Biomass pure oxygen continuous gasification device with reforming section

Abstract

The utility model relates to a biomass pure oxygen continuous gasification device with a reforming section, and belongs to the fields of biomass comprehensive utilization, biomass gasification, raw material gas reforming, environmental protection treatment and the like. The system mainly comprises a feeding device, a gasification device and a reforming device, the feeding device is formed in a way that a feeding gate valve and a feeding upper ball valve are arranged below a hopper, an outlet of the upper ball valve is connected with the upper part of a spiral pusher, and a feeding lower ball valve and an in-furnace articulated chute are arranged at the lower part of the spiral pusher; the gasification device is characterized in that the upper part of a gasification furnace is an upper seal head, the center of the upper seal head is a feed port, and manholes, a radar level meter and a gas outlet pipe are arranged around the feed port; an upper jacket is connected to the lower part of the upper sealing head, is in a double-barrel form and forms a thermodynamic cycle with an upper jacket steam pocket, and a byproduct is low-pressure saturated steam. The device provides chemical feed gas for industrial enterprises, and solves the problems that biomass is difficult to dispose, occupies land, pollutes the environment and the like.

Description

Technical Field

[0001] The utility model relates to a biomass pure oxygen continuous gasification device with a reforming section, belonging to the fields of biomass comprehensive utilization, biomass gasification, raw gas reforming, environmental protection management, etc. Background Art

[0002] Biomass straw, waste wood, sawdust, etc. are very good fuels, but direct combustion will still produce some harmful substances, there are certain environmental problems, and their value has not been fully explored. At present, many companies want to use biomass to produce chemical raw gas, and the national industrial policy also encourages and supports this. For this reason, we decided to develop a biomass pure oxygen gasifier with a reforming section to produce clean gas to improve the comprehensive value of biomass. Clean gas can be used to produce chemical products, which can greatly reduce the use of fossil energy and contribute to the country's carbon peak by 2030 and carbon neutrality by 2060. Utility Model Content

[0003] The purpose of the utility model is to improve the comprehensive utilization value of biomass straw, waste wood, sawdust, etc., to provide chemical raw material gas for industrial enterprises, and to solve the problems of biomass being difficult to dispose of, occupying land, and polluting the environment.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A biomass pure oxygen continuous gasification device with a reforming section, comprising a feeding device, a gasification device and a reforming device;

[0006] The feeding device is composed of: a feeding gate valve and a feeding upper ball valve are arranged under the hopper, the outlet of the upper ball valve is connected to the upper part of the screw pusher, and the lower part of the screw pusher is provided with a feeding lower ball valve and a furnace chute;

[0007] The gasification device is composed of: the upper part of the gasification furnace is an upper head, the center of the upper head is a feeding port, and a manhole, a radar level meter and a gas outlet pipe are arranged around the feeding port;

[0008] The upper head is connected to the upper jacket at the bottom. The upper jacket is a double-cylinder form, which forms a thermal cycle with the upper jacket steam drum and produces low-pressure saturated steam as a by-product.

[0009] The lower part of the upper jacket is connected to the lower jacket. The lower jacket is a multi-header and multi-channel type, forming a thermal cycle with the steam drum of the lower jacket and producing medium-pressure saturated steam as a by-product.

[0010] The composition of the reforming device is as follows: a gas reforming device is arranged on the upper part of the biomass gasifier, and the gas comes out of the gasifier and enters the bottom of the reforming device through the connecting pipe;

[0011] The reformer is provided with a plurality of supporting legs externally, and the supporting legs are suspended from the crossbeam;

[0012] The entire reforming device includes an upper head, a lower head, a furnace body, and high-temperature castables;

[0013] The upper and lower heads have central openings, and are respectively provided with a gas outlet pipe and a gas inlet pipe. The gas outlet pipe is provided with a reforming outlet thermometer, and the gas inlet pipe is provided with a gasifier outlet thermometer;

[0014] An upper reforming burner and a lower reforming burner are arranged at the lower middle part of the cylinder of the reforming device.

[0015] Furthermore, in the feeding device: the biomass raw material enters the gasifier furnace from the hopper through the feeding gate valve, the feeding upper ball valve, the screw pusher, the feeding lower ball valve, and the furnace chute in sequence;

[0016] An inert gas filling valve and an inert gas discharge valve are arranged on the cylinder of the screw pusher.

