nuclear physical property, shows the property of inert gas in a certain temperature range, and can be used as supercritical carbon dioxide (s-C0)2) The carbon dioxide supercritical fluid has high density and no phase change within a certain operating parameter range, is applied as a power source, provides power for Brayton cycle, can improve the yield of coal bed gas, and can realize the maximization of resource utilization through the cycle of working medium supercritical carbon dioxide.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that not enough among the above-mentioned prior art is directed at, provide a coal seam gas circulation power generation system, through setting up coal seam gas fracturing promotes take out the structure gas power generation mechanism with brayton power cycle power generation structure, the three combines together and can provide stable power, has improved the whole efficiency of system, and rational use brayton power cycle power generation structure makes the existing higher generating efficiency of whole power generation system simultaneously, has fabulous environmental protection performance again, has great meaning to environmental protection.
In order to solve the technical problem, the utility model discloses a technical scheme is: the utility model provides a coal seam gas circulation power generation system which characterized in that: the coal bed gas fracturing drainage-promoting device comprises a coal bed gas fracturing drainage-promoting structure extending into a coal bed, a gas power generation mechanism connected with the coal bed gas fracturing drainage-promoting structure and used for consuming gas in the coal bed, and a Brayton power cycle power generation structure connected between the coal bed gas fracturing drainage-promoting structure and the gas power generation mechanism and used for promoting gas in the coal bed to be discharged;
the coal bed gas fracturing pumping-promoting structure is communicated with the gas power generation mechanism through a pumping pipe; the gas power generation mechanism is communicated with the Brayton power cycle power generation structure through a heat exchanger; the Brayton power cycle power generation structure is communicated with the coal bed gas fracturing pumping promotion structure through a connecting assembly; the coupling assembling includes the connecting pipe and sets up and be used for controlling on the connecting pipe gas flow's in the connecting pipe control valve.
Foretell coal seam gas circulation power generation system, its characterized in that: the coal bed gas fracturing pumping-promoting structure comprises a fracturing pipe extending into the coal bed, a valve mechanism arranged on the fracturing pipe, and a pressure detection mechanism arranged on the fracturing pipe and used for detecting pressure change on the fracturing pipe;
the valve mechanism comprises a first valve component and a second valve component which are sequentially arranged along the length direction of the fracturing pipe, the first valve component and the second valve component are the same in structural size, and the first valve component is arranged at the position, close to the connecting pipe, of the fracturing pipe; the first valve assembly and the second valve assembly respectively comprise a stop valve and a pressure release valve which are installed on the fracturing pipe, and the stop valves are arranged on one side close to the connecting pipe.
Foretell coal seam gas circulation power generation system, its characterized in that: the pressure detection mechanism comprises a controller and a pressure sensor which is arranged on the fracturing pipe and connected with the controller, and the output end of the pressure sensor is connected with the input end of the controller.
Foretell coal seam gas circulation power generation system, its characterized in that: the fracturing pipe is also provided with a flowmeter and a pressure pump, and the output end of the flowmeter is connected with the input end of the controller.
Foretell coal seam gas circulation power generation system, its characterized in that: the gas power generation mechanism comprises an air separation device, a combustor connected with the air separation device and used for fully combusting gas, and a gas turbine communicated with the combustor; and an inlet of the air separation device is connected with an air compressor unit, and an exhaust port of the gas turbine is connected with a gas turbine generator set.
Foretell coal seam gas circulation power generation system, its characterized in that: the Brayton power cycle power generation structure comprises a supercritical carbon dioxide turbine which is communicated with a connecting pipe and is used for transmitting supercritical carbon dioxide into a coal bed and a conversion mechanism which is connected with the supercritical carbon dioxide turbine and is used for converting gas in the supercritical carbon dioxide turbine; the conversion mechanism comprises a regenerator assembly communicated with an outlet of the supercritical carbon dioxide turbine for conveying converted gas into the heat exchanger and a compressor assembly communicated with the regenerator assembly for compressing the gas entering the regenerator assembly.
Foretell coal seam gas circulation power generation system, its characterized in that: the heat regenerator assembly comprises a high-temperature heat regenerator communicated with an outlet of the supercritical carbon dioxide turbine and a low-temperature heat regenerator connected with the high-temperature heat regenerator; the compressor assembly comprises a main compressor and an auxiliary compressor which are connected with a low-temperature heat regenerator and used for compressing gas, and a precooler is arranged between the main compressor and the low-temperature heat regenerator.
