High-pressure gas production furnace

Abstract

The utility model relates to a high-pressure gas production furnace which is characterized by comprising a furnace body, a front furnace system and a high-pressure deslagging system, a molten iron pool, a slag pool and an upper hearth are sequentially arranged in the furnace body from bottom to top; the molten iron tank is provided with an iron inlet and an iron outlet, the slag tank is provided with a slag outlet, at least one organic raw material feeding device and at least one oxygen lance, and a product gas outlet is formed in the top of the upper hearth; the front-mounted furnace system is provided with a front-mounted furnace body connected with the iron inlet and a first pressure maintaining bin communicated with the front-mounted furnace body. The high-pressure deslagging system comprises a second pressure maintaining bin and a pressure equalizing bin. The high temperature and catalytic action of molten iron are utilized to provide superexcellent conditions for cracking of organic raw materials, most of the organic raw materials can be gasified into clean combustible gas, the cracking process is rapid and thorough, toxic and harmful substances such as tar and dioxin cannot be generated, meanwhile, the device can meet the working condition pressure requirements of subsequent procedures, and the production efficiency is improved. And the subsequent pressurizing procedure is omitted, and good economical efficiency is achieved.

Description

[0001] Field:

[0002] The invention belongs to the field of producing energy gas or chemical raw material gas. Technical background:

[0003] Biomass methanol is an optimal green energy source suitable for shipping and heavy truck transportation. It is currently in the stage of technical development and commercial trial and has broad prospects.

[0004] All technologies involved in the gasification process of biomass methanol production have weaknesses: the fixed-bed process suffers from the high concentration of methane and tar in the synthesis gas, making removal costly; the circulating fluidized bed process, while somewhat more effective, still suffers from this weakness; the entrained-flow flow process requires the biomass feedstock to be processed into a fine powder, making it difficult to implement; and the molten iron gasifier, while relatively advantageous, still suffers from the lack of an ideal method for producing high-pressure synthesis gas to meet the pressure requirements of subsequent methanol production. This invention specifically addresses these issues. Utility model content:

[0005] A high-pressure gasification furnace is characterized by comprising a furnace body (1), a pre-furnace system, and a high-pressure slag discharge system.

[0006] The furnace body (1) is provided with a molten iron pool (10), a slag pool (11), and an upper furnace (29) from bottom to top. The molten iron pool (10) is provided with an iron inlet (14) and an iron outlet (12). The slag pool (11) is provided with a furnace body slag outlet (9), at least one organic raw material feeding device, at least one oxygen lance (26), and a synthesis gas outlet (33) is provided at the top of the upper furnace (29).

[0007] The pre-furnace system is provided with a pre-furnace body (15) connected to an iron inlet (14) and a first pressure-maintaining chamber (16) connected to the pre-furnace body (15). The pre-furnace system is provided with a liquid level position sensor (35), and the pressure-maintaining chamber (16) is provided with an inlet (18), an inlet sealing valve (17), and a pressure equalizing device.

[0008] The inlet (18) of the first pressure-maintaining chamber (16) is used to charge carbon powder, slag agent, molten iron, etc. into the furnace body when starting the furnace; during operation, the molten iron pool (10) can also be replenished with materials through the inlet (18). During normal production, the liquid level of the molten iron pool (10) is monitored by the internal liquid level position sensor (35).

[0009] The first pressure-maintaining chamber (16) is provided with a pressure-equalizing device for maintaining the difference between the gas pressure in the pressure-maintaining chamber (16) and the gas pressure in the furnace body (1) within the design requirement during operation, so as to keep the molten iron level in the front furnace body (15) at the same height as the molten iron level in the furnace body (1). The sealing valve (17) at the inlet of the first pressure-maintaining chamber (16) is closed and sealed during pressure maintenance and opened during material addition.

[0010] The high-pressure slag discharge system comprises a second pressure-maintaining chamber (3) and a pressure-equalizing chamber (4); the second pressure-maintaining chamber (3) is provided with a second pressure-maintaining chamber slag inlet (38), a first water gun (32), a first water slag outlet (39), and a first water slag outlet sealing valve (5); the second pressure-maintaining chamber slag inlet (38) is connected to the furnace body slag outlet (9), and the first water slag outlet (39) is connected to the pressure-equalizing chamber (4); the pressure-equalizing chamber is provided with a pressure-equalizing air inlet device (6), a pressure-equalizing air outlet device (7), a second water slag outlet (40), and a second water slag outlet sealing valve (8).

