Gasification furnace suitable for tar gasification
By adopting a multi-layer brick structure and compressible polystyrene plate design in the tar gasification furnace, the problem of ultra-temperature and high pressure is solved, and the long-term use of the equipment and the improvement of wear resistance is achieved.
Patent Information
- Application Number
- CN202420361413.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-27
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-02-27
AI Technical Summary
Existing tar gasifiers are prone to overtemperature under high temperature and high pressure, resulting in abrasion and erosion of the furnace wall, affecting the long-term use of the equipment.
A multi-layer brick structure including inside and outside the furnace body is designed, using corundum bricks, hollow alumina ball bricks and aluminum bricks as hot surface bricks, backing bricks and insulation bricks, and compressible polystyrene is installed at the brick joints. The plates are connected using mud to form a sealing layer that is resistant to abrasion and erosion.
It effectively avoids the furnace wall temperature of the gasifier, extends the service cycle of the equipment, and improves the wear resistance.
Smart Images
Figure CN222160082U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a gasifier, more specifically, to a gasifier suitable for tar gasification, belonging to the field of gasifiers. Background Art
[0002] The byproducts of the device, such as catalytic oil slurry, ethylene tar, and styrene tar and phenol tar, which are hazardous wastes, have low utilization rates and poor product deep processing value. Mixing several oils and gasifying them with pure oxygen under high temperature and high pressure can produce hydrogen and synthesis gas required by downstream chemical plants, which solves the disposal of hazardous wastes and obtains clean product gas. In the process of gasification of mixed tar, due to the high temperature of 1500℃ and the high pressure of >6.0MPa, the wall temperature of the gasifier will be overheated, and the abrasion and erosion of the furnace bricks will increase under high temperature and high pressure. Utility Model Content
[0003] In order to solve the above-mentioned problems of the prior art, the utility model provides a gasifier suitable for tar gasification, which has the technical characteristics of ensuring that the gasifier does not overheat and can be used for a long period of time.
[0004] In order to achieve the above purpose, the utility model is implemented by the following technical solutions:
[0005] A gasifier suitable for tar gasification comprises a furnace body, wherein the furnace body is provided with sealing layers formed by hot face bricks, backing bricks and heat insulation bricks from the inside to the outside, and a plastic layer is provided between the heat insulation bricks and the furnace wall of the gasifier; the hot face bricks are corundum bricks, the backing bricks are alumina hollow ball bricks, and the heat insulation bricks are aluminum bricks.
[0006] Preferably, the thickness of the thermal surface brick is 150 mm, the thickness of the backing brick is 85 mm, and the thickness of the insulation brick is 105 mm.
[0007] Preferably, the brick joints between the hot facing bricks and the backing bricks, and between the backing bricks and the insulation bricks are staggered.
[0008] Preferably, the plastic layer is a compressible polystyrene board.
[0009] Preferably, the hot surface bricks, backing bricks and insulation bricks are all connected by mud.
[0010] Beneficial effects: It has the technical characteristics of simple structure, wear and erosion resistance, long-term use, and can avoid overheating of the furnace wall of the gasifier. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a schematic diagram of the structure of the utility model. DETAILED DESCRIPTION
[0012] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments.
[0013] like Figure 1 The figure shows a specific embodiment of a gasifier suitable for tar gasification, which comprises a furnace body, wherein the furnace body is provided with a sealing layer formed by a hot face brick 1, a backing brick 2, and a heat insulating brick 3 from the inside to the outside, and a plastic layer 4 is provided between the heat insulating brick 3 and the furnace wall of the gasifier; the hot face brick 1 is a corundum brick, the backing brick 2 is an alumina hollow ball brick, and the heat insulating brick 3 is an aluminum brick. The multi-layer design is resistant to abrasion and erosion and can be used for a long period of time; the furnace wall temperature of the gasifier can be prevented from overheating.
[0014] The tar gasifier consists of a gasification chamber and a washing and cooling chamber. The nominal operating pressure of the gasification chamber is 6.5MPa(G), and the gasification temperature is 1450℃. The pressure of the washing and cooling chamber is the same as that of the gasification chamber, and the operating temperature is 252℃. The oxygen purity from the air separation is 99.8%, 25℃, 8.00MPa(G). The oxygen is preheated and directly mixed with high-pressure steam (350℃, 8.50MPa(G)) to a temperature of 225℃ before entering the gasification chamber. The mixed tar at 90℃ and 7.88MPa(G) is fed into the gasification chamber by the tar feed pump.
