CN213924894U

CN213924894U - Converter gas dry-type dust removal and waste heat recovery system

Info

Publication number: CN213924894U
Application number: CN202022908151.0U
Authority: CN
Inventors: 任毅; 陈新; 周涛; 于培锋
Original assignee: Beijing Lihua Science Technology Co ltd
Current assignee: Beijing Lihua Science Technology Co ltd
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2021-08-10
Anticipated expiration: 2030-12-07

Abstract

The utility model discloses a converter coal gas dry-type removes dust and waste heat recovery system, including consecutive turn to flue, cyclone, decline cooling zone, the curved dust removal section of banana, the cooling zone that rises and afterbody waste heat section, and decline cooling zone, the curved dust removal section of banana and the cooling zone that rises between form the U-shaped connection. The cyclone dust collector is used as a front dust collector and comprises an upper exhaust type cyclone dust collector or a lower exhaust type cyclone dust collector. The descending cooling section is provided with a vertical heated tube or tube panel which forms longitudinal scouring. An evaporation heating surface forming transverse or longitudinal scouring is arranged in the ascending cooling section. The utility model has the advantages of saving water, recovering the heat of the converter gas, effectively reducing the water content of the gas and the volume of the gas, etc.

Description

Converter gas dry-type dust removal and waste heat recovery system

Technical Field

The utility model relates to a converter coal gas dry-type removes dust and waste heat recovery system belongs to converter coal gas comprehensive utilization technical field.

Background

A converterThe steelmaking smelting period comprises an air refining period and a non-air refining period, and generally one smelting period is 28-38 min, wherein the air refining period is 14-18 min, and the non-air refining period is 14-20 min. The furnace gas is generated only in the blowing period, and the amount of the furnace gas changes greatly along with the time. The gas temperature of the converter is very high, the temperature at the outlet of the converter is 1400-1600 ℃, and the dust content is very high, about 80-150 g/m³. Meanwhile, the content of CO in the converter gas is often more than 70%.

The current converter gas dust removal technology comprises wet dust removal and dry dust removal. The wet dust removal method has the defects of low dust removal efficiency, large system resistance loss, high operation cost, secondary pollution hidden danger caused by a large amount of sewage generated by dust removal and the like. The dry dedusting system comprises a vaporization cooling flue, a steam generator and electrostatic dedusting, and overcomes the defects of wet dedusting, but has the defects of potential explosion hazard and the like. Meanwhile, the waste heat, especially the converter gas of about 1000 ℃ output by the vaporization cooling flue, cannot be effectively recovered no matter the wet dust removal or the dry dust removal.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a converter coal gas dry-type removes dust and waste heat recovery system can connect after the vaporization flue for about 1000 ℃ of converter coal gas removes dust and waste heat recovery.

The utility model discloses a realize through following technical scheme:

a converter gas dry dust removal and waste heat recovery system comprises a turning flue, a cyclone dust collector, a descending cooling section, a banana bend dust removal section, an ascending cooling section and a tail waste heat section which are sequentially connected, wherein the descending cooling section, the banana bend dust removal section and the ascending cooling section are connected in a U shape, and a connecting flue is arranged between the cyclone dust collector and the descending cooling section; the descending cooling section and the ascending cooling section are respectively arranged on two sides of the U shape, and the banana bending dust removal section is arranged at the bottom of the U shape; the descending cooling section comprises a descending section shell and a vertical heating assembly arranged in the descending section shell, and converter gas forms longitudinal flow scouring on the vertical heating assembly; the ascending cooling section comprises an ascending section shell and an evaporation heating surface arranged in the ascending section shell; a plurality of countercurrent baffles are arranged in the banana corner dust removal section, and a scraper ash remover is arranged at the bottom of the banana corner dust removal section; the tail waste heat section comprises a tail flue gas channel and a plurality of coal economizers arranged in the tail flue gas channel, and converter gas forms cross flow scouring on the coal economizers.

In the technical scheme, the steering flue is arranged in a hollow shell mode, and a membrane water-cooled wall structure is selected; and a plurality of water spray holes are formed at the inlet of the steering flue.

One of the technical schemes is that the descending cooling section is arranged in a cylindrical shape, and the vertical heating assembly is a vertical heating pipe which is distributed.

