CN217558309U - Coal in-situ pyrolysis poly-generation and carbon dioxide sequestration system - Google Patents

Abstract

The utility model belongs to the technical field of coal underground pyrolysis, in particular to a coal in-situ pyrolysis poly-generation and carbon dioxide sequestration system, which comprises a coal in-situ pyrolysis module, wherein the coal in-situ pyrolysis module is used for starting pyrolysis of a coal bed and sending pyrolysis products into a product separation processing module; the product separation processing module is used for separating, processing and utilizing the pyrolysis product and sending the pyrolysis gas into the power generation module; the waste heat recycling module is used for generating power by waste heat according to heat remained in the pyrolyzed underground coal bed; the power generation module is used for generating power by depending on the pyrolysis gas separated by the product separation processing module; and the carbon dioxide capturing and sealing module is used for capturing, processing and sealing the carbon dioxide generated in the power generation module and the product separation and processing module. The utility model discloses a carbon dioxide that the module produced is sealed up in the carbon dioxide entrapment and is deposited to obtain result separation processing module and power module to seal up its coal seam after the pyrolysis, improved the security that the carbon dioxide sealed up and deposited, the cost is reduced.

Description

Coal in-situ pyrolysis poly-generation and carbon dioxide sequestration system

Technical Field

The utility model belongs to the technical field of coal underground pyrolysis, concretely relates to coal normal position pyrolysis poly-generation and carbon dioxide sequestration system.

Background

At present, the main coal pyrolysis technology is ground pyrolysis, namely, coal is mined and transported underground, washed, selected and processed and then enters ground pyrolysis equipment to be converted into tar, coal gas and semicoke products. However, ground pyrolysis has the problems of large occupied area, excessive pyrolysis semicoke production capacity, air pollution, water pollution and the like, and compared with ground pyrolysis, underground in-situ pyrolysis of coal has the advantages of small occupied area, small carbon emission footprint, capability of preventing ground collapse and the like.

At present, the following two methods are mainly adopted for reducing carbon emission: firstly, a low-cost scheme is sought to effectively reduce the emission of carbon dioxide; secondly, the capture, utilization and sequestration (CCUS) of carbon dioxide is carried out.

Currently, the biggest challenge in developing CCUS is the cost issue, and at high intensity carbon emissions, the cost of carbon capture is relatively prohibitive. Under the prior art condition, the installation of the carbon capture device generates additional capital investment, operation and maintenance cost and the like, in addition, in the process of carbon sequestration, the transportation of carbon dioxide mainly takes a tank car as the main thing at present, the transportation and transportation amount of the tank car is small, the transportation risk is high, the investment of pipe network construction is high, the flexibility is poor, and in addition, if leakage occurs in the transportation, injection and sequestration processes, the influence is caused on the ecological environment and the production activities near the accident. Therefore, the coal in-situ pyrolysis poly-generation and carbon dioxide sequestration system has important significance for energy development.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a coal normal position pyrolysis poly-generation and carbon dioxide seal up system to solve current carbon dioxide seal up method with high costs, the technical problem of easy leakage.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a coal in-situ pyrolysis poly-generation and carbon dioxide sequestration system comprises a coal in-situ pyrolysis module, a product separation and processing module, a waste heat recovery and utilization module, a power generation module and a carbon dioxide capture and sequestration module;

the system comprises a coal in-situ pyrolysis module, a product separation processing module, a power generation module, a carbon dioxide discharge channel, a supercritical carbon dioxide outlet, a supercritical carbon dioxide collection and sealing module, a waste heat recovery and utilization module and a waste heat recovery and utilization module, wherein a product outlet of the coal in-situ pyrolysis module is connected with the product separation processing module;

the coal in-situ pyrolysis module is used for fracturing an underground coal seam, carrying out in-situ pyrolysis production on the underground coal seam by injecting a high-temperature and high-pressure heat carrier and supplying heat through mild oxidation, and sending a pyrolysis product into the product separation processing module;

the product separation processing module is used for separating, processing and utilizing the pyrolysis product and sending pyrolysis gas in the pyrolysis product into the power generation module;

the waste heat recycling module is used for generating power by waste heat according to heat remained in the pyrolyzed underground coal bed;

the power generation module is used for generating power by depending on the pyrolysis gas separated by the product separation processing module;

and the carbon dioxide capturing and sealing module is used for capturing and processing the carbon dioxide generated in the power generation module and the product separation processing module, transporting the processed carbon dioxide to the coal in-situ pyrolysis module, and injecting the processed carbon dioxide into the pyrolyzed coal bed through a production well or an injection well to perform geological sealing.

