High-temperature cracking system and control method for preparing synthesis gas through high-temperature cracking

Abstract

The invention provides a high-temperature cracking system which comprises a combustion furnace, a front-end gas conveying pipeline, an oxygen conveying pipeline and a water vapor conveying pipeline and further comprises a control mechanism, and the control mechanism comprises a controller, a front-end gas pipeline control valve, an oxygen pipeline control valve, a water vapor pipeline control valve and a temperature detection device. The front-end gas pipeline control valve is installed on the front-end gas conveying pipeline, the oxygen pipeline control valve is installed on the oxygen conveying pipeline, the water vapor pipeline control valve is installed on the water vapor conveying pipeline, and the temperature detection device is installed on the combustion furnace. The front end gas pipeline control valve, the oxygen pipeline control valve, the water vapor pipeline control valve and the temperature detection device are all electrically connected with the controller. The invention further provides a control method for preparing the synthesis gas through high-temperature cracking. By arranging the control mechanism comprising the front-end gas pipeline control valve, the oxygen pipeline control valve, the water vapor pipeline control valve, the temperature detection device and the controller, automatic control over the high-temperature cracking system is facilitated.

Description

Technical Field

[0001] The present application belongs to the field of high temperature cracking, and specifically, relates to a high temperature cracking system and a control method for preparing synthesis gas by high temperature cracking. Background Art

[0002] After oil and gas, methanol is known as the "most ideal" renewable clean fuel. In addition, methanol is also a carrier of hydrogen energy, which can realize the conversion of hydrogen-methanol-hydrogen, and also provides a new solution to the storage and transportation problems that have been plaguing the hydrogen energy industry.

[0003] Biomass to methanol is one of the ways to produce green methanol. In the process of biomass to methanol, the pyrolysis gas needs to be cracked and reformed at high temperature to obtain synthesis gas rich in hydrogen (H2) and carbon monoxide (CO). High temperature cracking is usually carried out in a high temperature cracking furnace, which uses high temperature to decompose substances under high temperature environment. It is necessary to use an automated control system to improve the safety and reliability of the reforming production of the raw gas after biomass pyrolysis. Summary of the invention

[0004] This application aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the main technical solutions adopted in this application include:

[0005] In a first aspect, the present application provides a high-temperature cracking system, comprising a combustion furnace, a front-end gas delivery pipeline, an oxygen delivery pipeline and a water vapor delivery pipeline, wherein the front-end gas delivery pipeline connects the combustion furnace and the front-end gas source, the oxygen delivery pipeline connects the combustion furnace and the oxygen source, and the water vapor delivery pipeline connects the combustion furnace and the water vapor source. The high-temperature cracking system also includes a control mechanism, which includes a controller, a front-end gas pipeline control valve, an oxygen pipeline control valve, a water vapor pipeline control valve and a temperature detection device, wherein the front-end gas pipeline control valve is installed on the front-end gas delivery pipeline, the oxygen pipeline control valve is installed on the oxygen delivery pipeline, the water vapor pipeline control valve is installed on the water vapor delivery pipeline, and the temperature detection device is installed on the combustion furnace; the front-end gas pipeline control valve, the oxygen pipeline control valve, the water vapor pipeline control valve and the temperature detection device are all electrically connected to the controller.

[0006] The high-temperature cracking system provided in the present application helps to realize automatic control of the high-temperature cracking system by correspondingly arranging a front-end gas pipeline control valve, an oxygen pipeline control valve, and a water vapor pipeline control valve on the front-end gas delivery pipeline, oxygen delivery pipeline, and water vapor delivery pipeline connected to the combustion furnace, and configuring a temperature detection device on the combustion furnace, and the front-end gas pipeline control valve, oxygen pipeline control valve, water vapor pipeline control valve and temperature detection device are all electrically connected to the controller.

[0007] In a second aspect, the present application provides a control method for preparing synthesis gas by high temperature cracking, comprising:

[0008] The front-end gas enters the combustion furnace through the front-end gas delivery pipeline. The temperature detection device senses the temperature in the furnace and feeds back a signal to the controller. When the controller detects that the temperature in the furnace reaches the preset temperature, the controller outputs an execution signal to the oxygen pipeline control valve. The oxygen pipeline control valve opens and inputs oxygen into the combustion furnace to mix with the front-end gas for combustion.

[0009] When the controller detects that the temperature in the furnace has reached the preset reaction temperature, it outputs an execution signal to the steam pipeline control valve on the steam delivery pipeline. The steam pipeline control valve opens, and steam is input into the combustion furnace to undergo a hydrolysis reaction with the front-end gas to generate synthesis gas.

[0010] The control method for preparing synthesis gas by high-temperature cracking provided in the present application detects the temperature in the combustion furnace through a temperature detection device and feeds back a signal to a controller, and the controller sends a corresponding execution signal to the oxygen pipeline control valve and the water vapor pipeline control valve to perform corresponding actions, thereby realizing automatic control of preparing synthesis gas by high-temperature cracking. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0012] Figure 1 A schematic diagram of a high temperature cracking system provided in an embodiment of the present application;

[0013] Figure 2 A partial schematic diagram of a high-temperature cracking furnace provided in an embodiment of the present application;

[0014] Figure 3 Another partial schematic diagram of a high-temperature cracking furnace provided in an embodiment of the present application;

[0015] Figure 4 A schematic diagram of the structure of the cover provided in an embodiment of the present application. DETAILED DESCRIPTION

[0016] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0017] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0018] After oil and gas, methanol is hailed as the "most ideal" renewable clean fuel. Methanol has gradually been regarded as liquid "hydrogen" and mobile "electricity" in the industry. Green methanol belongs to green hydrogen-based energy, an important part of the new energy system, and has huge market potential. Hydrogen is a major raw material for the preparation of methanol. Accordingly, the production of green methanol requires a large amount of green hydrogen. Green alcohol provides a huge new scenario and way out for hydrogen energy consumption, which can drive the demand for the entire green hydrogen industry. In addition, methanol is also a carrier of hydrogen energy, which can realize the conversion of hydrogen-methanol-hydrogen, which also provides a new solution to the storage and transportation problems that have been plaguing the hydrogen energy industry.