Compared with the prior art, the utility model has the following advantage:
1. the utility model discloses a set up coal seam gas fracturing promotes take out the structure gas power generation mechanism with brayton power cycle power generation structure, the three combines together and can provide stable power, has improved the whole efficiency of system, and rational use brayton power cycle power generation structure simultaneously makes the existing higher generating efficiency of whole power generation system, has fabulous environmental protection performance again, has great meaning to environmental protection.
2. The heat exchanger is arranged in the utility model, so that the heat transfer between the gas power generation mechanism and the Brayton power cycle power generation structure is realized; the gas extracted from the coal seam can be directly used for combustion power generation by using the extraction pipe, and meanwhile, the Brayton power cycle power generation structure and the coal seam gas fracturing drainage promoting structure are communicated by combining the connecting assembly, so that the extraction of the gas in the coal seam is promoted on one hand, and the use of the Brayton power cycle power generation structure is not influenced on the other hand.
To sum up, the utility model discloses a set up the coal seam gas fracturing promotes take out the structure gas electricity generation mechanism with brayton power cycle power generation structure, the three combines together and can provide stable power, has improved the whole efficiency of system, and rational use brayton power cycle power generation structure simultaneously makes the existing higher generating efficiency of whole power generation system, has fabulous environmental protection performance again, has great meaning to environmental protection.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic circuit block diagram of the pressure detecting mechanism of the present invention.
Description of reference numerals:
1-an air compressor unit; 2-air separation plant; 3-a burner;
4-gas turbine; 5-gas turbine generator set; 6, a heat exchanger;
7-high temperature regenerator; 8-low temperature regenerator; 9-a precooler;
10-a main compressor; 11-auxiliary compressor;
12-a supercritical carbon dioxide turbine; 13-supercritical carbon dioxide turbogenerator;
15-a flow meter; 16-a pressure pump; 17-a stop valve;
18-a pressure relief valve; 21-a pressure sensor; 22-a controller;
23-pumping out the pipe; 24-fracturing the tube; 25-gas purification device;
26-coal seam; 27-connecting pipe; 28-control valve.
Detailed Description
As shown in fig. 1, the utility model comprises a coal seam gas fracturing pumping-promoting structure extending into a coal seam 26, a gas power generation mechanism connected with the coal seam gas fracturing pumping-promoting structure and used for consuming gas in the coal seam 26, and a brayton power cycle power generation structure connected between the coal seam gas fracturing pumping-promoting structure and the gas power generation mechanism and used for promoting gas in the coal seam 26 to be discharged;
the coal bed gas fracturing pumping-promoting structure is communicated with the gas power generation mechanism through a pumping pipe 23; the gas power generation mechanism is communicated with the Brayton power cycle power generation structure through a heat exchanger 6; the Brayton power cycle power generation structure is communicated with the coal bed gas fracturing pumping promotion structure through a connecting assembly; the connection assembly includes a connection pipe 27 and a control valve 28 provided on the connection pipe 27 for controlling the flow of gas in the connection pipe 27.
During the in-service use, through setting up the coal seam gas fracturing promotes take out the structure gas power generation mechanism with brayton power cycle power generation structure, the three combines together and can provides stable power, has improved the overall efficiency of system, and the while rationally uses brayton power cycle power generation structure, makes the existing higher generating efficiency of whole power generation system, has fabulous environmental protection performance again, has great meaning to environmental protection.
The heat exchanger 6 is arranged, so that heat transfer between the gas power generation mechanism and the Brayton power cycle power generation mechanism is realized; the gas extracted from the coal seam 26 can be directly used for combustion power generation by using the extraction pipe 23, and meanwhile, the Brayton power cycle power generation structure and the coal seam gas fracturing pumping promotion structure are communicated by combining the connecting assembly, so that the extraction of the gas in the coal seam 26 is promoted on one hand, and the use of the Brayton power cycle power generation structure is not influenced on the other hand.
A gas purification device 25 is provided between the extraction pipe 23 and the burner 3, and the extracted gas can be purified and then burned. The control valve 28 is selected to be Z61Y-250.
In this embodiment, the coal bed gas fracturing pumping promoting structure includes a fracturing pipe 24 extending into the coal bed 26, a valve mechanism disposed on the fracturing pipe 24, and a pressure detecting mechanism disposed on the fracturing pipe 24 and used for detecting pressure changes on the fracturing pipe 24;
the valve mechanism comprises a first valve component and a second valve component which are sequentially arranged along the length direction of the fracturing pipe 24, the structural sizes of the first valve component and the second valve component are the same, and the first valve component is arranged at the position of the fracturing pipe 24 close to the connecting pipe 27; the first valve component and the second valve component both comprise a stop valve 17 and a pressure relief valve 18 which are both arranged on the fracturing pipe 24, and the stop valve 17 is arranged on one side close to the connecting pipe 27. In actual use, the stop valve 17 is J41H, and the relief valve 18 is A4 BY-100C.
