CN-224227098-U - Wear-resisting anti-deformation pulverized coal spray gun

CN224227098UCN 224227098 UCN224227098 UCN 224227098UCN-224227098-U

Abstract

The utility model belongs to the technical field of pulverized coal injection devices, in particular to a wear-resistant and deformation-resistant pulverized coal injection gun, which comprises a high-temperature end gun barrel component, a low-temperature end steel pipe and a pulverized coal inlet wear-resistant steel pipe, wherein one end of the low-temperature end steel pipe is connected with the other end of the high-temperature end gun barrel component, the other end of the low-temperature end steel pipe is connected with one end of the pulverized coal inlet wear-resistant steel pipe, a cold end protection steel pipe is welded outside the joint of the low-temperature end steel pipe and the pulverized coal inlet wear-resistant steel pipe, the high-temperature end gun barrel component is formed by sleeving an inner composite ceramic steel pipe, a middle deformation-resistant steel pipe and an outer deformation-resistant steel pipe from inside to outside, the high-temperature end gun barrel component and the low-temperature end steel pipe are provided with high-temperature end protection steel pipes, and two vibration-resistant balls are welded outside the high-temperature end protection steel pipes.

Inventors

ZHANG JINFA
XU DONG
Jiang Kefan
ZOU YUCHENG
Qiu Keheng

Assignees

常熟喷嘴厂有限公司

Dates

Publication Date: 20260512
Application Date: 20250811

Claims (10)

1. The wear-resistant deformation-resistant pulverized coal spray gun is provided with a pulverized coal inlet wear-resistant steel pipe (6) and is characterized by also comprising a high-temperature end gun barrel assembly (1) and a low-temperature end steel pipe (2), wherein one end of the low-temperature end steel pipe (2) is connected with the other end of the high-temperature end gun barrel assembly (1), the other end of the low-temperature end steel pipe (2) is connected with one end of the pulverized coal inlet wear-resistant steel pipe (6), a cold end protection steel pipe (4) is welded outside the joint of the low-temperature end steel pipe (2) and the pulverized coal inlet wear-resistant steel pipe (6), one end of the cold end protection steel pipe (4) is welded on the low-temperature end steel pipe (2), and the other end of the cold end protection steel pipe is welded on the pulverized coal inlet wear-resistant steel pipe (6); The high-temperature end gun barrel assembly (1) is formed by sleeving an inner composite ceramic steel pipe (9), a middle-layer anti-deformation steel pipe (10) and an outer-layer anti-deformation steel pipe (11) from inside to outside; The outside of junction of high temperature end barrel subassembly (1) and low temperature end steel pipe (2) is equipped with high temperature end protection steel pipe (8), and the one end welding of high temperature end protection steel pipe (8) is on high temperature end barrel subassembly (1), and the other end welding of high temperature end protection steel pipe (8) is on low temperature end steel pipe (2), and high temperature end protection steel pipe (8) external welding has two shock-proof balls (7).
2. The wear-resistant and deformation-resistant pulverized coal injection lance as claimed in claim 1, wherein the inner composite ceramic steel pipe (9) is a composite ceramic pipe formed by sintering by a self-propagating aluminothermic cladding method, the outer part of the inner composite ceramic steel pipe (9) is a 310S heat-resistant stainless steel pipe or a heat-resistant stainless steel pipe with performance not lower than that of the brand, the inner part is a ceramic layer, and one end of the inner composite ceramic steel pipe (9) has a certain angle.
3. The wear-resistant deformation-resistant pulverized coal injection lance as set forth in claim 2, wherein the middle layer deformation-resistant steel pipe (10) is made of 310S heat-resistant stainless steel or heat-resistant stainless steel with performance not lower than that of the brand, one end of the middle layer deformation-resistant steel pipe (10) is not welded with the inner composite ceramic steel pipe (9), the other end of the middle layer deformation-resistant steel pipe (10) is welded with the inner composite ceramic steel pipe (9), and one end of the middle layer deformation-resistant steel pipe (10) is processed into a cone shape.
4. A wear-resistant deformation-resistant pulverized coal injection lance as set forth in claim 3, wherein the outer layer deformation-resistant steel pipe (11) is made of 310S heat-resistant stainless steel or heat-resistant stainless steel with performance not lower than that of the brand, one end of the outer layer deformation-resistant steel pipe (11) is not welded with the middle layer deformation-resistant steel pipe (10), the other end of the outer layer deformation-resistant steel pipe (11) is welded with the middle layer deformation-resistant steel pipe (10), one end of the outer layer deformation-resistant steel pipe (11) is processed into a cone shape, the outer layer deformation-resistant steel pipe (11) is shorter than the middle layer deformation-resistant steel pipe (10), and one end of the outer layer deformation-resistant steel pipe (11) and one end of the middle layer deformation-resistant steel pipe (10) are combined to be streamline.
5. A wear-resistant and deformation-resistant pulverized coal injection lance as set forth in claim 4, wherein one end of the inner composite ceramic steel pipe (9) is welded with a wear-resistant retainer ring (12), and the material of the wear-resistant retainer ring (12) is 2848W5 high-nickel-chromium alloy or high-nickel-chromium alloy with performance not lower than that of the brand.
6. A wear-resistant and deformation-resistant pulverized coal injection lance as set forth in claim 5, wherein the high-temperature end protection steel pipe (8) is made of 304 heat-resistant stainless steel or heat-resistant stainless steel with performance not lower than that of the brand.
7. The wear-resistant and deformation-resistant pulverized coal spray gun as claimed in claim 6, wherein the pulverized coal inlet wear-resistant steel pipe (6) is a composite ceramic pipe formed by sintering by a self-propagating aluminothermic cladding method, the outside of the pulverized coal inlet wear-resistant steel pipe (6) is a 304 stainless steel pipe or a stainless steel pipe with performance not lower than 304, and the inside is a ceramic layer.
8. The wear-resistant and deformation-resistant pulverized coal injection lance as set forth in claim 7, wherein the low-temperature end steel pipe (2) is 304 stainless steel pipe or stainless steel pipe with performance not lower than 304, or composite ceramic pipe sintered by self-propagating aluminothermic cladding method.
9. The wear-resistant and deformation-resistant pulverized coal injection lance as set forth in claim 8, wherein a lance adjusting steel plate (5) is arranged outside the cold end protection steel pipe (4).
10. The wear-resistant and deformation-resistant pulverized coal injection lance as set forth in claim 9, wherein the low-temperature end steel pipe (2) is externally sleeved with the lance clamp (3).