[0017] Furthermore, in the feeding device: the furnace chute is designed to have an inclination angle of 50 to 60 degrees to ensure smooth entry of biomass into the furnace.

[0018] Furthermore, in the gasification device: the coal gas outlet pipe is a gasification and reforming connecting pipe.

[0019] Furthermore, in the gasification device: dense rivets are welded on the inner wall of the upper head and high-temperature castable is built.

[0020] Furthermore, in the gasification device: a water inlet is arranged at the lower part of the upper jacket, a steam-water outlet is arranged at the upper part of the upper jacket, and 4 to 6 supporting legs are arranged at the middle part of the upper jacket, and the supporting legs are suspended on the crossbeam.

[0021] Furthermore, in the gasification device: a water inlet is provided at the lower part of the lower jacket, a steam-water outlet is provided at the upper part of the lower jacket, and an upper thermometer of the gasifier, a middle thermometer of the gasifier, and a lower thermometer of the gasifier are also provided on the lower jacket;

[0022] The lower part of the lower jacket is connected to the furnace bottom assembly. The outside of the furnace bottom assembly is a vertical ash box and a furnace bottom shell, and the inside is an ash pan, an ash plow, a large gear ring, upper and lower slideways, and ball bearing components;

[0023] A gasifying agent distributor is installed on the ash tray, and the gasifying agent distributor is a multi-layer multi-channel structure;

[0024] The side of the furnace bottom assembly is provided with a grate motor and a reducer, which drive the grate motor and the reducer, and then drive the large gear ring, ash pan and gasifier distributor in sequence;

[0025] The lower part of the furnace bottom assembly is the central wind box, which includes a cylinder, a manhole, a gasifier inlet, a lower seat plate valve and a grate top thermometer; the gasifier enters the furnace bottom assembly from the gasifier inlet of the central wind box, and through the distribution of the gasifier distributor, the gasifier rises evenly along the axial direction of the gasifier to exchange heat with the ash, the ash is cooled, and the ash itself is preheated, and then enters the gasification layer to undergo redox reaction with the biomass raw materials;

[0026] A left ash box and a right ash box are arranged on both sides of the furnace bottom assembly. The left ash box or the right ash box includes a cylinder, an upper seat plate valve, a lower seat plate valve, an ash box manhole, a valve seat flushing nozzle, and a steam displacement valve.

[0027] Furthermore, in the gasification device:

[0028] The ash in the furnace is crushed by the gasifier distributor and the ash plow and enters the left ash box and the right ash box. When the storage volume reaches 70-80%, it is first converted with steam, and then the upper seat plate valve seat is flushed with water, the upper seat plate valve is closed, the lower seat plate valve is opened, and the ash is placed in the transport vehicle; after confirming that it is completely discharged, the lower seat plate valve is closed, and the lower seat plate valve is opened.

[0029] Furthermore, in the reforming device:

[0030] Rivets are welded on the inner wall of the reformer to ensure pouring adhesion.

[0031] Furthermore, in the reforming device:

[0032] The upper reforming burners or the lower reforming burners are arranged in 4 to 8 pieces respectively;

[0033] The upper reforming burner or the lower reforming burner is evenly distributed in a circular pattern in the radial direction and forms an angle of 60° with the tower wall in the horizontal direction;

[0034] The upper reforming burner and the lower reforming burner are spaced 1 to 2 meters apart. The device is also equipped with an upper reforming device thermometer, a middle reforming device thermometer, and a lower reforming device thermometer to measure the temperature in the furnace.

[0035] Natural gas is passed through the center of the upper reforming burner and the lower reforming burner, and oxygen is passed through the annular gap; by adding oxygen, the furnace temperature is raised to 850-950°C, causing the tar and other organic macromolecules in the coal gas to crack.

[0036] This process technology has the following characteristics:

[0037] 1. Multiple biomass briquetting machines and rod making machines press the crushed biomass into small pieces (40-80mm) or rods (Φ10-30mm) with certain strength and not easy to loosen. The self-developed device has the characteristics of tight briquetting, low power consumption, less dust, and labor saving.

