Coal underground gasification product collecting device and purification and separation method

Abstract

The invention belongs to the technical field of clean coal, and particularly relates to a coal underground gasification product collecting device and a purification and separation method.The coal underground gasification product collecting device comprises a gasification furnace, a solid separator, a tar extraction device and a negative pressure gas collecting device, and the gasification furnace is communicated with the solid separator through a pipeline; the solid separator is communicated with a tar extraction device through a high-temperature-resistant rubber hose, a negative-pressure gas collection device is arranged above the tar extraction device, the tar extraction device is further provided with an oil discharge pipeline, and the oil discharge pipeline is communicated with the tar extraction device through a corrosion-resistant hose; according to the invention, carbon tetrachloride is used as an extraction agent to separate tar to obtain pure gas, the organic solvent distillation device is used for heating and distilling the mixed liquid to gasify the carbon tetrachloride with low boiling point so as to obtain pure tar, and the gasified carbon tetrachloride flows back to the extraction device through the negative pressure gas collection device to realize recycling.

Description

Technical Field

[0001] The invention belongs to the technical field of clean coal, and in particular relates to a device for collecting underground coal gasification products and a purification and separation method. Background Art

[0002] Coal is a new technology for fluidized coal mining, which converts solid coal resources into gas and liquid. It is a clean and efficient technology. With the proposal of the "dual carbon target", underground coal gasification has attracted much attention. Coal is ignited and burned in a gasifier to produce a gasification reaction. The output includes gaseous products (effective components such as hydrogen, methane and carbon monoxide), liquid products (tar) and solid products (coal ash and residue). Among them, tar and gaseous products are the main economic products. At present, most of the research focuses on geological evaluation and selection of underground coal gasification, gasification process research, etc. There is a lack of equipment and methods for purifying, separating and collecting gasification products, which affects the economic benefits of the final gasification products. The discharge of gaseous products and tar causes environmental pollution.

[0003] A Chinese patent with patent announcement number CN105013800B discloses a method for recovering a composite extractant in the extraction and separation process of coal tar waste residue, which is to send a mixed solution containing a composite extractant and tar obtained after extracting and separating coal tar waste residue into a distillation tank, then add water and heat to boiling, and the azeotrope formed by the composite extractant and water evaporates from the mixed solution, condense and recover the distillate to obtain an oil-water mixture, and stand to separate the composite extractant and water, which are returned to the system for recycling. The above invention has low tar extraction efficiency, can only preliminarily extract and separate tar, and cannot achieve purification and collection of gaseous products. Therefore, it is urgent for those skilled in the art to solve the above technical problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is that in the above-mentioned prior art, the tar extraction efficiency is low, and there is a lack of devices and methods for purifying, separating and collecting gasification products, which affects the economic benefits of the final gasification products, and the discharge of gas products and tar causes environmental pollution.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A device for collecting underground coal gasification products comprises a gasifier, a solid separator, a tar extraction device and a negative pressure gas collection device; the gasifier is connected to the solid separator through a pipeline, the solid separator is connected to the tar extraction device through a high temperature resistant rubber hose, the negative pressure gas collection device is arranged above the tar extraction device, and the tar extraction device is also provided with an oil discharge pipeline, which is connected to the tar extraction device through a corrosion resistant hose.

[0007] By adopting the above technical scheme, solid particles (such as coal ash) in the gas are removed by a solid separator, which can prevent these particles from causing pipeline blockage or equipment damage during subsequent processing. The tar extraction device utilizes the selective dissolution characteristics of carbon tetrachloride organic solvent to effectively separate tar from the gas, thereby obtaining a purer gaseous product. By utilizing the difference in boiling points of different substances, the mixture is heated and distilled to effectively separate tar from carbon tetrachloride, thereby realizing the recovery of tar and the recycling of carbon tetrachloride. The negative pressure gas collection device ensures the collection of effective gas products, while avoiding the mixing of liquid components such as tar, ensuring the dryness and purity of the gas. Through the effective separation and recovery process, the pollution to the environment is reduced. The design of the solid separator and the tar extraction device takes into account the safety of operation, such as preventing tar solidification by controlling the temperature. Carbon tetrachloride is used as a recyclable solvent to reduce operating costs and also reduce the demand for new solvents. The efficient separation technology enables valuable by-products (such as tar) to be recycled and reused, thereby improving the economic benefits of the overall process.