[0019] Green methanol is chemically identical to methanol produced from fossil fuels and has similar uses. However, unlike "black methanol" or "grey methanol" made from coal, green methanol not only reduces carbon emissions from the coal-to-methanol process, but also improves the local consumption capacity of renewable energy. It will be an important technical path to achieve carbon peak and carbon neutrality, and has great application prospects. The EU's standards are relatively strict: Different from traditional coal-based and natural gas-based methanol, methanol produced from the following two types of raw materials is identified as "green methanol": biomass-based methanol, green hydrogen, and renewable carbon dioxide-based methanol.

[0020] The process of producing methanol from biomass can be roughly divided into the collection, gasification and synthesis of biomass such as straw. Biomass gasification is a technology for thermochemical conversion of biomass. The biomass raw materials are heated to crack the large molecular organic hydrocarbon chains into smaller molecular combustible gases such as carbon monoxide (CO), hydrogen (H2), and methane (CH4).

[0021] To synthesize methanol from biomass, the biomass must first be converted into a raw gas rich in H2 and CO. The raw gas contains inert gases, tar, solid particles and hydrocarbons, so it cannot be directly converted into methanol. It needs to go through intermediate links to form a biomass gasification methanol synthesis system, which mainly includes biomass pretreatment, pyrolysis and gasification, gas reforming, methanol synthesis, etc. Gas reforming is the reforming of the raw gas generated after pyrolysis and gasification to produce hydrogen. For example, methane and tar are cracked and reformed into hydrogen (H2) and carbon monoxide (CO) in a high-temperature cracking furnace at high temperatures, such as 1000℃ to 1300℃. The high-temperature cracking furnace reacts at high temperature and high pressure, and there is a risk of explosion.

[0022] To do this, see Figures 1 to 3The present embodiment provides a high temperature cracking furnace, comprising a combustion furnace 10, a pressure relief pipeline 20 and a bursting disc safety device 30, wherein the pressure relief pipeline 20 is connected to the combustion furnace 10, and the bursting disc safety device 30 is installed on the pressure relief pipeline 20. The high temperature cracking furnace further comprises a cooling device 40, wherein the cooling device 40 has a cooling chamber 400, and the bursting disc safety device 30 comprises a bursting disc 30a, wherein at least the bursting disc 30a of the bursting disc safety device 30 is located in the cooling chamber 400, wherein the bursting disc 30a is located in the pressure relief pipeline 20. In the present embodiment, by providing the bursting disc safety device 30, once the pressure in the combustion furnace 10 exceeds the bursting pressure of the bursting disc 30a, the bursting disc will rupture, and the gas in the combustion furnace 10 will be released from the pressure relief pipeline 20. The material used to make the bursting disc has limited temperature resistance. Usually, the normal operating temperature range of the bursting disc is -250°C to 500°C, while the temperature in the high-temperature cracking furnace is as high as thousands of degrees. Therefore, in this embodiment, a cooling device 40 is configured for the bursting disc safety device 30 to reduce the temperature through the cooling device 40 so that the bursting disc 30a can work normally.

[0023] Please refer again Figure 2 and Figure 3 The cooling device 40 includes a box 40a, the cooling chamber 400 is located in the box 40a, the box 40a has a first interface 40a1 and a second interface 40a2, the first interface 40a1 and the second interface 40a2 are connected to the cooling medium delivery system; the first interface 40a1 is used for the cooling medium to flow into the cooling chamber 400, and the second interface 40a2 is used for the cooling medium to flow out of the cooling chamber 400; wherein, the design height of the liquid level line of the cooling medium in the box 40a is higher than the setting height of the bursting disc 30a. In other words, when the high-temperature cracking furnace is in operation, the bursting disc 30a is immersed in the cooling medium, and the bursting disc 30a is cooled by heat exchange with the cooling medium, and the bursting disc 30a is timely exchanged with the bursting disc 30a, and the heat is taken away in time by the flow of the cooling medium, so that the bursting disc 30a is maintained in the normal working temperature range.

[0024] Among them, the cooling medium and the bursting piece 30a can be directly or indirectly exchanged. In order to improve the heat exchange effect, the present application provides an opening 200 in the part of the pressure relief pipeline 20 located in the cooling chamber 400, and the minimum distance from the opening 200 to the inner bottom surface 40a3 of the box body 40a is greater than the maximum distance from the bursting piece 30a to the inner bottom surface 40a3; and in the gravity direction, the lower edge of the opening 200 is located between the bursting piece 30a and the liquid level line, and the opening 200 radially penetrates the pressure relief pipeline 20. In other words, the opening 200 is arranged above the bursting disc 30a, and the cooling medium can enter from the opening 200 into the partial space in the pressure relief pipeline 20 above the bursting disc 30a, flow through the upper surface of the bursting disc 30a in the pressure relief pipeline 20, and flow out from the opening 200 on the opposite side, that is, the bursting disc 30a is above the flowing cooling medium, and the below is the gas in the combustion furnace 10. When the cooling medium flows through the bursting disc 30a, it will take away the heat of the bursting disc 30a, so that the bursting disc 30a can keep working within the normal working temperature, reducing or even avoiding the problem that the high-temperature gas in the cracking process affects the bursting disc 30a and causes its working failure.

[0025] See also Figure 2 In some embodiments, the first interface 40a1 and the second interface 40a2 are arranged opposite to each other. In the direction of gravity, the first interface 40a1 and the second interface 40a2 are both arranged above the bursting disc 30a. The cooling medium flows into the box body 40a from the first interface 40a1, and flows into the top of the bursting disc 30a from the opening 200, reducing the travel from the cooling medium inlet to the bursting disc 30a, reducing heat exchange, so that the cooling medium can exchange heat with the bursting disc 30a at a lower temperature, thereby improving the heat exchange effect. Furthermore, the first interface 40a1 is arranged opposite to the opening 200, and a part of the cooling medium flowing in from the first interface 40a1 can enter the pressure relief pipeline 20 from the opening 200, flow through the bursting disc 30a, and then flow out from the opening 200 on the opposite side, and flow out of the box body 40a from the second interface 40a2, thereby improving the cooling effect of the bursting disc 30a by convection.

