CN212317963U - Coal gas conveying temperature control system of underground coal gasification production well - Google Patents
Coal gas conveying temperature control system of underground coal gasification production well Download PDFInfo
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- CN212317963U CN212317963U CN202022147027.7U CN202022147027U CN212317963U CN 212317963 U CN212317963 U CN 212317963U CN 202022147027 U CN202022147027 U CN 202022147027U CN 212317963 U CN212317963 U CN 212317963U
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Abstract
The utility model discloses a coal underground gasification production well gas transportation temperature control system, including the coal gas output vertical shaft pipe of underground gasification stove, vertical shaft pipe ground export connects ground coal gas processing system, stretch into to the underground coal seam from the mouth of pipe of vertical shaft pipe downwards on ground and set up the cooling tube, the cooling tube is extended the degree interval and is set up the shutoff and form multistage shutoff pipe, each section shutoff pipe lateral wall distributes and is provided with the atomizing water spray nozzle, each section shutoff pipe is connected with the raceway alone, each section shutoff bottom blind end lateral wall stretches out and sets up temperature sensor, the temperature sensor signal line is drawn out from the mouth of pipe of vertical shaft pipe and is connected to a water spray controller; the ground is provided with a cooling water tank, the water conveying pipe of each section of the plugging pipe is respectively connected with the cooling water tank through a respective variable frequency pump, the water spraying controller is respectively connected with the control end of the variable frequency pump, a gas dehumidification separator is arranged on the pipeline of the vertical well pipe connected with the ground gas treatment system, and water collected by the gas dehumidification separator is cooled and then sent back to the cooling water tank.
Description
Technical Field
The utility model relates to a coal gas conveying temperature control system of a coal underground gasification production well.
Background
The underground coal gasification is characterized in that a gasification agent is injected into a fire source working surface from an injection well, the underground coal is subjected to controlled combustion in situ, crude gas containing hydrogen, carbon monoxide, methane and other gases is generated through coal pyrolysis and a series of chemical reactions of the coal, oxygen and water vapor, and the crude gas is conveyed to a production well through a production well
And conveying the mixture to the ground for utilization. The technology has the characteristics of safety, environmental protection, energy conservation and the like.
During the combustion process of coal, a large amount of heat can be generated, most of the heat is carried by coal gas, so the generated coal gas has higher temperature, the high temperature is great for the damage of a production well, and the damage is mainly shown as the deformation or the fracture of a casing of the production well, so that the gas cannot be discharged from the production well, and the normal operation of gasification is influenced. The method for solving the problem of high-temperature coal gas generally comprises three methods, namely, a plurality of production wells are arranged and are in a standby relationship with each other, and after one production well is damaged, another production well is started to keep the continuity of gas outlet. Secondly, use special steel, overcome the influence of high temperature, prolong the life of producing the well. Thirdly, a multilayer production well structure is arranged, and the temperature is reduced in a gas-gas mixing mode by injecting low-temperature inert gas. No matter which method is adopted, the safety of the production well cannot be solved
The whole production problem, meanwhile, the investment of the first two methods is higher, the investment of the third method is reduced compared with the first two methods, but the gas-gas heat exchange effect is not ideal, and the treatment difficulty of a post system is increased.
Disclosure of Invention
An object of the utility model is to provide a coal underground gasification production well coal gas transportation temperature control system
And (4) a system. The control system automatically cools the coal gas in the production well, so that the temperature of the coal gas is controlled below the temperature required by the production well casing, the problem of damage to the production well due to high temperature is effectively solved, the investment is reduced, and continuous and stable operation of gasification is guaranteed.