As shown in fig. 2, in the present embodiment, the pressure detection mechanism includes a controller 22 and a pressure sensor 21 disposed on the fracturing pipe 24 and connected to the controller 22, and an output end of the pressure sensor 21 is connected to an input end of the controller 22.
In actual use, the pressure sensor 21 detects pressure parameters in the fracturing pipe 24, so that excessive pressure in the fracturing pipe 24 is prevented, and gas in the coal seam 26 is prevented from being discharged. The controller 22 selects a PLC controller of Mitsubishi FX1N-24MF-001, and the pressure sensor 21 selects a joint measurement intelligent pressure digital display meter with the model of 3151DP 8.
As shown in fig. 2, in this embodiment, the fracturing pipe 24 is further provided with a flow meter 15 and a pressure pump 16, and an output end of the flow meter 15 is connected to an input end of the controller 22.
During actual use, an exhaust port of the Brayton power cycle power generation structure is connected with an air inlet of the pressure pump 16, an air outlet of the pressure pump 16 is connected with an air inlet of the fracturing pipe, so that initial pressure during drilling of the mounting hole of the fracturing pipe 24 is stable, the control valve 28 is opened, pressure injection is performed by means of a pipeline self-pressurization function under the condition that the pressure pump 16 is not opened, when the drilling pressure reaches a certain value, after the pressure injection lasts for a period of time, the pressure pump 16 is opened, supercritical carbon dioxide is injected into the coal seam 26, and the pressure injection is performed according to a set pressure-increasing gradient in the fracturing process. In order to monitor the pressure of the fracturing pipe 24, a pressure pump 16 and a flow meter 15 are arranged on the fracturing pipe 24, and the pressure sensor 21 is combined and connected with a controller 22 to accurately monitor the pressure and working medium flow of the fracturing pipe 24 in the fracturing permeability-increasing process. The flowmeter 15 is a rotor flowmeter with the model of LZD-100; the booster pump 16 was selected to be STD 10.
In the embodiment, the gas power generation mechanism comprises an air separation unit 2, a combustor 3 connected with the air separation unit 2 and used for fully combusting gas, and a gas turbine 4 communicated with the combustor 3; an inlet of the air separation device 2 is connected with an air compressor unit 1, and an exhaust port of the gas turbine 4 is connected with a gas turbine generator set 5.
In practical use, the gas turbine 4 selects MC5200C, and the main function of the air separation plant 2 is to separate the gas compressed by the air compressor set 1 to obtain oxygen, so as to facilitate the gas entering the combustor 3 to be fully combusted. As shown in fig. 1, an outlet of the air compressor unit 1 is communicated with an inlet of the air separation unit 2, an outlet of the air separation unit 2 is communicated with an inlet of the combustor 3, and air compressed by the air compressor unit 1 is mixed and combusted in the combustor 3 to form high-temperature gas, so that the gas turbine 4 works and drives the gas turbine generator set 5 to generate power. The fuel is subjected to oxygen-enriched combustion in the combustor 3 through the air separation device 2, so that the carbon dioxide trapping step is reduced, the gas displaced by the supercritical carbon dioxide is used as the fuel of the gas power generation mechanism, the exhaust of the gas power generation mechanism is used as the heat source of the Brayton power cycle power generation structure, and the gas and Brayton combined power cycle is realized.
In this embodiment, the brayton power cycle power generation structure includes a supercritical carbon dioxide turbine 12 communicated with the connection pipe 27 for transferring supercritical carbon dioxide into the coal seam 26, and a conversion mechanism connected with the supercritical carbon dioxide turbine 12 for converting gas in the supercritical carbon dioxide turbine 12; the conversion mechanism includes a regenerator assembly in communication with the outlet of the supercritical carbon dioxide turbine 12 for delivering the converted gas into the heat exchanger 6 and a compressor assembly in communication with the regenerator assembly for compressing the gas entering the regenerator assembly.