In the above technical scheme, the vertical heated tube is arranged in a plurality of concentric circles with the central axis of the cylinder as the center of a circle.

In another technical scheme, the descending cooling section is arranged in a square cylinder shape, and the vertical heating assembly is a vertical heating tube in distributed arrangement or a vertical tube panel in square surrounding arrangement.

According to one technical scheme, the evaporation heating surface comprises a plurality of groups of W-shaped evaporation heating pipe groups arranged laterally, two adjacent groups of W-shaped evaporation heating pipe groups are arranged in a reverse staggered mode, and converter gas forms cross flow scouring on the evaporation heating surface.

In another technical scheme, the evaporation heating surface comprises a plurality of vertically arranged evaporation heating pipes, so that converter gas forms longitudinal flow scouring on the evaporation heating surface.

In the technical scheme, the cyclone dust collector is an upper exhaust type cyclone dust collector or a lower exhaust type cyclone dust collector.

The utility model has the advantages of it is following and beneficial effect:

the utility model provides a converter coal gas dry process dust removal and heat recovery's that steel industry has not solved difficult problem always, compare with traditional OG method and LT method, not only have the water conservation, retrieve thermal advantage, solved the difficult problem of waste water treatment simultaneously, still effectively reduced coal gas moisture content and coal gas volume, improved the operating condition of follow-up dust remover greatly to reduced the dust remover load, the dust of receiving is dry particle, is convenient for metal recovery and dust after utilize.

Drawings

Fig. 1 is a schematic view of a dry dust removal and waste heat recovery system for converter gas according to a first embodiment of the present invention.

Fig. 2 is a schematic view of a dry dust removal and waste heat recovery system for converter gas according to a second embodiment of the present invention.

Fig. 3 is a schematic view of a dry dust removal and waste heat recovery system for converter gas according to a third embodiment of the present invention.

Fig. 4 is a schematic view of a dry dust removal and waste heat recovery system for converter gas according to a fourth embodiment of the present invention.

In the figure: 1-cyclone dust collector; 2-connecting a flue; 3-descending cooling section; 4-bending and dedusting section of bananas; 5-scraper ash discharger; 6-ascending cooling section; 7-turning a flue; 8-water spray holes; 9-tail waste heat section; 10-a vertical heated assembly; 11-evaporation heating surface; 12-economizer.

Detailed Description

The following describes the embodiments and working processes of the present invention with reference to the accompanying drawings.

The terms of orientation such as up, down, left, right, front, and rear in the present specification are established based on the positional relationship shown in the drawings. The corresponding positional relationship may also vary depending on the drawings, and therefore, should not be construed as limiting the scope of protection.

As shown in fig. 1 to 4, a converter gas dry dust removal and waste heat recovery system comprises a turning flue 7, a cyclone dust collector 1, a descending cooling section 3, a banana bend dust removal section 4, an ascending cooling section 6 and a tail waste heat section 9 which are connected in sequence. The system also includes a steam drum. The converter gas from the converter outlet is cooled through the vaporization flue, and is usually cooled to about 1000 ℃. The inlet of the diverting flue 7 can be connected to the outlet of the vaporizing flue.

The turning flue 7 is arranged in a hollow shell mode, a membrane water-cooled wall structure is selected, and the turning flue is usually arranged in an L shape. A plurality of water spray holes 8 are formed in the inlet of the steering flue 7, and water can be sprayed to cool rapidly in an accident period. During normal operation, the return flue 7 serves as a connecting channel.

As shown in fig. 1 and 2 or fig. 3 and 4, the cyclone dust collector 1 includes an upper exhaust type cyclone dust collector and a lower exhaust type cyclone dust collector. A connecting flue 2 is arranged between the cyclone dust collector 1 and the descending cooling section 3. The connecting flue 2 is arranged according to the exhaust mode of the cyclone dust collector 1 and is connected between the flue gas outlet of the cyclone dust collector 1 and the inlet of the descending cooling section 3. The cyclone dust collector 1 is used as a front dust collector, and firstly removes dust from the converter gas for one time, so that the abrasion pressure of a subsequent waste heat utilization system is reduced.