[0008] Furthermore, the solid-liquid separator includes a U-shaped tube, a replaceable filter and a heating wire group; the replaceable filter is installed on the U-shaped tube through a flange, the heating wire group is spirally wound on the outer wall of the U-shaped tube, and the heating wire group is electrically connected to the heating wire access port of the temperature control panel.

[0009] By adopting the above technical solution, the replaceable filter screen is installed on the U-shaped tube one through the flange, and this design makes the filter screen easy to replace. When the filter screen is blocked or damaged due to long-term use, it can be quickly and conveniently replaced, thereby ensuring the continuity of the filtering efficiency. Filter screens with different apertures can be selected as needed to meet the filtering requirements of solid particles of different particle sizes and improve the filtering effect. The heating wire group spirally wound on the outer wall of the U-shaped tube one is connected to the temperature control panel, which can accurately control the temperature inside the U-shaped tube. By maintaining a certain temperature (for example, 400°C), the tar component in the gas can be effectively prevented from cooling and adhering to the filter screen, extending the service life of the filter screen and reducing the maintenance frequency. The filter screen is fixed by the flange installation method, which is not only convenient for installation and disassembly, but also ensures the sealing of the connection and reduces the risk of leakage. The heating wire group can be adjusted by the temperature control panel to realize automatic temperature control, simplify the operation process, and reduce the possibility of human error.

[0010] Furthermore, the tar extraction device includes a high-temperature resistant rubber hose, a U-shaped tube 2, an organic solvent and a spiral condenser; the gas outlet end of the U-shaped tube 1 is connected to the gas inlet end of the U-shaped tube 2 through the high-temperature resistant rubber hose, and pistons are provided on the gas outlet end of the U-shaped tube 1 and the gas inlet end of the U-shaped tube 2, and the high-temperature resistant rubber hose penetrates the piston and probes into the U-shaped tube 1 and the U-shaped tube 2; the U-shaped tube 2 is filled with an organic solvent, and the organic solvent is carbon tetrachloride, and the spiral condenser is wound around the outer wall of the U-shaped tube 2.

[0011] By adopting the above technical solution, since tar can be dissolved in carbon tetrachloride, while effective gas products such as hydrogen, methane, and carbon monoxide are insoluble in carbon tetrachloride, carbon tetrachloride can be used as an extracting liquid to effectively separate tar from gaseous products, thereby obtaining pure gas. The structure of the U-shaped tube 2 helps to increase the contact time between the gas and the organic solvent, thereby improving the extraction efficiency. At the same time, this design is also convenient for observing and controlling the extraction process. The spiral condenser tube wound on the outer wall of the U-shaped tube 2 controls the temperature in the U-shaped tube by water cooling or other cooling media, and is usually maintained at a relatively low temperature (e.g., 25° C.), which is lower than the boiling point of all tar components, so that the tar is liquefied, while the gas components remain in a gaseous state, thereby achieving more effective separation. The piston is provided on the gas outlet end of the U-shaped tube 1 and the gas inlet end of the U-shaped tube 2. Such a design allows the gas flow to be closed or adjusted when necessary, thereby increasing the flexibility of operation. In addition, the presence of the piston is also helpful for the maintenance and replacement of the high-temperature resistant rubber hose. The high-temperature resistant rubber hose passes through the piston and extends into the U-tube one and the U-tube two. The high-temperature resistant rubber hose not only ensures the continuity of gas transmission, but also provides good sealing performance to prevent leakage.

[0012] Furthermore, the negative pressure gas collecting device includes a polytetrafluoroethylene membrane, a negative pressure fan and a gas collecting pipeline; the negative pressure fan is connected to the gas collecting pipeline through a pipeline, and the polytetrafluoroethylene membrane is arranged at the bottom of the gas collecting pipeline.

[0013] By adopting the above technical solution, by generating negative pressure, the treated pure gas can be effectively sucked out from the tar extraction device and collected through the gas collection pipeline. This method ensures the continuous flow of gas and improves the collection efficiency. The polytetrafluoroethylene membrane is set at the bottom of the gas collection pipeline, allowing only gas to pass through and preventing liquid (such as tar) from entering the gas collection system. This ensures that the collected gas is drier and purer. Since the PTFE membrane has good hydrophobicity and resistance to organic solvents, it can effectively prevent liquid substances such as tar from being discharged with the gas, avoiding the contamination of subsequent processing equipment or storage containers by these substances, and also reducing the maintenance workload. The entire device structure is relatively simple and easy to install and maintain. Once installed, only regular inspection and cleaning of the PTFE membrane is required to ensure the normal operation of the system. The negative pressure fan can automatically adjust the wind speed through the control system to adapt to the gas flow requirements under different working conditions and maintain the stable operation of the system. The presence of the PTFE membrane not only prevents liquid leakage, but also reduces the safety hazards caused by the presence of liquid in the gas, such as corrosion, blockage and other problems. The PTFE material has a wide temperature adaptability range and can maintain good performance at different operating temperatures, increasing the reliability and durability of the system.