Description

Wear-resisting anti-deformation pulverized coal spray gun Technical Field The utility model belongs to the technical field of pulverized coal injection devices, and particularly relates to a wear-resistant and deformation-resistant pulverized coal spray gun. Background In the modern blast furnace smelting process, a blast furnace pulverized coal spray gun is used as key equipment to bear the important duty of spraying pulverized coal into a blast furnace body, and the performance quality of the blast furnace pulverized coal spray gun has profound effects on the stability, economy and environmental protection of blast furnace production. During normal production of the blast furnace, the belly pipe can blow oxygen-enriched hot air into the blast furnace, and the temperature is usually maintained at 1100-1200 ℃. Meanwhile, the gas-solid two-phase flow consisting of coal dust and conveying gas thereof exists in the spray gun, and the inner wall of the spray gun is continuously eroded. The straight pipe structure of the common spray gun is convenient for plugging and unplugging, but the pulverized coal flow is easy to deviate from the center of the tuyere and wash the tuyere so as to aggravate abrasion, while the bent pipe spray gun can avoid direct washing of the tuyere by the pulverized coal flow, but the bent part is easy to be worn by the pulverized coal and even broken down, thereby not only shortening the service life of the spray gun, but also influencing the service life of the tuyere, increasing the maintenance cost of equipment and the damping-down frequency of a blast furnace and severely restricting the high-efficiency production of the blast furnace. The working environment of the blast furnace pulverized coal injection gun is extremely bad. In the region of about 1.2 m at the front end of the spray gun, the temperature outside the pipe is often higher than 1200 ℃, and the temperature of the part of the spray pipe is still high in spite of the cooling of the coal powder gas-solid two-phase flow in the pipe, so that the strength of the spray pipe is reduced, and serious deformation can occur in a short period of time under the action of gravity. The jet direction of the deformed spray gun and the pulverized coal gas-solid two-phase flow is changed, so that the abrasion to the tuyere small sleeve is further increased, and a vicious circle is formed. The service life of the pulverized coal injection lances of the blast furnace in the current market is generally shorter. Under the comprehensive actions of various adverse factors such as high temperature, high flow rate coal powder scouring, complex airflow environment and the like, the service life of the spray gun is only about 3 months under normal conditions. Such as some spray guns made of common materials, have a life even less than 10 days in modern blast furnace environments with high wind temperatures and high oxygen enrichment, and require frequent replacement. The labor intensity of workers is increased, the production cost is also increased, in addition, in the process of frequently replacing the spray gun, the blast furnace needs to be temporarily damped, the continuous and stable production of the blast furnace is affected, and the production efficiency is reduced. In summary, the existing pulverized coal injection lance for the blast furnace has obvious defects in wear resistance, deformation resistance and service time, and cannot meet the increasing production demands of high efficiency, stability and low cost of blast furnace smelting. Therefore, the development of a novel blast furnace pulverized coal spray gun with excellent wear resistance, strong deformation resistance and long service time has urgent practical significance. Among the prior art, like CN207062310U discloses a blast furnace injection fuel spray gun, its characterized in that, blast furnace injection fuel spray gun is the single tube rifle that does not contain outer cold air pipe, including entrance section, expansion pipe section and the blowout port section that connects gradually, the entrance section includes the buggy takeover, the expansion pipe section include with the wear-resisting steel pipe that the buggy takeover links to each other, with the barrel that the wear-resisting steel pipe links to each other, the blowout port section include with the nipple that the barrel links to each other, with the composite ceramics nozzle pipe of the area angle that the nipple links to each other, wear-resisting steel pipe and barrel junction cover is equipped with first adapter sleeve, wear-resisting steel pipe and buggy takeover's junction cover is equipped with the second adapter sleeve, and the head end passes through lock nut locking on the buggy takeover, the cover is equipped with the fiber sleeve on the barrel, the fiber sleeve passes through the retaining ring spacing, the junction cover of nipple and composite ceramics nozzle pipe is equipped with the protectiv