CN113150799A

CN113150799A - Integrated dry quenching waste heat utilization system with primary dust removal function

Info

Publication number: CN113150799A
Application number: CN202110566963.8A
Authority: CN
Inventors: 王亮; 陈巍; 汤习中; 孙刚; 张炜; 杜兵; 曾强; 徐列; 毛旸; 佟津; 王雨
Original assignee: Sichuan Chuanguo Boiler Co Ltd
Current assignee: Sichuan Chuanguo Boiler Co Ltd
Priority date: 2021-05-24
Filing date: 2021-05-24
Publication date: 2021-07-23

Abstract

The invention discloses a primary dust removal integrated coke dry quenching waste heat utilization system which comprises a coke dry quenching furnace, a primary dust remover and a waste heat boiler, wherein the primary dust remover is arranged between an air outlet of the coke dry quenching furnace and an air inlet of the waste heat boiler and is used for separating high-temperature circulating gas which is output by the coke dry quenching furnace and carries coke powder from the coke powder and inputting the separated high-temperature circulating gas into the waste heat boiler. Wherein, the primary dust remover is a water-cooling cyclone separator which comprises a film type water-cooling tube bank body, a smoke inlet, a smoke outlet and a powder outlet. The water-cooled cyclone separator is used as a separating device, so that the coke powder of the circulating flue gas can be efficiently separated, and the heating surface of the waste heat boiler is effectively protected; meanwhile, as a cooling device, the temperature of the flue gas at the inlet of the waste heat boiler can be reduced, and the furnace wall material in the separator is protected; the heat recovery device can also be used as a part of an evaporation heating surface of the boiler, so that the evaporation heating area arranged in the waste heat boiler is reduced.

Description

Integrated dry quenching waste heat utilization system with primary dust removal function

Technical Field

The invention relates to the technical field of coking, in particular to a primary dust removal integrated coke dry quenching waste heat utilization system.

Background

Dry quenching is a great energy-saving and environment-friendly technology in the steel industry and is a quenching technology for replacing wet quenching. The basic principle is that inert gas (or waste flue gas) is used as circulating gas, and the circulating gas exchanges heat with incandescent coke in a dry quenching furnace, so that the temperature of the coke is cooled from 1000 ℃ to below 250 ℃, and the purpose of quenching the coke is achieved. The circulating gas absorbing the coke heat transfers the heat to a waste heat boiler to generate medium-pressure (or high-pressure) steam, and the cooled inert gas is blown into the dry quenching furnace by a circulating fan. The dry quenching technology can improve the quality of coke, avoid the pollution of wet quenching to the environment and recover the sensible heat of red coke, and can play the dual roles of energy saving and environmental protection.

As shown in fig. 1, the conventional dry quenching waste heat recovery system includes a dry quenching furnace 101, a primary dust remover 102, a waste heat boiler 103, a secondary dust remover 104, a circulating fan 105 and a secondary economizer 106, which are connected in sequence.

The conventional primary dust collector 102 is a gravity settling chamber, and comprises a gravity retaining wall (or not) and an ash bucket, and the circulating gas from the dry quenching furnace 1 is stopped by the gravity retaining wall (or only settled by gravity) in the primary dust collector 102, so that the coke powder mixed in the circulating gas falls to the ash bucket under the action of gravity due to the speed reduction.

The primary dust remover 102 adopts an inertia separation technology or a gravity retaining wall, and the system generally has the problems of huge equipment, wide occupied area, low separation efficiency, serious abrasion of the heating surface of the waste heat boiler 103 and the like.

Disclosure of Invention

In order to solve the problems, the invention provides a primary dust removal integrated coke dry quenching waste heat utilization system, wherein a water-cooling cyclone separator is used as a separation device and can efficiently separate coke powder of circulating flue gas, so that the heating surface of a waste heat boiler is effectively protected; meanwhile, as a cooling device, the temperature of the flue gas at the inlet of the waste heat boiler can be reduced, and the furnace wall material in the separator is protected; the heat recovery device can also be used as a part of an evaporation heating surface of the boiler, so that the evaporation heating area arranged in the waste heat boiler is reduced.

The invention discloses a primary dust removal integrated coke dry quenching waste heat utilization system, which comprises a coke dry quenching furnace, a primary dust remover and a waste heat boiler, wherein the primary dust remover is arranged between an air outlet of the coke dry quenching furnace and an air inlet of the waste heat boiler and is used for separating high-temperature circulating gas which is output by the coke dry quenching furnace and carries coke powder from the coke powder and inputting the separated high-temperature circulating gas into the waste heat boiler;

the primary dust remover is arranged as a water-cooling cyclone separator, the water-cooling cyclone separator comprises a membrane type water-cooling tube bank body, a smoke inlet, a smoke outlet and a powder outlet, the upper half part of the membrane type water-cooling tube bank body is in a cylindrical shape, the lower half part of the membrane type water-cooling tube bank body is in a funnel shape, the smoke inlet is arranged on the side surface of the top of the membrane type water-cooling tube bank body, the smoke outlet is arranged in the center of the top of the membrane type water-cooling tube bank body, and the powder outlet is arranged at the bottom of the membrane type water-cooling tube bank body; and high-temperature circulating gas carrying coke powder enters the water-cooling cyclone separator from the smoke inlet to separate the coke powder from the high-temperature circulating gas, the separated coke powder is discharged from the powder outlet, and the separated high-temperature circulating gas is discharged from the smoke outlet.