[0026] See also Figure 3In some embodiments, the first interface 40a1 and the second interface 40a2 are arranged diagonally. In the direction of gravity, the first interface 40a1 is arranged below the bursting disc 30a, and the second interface 40a2 is arranged above the bursting disc 30a. The first interface 40a1 is arranged close to the inner bottom surface 40a3 of the box body 40a. The inner bottom surface 40a3 is arranged close to the combustion furnace 10. In this embodiment, after the cooling medium flows into the box body 40a through the first interface 40a1, it can exchange heat with the pressure relief pipeline 20 located below the bursting disc 30a, and cool the gas inside it to reduce the thermal impact on the bursting disc 30a. The cooling medium can also enter the pressure relief pipeline 20 from the opening 200 and flow through the upper surface of the bursting disc 30a to cool the bursting disc 30a.

[0027] Please refer again Figure 2 and Figure 3 The bursting disc safety device 30 includes a holder 30b, which is used to install and fix the bursting disc 30a. The holder 30b includes a first clamping portion 30b1 and a second holding portion 30b2. The first clamping portion 30b1 and the second holding portion 30b2 are annular. The first clamping portion 30b1 and the second holding portion 30b2 are respectively located on both sides of the bursting disc 30a and clamp and fix the edge of the bursting disc 30a. The first clamping portion 30b1 and the second holding portion 30b2 are flange-connected. Specifically, the high-temperature cracking furnace includes a connecting pipe 50 and a discharge pipe 60. The connecting pipe 50 connects the combustion furnace 10 and the holder 30b; the discharge pipe 60 connects the holder 30b and extends to the outside of the box 40a. The opening 200 is located in the discharge pipe 60; the pressure relief pipeline 20 includes a passage of the connecting pipe 50 and a passage of the discharge pipe 60.

[0028] The connecting pipe 50 and the box body 40a are welded into an integral part, which reduces the leakage points at the connection between the connecting pipe 50 and the box body 40a and improves the sealing performance. In addition, both ends of the connecting pipe 50 are provided with threads, and the connecting pipe 50 is threadedly connected with the clamp 30b and the combustion furnace 10, which is convenient for disassembly. Of course, welding can also be performed on the annular gap after the threaded connection to improve the sealing performance and avoid gas leakage.

[0029] In this embodiment, the combustion furnace 10 includes a furnace body 10a and a furnace cover 10b, and the furnace cover 10b is connected and fixed to the furnace body 10a. The connection method is not specifically limited, and can be fastener flange connection, bonding, clamping, or welding. Among them, the furnace cover 10b is provided with a pressure relief hole 10b1, and the pressure relief hole 10b1 is connected to the pipeline of the connecting pipe 50. Specifically, the connecting pipe 50 connects the furnace cover 10b and the first clamping part 30b1, and the passage of the connecting pipe 50 is connected to the pressure relief hole 10b1 and the passage in the first clamping part 30b1. The discharge pipe 60 is connected to the second supporting part 30b2 and is connected to the passage in the second supporting part 30b2. The discharge pipe 60 and the second supporting part 30b2 can be separate parts connected together, or the two can be integrated.

[0030] Please refer again Figure 2 and Figure 3 , and combined with Figure 4 In this embodiment, the cooling device 40 further includes a cover 40b, which is flange-connected to the box body 40a. The cover 40b is a split flange cover, and the discharge pipe 60 passes through the cover 40b. In this embodiment, the cover 40b is a split flange cover (such as a flap flange cover), and a through hole 40b1 is provided in the center for the discharge pipe 60 to pass through, so as to facilitate replacement of the bursting disc 30a inside the box body 40a after disassembly.

[0031] In addition, in this embodiment, the temperature reduction device 40 further includes a cushion block 40 c , which is disposed at the bottom of the box body 40 a and abuts against the combustion furnace 10 .

[0032] Please refer again Figures 1 to 3 In this embodiment, the high temperature cracking furnace is further provided with a cooling medium input pipeline 70 and a cooling medium output pipeline 80, both of which are connected to the housing 40a, and the cooling medium input pipeline 70 is provided with an on-off valve 70a. In this embodiment, the cooling medium input pipeline 70 is connected to the first interface 40a1, and the cooling medium input pipeline 70 is used to supply the cooling medium to flow into the housing 40a, and the cooling medium output pipeline 80 is connected to the second interface 40a2, and the cooling medium output pipeline 80 is used for the cooling medium to flow out of the housing 40a. During operation, the cooling medium enters the housing 40a through the cooling medium input pipeline 70 to perform heat exchange and cooling on the bursting disc 30a, and then flows out of the housing 40a through the cooling medium output pipeline 80.

[0033] The present embodiment also provides a high temperature cracking system, comprising a combustion furnace 10, a pressure relief pipeline 20 and a bursting disc safety device 30, wherein the pressure relief pipeline 20 is connected to the combustion furnace 10, the bursting disc safety device 30 is installed on the pressure relief pipeline 20, the high temperature cracking furnace further comprises a cooling device 40, the cooling device 40 comprises a box 40a, the box 40a has a cooling chamber 400, the bursting disc safety device 30 comprises a bursting disc 30a, at least the bursting disc 30a in the bursting disc safety device 30 is located in the cooling chamber 400, the high temperature cracking system further comprises a cooling medium input pipeline 70 and a cooling medium output pipeline 80, the cooling medium input pipeline 70 and the cooling medium output pipeline 80 are both connected to the box 40a. Wherein, the cooling medium input pipeline 70 is provided with an on-off valve 70a, and the high temperature cracking system further comprises a controller 41, and the controller 41 is electrically connected to the on-off valve 70a. In this embodiment, an on-off valve 70a is provided in the cooling medium input pipeline 70, and the on-off valve 70a is electrically connected to the controller 41. During the operation of the high-temperature cracking system, the cooling device 40 cools the bursting disc 30a. Once the bursting disc 30a explodes, the pressure pushes the water on the upper surface of the bursting disc directly into the pressure relief pipeline 20, and the controller 41 controls the on-off valve 70a to close, so as to prevent water from flowing into the combustion furnace 10.

[0034] In this embodiment, the on-off valve 70a is an electric ball valve, which is electrically connected to the controller 41. The controller 41 can send an execution signal to the on-off valve 70a to perform a switch operation.