[0038] 2. In order to make the biomass enter the gasification furnace smoothly, our company has developed a new automatic feeding device (feed lock) to adapt to the poor fluidity of biomass blocks or sticks. The automatic feeder is equipped with a feeding gate valve, a feeding upper ball valve, a screw pusher, and a feeding lower ball valve. The furnace chute is designed with a large inclination angle (50-60°) to prevent the biomass from getting stuck. The biomass blocks or sticks are added to the biomass gasification furnace in a timely and quantitative manner controlled by a computer.

[0039] 3. When the automatic feeding device is automatically feeding, in order to prevent the gas from entering the inner tube of the feeding tube, causing safety hazards and gas waste, this process is designed with an inert gas filling valve and an inert gas discharge valve.

[0040] Inert gas charging procedure: open the charging upper ball valve and check that the valve is in place → open the feeding gate valve → the raw material enters the inner tube of the screw pusher → close the feeding gate valve → close the charging upper ball device → fill the inner tube of the screw pusher with inert gas so that its pressure is slightly greater than the pressure in the gasifier furnace → close the inert gas charging valve, open the charging lower ball device and the screw pusher to feed the gasifier → delay for 5 to 7 seconds → close the charging lower ball device and the screw pusher → open the inert gas discharge valve until the pressure in the screw pusher tube is basically zero → close the inert gas discharge valve → enter the next charging cycle after about 2 to 4 minutes.

[0041] 4. This process designs the gasifier into a cold fireplace, which adopts a double-jacket structure. The upper jacket is a double-cylinder form, forming a thermal cycle with the upper jacket steam drum, and producing low-pressure saturated steam as a by-product; the lower jacket is a multi-header multi-channel form, forming a thermal cycle with the lower jacket steam drum, and producing medium-pressure saturated steam as a by-product. The steam produced by the upper and lower jackets is all used by the gasifier, and no external steam supply is required.

[0042] 5. According to the characteristics of biomass gasification, a multi-layer and multi-channel gasifier distributor is developed. The distributor is installed on the ash tray and driven by a worm gear mechanism to ensure that the gasifier fully exchanges heat with the ash and slag, and at the same time ensures that the gasifier rises evenly along the axial direction of the gasifier into the gasification layer. The gasifier distributor also has a strong slag breaking function. As the distributor rotates, large pieces of ash and slag are crushed by the slag breaking horns on the distributor, move down into the ash and slag area, exchange heat with the gasifier in the ash and slag area, and finally fall into the ash boxes on both sides of the furnace bottom.

[0043] 6. New ash boxes are installed on both sides of the lower part of the gasifier, and self-developed double seat plate valves with good sealing performance are installed inside to achieve ash unloading without stopping the furnace. Water flushing nozzles are installed on the valve seats of the upper and lower seat plate valves to prevent ash stagnation and affect the sealing. The ash boxes on both sides are also equipped with steam replacement automatic quick-opening valves to prevent gas from overflowing during ash unloading and ensure ash unloading safety.

[0044] Slag discharge procedure: open the steam replacement quick-opening valve → fill with steam for about 10 to 15 seconds → open the upper seat plate valve and flush the valve seat for about 5 to 10 seconds → close the upper seat plate valve → open the lower seat plate valve after the upper seat plate valve inspection shows that it is fully closed → wait for the ash and slag to be unloaded → open the lower valve seat and flush the water for about 5 to 10 seconds → close the lower seat plate valve → open the upper seat plate valve after the lower seat plate valve inspection shows that it is fully closed → carry out the next round of ash and slag discharge work after 4 to 8 hours.

[0045] 7. After the biomass blocks or rods enter the gasifier from the automatic feeder, they pass through the drying layer and the retorting layer from top to bottom, and then enter the gasification layer. At a high temperature of 1000-1200℃, the redox reaction occurs with the gasifying agent from the ash layer to produce coal gas rich in carbon monoxide and hydrogen. The coal gas passes through the retorting layer and the drying layer upwards in turn, exchanging heat with the biomass raw materials, the coal gas is cooled, the raw materials are preheated, and some unreacted water vapor, tar and other organic macromolecules are entrained.

[0046] 8. When using biomass to make coal gas, some organic macromolecules such as tar will be produced in the low temperature zone (drying and retorting zone). These substances are taken out of the furnace with the coal gas. For this reason, this process designs a reforming section, which sprays a small amount of natural gas and oxygen at multiple layers and multiple points to make the temperature of the reforming section reach 850-950℃. The tar and other organic macromolecules in the coal gas are cracked and reformed at this high temperature to generate small molecules that can be used in chemical production. The reforming section is placed on the upper part of the gasifier, and the coal gas enters from the bottom and exits from the top. There are multiple layers of reforming burners at the bottom of the reforming section, with 4 to 8 burners per layer.