Descend and form the U-shaped connection between cooling segment 3, the bent dust removal section 4 of banana and the cooling segment 6 that rises, descend cooling segment 3 to set up in the left side of U-shaped, rise cooling segment 6 and set up in the right side of U-shaped, and bent dust removal section 4 of banana sets up in the U-shaped bottom, and this kind of structure makes and has formed the U-shaped separator between descending cooling segment 3, the bent dust removal section 4 of banana, the cooling segment 6 that rises.

The descending cooling section 3 comprises a descending section shell and a vertical heating assembly 10 arranged in the descending section shell, and converter gas forms longitudinal flow scouring on the vertical heating assembly 10.

The descending cooling section is provided in two ways.

One technical scheme is that the descending cooling section 3 is arranged in a cylindrical shape, a steel cylinder can be selected as a descending section shell, and at the moment, refractory materials are built on the inner wall surface of the steel cylinder to prevent high-concentration dust particles from being scoured and abraded. The descending section shell can also directly adopt a cylindrical membrane type water-cooled wall structure in sealing connection, and has the heat exchange and cooling effects. In the cylindrical descending cooling section, the vertical heating assembly is a vertical heating pipe which is distributed. As an optimized implementation mode, the vertical heated tube takes the central axis of the cylinder as the center of a circle and is arranged in a plurality of concentric circles.

The other technical scheme is that the descending cooling section 3 is in a square barrel shape, the descending section shell is of a membrane selection type water-cooled wall structure, the sealing performance is good, and meanwhile, the heat exchange and cooling effects are achieved. At the moment, the vertical heating component adopts the vertical heating tubes which are distributed or the vertical tube panels which are arranged in a square surrounding manner. Generally speaking, a tube bank or a tube panel arranged from bottom to top is selected and arranged in a sectional manner according to requirements, and the upper section and the lower section are connected through a header or are respectively connected with a steam drum through an ascending pipe/a descending pipe. The windward side of the anti-abrasion device is provided with an anti-abrasion cover plate to protect the pipe from abrasion.

The banana bend dust removal section 4 is arranged at the bottom of the descending cooling section 3 and the ascending cooling section 6, the wall surface adopts a membrane wall structure, a plurality of counter-flow baffles are arranged in the membrane wall structure, the counter-flow baffles are usually 3-5, the counter-flow baffles are arranged in a counter-flow mode with the flow direction of converter gas, and the counter-flow baffles are inclined at an angle of 45 degrees. The bottom of the banana corner dust removal section is provided with a scraper ash remover 5.

The ascending cooling section 6 includes an ascending section shell and an evaporating heating surface 11 disposed within the ascending section shell. The shell of the rising section is usually of a water-cooled membrane wall structure. There are two ways to arrange the evaporation heating surface.

In one of the manners, as shown in fig. 1 and 2, the evaporation heating surface 11 includes a plurality of groups of W-shaped evaporation heating tube groups arranged laterally, and two adjacent groups are arranged in a reverse staggered manner, so that the converter gas forms cross-flow scouring on the evaporation heating surface.

In another embodiment, as shown in fig. 3 and 4, the evaporation heating surface 11 includes a plurality of vertically arranged evaporation heating pipes, so that the converter gas forms a longitudinal flow scouring on the evaporation heating surface. And according to the requirement, the evaporation heating surface can be arranged in a sectional mode, and the upper section and the lower section are connected through a header or respectively connected with a steam drum through an ascending pipe/a descending pipe. The windward side of the anti-abrasion device is provided with an anti-abrasion cover plate to protect the pipe from abrasion.

The tail part waste heat section 9 is vertically or transversely arranged, a plurality of coal economizers 12 are arranged in the tail part waste heat section, and converter gas forms cross flow scouring on the coal economizers. The outlet of the tail waste heat section can be connected with a dust remover to further remove dust of the purified coal gas.

Fig. 1 to 4 show a schematic combination of a cyclone dust collector 1 with different exhaust modes and different types of ascending cooling sections 6, respectively, representing only four embodiments thereof: in the first embodiment, the upper exhaust type cyclone dust collector and the ascending cooling section flushed by transverse flow are arranged in the lower part of the upper exhaust type cyclone dust collector; in the second embodiment, the lower exhaust type cyclone dust collector and the ascending cooling section flushed by cross flow are arranged; in the third embodiment, the upper exhaust type cyclone dust collector and the ascending cooling section flushed by longitudinal flow are arranged; and in the fourth embodiment, the lower exhaust type cyclone dust collector and the ascending cooling section flushed by the longitudinal flow. The arrangement mode of the tail waste heat section 9 can be interchanged, and more embodiments are formed.