[0035] Furthermore, in this embodiment, the high temperature cracking system further includes a pressure detection device 49, which is installed in the combustion furnace 10, and is used to detect the pressure in the combustion furnace 10, and the pressure detection device 49 is electrically connected to the controller 41. In this embodiment, the pressure detection device 49 senses the pressure signal in the combustion furnace 10 in real time, and converts the pressure signal into an electrical signal and transmits it to the controller 41, and the controller 41 receives the electrical signal and processes it to obtain a pressure value.

[0036] Furthermore, in this embodiment, the high-temperature cracking system further includes a front-end gas delivery pipeline 1, an oxygen delivery pipeline 2 and a water vapor delivery pipeline 3, and a front-end gas pipeline control valve 42 provided on the front-end gas delivery pipeline 1, an oxygen pipeline control valve 43 provided on the oxygen delivery pipeline 2 and a water vapor pipeline control valve 44 provided on the water vapor delivery pipeline 3, wherein the front-end gas pipeline control valve 42, the oxygen pipeline control valve 43 and the water vapor pipeline control valve 44 are all electrically connected to the controller 41. Among them, the front-end gas delivery pipeline 1 connects the combustion furnace 10 and the front-end gas source A, the oxygen delivery pipeline 2 connects the combustion furnace 10 and the oxygen source C, and the water vapor delivery pipeline 3 connects the combustion furnace 10 and the water vapor source B. In this embodiment, the front-end gas pipeline control valve 42 is installed on the front-end gas delivery pipeline 1, the oxygen pipeline control valve 43 is installed on the oxygen delivery pipeline 2, and the water vapor pipeline control valve 44 is installed on the water vapor delivery pipeline 3. By setting a control mechanism 4 including a controller 41, the front-end gas pipeline control valve 42, the oxygen pipeline control valve 43 and the water vapor pipeline control valve 44, the front-end gas pipeline control valve 42, the oxygen pipeline control valve 43 and the water vapor pipeline control valve 44 are switched on and off.

[0037] The front-end gas pipeline control valve 42 includes a front-end gas pipeline cut-off valve 42b, which is arranged near the combustion furnace 10 along the front-end gas delivery pipeline 1; the oxygen pipeline control valve 43 includes a first cut-off valve 43b, which is arranged near the combustion furnace 10 along the oxygen delivery pipeline 2; and the water vapor pipeline control valve 44 includes a second cut-off valve 44b, which is arranged near the combustion furnace 10 along the water vapor delivery pipeline 3. During the operation of the high-temperature cracking system, the pressure detection device 49 senses the pressure in the combustion furnace 10 and transmits it to the controller 41 in real time. The controller 41 monitors the pressure. Once the combustion furnace 10 senses that the pressure and / or pressure drop in the combustion furnace reaches the set threshold, an execution signal is sent to the front-end gas pipeline cut-off valve 42b, the first cut-off valve 43b and the second cut-off valve 44b to perform a shut-off operation, thereby timely blocking the front-end gas, oxygen and water vapor from being input into the combustion furnace 10.

[0038] In addition, the present embodiment also provides a safety control method for preparing synthesis gas by high-temperature cracking, comprising: when the combustion furnace 10 is in working state, the cooling device 40 is started to cool the bursting disc 30a, so that the bursting disc 30a is maintained in the normal working temperature range; when the pressure in the combustion furnace 10 is greater than the bursting pressure of the bursting disc 30a of the bursting disc safety device 30, the bursting disc 30a explodes, and the gas in the combustion furnace 10 is discharged and depressurized through the pressure relief pipeline 20. The bursting disc 30a in the operation of the high-temperature cracking system is cooled by the cooling device 40, so that the bursting disc 30a can work normally, and the normal operation of the bursting disc 30a is avoided to be affected by the high temperature of the combustion furnace 10. In addition, once the pressure in the combustion furnace 10 causes the bursting disc 30a to explode, the pressure relief pipeline 20 is opened, and the gas in the combustion furnace 10 is discharged and depressurized through the pressure relief pipeline 20.

[0039] In some embodiments, the safety control method for preparing synthesis gas by high-temperature cracking further includes: the pressure detection device 49 detects the pressure in the combustion furnace 10, when the bursting disc 30a explodes, the controller 41 monitors that the pressure drop reaches the set pressure drop threshold, the controller 41 outputs an execution signal to the on-off valve 70a, closes the cooling medium input pipeline 70, and prevents water from flowing into the combustion furnace 10; at the same time, the controller 41 outputs an execution signal to the front-end gas pipeline control valve 42, the oxygen pipeline control valve 43 and the water vapor pipeline control valve 44 to perform a shut-off action, blocking the front-end gas, oxygen and water vapor from being input into the combustion furnace 10. Specifically, the controller 41 outputs an execution signal to the front-end gas pipeline cut-off valve 42b, the first cut-off valve 43b and the second cut-off valve 44b to perform a shut-off action. Among them, the set pressure drop threshold range is 0.03Mpa to 0.08Mpa, for example, it can be set to 0.03Mpa, 0.05Mpa, 0.065Mpa, 0.08Mpa, etc.

[0040] In other embodiments, the safety control method for preparing synthesis gas by high-temperature cracking also includes: the pressure detection device 49 detects the pressure in the combustion furnace 10 and feeds back to the controller 41. When the controller 41 monitors that the pressure in the combustion furnace 10 exceeds the set pressure threshold, the controller 41 outputs an execution signal to the front-end gas pipeline control valve 42, the oxygen pipeline control valve 43 and the water vapor pipeline control valve 44 to perform a shut-off action to protect the combustion furnace 10. Specifically, the controller 41 outputs an execution signal to the front-end gas pipeline shut-off valve 42b, the first shut-off valve 43b and the second shut-off valve 44b to perform a shut-off action. Among them, the range of setting the pressure threshold is 0.13Mpa to 0.18Mpa, for example, it can be set to 0.13Mpa, 0.15Mpa, 0.16Mpa, 0.17Mpa, 0.18Mpa, etc.