[0011] When the second pressure-maintaining bin slag inlet (38) is directly connected to the furnace body slag outlet (9), the slag in the furnace body (1) overflows or flows into the second pressure-maintaining bin (3) under the pressure difference between the furnace body (1) and the second pressure-maintaining bin (3). The first water gun (32) in the bin directly sprays low-temperature water on the slag to convert the slag into a water-slag product, which can generally be used to make cement. The water-slag and water are deposited at the bottom of the second pressure-maintaining bin. Steam enters the furnace body from the slag inlet and outlet and is mixed with the synthesis gas and discharged. The heat can be utilized after heat exchange. If steam is not desired to enter the synthesis gas, the insulated slag conveying pipe (2) between the furnace body slag outlet (9) and the second pressure-maintaining bin slag inlet (38) can also be set as a U-shaped pipe, in which the slag can block the steam from entering the furnace body. In this case, the steam in the second pressure-maintaining bin (3) can be extracted and utilized under the premise of maintaining pressure.

[0012] When the water and slag in the second pressure-maintaining chamber (3) reach a certain amount, the second slag outlet sealing valve (8) is closed, and pressurized gas is introduced into the pressure-maintaining chamber (4) through the pressure-equalizing air inlet device (6), increasing the pressure of the pressure-maintaining chamber (4) to the pressure level of the second pressure-maintaining chamber (3), and then the first slag outlet sealing valve (5) controlling the first slag outlet (39) is opened, and the water and slag in the second pressure-maintaining chamber (3) are discharged to the pressure-maintaining chamber (4) and then the first slag outlet sealing valve (5) is closed. The pressure is reduced to atmospheric pressure by the pressure-equalizing air outlet device (7) of the pressure-maintaining chamber (4), and then the second slag outlet sealing valve (8) is opened to discharge the water and slag in the pressure-maintaining chamber (4) out of the system. The second slag outlet sealing valve (8) is then closed, and the system returns to the initial state, preparing for the next cycle of slag discharge from the second pressure-maintaining chamber (3). This periodic repetition of the operation ensures that the slag discharge of the gasification furnace can be carried out stably under a set constant high pressure. As for the subsequent treatment of the discharged slag, it belongs to conventional technology and will not be described in detail.

[0013] Furthermore, the invention is characterized in that the organic raw material feeding device can be an organic particle spray gun (24) inserted into the slag pool, or an organic particle feeding device with an opening provided in the molten iron pool (10), or an organic briquette feeding device with an opening provided in the molten iron pool (10) or the slag pool (11). The advantage of using organic particles is that the particles have a large specific surface area, which is conducive to cracking in the gasification furnace, but the granulation of organic raw materials increases the gasification cost. The cost of briquette raw materials is low, but the reaction rate is slow, the briquette feeding device technology is relatively complex, and the investment is high; if granular raw materials are chosen, a spray gun is a simple and reliable option, but the spray gun will greatly shorten its life when working in the molten iron pool (10), and it will not be able to completely feed the granular raw materials into the molten iron pool (10) when working in the slag pool (11). In addition, the carrier gas sprayed by the spray gun will also absorb heat from the molten iron pool and the slag pool, which will increase the energy consumption of the system. Alternatively, similar to briquetting, the granular raw materials can be fed directly into the molten iron pool via an organic granular feeder equipped with a screw feed system or a push rod pusher system. However, this method is technically complex and requires high construction costs. Each of the above raw material forms and corresponding organic raw material delivery devices has its own advantages and disadvantages. In actual projects, the raw material type should be selected based on a comprehensive consideration of various factors, and the optimal organic raw material delivery device should be determined.

[0014] Furthermore, it is characterized in that the nozzle of the oxygen lance (26) can be arranged in the upper furnace (29) or in the slag pool (11).

[0015] Furthermore, it is characterized in that the pre-furnace system is provided with an electric heating device (34) to prevent the molten iron in the pre-furnace body (15) from freezing.