[0014] Furthermore, an organic solvent distillation device and an oil collecting assembly are also installed on the oil discharge pipeline, and the organic solvent distillation device includes a three-way joint, a heating wire group and a corrosion-resistant hose; the tar outlet end of the tar extraction device is connected to the pipeline through the three-way joint, and the heating wire group is wrapped around the tar outlet end of the tar extraction device, and the heating wire group is wrapped around the pipeline connected to the three-way joint; the oil collecting assembly is composed of a plurality of oil storage bottles, and the oil storage bottle is also connected under the three-way joint.

[0015] By adopting the above technical scheme, an electric heating wire group is wound around the tar outlet end and subsequent pipelines of the tar extraction device. By controlling different heating temperatures, the carbon tetrachloride organic solvent can be gradually evaporated, thereby realizing effective separation of tar and solvent. The three-way joint is used to connect pipelines of different temperature sections, so that tar in different boiling point ranges can be collected into corresponding oil storage bottles, thereby improving the purity of the product. By setting up multi-stage heating wires, different components of the tar can be heated in stages to ensure that each component is evaporated at the most suitable temperature, thereby obtaining a purer tar product. The temperature of each heating area can be independently controlled, making the entire process more flexible and controllable. The heating parameters can be adjusted according to actual needs to achieve the best separation effect. By heating and evaporating carbon tetrachloride and condensing it back to the tar extraction device, the recycling of organic solvents is realized, the operating cost is reduced, and the demand for new solvents is reduced. Tar collected according to different temperature sections can be stored in different oil storage bottles, respectively, which is convenient for subsequent processing or sales, thereby improving the added value of the product.

[0016] Furthermore, the corrosion-resistant hose is also installed with a polytetrafluoroethylene membrane and a negative pressure fan. The polytetrafluoroethylene membrane is arranged inside the corrosion-resistant hose. One end of the corrosion-resistant hose is connected to the three-way joint, and the other end is connected to the negative pressure fan. The outlet end of the negative pressure fan is connected to the lower end of the second U-shaped tube of the tar extraction device through the corrosion-resistant hose.

[0017] By adopting the above technical solution, by generating negative pressure, the evaporated carbon tetrachloride gas can be effectively sucked out from the organic solvent distillation device and redirected back to the tar extraction device. This method ensures the continuous flow of gas and improves the efficiency of the system. The PTFE membrane is arranged inside the corrosion-resistant hose, allowing only gas to pass through and preventing liquid (such as tar droplets that are not completely evaporated) from entering the system. This ensures the purity of the gas during transmission and avoids the influence of liquid substances on subsequent processing equipment. Since the PTFE membrane has good hydrophobicity and resistance to organic solvents, it can effectively prevent liquid from being sucked in with the gas, thereby preventing pollution and blockage problems in the pipeline. The hose made of corrosion-resistant materials can resist the erosion of carbon tetrachloride and other possible chemicals, extending the service life of the pipeline. The presence of the PTFE membrane not only prevents liquid leakage, but also reduces the safety hazards caused by the presence of liquid in the gas, such as corrosion, pipeline damage and other problems. The PTFE material has a wide temperature adaptability range and can maintain good performance at different operating temperatures, increasing the reliability and durability of the system.

[0018] The present invention also includes a method for purifying and separating underground coal gasification products, which utilizes an underground coal gasification product collection device to purify and separate underground coal gasification products, and includes the following steps:

[0019] Step 1: Separating gasification products from coal through a gasifier;

[0020] Step 2: separating the solid from the gasification product by a solid separation device;

[0021] Step 3: extracting tar and pure gas from the gasification product through a tar extraction device and an organic distillation device;

[0022] Step 4: Collect the pure gas through a negative pressure gas collection device;

[0023] Step 5: Separate the tar from the extractant through the electric heating wire group in the oil discharge pipeline;

[0024] Step 6: The oil collecting assembly collects the pure tar, and the extractant flows back to the tar extraction device.