[0041] Of course, when the controller 41 monitors that at least one of the pressure and the pressure drop reaches the set threshold, the controller 41 outputs an execution signal to the on-off valve 70a to close the cooling medium input pipeline 70 to prevent water from flowing into the combustion furnace 10; at the same time, the controller 41 outputs an execution signal to the front-end gas pipeline shut-off valve 42b, the first shut-off valve 43b and the second shut-off valve 44b to perform a shut-off action.

[0042] In the above embodiments, the cooling medium may be water, antifreeze liquid, etc.

[0043] Please refer again Figure 1 In the high temperature cracking system of this embodiment, the control mechanism 4 further includes a temperature detection device 45 , which is installed in the combustion furnace 10 . The temperature detection device 45 is also electrically connected to the controller 41 . In this embodiment, the front-end gas pipeline control valve 42, the oxygen pipeline control valve 43, the water vapor pipeline control valve 44 and the temperature detection device 45 are all electrically connected to the controller 41. During the operation of the high-temperature cracking system, the temperature signal can be fed back to the controller 41 through the temperature detection device 45, and the controller 41 processes it and gives an execution signal to the front-end gas pipeline control valve 42, the oxygen pipeline control valve 43 and the water vapor pipeline control valve 44 to perform corresponding switching operations. In other words, the controller 41 is used to regulate the front-end gas pipeline control valve 42, the oxygen pipeline control valve 43 and the water vapor pipeline control valve 44, so that the front-end gas of the high-temperature cracking system enters the combustion furnace 10 under the reaction condition to undergo a cracking reaction to generate synthesis gas, complete the cracking reaction of the front-end gas in the combustion furnace 10, and realize the intelligent production of synthesis gas generated by high-temperature cracking, wherein the temperature of the cracking reaction is ≥1000°C.

[0044] In this embodiment, the front-end gas source A can be a gas storage tank storing mixed gas (including carbon monoxide CO, hydrogen H2, methane CH4, tar, etc.), or raw gas generated after being processed in the previous stage (such as a pyrolysis gasification device). The water vapor source B can be a steam generator or a steam engine.

[0045] In the above embodiment, along the front-end gas delivery pipeline 1, the front-end gas pipeline cut-off valve 42b is arranged close to the combustion furnace 10. The oxygen pipeline control valve 43 further includes a first regulating valve 43a. Compared with the first regulating valve 43a, the first cut-off valve 43b is arranged closer to the combustion furnace 10. In other words, along the oxygen delivery pipeline 2, the first cut-off valve 43b is arranged close to the combustion furnace 10. In addition, the water vapor pipeline control valve 44 further includes a second regulating valve 44a. Compared with the second regulating valve 44a, the second cut-off valve 44b is arranged closer to the combustion furnace 10. In other words, along the water vapor delivery pipeline 3, the second cut-off valve 44b is arranged close to the combustion furnace 10. In this embodiment, the front-end gas pipeline cut-off valve 42b, the first cut-off valve 43b and the second cut-off valve 44b all adopt quick switching valves. By arranging the front-end gas pipeline cut-off valve 42b, the first cut-off valve 43b and the second cut-off valve 44b close to the combustion furnace 10, the quick cutting operation can be better realized to control the flow and cut-off operation of the gas in each pipeline.

[0046] In this embodiment, the control mechanism 4 also includes a first flow meter 46, a second flow meter 47 and a third flow meter 48. The first flow meter 46 is installed on the front-end gas delivery pipeline 1, and the first flow meter 46 is configured to be connected to the input end of the front-end gas pipeline cut-off valve 42b; the second flow meter 47 is installed on the oxygen delivery pipeline 2, and the second flow meter 47 is configured to be close to the output end of the first regulating valve 43a; the third flow meter 48 is installed on the water vapor delivery pipeline 3, and the third flow meter 48 is configured to be close to the output end of the first regulating valve 44a; wherein the first flow meter 46, the second flow meter 47 and the third flow meter 48 are all electrically connected to the controller 41. In this embodiment, the first flowmeter 46 is used to measure the intake flow rate of the front-end gas in the front-end gas delivery pipeline 1; the first regulating valve 43a is used to adjust the intake amount of oxygen in the oxygen delivery pipeline 2, and the second flowmeter 47 is used to measure the intake flow rate of oxygen after being adjusted by the first regulating valve 43a; the second regulating valve 44a is used to adjust the intake amount of water vapor in the water vapor delivery pipeline 3, and the third flowmeter 48 is used to measure the intake flow rate of water vapor after being adjusted by the second regulating valve 44a. During operation, the first flowmeter 46, the second flowmeter 47 and the third flowmeter 48 send feedback signals to the controller 41, and the controller 41 sends execution signals to the first regulating valve 43a and the second regulating valve 44a. In this embodiment, if the front-end gas source A is provided with a regulating valve, the first flowmeter 46 is provided between the front-end gas pipeline cut-off valve 42b and the front-end gas source A; if the front-end gas source A is not provided with a regulating valve, a regulating valve is added to the front-end gas delivery pipeline 1, and the first flowmeter 46 is provided between the regulating valve and the front-end gas pipeline cut-off valve 42b.

[0047] Please refer again Figure 1 The high-temperature cracking system also includes a heater 5, and the heater 5 has a partial section of at least one of the water vapor delivery pipeline 3 and the oxygen delivery pipeline 2. In some embodiments, the heater 5 has a partial section of the water vapor delivery pipeline 3, which is used to heat the water vapor before entering the combustion furnace 10. In other embodiments, the heater 5 has a partial section of the oxygen delivery pipeline 2, which is used to heat the oxygen before entering the combustion furnace 10. In some other embodiments, the heater 5 has both a partial section of the water vapor delivery pipeline 3 and a partial section of the oxygen delivery pipeline 2. In other words, the water vapor and oxygen are both heated by the heater 5 before entering the combustion furnace 10. By sharing the heater 5, it is beneficial to reduce the parts of the system and reduce the cost. At the same time, it is also simpler for the wiring of the pipeline. In this embodiment, the heater 5 is an electric heater.