The utility model discloses a further improvement lies in: the coal in-situ pyrolysis module comprises a coal seam roof, a coal seam bottom plate, a first injection well, a horizontal well, a second injection well, a production well, a coal seam crack, an inner member vortex heat exchange device, a sandstone layer, a pressurizing device, a heating device, an ignition device and a heat exchanger;

the pressurization device delivery outlet links to each other with the first input port of heating device, the heating device delivery outlet links to each other with first injection well input port and second injection well input port respectively, be equipped with a plurality of horizontal wells between first injection well export and the second injection well export, horizontal well center department is equipped with the producing well, the producing well delivery outlet links to each other with the input port c of first heat exchanger, the input port d input heat carrier of first heat exchanger, the delivery outlet an of heat exchanger links to each other with heating device's second input port, the delivery outlet b of first heat exchanger links to each other with result separation processing module, first heat exchanger input port c links to each other with delivery outlet b, first heat exchanger input port d links to each other with delivery outlet a, ignition device links to each other with first injection well input port and second injection well input port respectively, first injection well, second injection well, producing well and horizontal well set up in the coal seam between coal seam roof and coal seam bottom plate, there are a plurality of fissures in the coal seam, inside and first injection well, second injection well bottom are equipped with interior component vortex heat transfer device.

The utility model discloses a further improvement lies in: the product separation processing module comprises a condensation separator, a dehydration tower, a heating furnace, a hydrofining reactor, a hot high-pressure separator, a hot low-pressure separator, a rectifying tower, a gas washing tower, an absorption tower, an electric tar precipitator and a separator;

an output port b of the first heat exchanger is connected with an input port of a condensation separator, a first output port of the condensation separator is connected with an input port of a dehydration tower, coal tar is fed into the dehydration tower, an output port of the dehydration tower is connected with a first input port of a heating furnace, an output port of the heating furnace is connected with a first input port of a hydrofining reactor, an output port of the hydrofining reactor is connected with an input port of a hot high-pressure separator, a first output port of the hot high-pressure separator is connected with an input port of a hot low-pressure separator, a second output port of the hot high-pressure separator is connected with a second input port of the hydrofining reactor, hydrogen generated in the hot high-pressure separator is fed into the hydrofining reactor, residual gas is discharged from the first output port of the hot low-pressure separator, a second output port of the hot low-pressure separator is connected with an input port of a rectifying tower, and the rectifying tower outputs fuel oil and chemical raw materials;

the second output port of the condensation separator is connected with the input port of the scrubbing tower, pyrolysis gas is sent into the scrubbing tower, the output port of the scrubbing tower is connected with the input port of the absorption tower, the output port of the absorption tower is connected with the input port of the electrical tar precipitator, the first output port of the electrical tar precipitator is connected with the second input port of the heating furnace, tar in the electrical tar precipitator is sent into the heating furnace, the second output port of the electrical tar precipitator is connected with the first separator, the first output port of the first separator is connected with the third input port of the hydrorefining reactor, hydrogen in the first separator is sent into the hydrorefining reactor, and the second output port of the first separator is connected with the power generation module.

The utility model discloses a further improvement lies in: the waste heat recycling module comprises a first pressure pump, a second heat exchanger, a separator, a steam turbine, a generator, a circulating water pump, a third injection well and a production well;

first pressure pump exports respectively with the third injection well, it links to each other with the second heat exchanger input port to adopt the well delivery outlet, the first delivery outlet of second heat exchanger links to each other with the second separator input port, second heat exchanger second delivery outlet links to each other with the steam turbine input port, sends steam into the steam turbine, the first delivery outlet of steam turbine links to each other with circulating water pump first input port, steam turbine second delivery outlet links to each other with the generator input port, the second separator delivery outlet links to each other with circulating water pump second input port.

The utility model discloses a further improvement lies in: the carbon dioxide sealing module comprises a booster pump, a heater and a second pressure pump;

the booster pump delivery outlet links to each other with the heater input port, the heater delivery outlet links to each other with second pressure pump input, second pressure pump output links to each other with first injection well, second injection well and producing well respectively.

The utility model discloses a further improvement lies in: the carbon dioxide sequestration module further comprises a carbon dioxide concentration detector disposed at a wellhead of the production well, the first injection well, and the second injection well.

The utility model discloses a further improvement lies in: the coal in-situ pyrolysis module also comprises a mild oxidation heat supply belt, and the mild oxidation heat supply belt is arranged in the inner layer.

The utility model discloses a further improvement lies in: and a heat-insulating sleeve device is arranged on the production well.

The utility model discloses a further improvement lies in: the power generation module comprises a gas turbine and a steam turbine.

Compared with the prior art, the utility model discloses at least, including following beneficial effect:

1. the utility model discloses a obtain coal-based special fuel with coal normal position pyrolysis, alleviate the problem that china's oil gas resource is deficient and externally dependence degree is high, utilize the gas electricity generation through the poly-generation in addition, improved energy efficiency, reduce the energy consumption, be the powerful way of realizing the clean energy of coal-based.