During the actual use, the Brayton power cycle power generation structure adopts the 300MW supercritical carbon dioxide turbine to drive the electricity generation, the Brayton power cycle power generation structure uses supercritical carbon dioxide as the working medium, adopts reposition of redundant personnel recompression circulation. The gas entering the gas turbine 4 flows into a supercritical carbon dioxide turbine 12 connected with the heat exchanger 6 after being acted by the heat exchanger 6, and the supercritical carbon dioxide turbine 12 can drive a supercritical carbon dioxide turbine generator 13 coaxial with the supercritical carbon dioxide turbine 12 to generate power. As shown in fig. 1, the outlet of the heat exchanger 6 is connected to the inlet of the supercritical carbon dioxide turbine 12, the outlet of the supercritical carbon dioxide turbine 12 is divided into two branches, one branch is communicated with the high-temperature side fluid inlet of the high-temperature regenerator 7, and the other branch is connected to the connecting pipe 27 to be communicated to the underground for promoting coal bed gas extraction.
The working process of the Brayton power cycle power generation structure is as follows: the carbon dioxide fluid at the outlet of the supercritical carbon dioxide turbine 12 enters the high-temperature side of the high-temperature regenerator 7 for heat release, then enters the high-temperature side of the low-temperature regenerator 8 for heat exchange, and then part of the fluid is directly led to the auxiliary compressor 11 to be compressed; the other part of the fluid flows into the precooler 9 to be cooled, then enters the main compressor 10 to be compressed, then is reheated to the same temperature as the fluid directly compressed by the auxiliary compressor 11 through the low-temperature side of the low-temperature reheater 8, flows through the low-temperature side of the high-temperature reheater 7 and the heat exchanger 6 to exchange heat after being mixed, and finally flows into the supercritical carbon dioxide turbine 12 to do work, and the supercritical carbon dioxide turbine 12 drives the supercritical carbon dioxide turbine generator 13 to generate power, so that closed cycle is realized.
In this embodiment, the regenerator assembly includes a high temperature regenerator 7 communicated with an outlet of the supercritical carbon dioxide turbine 12 and a low temperature regenerator 8 connected to the high temperature regenerator 7; the compressor assembly comprises a main compressor 10 and an auxiliary compressor 11 which are connected with a low-temperature heat regenerator 8 and used for compressing gas, and a precooler 9 is arranged between the main compressor 10 and the low-temperature heat regenerator 8.
In actual use, the main compressor 10 selects 2BCL457, and the auxiliary compressor 11 selects 2MCL 1007; the Brayton power cycle power generation structure uses supercritical carbon dioxide as a working medium, and two heat regenerators are adopted in the system for avoiding the phenomenon that the heat exchanger has a pinch point in Brayton cycle to influence heat exchange and reduce cycle efficiency. The high-temperature side fluid outlet of the high-temperature heat regenerator 7 is communicated with the high-temperature side fluid inlet of the low-temperature heat regenerator 8, the high-temperature side fluid outlet of the low-temperature heat regenerator 8 is divided into two paths, one path is communicated with the inlet of the precooler 9, the other path is communicated with the inlet of the auxiliary compressor 11, the outlet of the precooler 9 is communicated with the inlet of the main compressor 10, the outlet of the main compressor 10 is communicated with the low-temperature side fluid inlet of the low-temperature heat regenerator 8, the low-temperature side fluid outlet of the low-temperature heat regenerator 8 is communicated with the low-temperature side fluid inlet of the high-temperature heat regenerator 7 after being converged with the outlet of the auxiliary compressor 11, and the low-temperature side fluid.
The utility model discloses during the use, coal seam gas fracturing promotes drainage structures extrudes coal seam 26 interior gas from the underground through discharging supercritical carbon dioxide to coal seam 26 in, from taking out and drainage in 23, and exhaust gas via can generate electricity after the gas power generation mechanism burning, and remaining gas can be carried after the burning in the brayton power cycle power generation structure, will carry extremely after the gas conversion in the brayton power cycle power generation structure, partly can be used to generate electricity, and partly accessible connecting pipe 27 is carried extremely in the coal seam gas fracturing promotes drainage in the drainage structures, promotes coal seam 26.
The above, only be the utility model discloses a preferred embodiment, it is not right the utility model discloses do any restriction, all according to the utility model discloses the technical entity all still belongs to any simple modification, change and the equivalent structure change of doing above embodiment the utility model discloses technical scheme's within the scope of protection.