Furthermore, the bottom of diaphragm type water-cooling bank of tubes body is provided with the lower annular header that is used for intaking, and the top is provided with the last annular header that is used for exporting the steam-water mixture.

Further, the lower annular header is connected with a steam drum water outlet of the waste heat boiler and used for outputting saturated water in the steam drum to the membrane type water-cooling tube bank body; the upper annular header is connected with a steam drum air inlet of the waste heat boiler and used for outputting saturated steam formed after heat exchange to the steam drum.

Furthermore, the membrane type water-cooling tube bank body comprises a plurality of cooling water tubes which are longitudinally arranged, and steel plates are adopted between the cooling water tubes for sealing.

Furthermore, the outer wall of the membrane type water-cooling tube bank body is provided with a transverse limiting device to prevent the cooling water tube from generating transverse displacement due to heating.

Furthermore, the transverse limiting device is of an I-shaped structure.

Furthermore, the inner wall of the membrane type water-cooling tube bank body is provided with dense pins for fixing furnace wall materials.

Furthermore, the smoke outlet of the water-cooling cyclone separator is eccentrically arranged.

The invention has the beneficial effects that:

(1) the water-cooled cyclone separator is used as a primary dust remover, so that the coke powder of the circulating flue gas can be efficiently separated, the coke powder with the particle size of 5-30 micrometers can be separated, and the efficiency of the separator can reach more than 90%, so that the abrasion of the circulating flue gas on the heating surface of the boiler can be reduced, the service life of the boiler is prolonged, and the maintenance cost of the boiler is reduced. Meanwhile, the water-cooled cyclone separator is used as a part of the evaporation heating surface of the waste heat boiler, so that the area of the evaporation heating surface in the waste heat boiler can be reduced, and the occupied area is reduced. In addition, the water-cooled cyclone separator can also be used as a cooling device, the temperature of the flue gas at the inlet of the waste heat boiler can be reduced, and the furnace wall material in the separator is protected.

(2) The water-cooled cyclone separator has extremely high separation efficiency, and the separated coke particles can meet the requirement of a circulating fan on the particle size, so that a secondary dust remover can be omitted, and the system is simplified. Therefore, the water-cooled cyclone separator is used as a primary dust remover, and can replace a two-stage separation mode of primary inertia separation and secondary separation of a multi-tube dust remover in the prior system, thereby reducing the investment cost.

(3) The water-cooling cyclone separator occupies about one third of the gravity type primary dust remover, and the occupied area of the dry quenching device is greatly reduced. In addition, the water-cooled cyclone separator operates stably, the maintenance frequency is one fourth of that of a gravity settling chamber, and the floor area of the dry quenching device can be greatly reduced.

Drawings

FIG. 1 is a schematic diagram of a prior art dry quenching waste heat recovery system;

FIG. 2 is a schematic diagram of a dry quenching waste heat utilization system of the present invention;

FIG. 3 is a schematic structural view of a water-cooled cyclone separator of the present invention;

FIG. 4 is a cross-sectional view of a water-cooled cyclone separator of the present invention;

FIG. 5 is a flow diagram of the flue gas in the water-cooled cyclone separator of the present invention;

FIG. 6 is a steam-water flow of the water-cooled cyclone separator of the present invention;

FIG. 7 is one of the schematic furnace wall laying diagrams of the water-cooled cyclone separator of the present invention;

FIG. 8 is a second schematic view of the furnace wall of the water-cooled cyclone separator of the present invention;

reference numerals: 101-dry quenching furnace, 102-primary dust remover, 103-waste heat boiler, 104-secondary dust remover, 105-circulating fan and 106-auxiliary economizer; 201-dry quenching furnace, 202-water-cooled cyclone separator, 203-waste heat boiler, 204-circulating fan, 205-auxiliary economizer; 2031-steam drum, 2021-upper ring header, 2022-lower ring header.

Detailed Description

In order to more clearly understand the technical features, objects, and effects of the present invention, specific embodiments of the present invention will now be described. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a primary dust removal integrated coke dry quenching waste heat utilization system, which comprises a dry quenching furnace 201, a primary dust remover and a waste heat boiler 203, wherein the primary dust remover is arranged between an air outlet of the dry quenching furnace 201 and an air inlet of the waste heat boiler 203 and is used for separating high-temperature circulating gas which is output by the dry quenching furnace 201 and carries coke powder from the coke powder and inputting the separated high-temperature circulating gas into the waste heat boiler 203, as shown in figure 2. In addition, the other end of the waste heat boiler 203 is sequentially connected with a circulating fan 204, an auxiliary economizer 205 and an air inlet of the dry quenching furnace 201, so that a complete closed-loop system is formed.