2. The utility model discloses a combine the carbon dioxide entrapment to seal up and deposit the module, the carbon dioxide that the entrapment system produced to coal seam through after the pyrolysis carries out the geology and seals up and deposit, and the semicoke structure and the geological environment that produce after the pyrolysis have improved the security that carbon dioxide sealed up and deposited for carbon seals up and has provided natural condition, reduce and seal up the cost of depositing, are one kind and handle carbon dioxide's effective means.

3. The utility model discloses utilize the waste heat in normal position pyrolysis back coal seam to generate electricity, reduced the system energy consumption.

4. The utility model discloses a controllable gentle oxidation heat supply, the control combustion part coal seam is exothermic through the coal burning and is impeld all the other coal seam pyrolysis, improves coal normal position pyrolysis efficiency, reaches reduction of erection time's purpose.

5. The utility model discloses an inner member vortex heat transfer device plays the effect of reinforceing the heat transfer in the injection heat carrier pyrolysis stage, and on the other hand plays the static mixer effect in carbon dioxide seal up the stage of depositing, reinforces the absorption and the seal up of carbon dioxide deposit.

6. The utility model discloses a carry out the absorption of carbon dioxide in the flow with amine ionic liquid, can effectively reduce the carbon emission of system to can amine ionic liquid accessible heating desorption, make absorbent can used repeatedly, reduce cost.

Drawings

The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention. In the drawings:

FIG. 1 is a system block diagram of a coal in-situ pyrolysis poly-generation and carbon dioxide sequestration system of the present invention;

FIG. 2 is a schematic structural diagram of a coal in-situ pyrolysis module of the coal in-situ pyrolysis poly-generation and carbon dioxide sequestration system of the present invention;

FIG. 3 is a schematic structural diagram of a product separation processing module of the system for coal in-situ pyrolysis poly-generation and carbon dioxide sequestration of the present invention;

FIG. 4 is a schematic structural diagram of a waste heat recycling module of the system for coal in-situ pyrolysis poly-generation and carbon dioxide sequestration of the present invention;

FIG. 5 is a schematic structural view of a carbon dioxide sequestration module of the system for coal in-situ pyrolysis and poly-generation and carbon dioxide sequestration of the present invention;

fig. 6 is the utility model relates to a coal normal position pyrolysis poly-generation and carbon dioxide sequestration system has well arrangement connected mode schematic diagram of sandstone layer.

In the figure, 1, a coal seam roof; 2. a coal seam; 3. a coal seam floor; 4. a first injection well; 5. horizontal wells; 6. a second injection well; 7. a production well; 8. a mild oxidative heating zone; 9. coal seam cracking; 10. the inner component vortex heat exchange device; 11. a sandstone layer; 12. a pressurizing device; 13. a heating device; 14. an ignition device; 15. a first heat exchanger; 16. a second coal seam; 17. a third coal seam; 18. a second sandstone layer; 20. a product separation processing module; 21. a condensation separator; 22. a dehydration tower; 23. a heating furnace; 24. a hydrofining reactor; 25. a hot high pressure separator; 26. a hot low pressure separator; 27. a rectifying tower; 28. a gas washing tower; 29. an absorption tower; 30. an electrical tar precipitator; 31. a first separator; 50. a power generation module; 41. a first pressure pump; 42. a second heat exchanger; 43. a second separator; 44. a water circulating pump; 45. a steam turbine; 46. a generator; 47. a third injection well; 48. A production well; 50 a power generation module; 51. a booster pump; 52. a heater; 53. a second pressure pump; 54. a carbon dioxide concentration detector.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that, in the case of no conflict, the embodiments and features of the embodiments of the present invention may be combined with each other.

The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.

Example 1

As shown in fig. 1, a coal in-situ pyrolysis poly-generation and carbon dioxide sequestration system comprises a coal in-situ pyrolysis module, a product separation processing module 20, a waste heat recovery and utilization module, a power generation module 50 and a carbon dioxide capture sequestration module;

a product outlet of the coal in-situ pyrolysis module is connected with the product separation processing module, a fuel gas outlet of the product separation processing module 20 is connected with the power generation module 50, carbon dioxide discharge channels of the product separation processing module 20 and the power generation module 50 are connected with the carbon dioxide capture and sealing module, a supercritical carbon dioxide outlet of the carbon dioxide capture and sealing module is connected with the coal in-situ pyrolysis module, a water channel outlet of the waste heat recovery and utilization module is connected with the coal in-situ pyrolysis module, and a high-temperature steam outlet of the coal in-situ pyrolysis module is connected with the waste heat recovery and utilization module;

