CN214345604U

CN214345604U - Heat preservation of coke oven flue gas dry desulfurization and denitrification system

Info

Publication number: CN214345604U
Application number: CN202120189956.6U
Authority: CN
Inventors: 吕彦强; 程俊伟; 梁杰; 祁大鹏
Original assignee: Shanxi Taigang Stainless Steel Co Ltd
Current assignee: Shanxi Taigang Stainless Steel Co Ltd
Priority date: 2021-01-25
Filing date: 2021-01-25
Publication date: 2021-10-08
Anticipated expiration: 2031-01-25

Abstract

The utility model relates to a coke oven flue gas dry desulfurization denitration technology technical field. The heat preservation layer of the coke oven flue gas dry desulfurization and denitrification system comprises a first nanometer aerogel felt, a second nanometer aerogel felt, a first mineral wool layer, a second mineral wool layer, a steel wire mesh and an iron sheet, wherein the heat preservation layer is arranged outside all components and pipelines of the coke oven flue gas dry desulfurization and denitrification system, the first layer of the heat preservation layer is the first nanometer aerogel felt, the second nanometer aerogel felt is arranged at the outer staggered joint of the first nanometer aerogel felt, the first mineral wool layer is arranged above the second nanometer aerogel felt by 90-150mm, the second mineral wool layer is arranged at the outer staggered joint of the first mineral wool layer, the steel wire mesh is arranged outside the second mineral wool layer, and the iron sheet is arranged outside the steel wire mesh. Adopt the utility model discloses keep warm to equipment, can effectively reduce the energy consumption, reducible coal gas consumption expense 790 ten thousand yuan each year.

Description

Heat preservation of coke oven flue gas dry desulfurization and denitrification system

Technical Field

The utility model relates to a coke oven flue gas dry desulfurization denitration technology technical field.

Background

A7.63 m coke oven heating system is a fuel made up by mixing blast furnace gas and coke oven gas as heat source for heating dry distillation coke of coke oven, because the blast furnace gas contains a certain quantity of hydrogen sulfide, and the coke oven gas also contains a certain quantity of hydrogen sulfide and organic sulfur, when these sulfur-containing harmful components are combusted in the combustion chamber of coke oven, the sulfur dioxide and nitrogen oxide can be produced, these two substances are main components for polluting atmosphere, according to the requirements of national environmental protection department, these two kinds of gases must be treated by a certain process before being discharged into atmosphere, and two kinds of harmful substances can be removed, and the flue gas can be discharged into atmosphere, so that the pollution to atmosphere can be reduced.

The sulfur dioxide and nitrogen oxide in the coke oven gas are removed by sodium bicarbonate dry desulfurization and SCR medium-low temperature denitration technology. Because the 7.63 m coke oven adopts the mixed heating of blast furnace gas and coke oven gas, and the coke oven is a segmented heating system, the flue gas temperature is lower, the heat storage temperature is about 200 ℃, the flue gas enters the denitration tower after passing through a pipeline, the desulfurization tower and the dust remover, the temperature can be reduced by 40-50 ℃, the flue gas temperature is about 150-160 ℃, the temperature window of the existing denitration catalyst is at least 180 ℃, the light-off temperature cannot be reached, and the purpose of high-efficiency denitration cannot be realized. To ensure that the inlet temperature of the denitration tower reaches 180 ℃, only two schemes are provided: 1) the heat dissipation capacity of the pipeline, the desulfurizing tower and the dust remover is reduced. 2) And the heating hot blast stove heats the flue gas to over 180 ℃ after the flue gas enters the denitration tower. After repeated demonstration, the aim of reducing heat dissipation is achieved by adopting a composite heat insulation mode of a new nanometer heat insulation material and mineral wool.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a heat preservation of coke oven flue gas dry desulfurization and denitrification system aiming at the problems.

The purpose of the utility model is realized like this: the heat preservation layer of the coke oven flue gas dry desulfurization and denitrification system comprises a first nanometer aerogel felt, a second nanometer aerogel felt, a first mineral wool layer, a second mineral wool layer, a steel wire mesh and an iron sheet, wherein the heat preservation layer is arranged outside all components and pipelines of the coke oven flue gas dry desulfurization and denitrification system, the first layer of the heat preservation layer is the first nanometer aerogel felt, the second nanometer aerogel felt is arranged at the outer staggered joint of the first nanometer aerogel felt, the first mineral wool layer is arranged above the second nanometer aerogel felt by 90-150mm, the second mineral wool layer is arranged at the outer staggered joint of the first mineral wool layer, the steel wire mesh is arranged outside the second mineral wool layer, and the iron sheet is arranged outside the steel wire mesh.