After the converter gas is subjected to primary cooling through the vaporization flue, the converter gas enters the system for dry dust removal and cooling, so that the water content and the volume of the gas are effectively reduced, the working conditions of a subsequent dust remover are greatly improved, and the load of the dust remover is reduced. The collected dust is dry particles, so that metal recovery and dust post-utilization are facilitated.

The vertical heating components, the evaporation heating surface and the economizer are respectively provided with a header, an ascending pipe and a descending pipe, and are respectively connected with a steam drum and the header through the ascending pipe and the descending pipe. And because the converter gas contains high-concentration CO, the shells of all the pipe sections and the connecting parts of the shells are sealed, and the parts of all the heat exchange assemblies, such as the vertical heated pipe, the vertical pipe panel, the evaporation heated surface, the economizer, the ascending pipe, the descending pipe, the header and the like, which penetrate through the shells are sealed. Those skilled in the art will understand and envision this and will not be described in detail herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The converter gas dry dust removal and waste heat recovery system is characterized by comprising a turning flue (7), a cyclone dust collector (1), a descending cooling section (3), a banana bend dust removal section (4), an ascending cooling section (6) and a tail waste heat section (9) which are sequentially connected, wherein the descending cooling section (3), the banana bend dust removal section (4) and the ascending cooling section (6) are connected in a U shape, and a connecting flue (2) is arranged between the cyclone dust collector (1) and the descending cooling section (3) for connection; the descending cooling section (3) and the ascending cooling section (6) are respectively arranged on two sides of the U shape, and the banana corner dust removal section (4) is arranged at the bottom of the U shape; the descending cooling section (3) comprises a descending section shell and a vertical heating assembly (10) arranged in the descending section shell, and converter gas forms longitudinal flow scouring on the vertical heating assembly (10); the ascending cooling section (6) comprises an ascending section shell and an evaporation heating surface (11) arranged in the ascending section shell; a plurality of countercurrent baffles are arranged in the banana corner dust removal section (4), and a scraper ash remover (5) is arranged at the bottom of the banana corner dust removal section (4); the tail waste heat section (9) comprises a tail flue gas channel and a plurality of coal economizers arranged in the tail flue gas channel, and converter gas forms cross flow scouring on the coal economizers.

2. The converter gas dry dedusting and waste heat recovery system as claimed in claim 1, wherein the diversion flue (7) is arranged in a hollow shell manner, and a membrane water-cooled wall structure is selected; and a plurality of water spray holes (8) are arranged at the inlet of the steering flue (7).

3. The dry dust removal and waste heat recovery system for converter gas as claimed in claim 1, wherein the descending cooling section (3) is cylindrical, and the vertical heating component is a vertical heating pipe distributed in a distributed manner.

4. The system for dry dust removal and waste heat recovery of converter gas according to claim 3, wherein the vertical heated tube is arranged in a plurality of concentric circles with the center axis of the cylinder as the center.

5. The dry dust removal and waste heat recovery system for converter gas as claimed in claim 1, wherein the descending cooling section (3) is provided in a square cylinder shape, and the vertical heating component is selected from vertical heating pipes in distributed arrangement or vertical pipe panels in square surrounding arrangement.

6. The converter gas dry dust removal and waste heat recovery system as recited in claim 1, wherein the evaporation heating surface (11) comprises a plurality of groups of W-shaped evaporation heated tube groups arranged laterally, and two adjacent groups are arranged in a reverse staggered manner, and the converter gas forms cross flow scouring on the evaporation heating surface.

7. The converter gas dry dedusting and waste heat recovery system as claimed in claim 1, wherein the evaporation heating surface (11) comprises a plurality of vertically arranged evaporation heating pipes, so that converter gas forms longitudinal flow scouring on the evaporation heating surface.

8. The dry dust removal and waste heat recovery system for converter gas as claimed in claim 1, wherein the cyclone dust collector (1) is an upper exhaust type cyclone dust collector or a lower exhaust type cyclone dust collector.