the coal in-situ pyrolysis module is used for a production part, fracturing a coal bed through an injection well, communicating the production well, injecting water, air, a propping agent and heat through the injection well, starting pyrolysis of the coal bed and generating pyrolysis volatile components, and extracting oil and gas products to the ground through catalytic regulation and upgrading in the production well and then leading the oil and gas products into the product separation and processing module 20;

the product separation processing module 20 is used for separating, processing and utilizing oil and gas products, condensing and separating the oil and gas products, carrying out secondary purification processing on tar products, and recycling one part of gas products after the gas products are separated and introducing the other part of gas products into the power generation module;

the waste heat recycling module is used for generating power by using a large amount of waste heat of the underground coal bed after pyrolysis and supplying power to the system;

the power generation module 50 is used for generating power by depending on the fuel gas separated by the product separation processing module 20 so as to supply the energy consumption of the whole system;

the carbon dioxide capturing and sealing module comprises the technological processes of carbon dioxide purification capturing, carbon dioxide processing, pipeline transportation and carbon dioxide sealing. The system is used for capturing carbon dioxide generated in the power generation module 50, transporting the carbon dioxide to a coal in-situ pyrolysis module through a pipeline after processing, and injecting the carbon dioxide into a coal bed after pyrolysis through a production well or an injection well for geological storage.

As shown in fig. 2, the coal in-situ pyrolysis module comprises a coal seam roof 1, a coal seam 2, a coal seam floor 3, a first injection well 4, a horizontal well 5, a second injection well 6, a production well 7, a mild oxidation heat supply zone 8, coal seam cracks 9, an inner member vortex heat exchange device 10, a sandstone layer 11, a pressurizing device 12, a heating device 13, an ignition device 14 and a first heat exchanger 15;

an output port of a pressurizing device 12 is connected with a first input port of a heating device 13, an output port of the heating device 13 is respectively connected with an input port of a first injection well 4 and an input port of a second injection well 6, a horizontal well 5 is arranged between the output port of the first injection well 4 and the output port of the second injection well 6, a production well 7 is arranged at the center of the horizontal well 5, an output port of the production well 7 is connected with an input port c of a first heat exchanger 15, a heat carrier is input into an input port d of the first heat exchanger 15, the heat carrier is water, nitrogen or air, etc., an output port a of the first heat exchanger 15 is connected with a second input port of the heating device 13, an output port b of the first heat exchanger 15 is connected with a product separation and processing module 20, an input port c of the first heat exchanger 15 is connected with an output port b, an input port d of the first heat exchanger 15 is connected with an output port a, an ignition device 14 is respectively connected with the input port of the first injection well 4 and the input port of the second injection well 6, the first injection well 4, the second injection well 6, the production well 7 and the horizontal well 5 are arranged in a vortex device arranged between a coal seam top plate 1 and a coal seam bottom plate 3, a plurality of coal seam 2 with mild fissures 9 and an oxidation coal seam zone 8, the heating coal bed 5, and the bottom of the first well 4 and the second well 6 are provided with a heat exchange device 10;

the production well 7 is provided with a heat-insulating sleeve device, so that the temperature inside the production well can be ensured to be higher than 360 ℃, and the blockage caused by the condensation and adhesion of pyrolysis products on the pipe wall in the product extraction process can be prevented.

The inner member vortex heat exchange device 10 is arranged in the first injection well 4, the second injection well 6 and the horizontal well 5, and can strengthen heat carrier heat exchange in a heat carrier injection stage; the device plays a role of a static mixer in the carbon dioxide sequestration stage, and the absorption and sequestration of the carbon dioxide are enhanced.

The energy consumption required by the heating device 13 is provided by clean energy sources such as solar energy, wind energy and the like.

As shown in fig. 3, the product separation processing module 20 includes a condensation separator 21, a dehydration tower 22, a heating furnace 23, a hydrofining reactor 24, a hot high-pressure separator 25, a hot low-pressure separator 26, a rectifying tower 27, a scrubber 28, an absorption tower 29, an electrical tar precipitator 30 and a separator 31;

an output port b of the first heat exchanger 15 is connected with an input port of a condensation separator 21, a first output port of the condensation separator 21 is connected with an input port of a dehydration tower 22, coal tar is fed into the dehydration tower 22, an output port of the dehydration tower 22 is connected with a first input port of a heating furnace 23, an output port of the heating furnace 23 is connected with a first input port of a hydrorefining reactor 24, an output port of the hydrorefining reactor 24 is connected with an input port of a hot high-pressure separator 25, a first output port of the hot high-pressure separator 25 is connected with an input port of a hot low-pressure separator 26, a second output port of the hot high-pressure separator 25 is connected with a second input port of the hydrorefining reactor 24, hydrogen generated in the hot high-pressure separator 25 is fed into the hydrorefining reactor 24, the first output port of the hot low-pressure separator 26 discharges residual gas, the second output port of the hot low-pressure separator 26 is connected with an input port of a rectifying tower 27, and the rectifying tower 27 outputs fuel oil and chemical raw materials;