[0025] Furthermore, the coal sample is ignited and burned in the gasifier to produce a gasification reaction, and the outputs include gaseous products, liquid products and solid products. The gaseous products carry part of the solid products into the U-shaped tube one through a pipeline. Under the negative pressure condition of the U-shaped tube one, the gaseous products pass through a filter and enter an external collection device connected to the gas collection pipeline. The gaseous products pass through a high-temperature resistant hose and enter the tar extraction device. Under the action of the condenser, the gasified tar is liquefied under low temperature conditions; the unliquefied tar components in the gaseous products are extracted by carbon tetrachloride organic solvent, and under the dual effects of condensation and carbon tetrachloride extraction, pure hydrogen, methane and carbon monoxide are obtained. The gas passes through the polytetrafluoroethylene membrane and is collected by a negative pressure fan; the tar and carbon tetrachloride mixed solution enters the oil discharge pipeline; through the temperature control panel, the temperature of the electric heating wire is controlled to be 80℃~90℃, so that the carbon tetrachloride in the mixed solution in the branch pipe is evaporated, and the evaporated carbon tetrachloride gas enters the tar extraction device through the corrosion-resistant hose under the action of the negative pressure fan, and the carbon tetrachloride gas is liquefied under the action of the condenser in the tar extraction device, so as to realize the recycling of the carbon tetrachloride organic solvent; under the heating action of the electric heating wire group, the carbon tetrachloride solvent is evaporated to obtain a pure tar sample, and the tar flows into the oil storage bottle, firstly, the temperature of the electric heating wire is adjusted to 100℃~150℃ for preliminary collection of the tar sample; then the temperature of the electric heating wire is adjusted to 200℃~250℃ for further collection of the tar sample; finally, the temperature of the electric heating wire is adjusted to 300℃~350℃ to complete the collection of all tar samples.

[0026] By adopting the above technical scheme, through multi-stage treatment of solid separator, tar extraction device and organic solvent distillation device, gaseous, liquid and solid products can be effectively separated to obtain pure hydrogen, methane and carbon monoxide and other effective gases. By using carbon tetrachloride as an extractant, tar can be efficiently removed from gaseous products to improve the purity of gas. Carbon tetrachloride is evaporated by heating and recondensed and refluxed to the tar extraction device under the action of a negative pressure fan, so that the recycling of carbon tetrachloride is realized, the demand for new solvents is reduced, and the operating cost is reduced. By gradually adjusting the temperature of the heating wire group, tar components within different boiling point ranges can be graded and collected, thereby improving the purity and recovery rate of tar. The efficient separation and recovery process reduces the emission of harmful substances and is beneficial to environmental protection. By optimizing the heating and cooling process, unnecessary energy consumption is reduced and energy utilization efficiency is improved. The entire system adopts a modular design, and each part is relatively independent and easy to disassemble and assemble, which facilitates daily maintenance and overhaul work. The combined use of the temperature control panel and the negative pressure fan can achieve precise control of the heating and suction process, reduce manual intervention, and improve the stability and reliability of the system.

[0027] The present invention has the following beneficial effects:

[0028] 1. The present invention removes solid particles (such as coal ash) in the gas through a solid separator to prevent pipeline blockage or equipment damage. The tar extraction device utilizes the selective dissolution characteristics of carbon tetrachloride organic solvent to effectively separate tar from the gas, thereby obtaining purer gaseous products (such as hydrogen, methane, and carbon monoxide). By heating and distilling the mixture, tar and carbon tetrachloride can be effectively separated, and tar can be collected in stages, thereby improving the purity and recovery rate of tar. The electric heating wire groups of different temperature sections are set so that each tar component can be evaporated and collected at the most suitable temperature, further improving the quality of the product.

[0029] 2. The present invention reduces the emission of harmful substances and avoids environmental pollution through an effective separation and recovery process. It uses carbon tetrachloride as a recyclable solvent and realizes the recycling of carbon tetrachloride through heating evaporation and condensation reflux, thereby reducing operating costs and the demand for new solvents, meeting the requirements of sustainable development, optimizing the heating and cooling process, reducing unnecessary energy consumption, improving energy utilization efficiency, and reducing the energy consumption of the overall process;

[0030] 3. The whole system of the present invention adopts modular design, each part is relatively independent and easy to disassemble and assemble, which is convenient for daily maintenance and overhaul. The heating wire group can be adjusted through the temperature control panel to realize automatic temperature control, simplify the operation process, and reduce the possibility of human error. The negative pressure fan can automatically adjust the wind speed through the control system to adapt to the gas flow requirements under different working conditions and maintain the stable operation of the system. The design of PTFE membrane and corrosion-resistant hose effectively prevents liquid leakage and pipeline blockage, increases the reliability and durability of the system, and the temperature monitoring function can timely alarm or automatically cut off the power supply when the temperature is abnormal, improving the safety of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a flow chart of the method of the present invention;

[0032] Figure 2 It is a schematic diagram of the structure of the device of the present invention.

