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CN-121993613-A - High-temperature flue valve

CN121993613ACN 121993613 ACN121993613 ACN 121993613ACN-121993613-A

Abstract

The invention discloses a high-temperature flue valve which comprises a valve plate and is characterized in that a hollow framework (1) is arranged in the valve plate, a cooling water channel is arranged in the hollow framework (1), a fireproof fiber block (2) is arranged on the hollow framework (1), a protective shell (3) is arranged outside the fireproof fiber block (2), and the valve plate is formed by the hollow framework (1), the fireproof fiber block (2) and the protective shell (3). Compared with the prior art, the invention does not need to greatly reduce the temperature of the integral valve or the valve plate, only maintains the relatively low temperature of the valve plate through the hollow framework, has simple structure and manufacture, lower implementation cost, high-efficiency and quick operation, stable service performance, long service life, extremely low water consumption, slight influence on the exhaust gas temperature and low operation and maintenance cost.

Inventors

  • CHEN NING
  • WEI ZHIYU
  • YANG DEGUANG
  • CHEN JIE
  • SHAO QI

Assignees

  • 贵阳铝镁设计研究院有限公司

Dates

Publication Date
20260508
Application Date
20260324

Claims (10)

  1. 1. The high-temperature flue valve comprises a valve plate and is characterized in that a hollow framework (1) is arranged in the valve plate, a cooling water channel is arranged in the hollow framework (1), a fireproof fiber block (2) is arranged on the hollow framework (1), a protective shell (3) is arranged outside the fireproof fiber block (2), and the valve plate is formed by the hollow framework (1), the fireproof fiber block (2) and the protective shell (3).
  2. 2. The high-temperature flue valve according to claim 1, wherein the hollow framework (1) comprises a water inlet pipe (11) and a water outlet pipe (18), an outer cylinder (12) and an inner cylinder (13) are arranged on the outer side of the hollow framework (1), a circular sealing plate (14) is connected between the outer cylinder (12) and the inner cylinder (13) to form an annular water channel, one end of a radial steel pipe (15) is connected in the annular water channel, the other end of the radial steel pipe (15) is connected to a central cylinder (16) in the middle of the hollow framework (1), and a sealing plate (17) is arranged on the central cylinder (16).
  3. 3. A high temperature flue valve according to claim 2, wherein the water inlet pipe (11) is arranged below the valve plate mounting position, and the water outlet pipe (18) is arranged above the valve plate mounting position, and cooling water enters and exits from the upper part.
  4. 4. A high-temperature flue valve according to claim 2, wherein the radial steel pipes (15) are uniformly arranged in the circumferential direction.
  5. 5. A high temperature flue valve according to claim 2 wherein the radial steel tube (15) has a diameter phi of 30-100mm and a wall thickness of 3-8mm.
  6. 6. A high temperature flue valve according to claim 2 wherein the central cylinder (16) has a diameter phi of 100-300mm, a wall thickness of 5-10mm, a width of 50-80mm and a wall thickness of 5-10mm.
  7. 7. The high-temperature flue valve according to claim 1, further comprising a valve seat, wherein a valve seat lining (4) is arranged in a valve seat shell (5) of the valve seat, a bearing (6) is arranged outside the valve seat shell (5), and the hollow framework (1) is rotationally connected with the valve seat through the bearing (6).
  8. 8. A high temperature flue valve according to claim 7, wherein the protective housing (3) is stainless steel or a titanium alloy.
  9. 9. The high-temperature flue valve according to claim 7, wherein the valve seat lining (4) is divided into an inner annular structure and an outer annular structure, the inner annular structure is a fireproof layer, and the outer annular structure is an insulating layer.
  10. 10. A high temperature flue valve according to claim 1, wherein the refractory fiber block (2) has a thickness of 200-500mm, a refractory fiber density of 160-300kg/cm 3 and a thermal conductivity of less than 0.2W/(m.k).