a second output port of the condensation separator 21 is connected with an input port of the scrubbing tower, the pyrolysis gas is sent into the scrubbing tower 28, an output port of the scrubbing tower 28 is connected with an input port of an absorption tower 29, an output port of the absorption tower 29 is connected with an input port of an electric tar precipitator 30, a first output port of the electric tar precipitator 30 is connected with a second input port of the heating furnace 23, tar in the electric tar precipitator 30 is sent into the heating furnace 23, a second output port of the electric tar precipitator 30 is connected with a first separator 31, a first output port of the first separator 31 is connected with a third input port of the hydrofining reactor 24, hydrogen in the first separator 31 is sent into the hydrofining reactor 24, a second output port of the first separator 31 is connected with a power generation module 50, and the pyrolysis gas is sent into the power generation module 50 for power generation;

as shown in fig. 4, the waste heat recycling module includes a first pressure pump 41, a second heat exchanger 42, a separator 43, a steam turbine 45, a generator 46, and a circulating water pump 44;

an output port of the first pressure pump 41 is connected with a third injection well 47, an output port of a production well 48 is connected with an input port of the second heat exchanger 42, a first output port of the second heat exchanger 42 is connected with an input port of the second separator 43, a second output port of the second heat exchanger 42 is connected with an input port of the steam turbine 45, secondary steam is sent to the steam turbine 45, a first output port of the steam turbine 45 is connected with a first input port of the circulating water pump 44, a second output port of the steam turbine 45 is connected with an input port of the generator 46, and an output port of the second separator 43 is connected with a second input port of the circulating water pump 44.

The power generation module comprises a gas turbine and a steam turbine.

As shown in fig. 5, the carbon dioxide sequestration module includes a booster pump 51, a heater 52, a second pressure pump 53, and a carbon dioxide concentration detector 54;

an output port of the booster pump 51 is connected with an input port of the heater 52, an output port of the heater 52 is connected with an input port of the second pressure pump 53, an output port of the second pressure pump 53 is connected with the injection well, and the carbon dioxide concentration detector 54 is arranged at each well head.

Example 2

A coal in-situ pyrolysis poly-generation and carbon dioxide sequestration method comprises the following steps:

s1, fracturing a coal seam 2 through a first injection well 4 and a second injection well 6 to generate coal seam fractures 9 and a mild oxidation heat supply zone 8 in the coal seam 2, and injecting a propping agent into the coal seam fractures 9 through the first injection well 4 and the second injection well 6;

s2, arranging an inner member vortex heat exchange device 10 towards the interior of the horizontal well 5 and the bottoms of the first injection well 4 and the second injection well 6; the ignition device 14 controls the mild oxidation heat supply zone to burn, and the coal bed to be pyrolyzed is heated;

s3, generating a high-temperature and high-pressure heat carrier through a pressurizing device 12 and a heating device 13, injecting the high-temperature and high-pressure heat carrier into the coal bed 2 through a first injection well 4 and a second injection well 6, and starting in-situ pyrolysis of coal underground under the enhanced heat exchange action of an inner member vortex heat exchange device 10 and a propping agent in a horizontal well 5;

s4, extracting pyrolysis products through the production well 7, sending the pyrolysis products into the product separation processing module 20 through the first heat exchanger 15, and sending heat generated in the pyrolysis process into the heating device 13 through the first heat exchanger 15 to generate high-temperature high-pressure steam to be injected into the coal bed 2 again;

s5, primarily separating the pyrolysis product into a coal tar product and a pyrolysis gas product through a condensation separator 21; the coal tar product enters a dehydration tower 22 for dehydration, then enters a heating furnace 23 for heating, then enters a hydrofining reactor 24 for hydrogenation reaction, the coal tar product leaving the hydrofining reactor 24 enters a thermal high-pressure separator 25 for separating hydrogen and then is sent to the hydrofining reactor 24 for recycling, then enters a thermal low-pressure separator 25 for separating residual gas, and finally enters a rectifying tower 27 for separation into oil gas products; the pyrolysis gas product is firstly subjected to gas washing absorption treatment by a gas washing tower 28 and an absorption tower 29, then enters an electric tar precipitator 30 to collect residual tar and is sent to a heating furnace 23, then the pyrolysis gas product is sent to a first separator 31 to separate hydrogen and residual heat pyrolysis gas, wherein the hydrogen enters a tar hydrofining reactor 24, and the pyrolysis gas enters a power generation module 50 for power generation;