[0016] Furthermore, it is characterized in that: the pressure equalizing device of the pre-furnace system can be a pressure charging device (36) and a pressure relief device (37), and during the pressure charging process, N2 or other pressure equalizing gas is charged into the first pressure-maintaining chamber (16) through the pressure charging device (36) to increase the pressure, and during the pressure relief work, the pressure relief device (37) is opened to discharge the gas to reduce the pressure. The pressure equalizing device of the pre-furnace system can also be a pressure equalizing pipe (42), and the two ends of the pressure equalizing pipe (42) are respectively connected to the first pressure equalizing pipe interface (41) located on the furnace hearth (29) of the furnace body and the second pressure equalizing pipe interface (43) located on the first pressure-maintaining chamber (16) of the pre-furnace system. Through the connection between the first pressure-maintaining chamber (16) and the furnace hearth (29) of the furnace body, the pressure in the pre-furnace body (15) and the furnace body (1) is adjusted to keep the molten iron liquid level in the pre-furnace body (15) and the molten iron liquid level in the furnace body (1) the same or a fixed difference value that can be controlled.

[0017] Furthermore, it is characterized in that: the synthesis gas outlet (33) can be connected in sequence with the cooling flue (19), the settling chamber (27), the high-temperature dust collector (20), the heat exchanger (21), the desulfurization device (52), the bag dust collector (22), and the first pressure regulating valve (23). The high-temperature dust collector (20) can be a cyclone or a filter. The filtering method can be ceramic or metal mesh. The steam generated by the cooling flue (19) and the heat exchanger (21) is used for hydrogen production, power generation and preheating solid raw materials, and can also be used as other heat sources. The first pressure regulating valve (23) is generally in the form of a pressure regulating valve group, which can adjust the output at a constant pressure according to the working pressure required by the subsequent chemical synthesis process. Some of the above equipment can be selected according to actual conditions.

[0018] Furthermore, the invention is characterized in that the second pressure-maintaining chamber (3) can be provided with a steam outlet (51), and the steam outlet (51) of the second pressure-maintaining chamber is sequentially connected to the steam generator set (46) and the second pressure regulating valve (47). During the operation of the second pressure-maintaining chamber (3), a large amount of high-pressure steam is generated, and the steam generator set (46) can be used to generate residual pressure power for the high-pressure steam, thereby achieving the purpose of efficient energy recovery.

[0019] Furthermore, the feature is that the second pressure-maintaining chamber (3) can be provided with a filtering device (45), and the filtering device (45) can be a filter bag, a ceramic filter tube, a plastic-sintered plate, etc.

[0020] Furthermore, the invention is characterized in that a dust-cleaning and water-flushing device (48) is provided below the filtering device (45) to clean the filtering device (45) regularly to ensure normal production work.

[0021] Furthermore, it is characterized in that: the upper valve bodies of the first water slag outlet sealing valve (5) and the second water slag outlet sealing valve (8) are the water slag outlet pipes (501) of the first and second water slag outlets (39) (40), and a concentric short tube (502) is provided along the outer side of the pipe wall at the lower end of the water slag outlet pipe (501), and its length is not limited, generally about 10 cm. An annular sealing lip ring (503) is tightly attached to the inner side of the lower end of the short tube (502), and the lower edge of the annular sealing lip ring (503) is appropriately tapered inward; the lower edge of the sealing lip ring (503) is slightly lower than the lower edge of the water slag outlet pipe (501), and the lower edge of the short tube (502) is slightly higher than the lower edge of the water slag outlet pipe (501); the upper end of the short tube (502) is sealed and welded to the outer surface of the pipe wall of the water slag outlet pipe (501) to form a sealed air chamber (509); in the short tube (502 ) is provided with a sealing air inlet (510) connected to an external sealing air source (505); the lower valve body is a valve plate (506) that can cover the sealing lip ring (503), one end of which is rigidly connected to the rotating shaft (507), and the rotating shaft (507) is installed on the bearing seat (508). One end of the rotating shaft (507) passes through the wall of the pressure equalizing bin (4) and is connected to the driving device (504) outside the bin. The gap through which the rotating shaft (507) passes through the bin wall can be sealed by an air chamber sealing method. The structure of the feed inlet sealing valve (17) of the pre-furnace pressure maintaining bin (16) can be the same as that of the first and second water slag outlet sealing valves (5)(8).