[0033] Among them, 1-gasification furnace; 2-solid separator; 21-high temperature resistant rubber hose; 22-U-shaped tube one; 23-replaceable filter; 231-flange; 24-electric heating wire group; 25-piston; 3-tar extraction device; 31-oil discharge pipeline; 32-corrosion-resistant hose; 33-U-shaped tube two; 34-organic solvent; 35-spiral condenser; 4-negative pressure gas collection device; 41-polytetrafluoroethylene membrane; 42-negative pressure fan; 43-gas collection pipeline; 5-organic solvent distillation device; 51-three-way connector; 6-oil collection assembly; 61-oil storage bottle; 7-temperature control panel; 71-electric heating wire access port. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific preferred embodiments.

[0035] In the description of the present invention, it should be understood that the terms "left side", "right side", "upper part", "lower part" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. "First", "second" and the like do not indicate the importance of the components, and therefore cannot be understood as limiting the present invention. The specific dimensions used in this embodiment are only for illustrating the technical solution, and do not limit the scope of protection of the present invention.

[0036] like Figure 2As shown, a coal underground gasification product collection device, the gasifier 1 is directly connected to the solid separator 2 through a pipeline, the solid separator includes a U-shaped tube 22, a replaceable filter 23 and a heating wire group 24, wherein the replaceable filter 23 is installed on the U-shaped tube 22 through a flange 231, the heating wire group 24 is spirally wound on the outer wall of the U-shaped tube 22, and is electrically connected to the heating wire access port 71 of the temperature control panel 7; the solid separator 2 is connected to the tar extraction device 3 through a high temperature resistant rubber hose 21, the tar extraction device includes a high temperature resistant rubber hose 21, a U-shaped tube 33, an organic solvent 34 and a spiral condenser 35 The gas outlet end of the U-shaped tube 1 22 is connected to the gas inlet end of the U-shaped tube 2 33 through a high temperature resistant rubber hose 21, and a piston 25 is provided on the gas outlet end of the U-shaped tube 1 22 and the gas inlet end of the U-shaped tube 2 33. The high temperature resistant rubber hose 21 penetrates the piston 25 and probes into the U-shaped tube 1 22 and the U-shaped tube 2 33. The U-shaped tube 2 33 is filled with carbon tetrachloride as an organic solvent 34. The spiral condenser 35 is wound around the outer wall of the U-shaped tube 2 33. A negative pressure gas collection device 4 is provided above the tar extraction device 3. The negative pressure gas collection device includes a polytetrafluoroethylene membrane 41, a negative pressure fan 42 and a gas collection pipeline 43. The negative pressure fan 42 passes through the negative pressure fan 42. The tar extraction device 3 is connected to the gas collection pipeline 43 through a pipeline, and the polytetrafluoroethylene membrane 41 is arranged at the bottom of the gas collection pipeline 43; the tar extraction device 3 is also provided with an oil discharge pipeline 31, and the oil discharge pipeline 31 is connected to the tar extraction device 3 through a corrosion-resistant hose 32. An organic solvent distillation device 5 and an oil collection component 6 are installed on the oil discharge pipeline 31. The organic solvent distillation device 5 includes a three-way joint 51, a heating wire group 24 and a corrosion-resistant hose 32. The tar outlet end of the tar extraction device 3 is connected to the pipeline through the three-way joint 51, and the heating wire group 24 is wound around the tar outlet end of the tar extraction device 3. The heating wire group 24 is also wound around the pipeline connected to the three-way joint 51. The oil assembly 6 is composed of a plurality of oil storage bottles 61, and the oil storage bottles 61 are connected below the three-way joint 51; the polytetrafluoroethylene membrane 41 and the negative pressure fan 42 are installed in the corrosion-resistant hose 32, and the polytetrafluoroethylene membrane 41 is arranged inside the corrosion-resistant hose 32, and one end of the corrosion-resistant hose 32 is connected to the three-way joint 51, and the other end is connected to the negative pressure fan 42, and the outlet end of the negative pressure fan 42 is connected to the lower end of the U-shaped pipe 2 33 of the tar extraction device 3 through the corrosion-resistant hose 32, ensuring that solid particles, tar and various gases are efficiently separated from the products of underground coal gasification, and a pure final product is obtained through different processing steps. Each part is closely connected to form a closed-loop operation process, which improves the efficiency and reliability of the system.