Further, the thickness of the first nanometer aerogel felt and the second nanometer aerogel felt is 3-10 mm.

Further, the thickness of the first mineral wool layer and the second mineral wool layer is 30-70 mm.

Further, the first mineral wool layer is arranged above the second nano aerogel felt through a welded support.

The utility model has the advantages that:

1. adopt the utility model discloses keep warm to flue gas pipeline and dust remover body and ash bucket part, flue gas temperature begins from getting into the desulfurizing tower to going out the dust remover, and the temperature reduces < 15 ℃, ensures that flue gas temperature is more than 180 degrees centigrade, reaches the light-off temperature of denitration catalyst, ensures denitration efficiency.

2. Adopt the utility model discloses keep warm to equipment, can effectively reduce the energy consumption, reducible coal gas consumption expense 790 ten thousand yuan each year.

Drawings

The present invention will be further described with reference to the accompanying drawings.

Fig. 1 is a diagram of the present invention.

FIG. 2 is an equipment diagram of a coke oven flue gas dry desulfurization and denitrification system applied by the utility model.

Wherein: 1. the composite material comprises a first nanometer aerogel felt, a second nanometer aerogel felt, a first mineral wool layer, a second mineral wool layer, a lap seam, a steel wire mesh and an iron sheet, wherein the first nanometer aerogel felt is 2, the second nanometer aerogel felt is 3, the first mineral wool layer is 4, the second mineral wool layer is 5, and the steel wire mesh is 6 and the iron sheet is 7.

Detailed Description

The heat-insulating layer adopts a composite heat-insulating form of new nano heat-insulating material and mineral wool to reduce heat dissipation and ensure that the temperature of flue gas entering the desulfurization chamber is reduced to no more than 15 ℃ to the outlet temperature of the dust remover.

1. As a novel scientific and technological heat insulation material, the nanometer aerogel felt is widely applied to pipelines with the diameter less than 900mm at present, the aerogel is light and thin, convenient to construct, long in service life, and excellent in high temperature resistance and water-resistant heat insulation performance. However, under the condition that the heat insulation effect is theoretically established due to no application case of large-diameter pipelines and plane heat insulation, whether the requirement of 15 ℃ temperature reduction can be met or not is influenced by the construction scheme and the construction quality, the practical inspection must be carried out, and in order to ensure that the heat insulation effect of the system reaches the standard, the heat insulation process scheme is recommended to be changed.

2. On the selection of materials, 2 layers of 6mm nanometer aerogel felt and two layers of 50mm mineral wool are used. The heat preservation process adopts the steps that a layer of nano aerogel is paved at the bottom of the inner part (steel plate layer) and fixed by an anchor, and the second layer of nano aerogel is in staggered joint with the first layer of nano aerogel and is fixed by the anchor. After the heat preservation of the two layers of nano aerogel felts, the surfaces of the equipment are completely covered, and the heat emitted from the lap joints is effectively locked.

3. 5 x 5 angle steel keels are welded on the pipeline or the plane equipment, and the distance between the keels and the outer wall of the pipeline or the plane of the equipment is 110 mm.

4. The outside compound 50mm thick mineral wool of second floor nanometer aerogel, the mineral wool adopts the fix with rivet, and the back that finishes of first layer mineral wool construction is with second floor mineral wool and first layer mineral wool staggered joint overlap joint, reduces the heat dissipation between the insulation material gap. And fixing the second layer of mineral wool by rivets after the second layer of mineral wool is fixed by a steel wire mesh. The most outside adopts the various board of deashing 604, and die mould after-fixing is on the angle steel fossil fragments, and various board overlap joint adopts rivet fixation, and the various board of pipeline department can not die mould, but the overlap joint must the blank pressing, ensures that the rainwater can not get into the insulation material inside through the overlap joint gap.

5. The steel wire mesh is arranged outside the second layer of mineral wool, and the iron sheet is arranged outside the steel wire mesh to play a role in fixing.

From the inlet pipeline of the flue gas desulfurization tower, the inlet of the flue gas desulfurization tower, the dust remover and the flue gas pipeline to the denitration tower is a radiating surface.