In order to realize the purpose, the technical scheme of the utility model is that:
a coal gas conveying temperature control system of an underground coal gasification production well comprises a coal gas output vertical well pipe of an underground gasification furnace, wherein a ground outlet of a vertical well pipe is connected with a ground coal gas treatment system, a coal gas temperature, flow, pressure and composition test station is arranged between the ground outlet of the vertical well pipe and the ground coal gas treatment system, a cooling pipe is arranged on the ground and extends downwards from a pipe orifice of the vertical well pipe to the bottom of the vertical well pipe, the cooling pipe is extended to form a plurality of sections of plugging pipes at intervals, atomized water nozzles are distributed on the side wall of each section of plugging pipe, each section of plugging pipe is independently connected with a water pipe, a temperature sensor is arranged on the side wall of the closed end at the bottom of each section of plugging pipe in a stretching mode, and a signal line of the temperature sensor is led out from the pipe; the ground is provided with a cooling water tank, the water conveying pipe of each section of the plugging pipe is respectively connected with the cooling water tank through a respective variable frequency pump, the water spraying controller is respectively connected with the control end of the variable frequency pump and a coal gas temperature, flow, pressure and composition testing station, a coal gas dehumidification separator is arranged on a pipeline of a vertical well pipe connected with a ground coal gas treatment system, and water collected by the coal gas dehumidification separator is cooled and then sent back to the cooling water tank.
The scheme is further as follows: the length of each section of plugging pipe is not less than 10 meters.
The scheme is further as follows: the cooling pipe is a composite cooling pipe formed by attaching a water delivery pipe to the inner side wall or the outer side wall of the cooling pipe and the cooling pipe in an integrated structure.
The utility model has the advantages that: the control system automatically cools the coal gas in the production well, so that the temperature of the coal gas is controlled below the temperature required by the production well casing, the problem of damage to the production well due to high temperature is effectively solved, the investment is reduced, the continuous and stable gasification operation is guaranteed, the temperature of the coal gas is controlled within the required temperature range, the production well is protected, and the gasification operation is more stable.
The present invention will be described in detail with reference to the accompanying drawings and examples.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
fig. 2 is a schematic view of a plugged tube configuration in a riser tube.
Detailed Description
A coal gas conveying temperature control system of an underground coal gasification production well comprises a coal gas output vertical well pipe 1 of an underground gasification furnace, a ground outlet of the vertical well pipe is connected with a ground coal gas treatment system 2 or a coal gas utilization system, a coal gas temperature, flow, pressure and component testing station 3 is arranged between the ground outlet of the vertical well pipe and the ground coal gas treatment system, wherein a cooling pipe 4 is arranged on the ground and extends downwards from a pipe orifice of the vertical well pipe to the bottom of the vertical well pipe, the cooling pipe is a metal hose, and the cooling pipe can be coiled and conveyed as shown in figure 1. As shown in fig. 2, the cooling pipe 4 is extended by a length interval to form a plurality of sections of plugging pipes 402 by plugs 401, or is formed by connecting a plurality of sections of plugging pipes 402, the length of each section of plugging pipe is not less than 10 meters, the side wall of each section of plugging pipe is provided with an atomizing water nozzle 403, the atomizing water nozzle is provided with a plurality of rings of small openings on the side wall of the plugging pipe, the small openings adopt a conical structure or a cross structure, water can be atomized, when gas passes through the continuous oil pipe atomizing section, atomized water and gas exchange heat, thereby achieving the effect of protecting the production well by cooling. Each section shutoff pipe independent connection has raceway 5, the cooling tube is the compound cooling tube of attached lateral wall or lateral wall and the integrative structure formation of cooling tube in the cooling tube with the raceway, stretches out at each section shutoff bottom dead end lateral wall and sets up temperature sensor 6, wherein: each plug 401 is provided with two plug sealing plates 401-1 and 401-2, and a temperature sensor 6 is led out from between the two plug sealing plates 401-1 and 401-2 to separate a temperature measuring point from water. The temperature measuring point is positioned at the lower part of the seal and fixed on the pipe wall of the cooling pipe 4, and because the temperature measuring point is firstly contacted with the coal gas and is not influenced by water, the measured temperature is the temperature of the coal gas before heat exchange. The temperature sensor signal wire is led out from the mouth of the vertical shaft pipe and connected to a water spraying controller (not shown in the figure); a cooling water tank 7 is arranged on the ground, a water conveying pipe of each section of plugging pipe is respectively connected with the cooling water tank 7 through a respective variable frequency pump 8, a water spraying controller is respectively connected with a control end of the variable frequency pump 8 and a coal gas temperature, flow, pressure and component testing station 3, a coal gas dehumidification separator 9 is arranged on a pipeline of a vertical well pipe connected with a ground coal gas treatment system 2, and water collected by the coal gas dehumidification separator is cooled and then sent back to the cooling water tank 7. And the gas temperature, flow, pressure and component testing station 3 is used for testing and analyzing the temperature, flow, pressure and components of the gas before and after dehumidification and separation, and sending the analysis result to the water spray controller to control the total amount of water.