s6, pumping water into the pyrolyzed coal seam 2 through a third injection well 47 by using a first pressure pump 41, heating by using waste heat of the pyrolyzed coal seam, extracting a waste heat product from a production well 48, and conveying the waste heat product into a second heat exchanger 42, evaporating the water into high-temperature steam by the second heat exchanger 42 depending on heat in the waste heat product, conveying the high-temperature steam into a steam turbine 45 to drive a generator 46 to generate electricity, conveying the waste heat product in the second heat exchanger 42 into a second separator 43, separating oil and gas products carried in the waste heat product by the second separator 43, and conveying the water into a circulating water pump 44 for reuse;

s7, sending carbon dioxide in the power generation module 50 and the product separation module 20 into a carbon dioxide capturing and sealing module, absorbing the carbon dioxide by absorption liquid in the carbon dioxide capturing and sealing module, heating for desorption, collecting carbon dioxide gas, and recycling the absorption liquid after heating for desorption; the collected carbon dioxide gas is processed into a supercritical state by a booster pump 51 and a heater 52, and the supercritical carbon dioxide is injected into the underground coal seam 2 from the first injection well 4, the second injection well 6 or the production well 7 through a second pressure pump 53 for geological sequestration.

The preparation method of the proppant comprises the following steps: mixing and grinding a carrier material and red mud, and then carrying out homogenization and refinement treatment to obtain mixed powder, wherein the particle size range of the mixed powder is 0.4-0.2 mm; uniformly mixing the mixed powder with an adhesive, and then feeding the mixture into a granulator for granulation to obtain spherical particles; and drying the pellets and then calcining at 1000-1200 ℃ to obtain the proppant for underground in-situ pyrolysis of coal.

The carrier material in the mixed material accounts for 35-60 wt% of the mass of the mixed powder; the red mud accounts for 40 to 65 weight percent of the mass of the mixed powder. The carrier material is one or more of ceramsite, metal aluminum ball and resin coated sand, and the adhesive is one or more of phenolic resin, polyurethane and sodium silicate.

The preparation method of the organic amine ionic liquid comprises the following steps: weighing organic amine and acid with equal molar weight, respectively placing the organic amine and the acid in ice water, stirring and dissolving, slowly adding the acid solution into the organic amine solution after stirring uniformly, then uniformly stirring and reacting, continuously performing rotary evaporation at the temperature of 80-100 ℃, and finally drying for 24 hours at the temperature of 60-80 ℃.

The organic amine solution is prepared by mixing one or More of Ethanolamine (MEA), diethanolamine (DEA), methyldiethanolamine (MDEA), piperazine (PZ) and Diethylenetriamine (DETA); the acid solution is one of hexafluorophosphoric acid, tetrafluoroboric acid, sulfuric acid and acetic acid.

When injecting first injection well 4 and second injection well 6 with high temperature high pressure heat carrier, the low-speed intensification earlier, when the temperature of coal seam 2 reached 200 ℃, the heating of beginning rapid heating up improves the initial pyrolysis rate in coal seam, increases pyrolysis tar yield.

The waste heat recycling module is used for generating power by utilizing a large amount of waste heat generated after coal in-situ pyrolysis, and effectively utilizing energy.

The waste heat recycling module utilizes coal bed waste heat after pyrolysis to heat steam, and the waste heat product can be normally used when the temperature is more than 100 ℃, and can be stopped to be used when the temperature is lower than 100 ℃.

Absorbing carbon dioxide in the power generation module 50 and the product separation processing module by using organic amine ionic liquid as absorption liquid;

and when the absorbed mixed solution is heated to 150 ℃, carbon dioxide can be desorbed, and the obtained organic amine ionic liquid absorption solution can be repeatedly used.

And carrying out geological sequestration of supercritical carbon dioxide by utilizing the coal bed after underground pyrolysis, wherein the coal bed after pyrolysis provides natural conditions for sequestration of the carbon dioxide.

And the injection well and the production well in the coal in-situ pyrolysis module are used for injecting supercritical carbon dioxide, so that the construction cost is reduced.

By injecting carbon dioxide, residual pyrolytic gas adsorbed in coal rock and semicoke is removed, the pyrolytic gas is further recovered, and the recovery ratio is improved.

The waste heat of the geological environment after the underground coal pyrolysis is utilized to stabilize the state of the supercritical carbon dioxide and reduce the risk of carbon dioxide leakage.