The specific embodiment of the equipment heat preservation of the Tai steel in the implementation of the 7#, 8#, 9# coke oven flue gas dry desulfurization and denitrification construction process is as follows:

heat preservation scheme of desulfurization and denitrification system

First, material selection

2 layers of 6mm nanometer aerogel felts, two layers of 50mm thick mineral wool, and a plurality of blue-gray 604 color plates, rivets and holding nails, 5 x 5 angle steel, 50 x 50 steel wire meshes, self-tapping screws and rivets are arranged on the outer layers.

Second, heat preservation form

Adopting two layers of 6mm nanometer aerogel staggered joints for lap joint, adopting two layers of 50mm mineral wool staggered joints for lap joint, adopting a steel wire mesh for enclosing and fixing the outer layer, adopting a grabbing nail for anchoring the heat insulation material, adopting a blank pressing color plate for the outer layer of the large-diameter pipeline, and fixing the blank pressing color plate by using a rivet; and the plane equipment is fixed by self-tapping screws after being pressed.

Third, the construction sequence

1) And welding the anchoring grab nails on the surface of the pipeline or the plane equipment.

2) The nano aerogel blanket was cut to the desired size.

3) And (3) fixing the first layer of nano aerogel after the first layer of nano aerogel passes through the grabbing nails, wherein the gap at the lap joint of the two layers of nano aerogel is less than 2 mm.

4) The second layer nanometer aerogel passes the grapple after fixed with first layer nanometer aerogel staggered joint overlap joint, two aerogel overlap joints gap < 2 mm.

5) The third layer is made of 50mm thick mineral wool and fixed after passing through the grab nails.

6) The fourth layer is made of 50mm thick mineral wool, fixed after passing through the nails, and is in staggered joint with the third layer, and the joint gap is less than 2mm

7) And 50 x 50 steel wire meshes are coated outside the fourth layer of heat insulation material, and the outermost layer is sealed by a grey 604 color plate. The color plates at the pipeline are in blank pressing lap joint, so that rainwater is prevented from permeating into the heat preservation layer, and the color plates of the plane equipment are in compression lap joint and fixed by self-tapping screws.

Points of attention

Because the construction operation is responsible, constructors need to strictly construct according to the scheme, the butt joint gaps are strictly executed according to the standard, the layers are strictly overlapped according to the staggered joint scheme, and each layer needs to firmly penetrate through the fixed grabbing nails to avoid the heat insulation layer from falling off.

The composite heat-insulating process of the nanometer aerogel felt and the conventional heat-insulating materials (such as mineral wool, rock wool, aluminum silicate and the like) can be applied to pipeline equipment such as steam pipelines, hot water pipelines, flue gas pipelines and the like and large-area plane equipment specially aiming at various working conditions requiring small heat loss, and can realize the optimal heat-insulating combination, improve the energy utilization rate and reduce the energy consumption cost by adopting different composite modes through heat dissipation calculation.

The above description is only for the specific embodiment of the present invention, but the structural features of the present invention are not limited thereto, and any person skilled in the art can be within the scope of the present invention, and all the changes and modifications made are covered by the claims of the present invention.

Claims

1. The heat-insulating layer of the coke oven flue gas dry desulfurization and denitrification system is characterized in that: the coke oven flue gas dry desulfurization and denitrification system comprises a first nanometer aerogel felt, a second nanometer aerogel felt, a first mineral wool layer, a second mineral wool layer, a steel wire mesh and an iron sheet, wherein heat preservation layers are arranged outside all components and pipelines of the coke oven flue gas dry desulfurization and denitrification system, the first layer of the heat preservation layer is the first nanometer aerogel felt, the second nanometer aerogel felt is arranged at the outer staggered joint of the first nanometer aerogel felt, the first mineral wool layer is arranged above the second nanometer aerogel felt by 90-150mm, the second mineral wool layer is arranged at the outer staggered joint of the first mineral wool layer, the steel wire mesh is arranged outside the second mineral wool layer, and the iron sheet is arranged outside the steel wire mesh.

2. The insulating layer of the coke oven flue gas dry desulfurization and denitrification system according to claim 1, which is characterized in that: the thickness of the first nanometer aerogel felt and the second nanometer aerogel felt is 3-10 mm.

3. The insulating layer of the coke oven flue gas dry desulfurization and denitrification system according to claim 1, which is characterized in that: the thickness of the first mineral wool layer and the second mineral wool layer is 30-70 mm.

4. The insulating layer of the coke oven flue gas dry desulfurization and denitrification system according to claim 1, which is characterized in that: the first mineral wool layer is arranged above the second nano aerogel felt through a welded bracket.