[0022] Furthermore, it is characterized in that: the sealing lip ring (503) can be made of rubber material or other flexible elastic material that meets the requirements.

[0023] Furthermore, the invention is characterized in that a heat preservation gun (25) can be provided on the furnace wall of the furnace chamber (29). The heat preservation gun (25) can be used to dry the furnace during the construction process, maintain the furnace temperature during the production interval, and complete the furnace preheating when the furnace is restarted after cooling. The heat preservation gun (25) can generally use natural gas as fuel.

[0024] Furthermore, the invention is characterized in that: an insulated slag conveying pipe (2) is provided to connect the furnace slag outlet (9) with the second pressure-holding bin slag inlet (38), and an insulation device (28) is provided if necessary, and the second pressure-holding bin (3) is provided with an air outlet device (30) and an air inlet device (31). Since the movement of materials in the second pressure-holding bin (3) and the pressure-equalizing bin (4) is based on gravity, a considerable height is required for the layout, which may far exceed the liquid level of the slag layer in the furnace. By connecting the insulated slag conveying pipe and then adjusting the pressure in the second pressure-holding bin through the air outlet device (30) and the air inlet device (31) provided in the second pressure-holding bin (3), the slag can be diverted to the second pressure-holding bin slag inlet (38) at a high position and enter the second pressure-holding bin (3). Construction investment can be greatly reduced.

[0025] Furthermore, the invention is characterized in that: a second water gun (44) is provided at one end of the heat-insulating slag conveying pipe (2) near the furnace body slag outlet (9), and the slag water in the heat-insulating slag conveying pipe (2) can be conveyed by a slurry pump and a slurry pump conveying pipeline, a built-in bucket elevator, or gas conveying. After the slag is discharged from the furnace body slag outlet (9), the second water gun (44) sprays low-temperature water on the slag to convert the slag into a water slag product, and the water slag product can be conveyed to the second pressure-maintaining bin (3) by means of a slurry pump and a slurry pump conveying pipeline, a built-in bucket elevator, or gas conveying, and the heat-insulating device (28) is eliminated.

[0026] Furthermore, it is characterized in that a slag ditch (49) is provided behind the second water slag outlet (40), leading to a slag pool (50), for further cooling and separating the water slag, and also having the function of storing slag.

[0027] The specific furnace wall structures, shapes and sizes of the heat preservation gun (25), solid particle spray gun (24), oxygen gun (26), first water gun (32), second water gun (44), electric heating device (34), heat preservation device (28), driving device (504), charging device (36), pressure relief device (37), air inlet device (31), air outlet device (30), pressure equalizing air inlet device (6), pressure equalizing air outlet device (7), cooling flue (19), settling chamber (27), high-temperature dust collector (20), heat exchanger (21), bag filter (22), first pressure regulating valve (23), filtering device (45), steam generator set (46), second pressure regulating valve (47), dust cleaning and flushing device (48), slag ditch (49), slag pool (50), desulfurization device (52), furnace body (1) and front furnace body (15) are all conventional mature technologies and are not described in detail here.

[0028] As described above, the present invention, based on its process and structural principles, can produce syngas at any pressure. This allows the system to be manufactured based on the operating pressure requirements of subsequent syngas application processes, eliminating the need for subsequent pressurization steps and achieving excellent economic efficiency. This ideally achieves the goal of producing high-pressure chemical feed gas.

[0029] It's important to note that the aforementioned technical background primarily focuses on biomass. However, another advantage of this technology is its applicability not only to biomass but also to the recycling and gasification of various other solid wastes. This technology is also applicable to production processes that simultaneously produce chemical feedstock gas and molten iron. The high-pressure slag tapping technology is also applicable to direct reduction smelting ironmaking processes.

[0030] The descriptions of directions and positions, such as up, down, inside, outside, left, right, top, and bottom, in this document are based on the directions or positions shown in the accompanying drawings. These are for ease of description only and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, these terms should not be construed as limitations of the present invention. Description of the drawings:

[0031] Figure 1 This is a schematic diagram of Example 1.

[0032] Figure 2 This is a schematic diagram of the structure of the first and second water slag outlet sealing valves.

[0033] Figure 3 This is a schematic diagram of Example 2.