Claims (7)
1. The utility model provides a coal seam gas circulation power generation system which characterized in that: the coal seam gas fracturing drainage-promoting structure comprises a coal seam gas fracturing drainage-promoting structure extending into a coal seam (26), a gas power generation mechanism connected with the coal seam gas fracturing drainage-promoting structure and used for consuming gas in the coal seam (26), and a Brayton power cycle power generation structure connected between the coal seam gas fracturing drainage-promoting structure and the gas power generation mechanism and used for promoting gas in the coal seam (26) to be discharged;
the coal bed gas fracturing pumping-promoting structure is communicated with the gas power generation mechanism through a pumping pipe (23); the gas power generation mechanism is communicated with the Brayton power cycle power generation structure through a heat exchanger (6); the Brayton power cycle power generation structure is communicated with the coal bed gas fracturing pumping promotion structure through a connecting assembly; the connecting assembly comprises a connecting pipe (27) and a control valve (28) arranged on the connecting pipe (27) and used for controlling the flow of gas in the connecting pipe (27).
2. The coal bed gas circulation power generation system of claim 1, wherein: the coal bed gas fracturing pumping-promoting structure comprises a fracturing pipe (24) extending into the coal bed (26), a valve mechanism arranged on the fracturing pipe (24), and a pressure detection mechanism arranged on the fracturing pipe (24) and used for detecting pressure change on the fracturing pipe (24);
the valve mechanism comprises a first valve component and a second valve component which are sequentially arranged along the length direction of the fracturing pipe (24), the structural sizes of the first valve component and the second valve component are the same, and the first valve component is arranged at the position, close to the connecting pipe (27), of the fracturing pipe (24); the first valve assembly and the second valve assembly respectively comprise a stop valve (17) and a pressure release valve (18) which are installed on the fracturing pipe (24), and the stop valve (17) is arranged on one side close to the connecting pipe (27).
3. The coal bed gas circulation power generation system of claim 2, wherein: the pressure detection mechanism comprises a controller (22) and a pressure sensor (21) which is arranged on the fracturing pipe (24) and connected with the controller (22), and the output end of the pressure sensor (21) is connected with the input end of the controller (22).
4. The coal bed gas circulation power generation system of claim 3, wherein: the fracturing pipe (24) is also provided with a flow meter (15) and a pressure pump (16), and the output end of the flow meter (15) is connected with the input end of the controller (22).
5. The coal bed gas circulation power generation system of claim 1, wherein: the gas power generation mechanism comprises an air separation device (2), a combustor (3) which is connected with the air separation device (2) and is used for fully combusting gas, and a gas turbine (4) which is communicated with the combustor (3); the air separation device is characterized in that an inlet of the air separation device (2) is connected with an air compressor unit (1), and an exhaust port of the gas turbine (4) is connected with a gas turbine generator set (5).
6. The coal bed gas circulation power generation system of claim 1, wherein: the Brayton power cycle power generation structure comprises a supercritical carbon dioxide turbine (12) communicated with a connecting pipe (27) and used for transmitting supercritical carbon dioxide into a coal seam (26), and a conversion mechanism connected with the supercritical carbon dioxide turbine (12) and used for converting gas in the supercritical carbon dioxide turbine (12); the conversion mechanism comprises a regenerator assembly communicated with an outlet of the supercritical carbon dioxide turbine (12) for conveying converted gas into the heat exchanger (6) and a compressor assembly communicated with the regenerator assembly for compressing the gas entering the regenerator assembly.
7. The coal bed gas circulation power generation system of claim 6, wherein: the regenerator assembly comprises a high-temperature regenerator (7) communicated with an outlet of the supercritical carbon dioxide turbine (12) and a low-temperature regenerator (8) connected with the high-temperature regenerator (7); the compressor assembly comprises a main compressor (10) and an auxiliary compressor (11) which are connected with a low-temperature heat regenerator (8) and used for compressing gas, and a precooler (9) is arranged between the main compressor (10) and the low-temperature heat regenerator (8).
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| CN202022166930.8U CN213360085U (en) | 2020-09-28 | 2020-09-28 | Coal bed gas circulation power generation system |
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| CN202022166930.8U CN213360085U (en) | 2020-09-28 | 2020-09-28 | Coal bed gas circulation power generation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114293963A (en) * | 2021-12-30 | 2022-04-08 | 中国矿业大学 | Closed-loop system for increasing permeability of underground gas extraction utilization and reinjection coal seam and working method |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114293963A (en) * | 2021-12-30 | 2022-04-08 | 中国矿业大学 | Closed-loop system for increasing permeability of underground gas extraction utilization and reinjection coal seam and working method |
| CN114293963B (en) * | 2021-12-30 | 2024-04-12 | 中国矿业大学 | Closed loop system for underground gas extraction and reinjection of coal seam anti-reflection and working method |
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