Example 3

As shown in fig. 6, a well arrangement mode of a coal in-situ pyrolysis poly-generation and carbon dioxide sequestration system includes a coal seam roof 1, a coal seam 2, a sandstone layer 11, a second coal seam 16, a second sandstone layer 18, a third coal seam 17, a first injection well 4, a second injection well 6, a horizontal well 5, a production well 7, a coal seam floor 3, a mild oxidation heat supply zone 8 and an inner member vortex heat exchange device 10, the coal seam 2 is arranged below the coal seam roof 1, the sandstone layer 11 is arranged below the coal seam 2, the second coal seam 16 is arranged below the sandstone layer 11, the second coal seam 18 is arranged below the second coal seam 16, the third coal seam 17 is arranged below the third coal seam 17, the injection well 3 is arranged below the third coal seam 17, the first injection well 4, the second injection well 6 and the production well 7 sequentially penetrate through the coal seam roof 1, the coal seam 2, the sandstone layer 11, the second coal seam 16, the second sandstone layer 18, the third injection well 17, the fracture 2 and the third sandstone layer 17, the coal seam 5 is arranged in the second coal seam 16, the mild oxidation heat supply zone 8 is arranged in the coal seam 11 and the second sandstone layer 18.

Controlling the middle part of the burning coal bed to heat the rest coal bed aiming at the underground thick coal bed and the thick sandstone layer; and aiming at multiple coal seams and thin sandstone layers, the middle coal seam is controlled to be burnt, and the pyrolysis efficiency of the upper coal seam and the lower coal seam is enhanced.

It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of the invention or which are equivalent to the scope of the invention are embraced by the invention.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents of the embodiments of the invention may be made without departing from the spirit and scope of the invention, which should be construed as falling within the scope of the claims of the invention.

Claims (9)

1. The system is characterized by comprising a coal in-situ pyrolysis module, a product separation processing module (20), a waste heat recycling module, a power generation module (50) and a carbon dioxide capturing and sealing module;

the product outlet of the coal in-situ pyrolysis module is connected with the product separation processing module, the fuel gas outlet of the product separation processing module (20) is connected with the power generation module (50), the carbon dioxide discharge channels of the product separation processing module (20) and the power generation module (50) are connected with the carbon dioxide capture and storage module, the supercritical carbon dioxide outlet of the carbon dioxide capture and storage module is connected with the coal in-situ pyrolysis module, the water channel outlet of the waste heat recovery and utilization module is connected with the coal in-situ pyrolysis module, and the high-temperature steam outlet of the coal in-situ pyrolysis module is connected with the waste heat recovery and utilization module;

the coal in-situ pyrolysis module is used for fracturing an underground coal bed, carrying out in-situ pyrolysis production on the underground coal bed by injecting a high-temperature and high-pressure heat carrier and supplying heat through mild oxidation, and sending a pyrolysis product into the product separation processing module (20);

the product separation and processing module (20) is used for separating, processing and utilizing the pyrolysis products and sending pyrolysis gas in the pyrolysis products into the power generation module (50);

the waste heat recycling module is used for generating power by waste heat according to heat remained in the pyrolyzed underground coal bed;

the power generation module (50) is used for generating power by depending on the residual pyrolysis gas separated by the product separation processing module (20);

and the carbon dioxide capturing and sealing module is used for capturing and processing the carbon dioxide generated in the power generation module (50) and the product separation processing module (20), transporting the processed carbon dioxide to the coal in-situ pyrolysis module, and injecting the processed carbon dioxide into the pyrolyzed coal bed through a production well or an injection well to carry out geological sealing.

2. The system for poly-generation by in-situ coal pyrolysis and carbon dioxide sequestration as claimed in claim 1, wherein the in-situ coal pyrolysis module comprises a coal seam roof (1), a coal seam (2), a coal seam floor (3), a first injection well (4), a horizontal well (5), a second injection well (6), a production well (7), coal seam fractures (9), an inner member vortex heat exchange device (10), a sandstone layer (11), a pressurizing device (12), a heating device (13), an ignition device (14) and a first heat exchanger (15);

the output port of the pressurizing device (12) is connected with a first input port of a heating device (13), the output port of the heating device (13) is respectively connected with a first injection well (4) input port and a second injection well (6) input port, a plurality of horizontal wells (5) are arranged between the first injection well (4) output port and the second injection well (6) output port, a production well (7) is arranged at the center of each horizontal well (5), the output port of the production well (7) is connected with an input port c of a first heat exchanger (15), a heat carrier is input at an input port d of the first heat exchanger (15), an output port a of the first heat exchanger (15) is connected with a second input port of the heating device (13), an output port b of the first heat exchanger (15) is connected with a product separation and processing module (20), an input port c of the first heat exchanger (15) is connected with an output port b, an input port d of the first heat exchanger (15) is connected with an output port a, an ignition device (14) is respectively connected with the input ports of the first injection well (4) and the second injection well (6), a coal seam roof (4), a plurality of the coal seam (7), a plurality of the injection wells (7) and a plurality of the injection wells (3) are arranged between the coal seam floor (9), and an inner member vortex heat exchange device (10) is arranged inside the horizontal well (5) and at the bottoms of the first injection well (4) and the second injection well (6).