[0034] 1-Furnace body 2-Insulated slag conveying pipe 3-Second pressure holding bin 4-Equalizing pressure bin 5-First water slag outlet sealing valve 6-Equalizing pressure air inlet device 7-Equalizing pressure air outlet device 8-Second water slag outlet sealing valve 9-Furnace body slag outlet 10-Molten iron pool 11-Slag pool 12-Tap hole 13-Solid briquette inlet 14-Iron inlet 15-Pre-furnace body 16-First pressure holding bin 17-Feed port sealing valve 18-Feed port 19-Cooling flue 20-High temperature dust collector 21-Heat exchanger 22-Bag dust collector 23-First pressure regulating valve 24-Organic particle spray gun 25-Insulation gun 26-Oxygen gun 27-Sedimentation chamber 28-Insulation device 29-Upper furnace 30-Air outlet device 31-Air inlet device 32-First water gun 33-Synthesis Gas outlet 34 - electric heating device 35 - liquid level position sensor 36 - charging device 37 - pressure relief device 38 - second pressure holding bin slag inlet 39 - first water slag outlet 40 - second water slag outlet 41 - first interface of equalizing pressure pipe 42 - equalizing pressure pipe 43 - second interface of equalizing pressure pipe 44 - second water gun 45 - filtering device 46 - steam generator set 47 - second pressure regulating valve 48 - dust cleaning and flushing device 49 - slag ditch 50 - slag pool 51 steam outlet 52 - desulfurization device 501 - water slag outlet pipe 502 - short pipe 503 - sealing lip ring 504 - driving device 505 - sealing air source 506 - valve plate 507 - rotating shaft 508 - bearing seat 509 - sealing air chamber 510 - sealing air inlet Specific implementation method:

[0035] Example 1

[0036] Combine Figure 1 and Figure 2 A high-pressure gasification furnace according to Example 1 is described, which includes a furnace body 1, a pre-furnace system, and a high-pressure slag discharge system.

[0037] From bottom to top, the furnace body 1 contains a molten iron pool 10, a slag pool 11, and an upper hearth 29. The molten iron pool is equipped with an iron inlet 14 and an iron outlet 12. The slag pool has a slag outlet 9, a solid particle injection lance 24, and an oxygen lance 26 inserted into the slag pool 11. The molten iron pool 10 has an inlet 13 for solid briquette. A heat preservation lance 25 is installed on the furnace wall of the upper hearth 29, and a syngas outlet 33 is located at the top of the upper hearth 29. The syngas outlet 33 is connected in sequence to a cooling flue 19, a settling chamber 27, a high-temperature dust collector 20, a heat exchanger 21, a desulfurization device 52, a bag filter 22, and a first pressure regulating valve 23.

[0038] The high-temperature dust collector 20 is a cyclone dust collector. The steam generated by the cooling flue 19 and heat exchanger 21 is used partly for power generation and partly for preheating the solid organic feedstock. The first pressure regulating valve 23 is set to a constant output pressure of 10 MPa to meet the pressure requirements of the feed gas for subsequent methanol synthesis.

[0039] The pre-furnace system comprises a pre-furnace body 15 connected to the iron inlet 14 of the furnace body 1 and a first pressure-maintaining chamber 16 connected to the pre-furnace entrance. The first pressure-maintaining chamber 16 has an inlet 18, at which a sealing valve 17 is installed. A liquid level sensor 35 is located within the first pressure-maintaining chamber 16. The first pressure-maintaining chamber 16 also features a gas charging device 36 and a pressure relief device 37. The pre-furnace body 15 is also equipped with an electric heating device 34.

[0040] The feed port 18 of the pre-furnace is used to feed raw materials such as carbon powder, flux, molten iron, iron ore, etc. into the furnace body 1, and the height of the slag and iron liquid level is monitored by the liquid level position sensor 35 provided in the first pressure-maintaining bin 16.

[0041] The first pressure-maintaining chamber 16 is equipped with a pressure-charging device 36 and a pressure-relieving device 37. During operation, the pressure difference between the gas pressure in the first pressure-maintaining chamber 16 and the gas pressure within the furnace body 1 is maintained at the designed level, thereby maintaining the molten iron level in the pre-furnace at the same height as the molten iron level within the furnace body 1. The inlet sealing valve 17 of the first pressure-maintaining chamber 16 is closed during pressure maintenance and opened during material addition.