[0047] 9. After the biomass blocks or rods are gasified, the ash in them will form solid slag, and the residual carbon in the slag is ≤0.1%. The main component of the slag is potassium carbonate, which can be used as agricultural potash fertilizer.

[0048] 10. The gas produced by this technology has high effective components, and after reforming, CO+H 2 ≥64%, tar and other organic macromolecules ≤0.1%.

[0049] 11. Clean and friendly, no noise, no wastewater or exhaust emissions.

[0050] 12. The biomass gasification device operates stably and reliably with low maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0053] A biomass pure oxygen continuous gasification device with a reforming section, characterized in that it comprises a feeding device, a gasification device and a reforming device;

[0054] The feeding device is composed of: a feeding gate valve 53 and a feeding upper ball valve 52 are provided under the hopper 54, the outlet of the upper ball valve 52 is connected to the upper part of the screw pusher 51, and the lower part of the screw pusher 51 is provided with a feeding lower ball valve 50 and a furnace chute 49;

[0055] The gasification device is composed of: the upper part of the gasification furnace is a first upper end cap 15, the center of the first upper end cap 15 is a feed port 48, and a manhole, a radar level meter 47 and a gas inlet pipe 13 are arranged around the feed port 48;

[0056] The first upper head 15 is connected to the upper jacket 44 at the bottom. The upper jacket 44 is in the form of a double cylinder and forms a thermal cycle with the upper jacket steam drum to produce low-pressure saturated steam as a by-product.

[0057] The lower part of the upper jacket 44 is connected to the lower jacket 40. The lower jacket 40 is in the form of multiple headers and multiple flow channels, and forms a thermodynamic cycle with the steam drum of the lower jacket, and produces medium-pressure saturated steam as a by-product.

[0058] The composition of the reforming device is as follows: a gas reforming device is arranged on the upper part of the biomass gasifier, and the gas comes out of the gasifier and enters the bottom of the reforming device through the connecting pipe 13;

[0059] The reforming device is provided with a plurality of first supporting legs 55 externally, and the first supporting legs 55 are suspended on the crossbeam;

[0060] The entire reforming device includes a second upper head 2, a lower head 12, a furnace body 8, and a first high-temperature castable;

[0061] The second upper end cap 2 and the lower end cap 12 have central openings, and are respectively provided with a gas outlet pipe 57 and a gas inlet pipe 13. The gas outlet pipe 57 is provided with a reforming outlet thermometer 1, and the gas inlet pipe 13 is provided with a gasifier outlet thermometer 14;

[0062] An upper reforming burner 9 and a lower reforming burner 11 are provided in the lower middle part of the cylinder of the reforming device.

[0063] Furthermore, in the feeding device: the biomass raw material enters the gasifier furnace 41 from the hopper 54 through the feeding gate valve 53, the feeding upper ball valve 52, the screw pusher 51, the feeding lower ball valve 50, and the furnace chute 49 in sequence;

[0064] The cylinder of the screw pusher 51 is provided with an inert gas filling valve and an inert gas discharge valve.

[0065] Furthermore, in the feeding device, the furnace chute 49 is designed to have an inclination angle of 50 to 60 degrees to ensure smooth entry of biomass into the furnace.

[0066] Furthermore, in the gasification device: the coal gas outlet pipe 13 is a pipe connecting gasification and reforming.

[0067] Furthermore, in the gasification device: dense rivets are welded on the inner wall of the first upper head 15, and a second high-temperature castable 46 is built.

[0068] Furthermore, in the gasification device: a first water inlet 43 is provided at the lower portion of the upper jacket 44, a first steam-water outlet 16 is provided at the upper portion of the upper jacket 44, 4 to 6 second supporting legs 17 are provided at the middle portion of the upper jacket 44, and the second supporting legs 17 are suspended on the crossbeam.