[0048] Specifically, in this embodiment, the heater 5 includes a first heating pipeline 51, the oxygen delivery pipeline 2 includes the first heating pipeline 51, and the first heating pipeline 51 is located between the first regulating valve 43a and the first shut-off valve 43b; the heater 5 also includes a second heating pipeline 52, the water vapor delivery pipeline 3 includes the second heating pipeline 52, and the second heating pipeline 52 is located between the second regulating valve 44a and the second shut-off valve 44b. By setting the heater 5, the water vapor and oxygen are heated before entering the combustion furnace 10, and will not excessively absorb the temperature in the furnace, and can react more, so that the temperature in the furnace rises to thousands of degrees faster, or even reaches 1300 degrees.

[0049] In this embodiment, the high temperature cracking system further includes an output pipeline 6 and a three-way valve 7, wherein the output pipeline 6 is connected to the combustion furnace 10 and the inlet end of the three-way valve 7, and the two outlet ends of the three-way valve 7 are respectively connected to the next section D and the discharge pipeline E; the output pipeline 6 is provided with a gas detection device 8, and the gas detection device 8 and the three-way valve 7 are both electrically connected to the controller 41. In this embodiment, by providing the three-way valve 7 and the gas detection device 8, and the gas detection device 8 and the three-way valve 7 are both electrically connected to the controller 41, the gas detection device 8 is used to detect the methane content of the gas output through the output pipeline 6, and send a feedback signal to the controller 41. When the controller 41 monitors that the methane content meets the standard, it sends an execution signal to the three-way valve 7, and the three-way valve 7 shuts off the output pipeline 6 and the discharge pipeline E, and opens the output pipeline 6 and the next section D, so that the qualified gas enters the next section D, and the next section D can be a methanol synthesis section. If the controller 41 monitors that the methane content meets the standard, it opens the connection with the discharge pipe E for discharge, such as returning to the combustion chamber of the pyrolysis gasification device of the previous stage for combustion. The preset standard of methane content is 5Vol%. Of course, it can also be set to less than or greater than 5Vol% according to the specific situation.

[0050] In this embodiment, the high temperature cracking system further includes a cooling device 9, which is located between the outlet end of the combustion furnace 10 and the inlet end of the three-way valve 7. The cooling device 9 has a cooling passage, and the output pipeline 6 includes the cooling passage. In a specific embodiment, the gas detection device 8 is arranged between the cooling device 9 and the three-way valve 7. During the operation of the high temperature cracking system, after the high temperature cracked gas flows out of the combustion furnace 10, it is first cooled by the cooling device 9, and then the methane content is detected by the gas detection device 8 to avoid the gas detection device 8 being impressed or damaged due to the high temperature of the gas.

[0051] This embodiment also provides a control method for preparing synthesis gas by high temperature cracking, comprising:

[0052] In the initial stage, the gas in the furnace is replaced first, including the controller 41 outputting an execution signal to the water vapor pipeline control valve 44, the water vapor pipeline control valve 44 opens to input water vapor, and the water vapor replaces the gas in the furnace. After the replacement is completed, the water vapor input is closed. Specifically, the controller 41 sends an execution signal to the second regulating valve 44a to open. The opening and opening time of the second regulating valve 44a can be selected according to actual needs, such as 100% opening, 3min to 10min opening time, which can be specifically 5min. The gas in the combustion furnace 10 is replaced by water vapor (H2O), and the second regulating valve 44a is closed after the replacement is completed. In addition to determining whether the replacement is completed by setting the valve opening and opening time, the gas flowing through the output pipeline 6 can also be detected by the gas detection device 8. When the gas detection device 8 does not detect oxygen, the second regulating valve 44a is closed.

[0053] The heater 5 is started for preheating. The heat exchange medium in the heater 5 is thermal oil. The heating temperature is maintained at a certain temperature, which can be 350°C to 450°C, such as about 400°C. The temperature maintenance design can be carried out according to actual needs. In order to reduce the waiting time, the heater 5 can be started in advance for preheating preparation, which is convenient for the subsequent preheating of water vapor and oxygen before entering the combustion furnace 10, so that the temperature in the furnace will not be excessively absorbed, and the temperature in the furnace can reach the required temperature (such as 1300°) faster.

[0054] In a specific embodiment, the front-end gas comes from the previous section (such as a pyrolysis gasification device, which can be a rotary kiln or a fluidized bed, etc.), and the front-end gas from the previous section usually has a higher temperature (such as about 800°C). When the front-end gas enters the front-end gas delivery pipeline 1 of this section from the previous section, the first flowmeter 46 detects the flow of the front-end gas, and the front-end gas enters the combustion furnace 10 through the front-end gas delivery pipeline 1. The temperature detection device 45 senses the temperature in the furnace and feeds back a signal to the controller 41. When the controller 41 monitors that the front-end gas flow reaches the preset standard and the temperature in the furnace reaches the preset temperature, the controller 41 outputs an execution signal to the oxygen pipeline control valve 43, and the oxygen pipeline control valve 43 opens. Among them, the preset temperature is set to 750°C to 800°C. When the controller 41 monitors that the temperature in the furnace is smaller than the temperature of the output gas of the previous section, such as within the difference range of 50°C, it means that the front-end gas has entered the combustion furnace 10. Specifically, the controller 41 outputs an execution signal to the first regulating valve 43a, and the first regulating valve 43a opens the preset opening. After the flow rate is detected by the second flowmeter 47, it enters the first heating pipeline 51 of the heater 5 for heating, and then enters the combustion furnace 10 after passing through the first shut-off valve 43b, and is mixed with the front-end gas for combustion, thereby heating the temperature in the furnace. Oxygen is used as an oxidant for the front-end gas cracking reaction. In order to avoid explosion caused by the large amount of oxygen input and contact with the front-end gas in the combustion furnace 10, the preset opening of the first regulating valve 43a is set as needed. It can be set to 10% at the beginning, and then the preset opening increases with time, that is, the opening of the first regulating valve 43a increases from small to large to input oxygen and mix with the front-end gas for combustion, thereby heating the temperature in the furnace. Among them, when the controller 41 monitors that the front-end gas flow rate reaches the preset standard, it means that the front-end gas source is sufficient and can meet the production needs of the cracking reaction. Specifically, the front-end gas source adopts the biogas generated after the biomass is pretreated and pyrolyzed and gasified. The preset standard calculation formula is F=M*k, wherein,

[0055] F represents the flow rate of front-end gas produced under pure oxygen condition, in Nm 3 / h;

[0056] M is the amount of biomass consumed per hour, in kg / h;

[0057] k is a coefficient, the range of k is 1.0~1.2, and the unit is Nm3 / kg; k can be set to 1, 1.05, 1.1, 1.2, etc., and can be adjusted and set according to the specific situation.