[0042] The high-pressure slag discharge system includes a second pressure-maintaining bin 3 and a pressure-equalizing bin 4; the second pressure-maintaining bin 3 is provided with a slag inlet 38, a first water slag outlet 39, a first water gun 32, and a first water slag outlet sealing valve 5; the slag inlet 38 of the second pressure-maintaining bin 3 is connected to the slag outlet 9 of the furnace body 1, and the first water slag outlet 39 is connected to the pressure-equalizing bin 4; the pressure-equalizing bin 4 is provided with a pressure-equalizing air inlet device 6, a pressure-equalizing air outlet device 7, a second water slag outlet 40 and a second water slag outlet sealing valve 8.

[0043] The slag outlet 9 of the furnace body 1 is connected to the slag inlet 38 of the second pressure-maintaining chamber 3 via an insulated slag conveying pipe 2, which is covered with an insulation device 28. The second pressure-maintaining chamber 3 is equipped with a gas outlet 30 and a gas inlet 31. By adjusting the gas pressure in the second pressure-maintaining chamber 3, the slag in the furnace body 1 flows into the second pressure-maintaining chamber 3 due to the pressure difference. A first water gun 32 in the chamber sprays low-temperature water directly onto the slag, converting it into a slag product for cement production. The water and slag are deposited at the bottom of the second pressure-maintaining chamber 3. Steam enters the furnace body 1 through the slag outlet and inlet, mixes with the syngas, and is discharged. The heat generated can be utilized after heat exchange.

[0044] When the amount of water and water slag in the second pressure-maintaining bin 3 reaches a certain level, close the second water slag outlet sealing valve 8, and fill the pressure equalizing bin 4 with pressurized gas through the pressure equalizing air inlet device 6 to increase the pressure of the pressure equalizing bin 4 to the pressure level of the second pressure-maintaining bin 3. Then open the first water slag outlet sealing valve 5, discharge the water and water slag in the second pressure-maintaining bin 3 into the pressure equalizing bin 4, and then close the first water slag outlet sealing valve 5. Use the pressure equalizing air outlet device 7 of the pressure equalizing bin 4 to exhaust and reduce the pressure to atmospheric pressure, then open the second slag outlet sealing valve 8, and discharge the water and water slag in the pressure equalizing bin 4 into the slag pool 50 through the slag ditch 49 to further cool, separate, and store the water slag. Then close the second slag outlet sealing valve 8, return to the initial state, and prepare for the next slag discharge cycle of the second pressure-maintaining bin 3. Repeat the operation in this way.

[0045] The upper valve body of the first water slag outlet sealing valve 5 and the second water slag outlet sealing valve 8 is the water slag outlet pipe 501 itself, and a concentric short tube 502 is provided on the outer side of the pipe wall at the lower end of the outlet pipe 501. The length of the short tube 502 is 10 cm, and a ring-shaped rubber sealing lip ring 503 is tightly attached to the inner side of the lower end of the short tube 502. The lower edge of the rubber sealing lip ring 503 is appropriately reduced in diameter inward, and the lower edge of the installed rubber sealing lip ring 503 is slightly lower than the lower edge of the water slag outlet pipe 501, while the lower edge of the short tube 502 is slightly higher than the lower edge of the water slag outlet pipe 501; the upper edge of the short tube 502 is in contact with the outer surface of the wall of the water slag outlet pipe 501. The annular seal is welded to form an annular sealed air chamber 509; a sealing air inlet 510 is provided on the short tube 502, which is connected to the external sealing air source 505 through a pipeline; the lower valve body is a circular valve plate 506 with a diameter slightly larger than the diameter of the short tube 502 of the upper valve body, and can be rotated to cover the lower end face of the upper valve body, one side of which is slightly extended and welded to a rotating shaft 507, and the rotating shaft 507 is installed on the bearing seat and is axially fixed. One end of the rotating shaft 507 passes through the warehouse wall and is connected to the driving device 504 outside the warehouse. The driving device 504 is a motor; the gap between the rotating shaft 507 and the warehouse wall can be sealed by an air chamber sealing method.

[0046] The structure of the sealing valve 17 of the inlet of the pre-furnace pressure-maintaining bin 16 is the same as that of the first and second water slag outlet sealing valves 5 and 8.