[0069] Furthermore, in the gasification device: the lower part of the lower jacket 40 is provided with a second water inlet 23, the upper part of the lower jacket 40 is provided with a second steam-water outlet 18, and the lower jacket 40 is also provided with a gasifier upper thermometer 19, a gasifier middle thermometer 21, and a gasifier lower thermometer 22;

[0070] The lower part of the lower jacket 40 is connected to the furnace bottom assembly 25. The furnace bottom assembly 25 has an upright ash box and a furnace bottom shell on the outside, and an ash pan, an ash plow, a large gear ring, upper and lower slideways, and ball bearing components on the inside.

[0071] A gasifying agent distributor 39 is installed above the ash tray, and the gasifying agent distributor 39 is a multi-layer multi-channel structure;

[0072] A grate motor and a reducer 24 are arranged on the side of the furnace bottom assembly 25, and the grate motor and the reducer 24 drive the grate 26, and then sequentially drive the large gear ring, the ash pan and the gasifier distributor 39;

[0073] The lower part of the furnace bottom assembly is a central wind box 28, which includes a cylinder, a manhole 29, a gasifying agent inlet 36, a first lower seat plate valve 31 and a grate top thermometer 27; the gasifying agent enters the furnace bottom assembly 25 from the gasifying agent inlet 36 of the central wind box 28, and is distributed by the gasifying agent distributor 39. The gasifying agent rises uniformly along the axial direction of the gasifier to exchange heat with the ash, the ash is cooled, and the ash itself is preheated, and then enters the gasification layer to undergo oxidation-reduction reaction with the biomass raw material;

[0074] A left ash box 34 and a right ash box 30 are arranged on both sides of the furnace bottom assembly 25. The left ash box 34 or the right ash box 30 includes a cylinder, an upper seat plate valve 38, a second lower seat plate valve 32, an ash box manhole 33, a valve seat flushing nozzle, and a steam replacement valve.

[0075] Furthermore, in the gasification device:

[0076] The ash in the furnace is crushed by the gasifier distributor 39 and the ash plow, and enters the left ash box 34 and the right ash box 30. When the storage volume reaches 70-80%, it is first converted with steam, and then the upper seat plate valve seat is flushed with water, the seat plate valve 38 is closed, and the second lower seat plate valve 32 is opened to put the ash into the transport vehicle; after confirming that it is completely discharged, the lower seat plate valve 38 is closed and the second lower seat plate valve 32 is opened.

[0077] Furthermore, in the reforming device:

[0078] Rivets 56 are welded on the inner wall of the reformer to ensure pouring adhesion.

[0079] Furthermore, in the reforming device:

[0080] The upper reforming burners 9 or the lower reforming burners 11 are arranged in 4 to 8 pieces respectively;

[0081] The upper reforming burner 9 or the lower reforming burner 11 is evenly distributed in a circular pattern in the radial direction and forms an angle of 60° with the tower wall in the horizontal direction;

[0082] The upper reforming burner 9 and the lower reforming burner 11 are spaced 1 to 2 meters apart from each other. The device is also provided with an upper reforming device thermometer 4, a middle reforming device thermometer 7, and a lower reforming device thermometer 10 for measuring the temperature in the furnace 6.

[0083] Natural gas is passed through the center of the upper reforming burner 9 and the lower reforming burner 11, and oxygen is passed through the annular gap; by increasing oxygen, the temperature of the furnace 6 is increased to 850-950°C, so that organic macromolecules such as tar in the coal gas are cracked.

[0084] Gasification process description

[0085] Biomass straw has low density, large transportation volume, large space occupation, and is easy to catch fire, so a larger site is required for stacking, and fire prevention measures must be taken. This project has set up multiple raw material warehouses according to different biomass raw materials, and each warehouse is separated by a firewall.

[0086] The collected biomass is picked up by a crane and transported to the crusher, where it is broken into pieces and transported to the top of a briquetting machine or a rod making machine by an inclined belt.

[0087] The crushed biomass raw materials enter the self-developed briquetting machine or rod making machine, and are mechanically squeezed into small pieces (40-80mm) or rods (Φ10-30mm) with a certain strength and not easy to loosen. The finished blocks or rods are transported to the raw material and finished product warehouse for classified storage.

[0088] The biomass blocks or rods in the raw material finished product warehouse are transferred to the ground bucket by the crane grab, and then transported to the horizontal belt on the fifth floor of the gasification plant by a high-angle belt. The horizontal belt is equipped with an automatic material separation knife gate, which intercepts the biomass blocks or rods into the gasifier top silo 54.