3. The coal in-situ pyrolysis poly-generation and carbon dioxide sequestration system according to claim 2, wherein the product separation processing module (20) comprises a condensation separator (21), a dehydration tower (22), a heating furnace (23), a hydrofining reactor (24), a hot high-pressure separator (25), a hot low-pressure separator (26), a rectifying tower (27), a scrubbing tower (28), an absorption tower (29), an electric tar precipitator (30) and a separator (31);

an output port b of the first heat exchanger (15) is connected with an input port of a condensation separator (21), a first output port of the condensation separator (21) is connected with an input port of a dehydration tower (22), coal tar is fed into the dehydration tower (22), an output port of the dehydration tower (22) is connected with a first input port of a heating furnace (23), an output port of the heating furnace (23) is connected with a first input port of a hydrofining reactor (24), an output port of the hydrofining reactor (24) is connected with an input port of a hot high-pressure separator (25), a first output port of the hot high-pressure separator (25) is connected with an input port of a hot low-pressure separator (26), a second output port of the hot high-pressure separator (25) is connected with a second input port of the hydrofining reactor (24), hydrogen generated in the hot high-pressure separator (25) is fed into the hydrofining reactor (24), the first output port of the hot low-pressure separator (26) discharges residual gas, a second output port of the hot low-pressure separator (26) is connected with an input port of a rectifying tower (27), and the chemical distillation tower (27) outputs fuel oil and chemical raw materials;

and a second output port of the condensation separator (21) is connected with an input port of the scrubbing tower (28), the pyrolysis gas is sent into the scrubbing tower (28), an output port of the scrubbing tower (28) is connected with an input port of the absorption tower (29), an output port of the absorption tower (29) is connected with an input port of the electrical tar precipitator (30), a first output port of the electrical tar precipitator (30) is connected with a second input port of the heating furnace (23), tar in the electrical tar precipitator (30) is sent into the heating furnace (23), a second output port of the electrical tar precipitator (30) is connected with the first separator (31), a first output port of the first separator (31) is connected with a third input port of the hydrofining reactor (24), hydrogen in the first separator (31) is sent into the hydrofining reactor (24), and a second output port of the first separator (31) is connected with the power generation module (50).

4. The system for coal in-situ pyrolysis poly-generation and carbon dioxide sequestration as claimed in claim 2, wherein the waste heat recovery and utilization module comprises a first pressure pump (41), a second heat exchanger (42), a separator (43), a steam turbine (45), a generator (46), a circulating water pump (44), a third injection well (47) and a production well (48);

first force pump (41) delivery outlet respectively with third injection well (47), production well (48) delivery outlet links to each other with second heat exchanger (42) input port, the first delivery outlet of second heat exchanger (42) links to each other with second separator (43) input port, second heat exchanger (42) second delivery outlet links to each other with steam turbine (45) input port, sends steam into steam turbine (45), the first delivery outlet of steam turbine (45) links to each other with circulating water pump (44) first input port, steam turbine (45) second delivery outlet links to each other with generator (46) input port, second separator (43) delivery outlet links to each other with circulating water pump (44) second input port.

5. The system for poly-generation and carbon dioxide sequestration by in-situ coal pyrolysis according to claim 1, wherein the carbon dioxide sequestration module comprises a booster pump (51), a heater (52) and a second pressure pump (53);

the booster pump (51) delivery outlet links to each other with heater (52) input port, heater (52) delivery outlet links to each other with second force pump (53) input port, second force pump (53) delivery outlet links to each other with first injection well (4), second injection well (6) and production well (7) respectively.

6. The coal in-situ pyrolysis poly-generation and carbon dioxide sequestration system according to claim 5, characterized in that the carbon dioxide sequestration module further comprises a carbon dioxide concentration detector (54), and the carbon dioxide concentration detector (54) is arranged at the wellhead of the production well (7), the first injection well (4) and the second injection well (6).

7. The coal in-situ pyrolysis poly-generation and carbon dioxide sequestration system according to claim 2, characterized in that the coal in-situ pyrolysis module further comprises a mild oxidation heat supply belt (8), and the mild oxidation heat supply belt (8) is arranged in the coal seam (2).

8. The system for poly-generation and carbon dioxide sequestration by in-situ coal pyrolysis according to claim 2, characterized in that the production well (7) is provided with a heat-insulating sleeve device.

9. The system for coal in-situ pyrolysis poly-generation and carbon dioxide sequestration as claimed in claim 1, wherein the power generation module comprises a gas turbine and a steam turbine.

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