Description

High-temperature flue valve Technical Field The invention relates to a high-temperature flue valve, and belongs to the technical field of high-temperature resistant valves for flue gas regulation and control. Background At present, a great amount of high-temperature flue gas is generally generated in the carbon calcination production process, such as a carbon pot calciner, the temperature of the flue gas generally reaches 700-1200 ℃, and in order to adjust the thermal system in the calciner, a valve is required to be used downstream to control the flow rate and the negative pressure of the flue gas. The existing various high-temperature flue valves have the following defects that 1, the flue valve made of pure heat-resistant metal is high in price and easy to deform, 2, the flue valve made of pure refractory castable is heavy in structure and easy to break and inconvenient to install and replace, 3, the flue valve made of refractory castable is laid by adopting a heat-resistant metal framework, the thermal expansion of the framework and the castable is inconsistent, the castable breaks and falls off, 4, the flue valve made of pure refractory fiber blocks is not resistant to scouring and is easy to infiltrate volatile matters to burn to cause pulverization, 5, the flue valve made of the traditional water-cooled flue valve is required to use a large amount of water, and the flue gas temperature is reduced in a white way, so that the capability of subsequent heat utilization equipment (such as a heat exchanger, a waste heat boiler and the like) is insufficient. Obviously, the existing high temperature flue valves are not ideal enough. In the prior art, chinese patent CN108843795A discloses an ultra-high temperature butterfly valve with water cooling structure, through all set up wear-resisting thermal-insulated lining on the inner runner of valve body and on the surface of butterfly plate, the valve body cooling water runner that sets up in the cooperation valve body and through the valve rod water cooling mechanism of intaking and going out water, realize the water cooling to the inside of valve body and in the butterfly plate, the inside valve plate after the cooling is difficult for the valve plate to block owing to high temperature inflation, has protected the product, has increased the durability of product. However, the valve has the problems of high-temperature expansion and falling of the heat-resistant lining, large consumption of cooling water, large reduction of flue gas temperature and the like. In the prior art, chinese patent CN201373118Y discloses a high-temperature flue butterfly valve, which comprises a valve body, a valve rod, a valve plate and a bearing, wherein a heat-insulating lining with a sub-opening is arranged in the valve body, the valve plate can be tightly adhered to the sub-opening of the heat-insulating lining when the butterfly valve is closed, the sealing problem of the flue valve is solved, the bearing arranged on the valve body is isolated from high-temperature flue gas by the heat-insulating lining, the temperature of the valve body and the bearing is lower, the valve plate rotates flexibly, and the service life is long. However, the valve has the problems of high price of heat-resistant metal, expansion deformation of metal at high temperature, high bearing temperature blockage caused by heat conduction of valve rod, combustion damage of combustible matters such as tar and the like permeated into fibers, and the like. Disclosure of Invention The invention aims to provide the high-temperature flue valve which has the advantages of simple structure, low implementation cost, high efficiency and rapidness in operation, stable service performance, long service life, extremely low water consumption, slight influence on the exhaust gas temperature and low operation and maintenance cost. The invention relates to a high-temperature flue valve which comprises a valve plate, wherein a hollow framework is arranged in the valve plate, a cooling water channel is arranged in the hollow framework, a fireproof fiber block is arranged on the hollow framework, a protective shell is arranged outside the fireproof fiber block, and the valve plate is formed by the hollow framework, the fireproof fiber block and the protective shell. The hollow framework comprises a water inlet pipe and a water outlet pipe, an outer cylinder and an inner cylinder are arranged on the outer side of the hollow framework, a circular sealing plate is connected between the outer cylinder and the inner cylinder to form an annular water channel, one end of a radial steel pipe is connected in the annular water channel, the other end of the radial steel pipe is connected to a central cylinder in the middle of the hollow framework, and a sealing plate is arranged on the central cylinder. The inlet pipe is arranged below the valve plate mounting position, the outlet pipe is arranged above the valve plate mounting position, a