[0058] In this embodiment, the front-end gas in the combustion furnace 10 is output from the output pipeline 6 after the combustion reaction, and the methane content is detected by the gas detection device 8. The gas detection device 8 performs gas detection on the synthesis gas flowing through the gas detection device 8 in the output pipeline 6 and feeds back a signal to the controller 41. When the controller 41 detects that the methane content in the synthesis gas exceeds the standard, the controller 41 outputs an execution signal to the three-way valve 7, and the three-way valve 7 switches to a state where the output pipeline 6 is connected to the discharge pipeline E and the output pipeline 6 is disconnected from the next section D, and the unqualified synthesis gas is discharged from the discharge pipeline E. When the controller 41 detects that the methane content in the synthesis gas meets the standard, the controller 41 outputs an execution signal to the three-way valve 7, and the three-way valve 7 switches to a state where the output pipeline 6 is connected to the next section D and the output pipeline 6 is disconnected from the discharge pipeline E, and the qualified synthesis gas is transported to the next section D. The next section D can be a methanol synthesis section for methanol synthesis.

[0059] When the controller 41 detects that the temperature in the furnace has reached a preset reaction temperature (for example, 1100°C to 1300°C), it outputs an execution signal to the steam pipeline control valve 44 on the steam delivery pipeline 3, and the steam pipeline control valve 44 opens, inputting steam into the combustion furnace 10 to undergo a hydrolysis reaction with the front-end gas to generate synthesis gas. Specifically, the controller 41 outputs an execution signal to the second regulating valve 44a to open, and the steam passes through the second regulating valve 44a from the steam source, and the steam flow is detected when passing through the third flowmeter 48, and then enters the second heating pipeline 52 of the heater 5 for heating, and then enters the combustion furnace 10 through the second shut-off valve 44b, and undergoes a hydrolysis reaction with the front-end gas in the furnace at high temperature. In a high temperature environment of 1100°C to 1300°C, in the absence of a catalyst, the methane and tar in the front-end gas will be reformed into hydrogen and carbon monoxide.

[0060] In the above embodiment, during the operation of the high-temperature cracking system, the first flow meter 46, the second flow meter 47 and the third flow meter 48 respectively feed back the input flow rates of the front-end gas, oxygen and water vapor to the controller 41, and feed back to the controller 41. When the flow rate needs to be increased or decreased, the controller 41 sends an execution signal to the corresponding front-end gas regulating valve, oxygen regulating valve (i.e., the first regulating valve 43a), and water vapor regulating valve (i.e., the second regulating valve 44a) to perform corresponding opening adjustment operations to adjust the flow rate. In addition, the furnace cover 10b is provided with an oxygen atomizing nozzle 10c and a water vapor atomizing nozzle 10d, and the outlets of the oxygen atomizing nozzle 10c and the water vapor atomizing nozzle 10d are both facing the combustion furnace 10, the oxygen atomizing nozzle 10c is connected to the oxygen delivery pipeline 2, and the water vapor atomizing nozzle 10d is connected to the water vapor delivery pipeline 3. By providing the oxygen atomizing nozzle 10c, the sprayed oxygen is distributed more evenly in the combustion furnace 10, thereby improving the combustion-supporting effect; similarly, by providing the water vapor atomizing nozzle 10d, the uniformity of the distribution of water vapor is improved, thereby improving the reaction effect. In addition, the heater 5 is provided with a thermometer, and is electrically connected to the controller 41, so as to control the heating temperature of the heater 5. This embodiment Figure 1 In the figure, the feedback signal is represented by a dotted line, and the execution signal is represented by a dashed line.

[0061] In the above embodiment, during the process of preparing synthesis gas by high-temperature cracking system, the front-end gas pipeline cut-off valve 42b, the first cut-off valve 43b and the second cut-off valve 44b are in a normally open state. In addition, the front-end gas pipeline cut-off valve 42b, the first cut-off valve 43b and the second cut-off valve 44b can perform the protection execution action of the high-temperature cracking system. When the bursting disc safety device 30 is actuated, that is, when the bursting disc 30a explodes, the controller 41 controls the front-end gas pipeline cut-off valve 42b, the first cut-off valve 43b and the second cut-off valve 44b to enter the shut-off state to protect the combustion furnace 10 from explosion. Or when the pressure in the combustion furnace 10 detected by the pressure detection device 49 exceeds the set pressure threshold, the controller 41 controls the front-end gas pipeline cut-off valve 42b, the first cut-off valve 43b and the second cut-off valve 44b to enter the shut-off state to protect the combustion furnace 10 from explosion.

[0062] Some technical implementations in the above embodiments may be combined or replaced.

[0063] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0064] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0065] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] The technical principles of the present application are described above in combination with specific implementations, but it should be noted that the above descriptions are only for explaining the principles of the present application and cannot be interpreted in any way as a specific limitation on the protection scope of the present application. Based on the explanation here, technicians in this field can think of other specific implementations or equivalent replacements of the present application without creative work, and they will all fall within the protection scope of the present application.

Claims

1. A high temperature cracking system, characterized in that: It includes a combustion furnace, a front-end gas delivery pipeline, an oxygen delivery pipeline and a water vapor delivery pipeline, wherein the front-end gas delivery pipeline connects the combustion furnace and the front-end gas source, the oxygen delivery pipeline connects the combustion furnace and the oxygen source, and the water vapor delivery pipeline connects the combustion furnace and the water vapor source. The high-temperature cracking system also includes a control mechanism, which includes a controller, a front-end gas pipeline control valve, an oxygen pipeline control valve, a water vapor pipeline control valve and a temperature detection device. The front-end gas pipeline control valve is installed on the front-end gas delivery pipeline, the oxygen pipeline control valve is installed on the oxygen delivery pipeline, the water vapor pipeline control valve is installed on the water vapor delivery pipeline, and the temperature detection device is installed on the combustion furnace; the front-end gas pipeline control valve, the oxygen pipeline control valve, the water vapor pipeline control valve and the temperature detection device are all electrically connected to the controller.