[0089] The biomass blocks or rods from the furnace top silo 54 are automatically fed into the gasifier in a fixed time and quantity by computer control through the feeding gate valve 53, the upper feeding ball valve 52, the screw pusher 51 and the lower feeding ball valve 50. Since the biomass blocks or rods have poor fluidity, the development of the automatic feeder and the size and inclination angle of the furnace chute 49 fully consider the characteristics of the raw materials.

[0090] When the automatic feeding device is feeding, in order to prevent the gas from entering the feeding inner cylinder, causing safety hazards and gas waste, this process is designed with an inert gas filling valve and an inert gas discharge valve. Before the raw materials enter the furnace, the pressure in the screw pusher 51 cylinder is filled with inert gas (carbon dioxide or nitrogen) to a pressure slightly higher than the pressure in the gasifier furnace 41.

[0091] The biomass blocks or rods added to the furnace pass through the drying layer and the retorting layer from top to bottom, and enter the gasification layer in the middle. They undergo an oxidation-reduction reaction with the gasifying agent from the ash layer at a high temperature of 1000-1200°C to produce coal gas rich in carbon monoxide and hydrogen. The coal gas passes through the retorting layer and the drying layer upwards in turn, exchanging heat with the biomass raw materials. The raw materials are heated, dried and retorted, while the coal gas is cooled. The tar and other organic macromolecules coming out of the drying and retorting layers will be entrained out of the gasifier along with the coal gas. The coal gas coming out of the furnace at 250-350°C is sent to the reforming device at the top of the gasifier.

[0092] The air separation section provides pure oxygen gasifier (≥99.6%) for biomass gasification, and the steam produced by the upper and lower jackets of the gasifier provides another gasifier for biomass gasification. The two gasifiers are mixed in a mixed fire-retardant tank according to a certain ratio after metering and flow adjustment, and enter the central wind box 28 at the bottom of the gasifier at a temperature of about 200°C. After passing through the new special gasifier distributor 39, it enters the ash layer in multiple levels and channels to exchange heat with the hot ash, the sensible heat of the ash is recovered, and the gasifier is preheated. The gasifier out of the ash layer rises into the gasification layer (redox layer), and undergoes a gasification reaction with the biomass raw material under this high temperature condition.

[0093] After the biomass is gasified, it will become high-temperature ash. As the gasifier distributor (grate) 39 rotates, the large ash is crushed by the slag-breaking horns on the distributor and moves down into the ash area, where it exchanges heat with the gasifier and finally falls into the left ash box 34 and the right ash box 30 on both sides of the furnace bottom. The ash is discharged every 4 to 8 hours.

[0094] The coal gas from the biomass gasifier carries a small amount of organic macromolecules such as tar and a small amount of water vapor that has not been completely reacted. The produced coal gas enters the furnace 6 from the bottom of the reforming section through the connecting pipe 13. Under the high temperature condition (850-950℃) in the furnace 6, the organic macromolecules such as tar are cracked and reformed to produce CO and H 2 The gases such as tar are converted into inorganic small molecules that can be used in chemical production. The total amount of coal gas after cracking will increase. The high-temperature coal gas that comes out of the top pipe 57 of the reforming section and contains almost no organic macromolecules such as tar is sent to the steam superheater and sensible heat recovery device, where it is heat exchanged and cooled, and then sent to the desulfurization section. The medium-pressure steam produced by the sensible heat recovery device is sent out.

[0095] A plurality of reforming burners (9, 11) are arranged in the lower part of the reforming section, with a spacing of 1 to 2 m. The burners in each layer are evenly distributed in a circular pattern in the radial direction and form an angle of 60° with the tower wall in the horizontal direction. This design can effectively enable the combustion airflow to drive the coal gas to swirl and mix in the cracking hall, so that it is heated evenly, thereby achieving the purpose of fully cracking the heavy components.

[0096] Natural gas is passed through the center of the reforming burner, and oxygen is passed through the annular gap. Two streams of gas are ejected from the top of the burner to form a high-speed flame jet. In the early stage of cracking and reforming, in order to quickly raise the temperature in the reforming chamber, a larger natural gas and oxygen flow rate can be used. As the temperature in the chamber rises, the natural gas and oxygen flow rates can be gradually reduced. When the temperature in the chamber reaches the process requirements, the oxygen flow rate is fixed, and the natural gas flow rate is gradually reduced. Depending on the situation, it can also be stopped. At this time, the temperature in the chamber can be maintained by burning oxygen and a small amount of coal gas. Under normal production conditions, the oxygen flow rate is determined by the amount of coal gas, the temperature in the chamber, and the quality of the exported coal gas (cracking reforming degree).