[0037] like Figure 1 As shown, a method for purifying and separating underground coal gasification products, using an underground coal gasification product collection device to purify and separate underground coal gasification products, includes the following steps:

[0038] Step 1: Separating gasification products from coal through a gasifier 1;

[0039] Step 2: separating the solid from the gasification product by a solid separation device;

[0040] Step 3: extracting tar and pure gas from the gasification product through a tar extraction device 3 and an organic distillation device;

[0041] Step 4: Collecting the pure gas through the negative pressure gas collecting device 4;

[0042] Step 5: separating the tar from the extractant through the heating wire group 24 in the oil discharge pipeline 31;

[0043] Step 6: The oil collecting component 6 collects the pure tar, and the extracting agent flows back to the tar extraction device 3.

[0044] First, the coal sample is ignited and burned in the gasifier 1 to generate a gasification reaction, and the output includes gaseous products, liquid products and solid products; then, the gaseous products carry part of the solid products through the pipeline into the U-shaped tube 22, and under the negative pressure condition of the U-shaped tube 22, the gaseous products pass through the replaceable filter 23 into the external collection device connected to the gas collection pipeline 43, and the replaceable filter 23 removes solid particles such as coal ash in the gas to prevent these particles from causing pipeline blockage or equipment damage in the subsequent processing process. The electric heating wire group 24 is spirally wound around the outer wall of the U-shaped tube 22 and is connected to the temperature control surface. The heating wire access port 71 of the plate 7 is electrically connected to maintain a certain temperature, such as 400°C, to prevent the tar components from cooling and adhering to the filter screen; then, the gaseous product after solid separation enters the tar extraction device 3 through the high temperature resistant rubber hose 21, and in the tar extraction device 3, the gasified tar is liquefied under low temperature conditions, such as 25°C, through the action of the spiral condenser 35, and the unliquefied tar components in the gaseous product are extracted by the carbon tetrachloride organic solvent 34. Under the dual action of condensation and carbon tetrachloride extraction, pure hydrogen, methane, carbon monoxide and other effective gases are obtained; next, The pure gas enters the gas collecting pipe 43 through the polytetrafluoroethylene membrane 41, and the negative pressure fan 42 is connected to the gas collecting pipe 43 through a pipe to collect the pure gas. The polytetrafluoroethylene membrane 41 is set at the bottom of the gas collecting pipe 43, allowing only gas to pass through and preventing liquids such as tar from entering the gas collecting system, thereby ensuring that the collected gas is drier and purer; then, the tar and carbon tetrachloride mixed solution enters the oil discharge pipe 31, and the temperature of the electric heating wire group 24 is controlled to 80°C through the temperature control panel 7, so that the carbon tetrachloride in the mixed solution in the branch pipe evaporates, and the evaporated carbon tetrachloride gas is heated by the negative pressure fan 42. Under the use, it enters the tar extraction device 3 through the corrosion-resistant hose 32. Under the action of the condenser in the tar extraction device 3, the carbon tetrachloride gas is liquefied, so that the carbon tetrachloride organic solvent 34 is recycled; finally, under the heating action of the heating wire group 24, the carbon tetrachloride solvent evaporates to obtain a pure tar sample, and the tar flows into the oil storage bottle 61. First, the temperature of the heating wire is adjusted to 100°C to preliminarily collect the tar sample, and then the temperature of the heating wire is adjusted to 200°C to further collect the tar sample, and finally the temperature of the heating wire is adjusted to 300°C to complete the collection of all tar samples.