2. The high temperature cracking system according to claim 1, characterized in that: The controller is used to regulate the front-end gas pipeline control valve, oxygen pipeline control valve and water vapor pipeline control valve, so that the front-end gas of the high-temperature cracking system enters the combustion furnace under the reaction conditions for cracking reaction to generate synthesis gas, and the temperature of the cracking reaction is ≥1000°C.

3. The high temperature cracking system according to claim 1, characterized in that: The front-end air pipeline control valve includes a front-end air pipeline cut-off valve; The oxygen pipeline control valve comprises a first regulating valve and a first shut-off valve, wherein the first shut-off valve is arranged closer to the combustion furnace than the first regulating valve; The water vapor pipeline control valve includes a second regulating valve and a second cut-off valve. Compared with the second regulating valve, the second cut-off valve is arranged closer to the combustion furnace.

4. The high temperature cracking system according to claim 3, characterized in that: The control mechanism further comprises a first flow meter, a second flow meter and a third flow meter, wherein the first flow meter is installed on the front-end gas delivery pipeline, and the first flow meter is arranged to be connected to the input end of the front-end gas pipeline cut-off valve; the second flow meter is installed on the oxygen delivery pipeline, and the second flow meter is arranged to be close to the output end of the first regulating valve; the third flow meter is installed on the water vapor delivery pipeline, and the third flow meter is arranged to be close to the output end of the first regulating valve; The first flow meter, the second flow meter and the third flow meter are all electrically connected to the controller.

5. The high temperature cracking system according to claim 3, characterized in that: The pyrolysis system further includes a heater having a partial section of at least one of the steam delivery pipeline and the oxygen delivery pipeline.

6. The high temperature cracking system according to claim 5, characterized in that: The heater includes a first heating pipeline, the oxygen delivery pipeline includes the first heating pipeline, and the first heating pipeline is located between the first regulating valve and the first shut-off valve; The heater further includes a second heating pipeline, the water vapor transport pipeline includes the second heating pipeline, and the second heating pipeline is located between the second regulating valve and the second shut-off valve.

7. The high temperature cracking system according to claim 1, characterized in that: The high-temperature cracking system further includes an output pipeline and a three-way valve, wherein the output pipeline is connected to the combustion furnace and the inlet end of the three-way valve, and the two outlet ends of the three-way valve are respectively connected to the next section and the discharge pipeline; the output pipeline is provided with a gas detection device, and the gas detection device and the three-way valve are both electrically connected to the controller; The high-temperature cracking system also includes a cooling device, which is located between the outlet end of the combustion furnace and the inlet end of the three-way valve. The cooling device has a cooling passage, and the output pipeline includes the cooling passage. The gas detection device is arranged between the cooling device and the three-way valve.

8. A control method for preparing synthesis gas by high temperature cracking, characterized in that: include: The front-end gas enters the combustion furnace through the front-end gas delivery pipeline. The temperature detection device senses the temperature in the furnace and feeds back a signal to the controller. When the controller detects that the temperature in the furnace reaches the preset temperature, the controller outputs an execution signal to the oxygen pipeline control valve. The oxygen pipeline control valve opens and inputs oxygen into the combustion furnace to mix with the front-end gas for combustion. When the controller detects that the temperature in the furnace has reached the preset reaction temperature, it outputs an execution signal to the steam pipeline control valve on the steam delivery pipeline. The steam pipeline control valve opens, and steam is input into the combustion furnace to undergo a hydrolysis reaction with the front-end gas to generate synthesis gas.

9. The control method for preparing synthesis gas by high temperature cracking according to claim 8, characterized in that: Before the front-end gas enters the combustion furnace through the front-end gas delivery pipeline, a furnace gas replacement step is also performed, and the furnace gas replacement step includes: a controller outputs an execution signal to a water vapor pipeline control valve, the water vapor pipeline control valve is opened to input water vapor, the water vapor replaces the gas in the furnace, and the water vapor input is closed after the replacement is completed; Before the oxygen is input into the combustion furnace and mixed with the front gas for combustion, the following steps are also performed: the oxygen is heated by a heater; Before the water vapor is input into the combustion furnace to undergo a hydrolysis reaction with the front-end gas to generate synthesis gas, the following steps are also performed: the water vapor is heated by a heater; The temperature of the heater is maintained at 350°C-450°C.

10. The control method for preparing synthesis gas by high temperature cracking according to claim 8, characterized in that: Before the controller outputs an execution signal to the oxygen pipeline control valve, the following conditions must be met: the first flow meter detects that the front-end gas flow reaches a preset standard, and the preset standard calculation formula is F=M*k, where F represents the flow rate of front-end gas produced under pure oxygen condition, in Nm 3 / h; M is the amount of biomass consumed per hour, in kg / h; k is the coefficient, the range of k is 1.0~1.2, and the unit is Nm 3 / kg; The controller outputs an execution signal to the oxygen pipeline control valve, the oxygen pipeline control valve opens, and the oxygen is input into the combustion furnace to mix with the front-end gas for combustion. The specific steps are: the controller outputs an execution signal to the first regulating valve, the first regulating valve opens a preset opening to input oxygen into the combustion furnace to mix with the front-end gas for combustion, and heats the temperature in the furnace, wherein the preset opening is set according to needs, and the preset opening of the first regulating valve increases with time.

11. A control method for preparing synthesis gas by high temperature cracking according to any one of claims 8 to 10, characterized in that: The control method further comprises a methane content detection step, wherein the methane content detection step comprises: The synthesis gas is output from the output pipeline and detected by the gas detection device, and the signal is fed back to the controller. When the methane content in the synthesis gas is detected to be excessive, the controller outputs an execution signal to the three-way valve to discharge the unqualified synthesis gas from the discharge pipeline; when the methane content in the synthesis gas is detected to be up to the standard, the controller outputs an execution signal to the three-way valve to transport the qualified synthesis gas to the next section; The preset standard of methane content is 5 Vol%.

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