The specific control method of the coal gas conveying temperature control system of the underground coal gasification production well comprises the following steps: after the system is set, firstly, setting temperature thresholds for starting water spraying and temperature fluctuation upper limits of the temperature thresholds sequentially from the bottommost plugging pipe to the top according to the temperature increasing gradient according to the material of the vertical well pipe and not higher than 70% of the bearable temperature; the method comprises the steps that coal gas is generated from an underground coal gasification production well, temperature sensors of all plugging sections of a cooling pipe are monitored in real time, the temperature of the generated coal gas begins to rise along with the increase of the injection flow of a gasification agent from an injection well, when the temperature of a temperature sensor of the bottommost plugging pipe reaches a temperature threshold value of water spraying, the bottommost plugging pipe of a variable frequency pump of a water conveying pipe of the bottommost plugging pipe is started to spray water, and similarly, the water spraying of all the plugging sections is started or stopped according to the fact that whether the temperature sensors of all the plugging sections reach the temperature threshold; when the temperature fluctuation reaches the fluctuation upper limit, the variable frequency pump is adjusted to increase the water spraying flow of the water pipe.
Wherein: the temperature increasing gradient is determined according to the number of the plugging pipes, and the temperature increasing gradient is not more than 5 ℃. The upper limit of the temperature fluctuation is 2 degrees celsius.
In the embodiment, although the temperature reduction control is implemented, the excessive water content will affect the transportation of the gas in the shaft pipe and also affect the quality of the gas, so the total amount of the cooling input cooling water is controlled by the following method: the total water injection flow of the plugging pipe is smaller than a coal gas water content control threshold value so as to ensure that coal gas is normally conveyed in the vertical shaft pipe, and the coal gas water content control threshold value is determined by a formula (1):
c = V × Q/H equation (1)
Wherein:
c, water injection amount of a pump, t/h (ton per hour);
v gas flow, measured by a flowmeter, Nm3H (standard square per hour);
q is the heat of the gas, the heat contained in the unit volume of the gas is related to the gas components, the gas components are monitored by the online gas temperature, flow, pressure and component testing station 3 at any time, and the heat of the gas is obtained by the formula (2):
Q=ΣV%×c/100×（T1-T0) Formula (2)
V% is the volume fraction of each component in the coal gas;
c: the specific heat capacity of each component in the coal gas is a constant;
T1the temperature of the gas measured at the ground outlet of the vertical shaft pipe;
T0the temperature is required to be reached after the temperature is required to be reduced;
h: the coefficient of latent heat of vaporization of water is a known number, and in the process of direct heat exchange, the latent heat of vaporization of water which has a large influence on temperature is mainly related to the measured gas pressure P, and the size of H can be found according to the pressure P.