[0045] Working principle: First, the coal sample undergoes a gasification reaction by ignition and combustion in the gasifier 1, and the outputs include gaseous products such as hydrogen, methane, carbon monoxide, liquid products such as tar and solid products such as coal ash; then, the gaseous products carry part of the solid products through the pipeline into the U-tube 22, and under the negative pressure condition of the U-tube 22, the gaseous products pass through the replaceable filter 23 into the external collection device connected to the gas collection pipeline 43, and the replaceable filter 23 removes solid particles such as coal ash in the gas to prevent these particles from causing pipeline blockage or equipment damage during subsequent processing. The electric heating wire group 24 is spirally wound On the outer wall of the U-shaped tube 22, it is electrically connected to the heating wire access port 71 of the temperature control panel 7 to maintain a certain temperature, for example, 400°C, to prevent the tar components from cooling and adhering to the filter screen; then, the gaseous product after solid separation enters the tar extraction device 3 through the high-temperature resistant rubber hose 21, and in the tar extraction device 3, the gasified tar is liquefied under low temperature conditions, for example, 25°C, through the action of the spiral condenser 35, and the unliquefied tar components in the gaseous product are extracted by the carbon tetrachloride organic solvent 34, and under the dual action of condensation and carbon tetrachloride extraction, pure hydrogen, methane and monoxide are obtained. Next, the pure gas enters the gas collecting pipe 43 through the polytetrafluoroethylene membrane 41, and the negative pressure fan 42 is connected to the gas collecting pipe 43 through a pipe to collect the pure gas. The polytetrafluoroethylene membrane 41 is set at the bottom of the gas collecting pipe 43, allowing only gas to pass through and preventing liquids such as tar from entering the gas collecting system, ensuring that the collected gas is drier and purer; then, the tar and carbon tetrachloride mixed solution enters the oil discharge pipe 31, and the temperature of the electric heating wire group 24 is controlled to 80°C through the temperature control panel 7, so that the carbon tetrachloride in the mixed solution in the branch pipe evaporates, and the evaporated carbon tetrachloride gas is discharged by the negative pressure fan 42. Under the action of the machine 42, the carbon tetrachloride enters the tar extraction device 3 through the corrosion-resistant hose 32. Under the action of the condenser in the tar extraction device 3, the carbon tetrachloride gas is liquefied to realize the recycling of the carbon tetrachloride organic solvent 34; finally, under the heating action of the electric heating wire group 24, the carbon tetrachloride solvent evaporates to obtain a pure tar sample, and the tar flows into the oil storage bottle 61. First, the temperature of the electric heating wire is adjusted to 100°C to preliminarily collect the tar sample, and then the temperature of the electric heating wire is adjusted to 200°C to further collect the tar sample, and finally the temperature of the electric heating wire is adjusted to 300°C to complete the collection of all tar samples. The device efficiently separates solid particles, tar and various gases through the above steps, and obtains a pure final product through different processing steps, ensuring the efficiency and reliability of the system.

[0046] The preferred embodiments of the present invention are described in detail above; however, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A device for collecting underground coal gasification products, characterized in that: The invention comprises a gasifier (1), a solid separator (2), a tar extraction device (3) and a negative pressure gas collection device (4); the gasifier (1) is connected to the solid separator (2) via a pipeline, the solid separator (2) is connected to the tar extraction device (3) via a high temperature resistant rubber hose (21), the negative pressure gas collection device (4) is arranged above the tar extraction device (3), and the tar extraction device (3) is also provided with an oil discharge pipeline (31), and the oil discharge pipeline (31) is connected to the tar extraction device (3) via a corrosion resistant hose (32).

2. The underground coal gasification product collection device according to claim 1, characterized in that: The solid-liquid separator comprises a U-shaped tube (22), a replaceable filter (23) and a heating wire group (24); the replaceable filter (23) is installed on the U-shaped tube (22) through a flange (231), the heating wire group (24) is spirally wound on the outer wall of the U-shaped tube (22), and the heating wire group (24) is electrically connected to the heating wire access port (71) of the temperature control panel (7).

3. The underground coal gasification product collection device according to claim 2, characterized in that: The tar extraction device (3) comprises a high temperature resistant rubber hose (21), a U-shaped tube (33), an organic solvent (34) and a spiral condenser (35); the gas outlet end of the U-shaped tube (22) is connected to the gas inlet end of the U-shaped tube (33) through the high temperature resistant rubber hose (21), the gas outlet end of the U-shaped tube (22) and the gas inlet end of the U-shaped tube (33) are both provided with pistons (25), the high temperature resistant rubber hose (21) penetrates the piston (25) and penetrates into the U-shaped tube (22) and the U-shaped tube (33); the U-shaped tube (33) contains an organic solvent (34), and the organic solvent (34) is carbon tetrachloride, and the spiral condenser (35) is wound around the outer wall of the U-shaped tube (33).