[0097] In order to protect the gasifier from being burned at a relatively high gasification temperature and to prevent the raw materials from sintering and hanging on the wall at high temperature, this process designs the gasifier into a cold fireplace, that is, desalted water is used for circulation and cooling. This cold fireplace adopts a double-jacket structure. The upper jacket 44 is in the form of a double cylinder, forming a thermal cycle with the upper jacket steam drum, and producing low-pressure saturated steam as a by-product; the lower jacket 40 is in the form of a multi-header and multi-channel, forming a thermal cycle with the lower jacket steam drum, and producing medium-pressure saturated steam as a by-product. The steam produced by the upper and lower jackets is superheated to 260-300°C by high-temperature coal gas and then sent to the steam buffer tank to be used as a gasifying agent for the gasifier. Under normal production conditions, the steam produced by the gasifier can be self-sufficient without external steam supply.

[0098] In all the schemes mentioned above, the connection between two parts can be selected according to actual conditions by welding, matching connection of bolts and nuts, bolt or screw connection or other well-known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is given priority. The above is only a preferred specific implementation method of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, according to the technical scheme of the utility model and its utility model concept, shall be covered by the protection scope of the utility model.

Claims

1. A biomass pure oxygen continuous gasification device with a reforming section, characterized in that: It includes a charging device, a gasification device and a reforming device; The feeding device is composed of: a feeding gate valve (53) and a feeding upper ball valve (52) are arranged below the hopper (54); the outlet of the upper ball valve (52) is connected to the upper part of the screw pusher (51); and a feeding lower ball valve (50) and a furnace chute (49) are arranged below the screw pusher (51); The gasification device is composed of: the upper part of the gasification furnace is a first upper end cap (15), the center of the first upper end cap (15) is a feed port (48), and a manhole, a radar level meter (47) and a gas inlet pipe (13) are arranged around the feed port (48); The first upper head (15) is connected to the upper jacket (44) at the bottom. The upper jacket (44) is in the form of a double cylinder and forms a thermodynamic cycle with the upper jacket steam drum to produce low-pressure saturated steam as a by-product. The lower part of the upper jacket (44) is connected to the lower jacket (40), and the lower jacket (40) is a multi-header multi-channel type, forming a thermodynamic cycle with the steam drum of the lower jacket, and producing medium-pressure saturated steam as a by-product; The composition of the reforming device is as follows: a gas reforming device is arranged on the upper part of the biomass gasifier, and the gas comes out of the gasifier and enters the bottom of the reforming device through the connecting pipe; The reforming device is externally provided with a plurality of first supporting legs (55), and the first supporting legs (55) are suspended on the crossbeam; The entire reforming device comprises a second upper end cover (2), a lower end cover (12), a furnace body (8), and a first high-temperature castable (5); The second upper end cap (2) and the lower end cap (12) have central openings, and are respectively provided with a coal gas outlet pipe (57) and a coal gas inlet pipe (13); the coal gas outlet pipe (57) is provided with a reforming outlet thermometer (1), and the coal gas inlet pipe (13) is provided with a gasifier outlet thermometer (14); An upper reforming burner (9) and a lower reforming burner (11) are arranged at the lower middle portion of the cylinder of the reforming device.

2. The biomass pure oxygen continuous gasification device with a reforming section according to claim 1, characterized in that: In the feeding device, the biomass raw material enters the gasification furnace hall (41) from the hopper (54) through the feeding gate valve (53), the feeding upper ball valve (52), the screw pusher (51), the feeding lower ball valve (50), and the furnace chute (49); An inert gas filling valve and an inert gas discharge valve are provided on the cylinder of the screw pusher (51).

3. The biomass pure oxygen continuous gasification device with a reforming section according to claim 2, characterized in that: In the charging device, the furnace chute (49) is designed to have an inclination angle of 50 to 60 degrees to ensure smooth entry of biomass into the furnace.

4. The biomass pure oxygen continuous gasification device with a reforming section according to claim 1, characterized in that: In the gasification device: the coal gas inlet pipe (13) is a pipe connecting gasification and reforming.