[0047] Example 2

[0048] Combine Figure 3 A high-pressure gasification furnace according to Example 2 is described, which differs from Example 1 in that the steam outlet 51 of the second pressure-maintaining chamber 3 is connected in sequence with the steam generator set 46 and the second pressure-regulating valve 47, and a second water gun 44 is provided at one end of the insulated slag conveying pipe 2 near the furnace body slag outlet 9.

[0049] After the slag is discharged from the slag outlet 9 of the furnace body, a second water gun 44 is used to spray low-temperature water on the slag to turn the slag into a water slag product. The water slag product is then transported to the second pressure-maintaining bin 3 through a slurry pump and slurry pump pipeline, a built-in bucket elevator, gas transportation, etc., and the heat preservation device 28 is eliminated. During the operation of the second pressure-maintaining bin 3, a large amount of high-pressure steam is generated. The steam generator set 46 can be used to generate residual pressure electricity on the high-pressure steam to achieve the purpose of efficient energy recovery. Slag dust will be mixed in the high-pressure steam, and the steam needs to be dust-removed before it can be used in subsequent links. Therefore, a filtering device 45 is provided in the second pressure-maintaining bin 3. The filtering device 45 is in the form of a filter bag. After working for a period of time, the slag dust will adhere to the outer surface of the filter bag. A dust cleaning and flushing device 48 needs to be provided under the filter bag to clean the filter bag regularly to ensure normal production.

[0050] At the same time, the pressure equalizing device of the pre-furnace system is a pressure equalizing pipe 42, and the two ends of the pressure equalizing pipe 42 are respectively connected to the first interface 41 of the pressure equalizing pipe located in the furnace 29 on the furnace body and the second interface 43 of the pressure equalizing pipe located in the first pressure maintaining chamber 16 of the pre-furnace system. Through the connection between the first pressure maintaining chamber 16 and the furnace 29 on the furnace body, the pressure in the pre-furnace body 15 and the furnace body 1 is adjusted to keep the molten iron liquid level in the pre-furnace body 15 at the same height as the molten iron liquid level in the furnace body 1.

Claims

1. A high pressure gasification furnace, characterized in that: It includes a furnace body (1), a pre-furnace system, and a high-pressure slag discharge system; The furnace body (1) is provided with a molten iron pool (10), a slag pool (11), and an upper furnace (29) from bottom to top. The molten iron pool is provided with an iron inlet (14) and an iron outlet (12), the slag pool is provided with a furnace body slag outlet (9), at least one organic raw material feeding device is provided, at least one oxygen lance (26) is provided, and a synthesis gas outlet (33) is provided at the top of the upper furnace (29). The pre-furnace system is provided with a pre-furnace body (15) connected to an iron inlet (14) and a first pressure-maintaining chamber (16) connected to the pre-furnace body (15); the pre-furnace system is provided with a liquid level position sensor (35); the first pressure-maintaining chamber (16) is provided with an inlet (18), an inlet sealing valve (17), and a pressure equalizing device; The high-pressure slag discharge system comprises a second pressure-maintaining chamber (3) and a pressure-equalizing chamber (4); the second pressure-maintaining chamber (3) is provided with a second pressure-maintaining chamber slag inlet (38), a first water gun (32), a first water slag outlet (39), a first water slag outlet sealing valve (5), an air inlet device (31), and an air outlet device (30); the second pressure-maintaining chamber slag inlet (38) is connected to the furnace body slag outlet (9), and the first water slag outlet (39) is connected to the pressure-equalizing chamber (4); the pressure-equalizing chamber is provided with a pressure-equalizing air inlet device (6), a pressure-equalizing air outlet device (7), a second water slag outlet (40), and a second water slag outlet sealing valve (8).

2. A high pressure gasification furnace according to claim 1, characterized in that: The organic raw material feeding device can be an organic particle spray gun (24) inserted into the slag pool, or can be an organic particle feeding device with an opening provided in the molten iron pool (10), or can be an organic briquette feeding device with an opening provided in the molten iron pool (10) or the slag pool (11).

3. The high pressure gasification furnace according to claim 1, wherein: The nozzle of the oxygen lance (26) can be arranged in the upper furnace (29), or can be arranged in the slag pool (11).