Under the control of the total amount, the water delivery pressure and the flow of each section of plugging pipe are adjusted in real time through a variable frequency pump, and the temperature rise still cannot be controlled when the water content control threshold of the coal gas is reached, namely: when the temperature of the gas measured at the ground outlet of the vertical shaft pipe is equal to or higher than the tolerable temperature of the vertical shaft pipe, the water spray controller gives an alarm and informs that the injection flow of the gasifying agent is reduced.
The following is a specific application example:
a production well designed to deliver gas at a capacity of 10000Nm3H is used as the reference value. The temperature resistance of the production casing, namely the vertical shaft pipe is 250 ℃, and the operation temperature of the gasification furnace is 2.5 Ma. Coiled tubing, i.e. cooling tube 4, is first lowered to the bottom of the production casing. The system is provided with a cooling pipe to control the temperature to be 220-240 ℃. At this point the injection well begins to feed a small amount of gasification agent and ignite the coal bed. After a period of time, the temperature of the coal gas reaching the side of the temperature measurement sensor of the blocking pipe at the lowermost end of the continuous pipe is 200 ℃, a system pump is not started, and when an injection well starts to increase the flow of the gasifying agent, an automatic control valve on the ground starts to control the pressure of the gasification furnace to be 2.3-2.7 MPa. And (3) starting the variable frequency pump to inject water when the measured temperature rises to 220 ℃ along with the increase of the gasifying agent in the injection well of the gasification furnace. The normal operation of the system is indicated by observing that the temperature of the temperature measuring sensor is 200 ℃, other parameters are kept unchanged, and the amount of the injected gasification agent is gradually increased to ensure that the gas flow of the production well reaches 10000Nm3H; when the gas conveying amount of the production well is large, if the temperature is still high after the primary cooling, the secondary or multiple cooling is adopted; when the temperature reduction is caused to influence the transportation of the coal gas due to the overlarge water injection amount, the reduction of the injection flow of the gasification agent is informed, and a warning is given.
Claims (3)
1. A coal gas conveying temperature control system of an underground coal gasification production well comprises a coal gas output vertical well pipe of an underground gasification furnace, wherein a ground outlet of a vertical well pipe is connected with a ground coal gas treatment system; the ground is provided with a cooling water tank, the water conveying pipe of each section of the plugging pipe is respectively connected with the cooling water tank through a respective variable frequency pump, the water spraying controller is respectively connected with the control end of the variable frequency pump and a coal gas temperature, flow, pressure and composition testing station, a coal gas dehumidification separator is arranged on a pipeline of a vertical well pipe connected with a ground coal gas treatment system, and water collected by the coal gas dehumidification separator is cooled and then sent back to the cooling water tank.
2. The gas transport temperature control system of claim 1, wherein each of the lengths of containment tubes is no less than 10 meters in length.
3. The gas conveying temperature control system according to claim 1, wherein the cooling pipe is a composite cooling pipe formed by attaching a water pipe to the inner side wall or the outer side wall of the cooling pipe and integrating the cooling pipe.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114856525A (en) * | 2021-02-04 | 2022-08-05 | 中国石油天然气集团有限公司 | Experimental system and method for simulating gathering and transportation of crude gas produced by underground coal gasification |
| WO2023124897A1 (en) * | 2021-12-27 | 2023-07-06 | 中国石油天然气集团有限公司 | Annulus water injection distributed spray cooling method for high-temperature underground gas |
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2020
- 2020-09-27 CN CN202022147027.7U patent/CN212317963U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114856525A (en) * | 2021-02-04 | 2022-08-05 | 中国石油天然气集团有限公司 | Experimental system and method for simulating gathering and transportation of crude gas produced by underground coal gasification |
| CN114856525B (en) * | 2021-02-04 | 2024-03-01 | 中国石油天然气集团有限公司 | Experimental system and method for simulating underground gasification of coal to produce crude gas for gathering and transportation |
| WO2023124897A1 (en) * | 2021-12-27 | 2023-07-06 | 中国石油天然气集团有限公司 | Annulus water injection distributed spray cooling method for high-temperature underground gas |
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