4. The underground coal gasification product collection device according to claim 1, characterized in that: The negative pressure gas collection device (4) comprises a polytetrafluoroethylene membrane (41), a negative pressure fan (42) and a gas collection pipeline (43); the negative pressure fan (42) is connected to the gas collection pipeline (43) through a pipeline, and the polytetrafluoroethylene membrane (41) is arranged at the bottom of the gas collection pipeline (43).

5. The underground coal gasification product collection device according to claim 1, characterized in that: An organic solvent distillation device (5) and an oil collecting assembly (6) are also installed on the oil discharge pipeline (31), wherein the organic solvent distillation device (5) comprises a three-way joint (51), a heating wire group (24) and a corrosion-resistant hose (32); the tar outlet end of the tar extraction device (3) is connected to the pipeline via the three-way joint (51), the heating wire group (24) is wound around the tar outlet end of the tar extraction device (3), and the heating wire group (24) is wound around the pipeline connected to the three-way joint (51); the oil collecting assembly (6) is composed of a plurality of oil storage bottles (61), and the oil storage bottle (61) is also connected below the three-way joint (51).

6. The underground coal gasification product collection device according to claim 5, characterized in that: The corrosion-resistant hose (32) is also installed with a polytetrafluoroethylene membrane (41) and a negative pressure fan (42), wherein the polytetrafluoroethylene membrane (41) is arranged inside the corrosion-resistant hose (32), one end of the corrosion-resistant hose (32) is connected to the three-way joint (51), and the other end is connected to the negative pressure fan (42), and the outlet end of the negative pressure fan (42) is connected to the lower end of the U-shaped tube 2 (33) of the tar extraction device (3) through the corrosion-resistant hose (32).

7. A method for purifying and separating underground coal gasification products, characterized in that: Purification and separation of underground coal gasification products is achieved by using the underground coal gasification product collection device according to any one of claims 1 to 6, comprising the following steps: Step 1: Separating gasification products from coal through a gasifier (1); Step 2: separating the solid from the gasification product by a solid separation device; Step 3: extracting tar and pure gas from the gasification product through a tar extraction device (3) and an organic distillation device; Step 4: Collecting the pure gas through the negative pressure gas collecting device (4); Step 5: separating the tar from the extractant through the electric heating wire group (24) in the oil discharge pipeline (31); Step 6: The oil collecting assembly (6) collects the pure tar, and the extractant flows back to the tar extraction device (3).

8. The underground coal gasification product collection device and purification and separation method according to claim 7, characterized in that: The coal sample is ignited and burned in the gasification furnace (1) to generate a gasification reaction, and the output includes gaseous products, liquid products and solid products. The gaseous products carry part of the solid products and enter the U-shaped tube (22) through a pipeline. Under the negative pressure condition of the U-shaped tube (22), the gaseous products pass through a filter and enter an external collection device connected to the gas collection pipeline (43). The gaseous products pass through a high-temperature resistant hose and enter the tar extraction device (3). Under the action of the condenser, the gasified tar is liquefied under low temperature conditions. The unliquefied tar components in the gaseous products are extracted by a carbon tetrachloride organic solvent (34). Under the dual action of condensation and carbon tetrachloride extraction, pure hydrogen, methane and carbon monoxide are obtained. The gas passes through the polytetrafluoroethylene membrane (41) and is collected by a negative pressure fan (42). The tar and carbon tetrachloride mixed solution enters the oil discharge pipeline (3 1); through the temperature control panel (7), the temperature of the electric heating wire is controlled to be 80°C to 90°C, so that the carbon tetrachloride in the mixed solution in the branch pipe evaporates, and the evaporated carbon tetrachloride gas enters the tar extraction device (3) through the corrosion-resistant hose (32) under the action of the negative pressure fan (42), and the carbon tetrachloride gas is liquefied under the action of the condenser in the tar extraction device (3), so that the carbon tetrachloride organic solvent (34) is recycled; under the heating action of the electric heating wire group (24), the carbon tetrachloride solvent evaporates to obtain a pure tar sample, and the tar flows into the oil storage bottle (61), firstly, the temperature of the electric heating wire is adjusted to 100°C to 150°C to preliminarily collect the tar sample; then the temperature of the electric heating wire is adjusted to 200°C to 250°C to further collect the tar sample; finally, the temperature of the electric heating wire is adjusted to 300°C to 350°C to complete the collection of all the tar samples.

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