4. The high pressure gasification furnace according to claim 1, wherein: The pre-furnace system is provided with an electric heating device (34).

5. The high pressure gasification furnace according to claim 1, wherein: The pressure equalizing device of the pre-furnace system can be a pressure charging device (36) and a pressure relief device (37); or a pressure equalizing pipe (42), the two ends of which are respectively connected to the first pressure equalizing pipe interface (41) located in the furnace (29) on the furnace body and the second pressure equalizing pipe interface (43) located in the first pressure maintaining chamber (16) of the pre-furnace system; the air inlet and outlet pressure regulating devices of the first pressure maintaining chamber (16), the second pressure maintaining chamber (3) and the pressure equalizing chamber (4) can be combined into the same pipe.

6. The high pressure gasification furnace according to claim 1, wherein: The synthesis gas outlet (33) can be connected to the cooling flue (19), the settling chamber (27), the high-temperature dust collector (20), the heat exchanger (21), the desulfurization device (52), the bag filter (22), and the first pressure regulating valve (23) in sequence.

7. The high pressure gasification furnace according to claim 1, wherein: The second pressure-maintaining chamber (3) may be provided with a steam outlet (51), and the steam outlet (51) is sequentially connected to the steam generator set (46) and the second pressure regulating valve (47).

8. The high pressure gasification furnace according to claim 7, characterized in that: The second pressure-maintaining chamber (3) may be provided with a filtering device (45), and the filtering device (45) may be a filter bag, a ceramic filter tube, or a plastic-sintered plate.

9. The high pressure gasification furnace according to claim 8, characterized in that: A dust-cleaning and water-flushing device (48) may be provided below the filtering device (45).

10. The high pressure gasification furnace according to claim 1, characterized in that: The upper valve bodies of the first water slag outlet sealing valve (5) and the second water slag outlet sealing valve (8) are the water slag outlet pipes (501) of the first water slag outlet (39) and the second water slag outlet (40), and a concentric short tube (502) is sleeved on the outer side of the pipe wall at the lower end of the water slag outlet pipe (501), and an annular sealing lip ring (503) is tightly fitted on the inner side of the lower end of the short tube (502), and the lower edge of the annular sealing lip ring (503) is appropriately tapered inward; the lower edge of the sealing lip ring (503) is lower than the lower edge of the water slag outlet pipe (501), while the lower edge of the short tube (502) is slightly higher than the lower edge of the water slag outlet pipe (501). ; The upper end of the short tube (502) is sealed and welded to the outer surface of the water slag outlet pipe (501) to form a sealed air chamber (509); a sealed air inlet (510) is provided on the short tube (502) and is connected to the external sealed air source (505); the lower valve body is a valve plate (506) that can cover the sealing lip ring (503), one end of which is rigidly connected to the rotating shaft (507), and the rotating shaft (507) is installed on the bearing seat (508). One end of the rotating shaft (507) passes through the wall of the pressure equalizing bin (4) and is connected to the driving device (504) outside the bin. The gap through which the rotating shaft (507) passes through the bin wall can be sealed by an air chamber sealing method.

11. The high pressure gasification furnace according to claim 10, characterized in that: The sealing lip ring (503) can be made of rubber or a flexible elastic material that meets the requirements.

12. The high pressure gasification furnace according to claim 1, characterized in that: A heat preservation gun (25) is provided on the furnace wall of the upper furnace (29).

13. The high pressure gasification furnace according to claim 1, wherein: A heat-insulating slag conveying pipe (2) is provided to connect the furnace body slag outlet (9) with the second pressure-keeping bin slag inlet (38), and is covered with a heat-insulating device (28) when necessary. The second pressure-keeping bin (3) is provided with an air outlet device (30) and an air inlet device (31).

14. The high pressure gasification furnace according to claim 13, wherein: A second water gun (44) is provided at one end of the heat-insulating slag conveying pipe (2) near the furnace body slag outlet (9) to replace the first water gun (32), and the slag water in the heat-insulating slag conveying pipe (2) can be conveyed by a slurry pump and a slurry pump conveying pipeline, a built-in bucket elevator, or a gas conveying method, and the heat-insulating device (28) is eliminated.

15. The high pressure gasification furnace according to claim 1, wherein: A slag ditch (49) is provided behind the second water slag outlet (40) and is connected to the slag pool (50).

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