[0015] The gasification chamber is an entrained flow reactor for gasification and combustion reactions. The metal shell withstands a gasification pressure of 6.5MPa and is made of 11 / 4Cr-1 / 2Mo (SA387 Gr11 Cl2). The metal shell is covered with surface thermocouples to detect the surface temperature. Thermocouples are set around the burner chamber, and a circle of surface thermocouples is set on the flange connecting the top of the gasifier and the metal shell. The temperature resistance of the gasification chamber is assisted by refractory brick lining.
[0016] Since the ash content in the mixed tar is extremely low, the erosion of refractory bricks is small. At the same time, since the mixed tar contains metal elements such as nickel, it will penetrate and corrode high-chrome bricks under high temperature and high pressure environment, and the furnace bricks will peel off after a long time. Therefore, the fire-facing surface, that is, the first layer of furnace bricks, is selected with high corrosion resistance. The other two layers are selected as alumina hollow ball bricks and high-aluminum lightweight bricks. Plastic is used between the high-aluminum lightweight bricks and the furnace wall.
[0017] When laying bricks in the gasifier, the mortar joints should be no larger than 2mm, the upper and lower layers and the inner and outer layers of bricks on each layer should be staggered, and the plastic should be evenly applied on the inner surface of the furnace shell. The mortar for laying the three types of bricks is preferably the mortar with a chemical composition similar to that of the corresponding bricks.
[0018] A specific optimization can be made for the properties of each brick in this application, see typical values for details:
[0019] Table 1. (High purity) corundum brick physical and chemical properties
[0020]
[0021] Table 2. Physical and chemical properties of alumina hollow ball bricks
[0022]
[0023]
[0024] Table 3. Physical and chemical properties of (high-aluminum lightweight) aluminum bricks
[0025]
[0026] Table 4. Physical and chemical properties of plastic layer
[0027]
[0028] In a preferred embodiment, the thickness of the thermal face brick 1 is 150 mm, the thickness of the backing brick 2 is 85 mm, and the thickness of the thermal insulation brick 3 is 105 mm.
[0029]
[0030]
[0031] In a preferred embodiment, the brick joints between the hot facing bricks 1 and the backing bricks 2 and between the backing bricks 2 and the insulation bricks 3 are staggered.
[0032] In a preferred embodiment, the plastic layer 4 is a compressible polystyrene board.
[0033] In a preferred embodiment, the 1 hot facing brick, the 2 backing bricks and the 3 insulating bricks are all connected by mud.
[0034] Finally, it should be noted that the present invention is not limited to the above embodiments, and there are many variations. All variations that can be directly derived or associated with the content disclosed by ordinary technicians in this field should be considered as the protection scope of the present invention.
Claims
1. A gasifier suitable for tar gasification, comprising a furnace body, characterized in that: From the inside to the outside, the furnace body is provided with a sealing layer formed by a hot face brick (1), a backing brick (2), and a heat insulating brick (3), and a plastic layer (4) is provided between the heat insulating brick (3) and the furnace wall of the gasifier; the hot face brick (1) is a corundum brick, the backing brick (2) is an alumina hollow ball brick, and the heat insulating brick (3) is an aluminum brick.
2. A gasifier suitable for tar gasification according to claim 1, characterized in that: The thickness of the heating surface brick (1) is 150 mm, the thickness of the backing brick (2) is 85 mm, and the thickness of the heat insulating brick (3) is 105 mm.
3. A gasifier suitable for tar gasification according to claim 1, characterized in that: The brick joints between the hot surface bricks (1) and the backing bricks (2) and between the backing bricks (2) and the heat insulation bricks (3) are staggered.
4. A gasifier suitable for tar gasification according to claim 1, characterized in that: The plastic layer (4) is a compressible polystyrene board.
5. The gasifier suitable for tar gasification according to claim 1, characterized in that: The hot surface bricks (1), the backing bricks (2) and the heat insulation bricks (3) are all connected by mud.