5. The biomass pure oxygen continuous gasification device with a reforming section according to claim 1, characterized in that: In the gasification device: the inner wall of the first upper head (15) is welded with dense rivets and is built with a second high-temperature castable (46).

6. The biomass pure oxygen continuous gasification device with a reforming section according to claim 1, characterized in that: In the gasification device: a first water inlet (43) is arranged at the lower part of the upper jacket (44), a first soda outlet (16) is arranged at the upper part of the upper jacket (44), and 4 to 6 second supporting legs (17) are arranged at the middle part of the upper jacket (44), and the second supporting legs (17) are suspended on the crossbeam.

7. The biomass pure oxygen continuous gasification device with a reforming section according to claim 1, characterized in that: In the gasification device: the lower portion of the lower jacket (40) is provided with a second water inlet (23), the upper portion of the lower jacket (40) is provided with a second steam-water outlet (18), and the lower jacket (40) is also provided with a gasifier upper thermometer (19), a gasifier middle thermometer (21), and a gasifier lower thermometer (22); The lower part of the lower jacket (40) is connected to the furnace bottom assembly (25), the furnace bottom assembly (25) has an upright ash box and a furnace bottom shell on the outside, and an ash pan, an ash plow, a large gear ring, upper and lower slideways, and ball bearing components on the inside; A gasifying agent distributor (39) is installed above the ash tray, and the gasifying agent distributor (39) is a multi-layer multi-channel structure; A grate machine motor and a reducer (24) are arranged on the side of the furnace bottom assembly (25), and the grate machine motor and the reducer (24) drive the grate machine (26), and then sequentially drive the large gear ring, the ash pan and the gasifying agent distributor (39); The lower part of the furnace bottom assembly is a central wind box (28), which includes a cylinder, a manhole (29), a gasifying agent inlet (36), a first lower seat plate valve (31) and a grate top thermometer (27); the gasifying agent enters the furnace bottom assembly (25) from the gasifying agent inlet (36) of the central wind box (28), and is distributed by the gasifying agent distributor (39). The gasifying agent rises uniformly along the axial direction of the gasifier to exchange heat with the ash, so that the ash is cooled and the ash itself is preheated, and then enters the gasification layer to undergo a redox reaction with the biomass raw material; A left ash box (34) and a right ash box (30) are arranged on both sides of the furnace bottom assembly (25). The left ash box (34) or the right ash box (30) comprises a cylinder, an upper seat plate valve (38), a second lower seat plate valve (32), an ash box manhole (33), a valve seat flushing nozzle, and a steam replacement valve.

8. The biomass pure oxygen continuous gasification device with a reforming section according to claim 7, characterized in that: In the gasification device: The ash in the furnace is crushed by the gasifier distributor (39) and the ash plow, and enters the left ash box (34) and the right ash box (30). When the storage volume reaches 70 to 80%, it is first converted with steam, and then the upper seat plate valve seat is flushed with water, and the upper seat plate valve (38) and the second lower seat plate valve (32) are closed, and the ash is placed in the transport vehicle; after it is determined that the ash is completely discharged, the upper seat plate valve (38) and the second lower seat plate valve (32) are closed.

9. The biomass pure oxygen continuous gasification device with a reforming section according to claim 1, characterized in that: In the reforming device: Rivets (56) are welded on the inner wall of the reformer to ensure the pouring adhesion.

10. The biomass pure oxygen continuous gasification device with a reforming section according to claim 1, characterized in that: In the reforming device: The upper reforming burners (9) or the lower reforming burners (11) are arranged in 4 to 8 pieces respectively; The upper reforming burner (9) or the lower reforming burner (11) is evenly distributed in a circular pattern in the radial direction and forms an angle of 60° with the tower wall in the horizontal direction; The upper reforming burner (9) and the lower reforming burner (11) are spaced 1 to 2 meters apart from each other. The device is also provided with an upper reforming device thermometer (4), a middle reforming device thermometer (7), and a lower reforming device thermometer (10) for measuring the temperature in the furnace (6); The upper reforming burner (9) and the lower reforming burner (11) are connected to natural gas in the center and oxygen in the annular gap; by increasing oxygen, the temperature of the furnace (6) is increased to 850-950°C, so that organic macromolecules such as tar in the coal gas are cracked.

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