Specifically, the primary dust collector is provided as a water-cooling cyclone separator 202, as shown in fig. 3 and 4, the water-cooling cyclone separator 202 includes a membrane type water-cooling tube bank body, a smoke inlet, a smoke outlet and a powder outlet, the upper half part of the membrane type water-cooling tube bank body is in a cylindrical shape, the lower half part of the membrane type water-cooling tube bank body is in a funnel shape, the smoke inlet is arranged on the top side surface of the membrane type water-cooling tube bank body, the smoke outlet is arranged in the top center of the membrane type water-cooling tube bank body, and the powder outlet is arranged at the bottom of the membrane type water-cooling tube bank body. As shown in fig. 5, the working principle is as follows: the high-temperature circulating gas carrying the coke powder enters the water-cooled cyclone separator 202 from the smoke inlet to separate the coke powder from the high-temperature circulating gas, the separated coke powder is discharged from the smoke outlet, and the separated high-temperature circulating gas is discharged from the smoke outlet.

The bottom of the membrane type water-cooling tube bank body is provided with a lower annular header 2022 for water inflow, and the top is provided with an upper annular header 2021 for outputting a steam-water mixture. As shown in fig. 6, the lower annular header 2022 is connected to a water outlet of the steam drum 2031 of the exhaust-heat boiler 203, and is configured to output saturated water in the steam drum 2031 to the membrane water-cooled tube bank body; the upper ring header 2021 is connected to an air inlet of the drum 2031 of the exhaust heat boiler 203, and is configured to output the saturated steam formed after heat exchange to the drum 2031. As shown in fig. 6, the working principle is as follows: the cooling water in the film type water-cooling tube bank body comes from the saturated water of the drum 2031 of the waste heat boiler 203, the saturated water cools the circulating flue gas through the film type water-cooling tube bank body, the coke powder in the flue gas is separated, and the saturated steam after heat exchange returns to the steam side of the drum 2031 of the waste heat boiler 203 through the eduction tube.

In a preferred embodiment of the invention, the membrane type water-cooling tube bank body comprises a plurality of cooling water tubes which are longitudinally arranged, and the cooling water tubes are sealed by steel plates. Preferably, the outer wall of the membrane type water-cooling tube bank body is provided with a transverse limiting device to prevent the cooling water tube from generating transverse displacement due to heating. More specifically, the transverse limiting device is of an I-shaped structure.

In another preferred embodiment of the invention, the inner wall of the membrane type water-cooled tube bank body is provided with dense pins for fixing the furnace wall material, the furnace wall material is a temperature-resistant and wear-resistant material, and the laying method is as shown in fig. 7 and 8.

In a further preferred embodiment of the invention, the flue gas outlet of the water-cooled cyclone separator 202 is arranged eccentrically.

The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally placed when the present invention is used, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either a wired or wireless connection.

Claims

1. A CDQ waste heat utilization system integrated with primary dust removal, characterized in that it comprises a CDQ furnace, a primary dust collector and a waste heat boiler, and the primary dust collector is arranged at the air outlet of the CDQ furnace and the Between the air inlets of the waste heat boiler, it is used to separate the high temperature circulating gas carrying coke powder output from the CDQ furnace and the coke powder, and input the separated high temperature circulating gas into the waste heat boiler;

The primary dust collector is set as a water-cooled cyclone separator. The water-cooled cyclone separator includes a membrane-type water-cooled tube row body, a flue gas inlet, a smoke outlet and a powder outlet. The upper part of the membrane-type water-cooled tube row body. The half part is in the shape of a cylinder, and the lower half is in the shape of a funnel. The gas inlet is arranged on the top side of the membrane-type water-cooled tube row body, and the smoke outlet is arranged on the membrane-type water-cooled tube row body. The powder outlet is arranged at the bottom of the membrane-type water-cooled tube row body; the high-temperature circulating gas carrying coke powder enters the water-cooled cyclone from the flue gas inlet to circulate coke powder and high temperature Gas separation, the separated coke powder is discharged from the powder outlet, and the separated high-temperature circulating gas is discharged from the flue gas outlet.

2 . The CDQ waste heat utilization system integrated with primary dust removal according to claim 1 , wherein the bottom of the membrane-type water-cooled tube row body is provided with a lower annular header for water intake, and the top is provided with a lower annular header for water intake. 3 . The upper annular header that outputs the soda-water mixture.

3 . The CDQ waste heat utilization system integrated with primary dust removal according to claim 2 , wherein the lower annular header is connected to the steam drum water outlet of the waste heat boiler, and is used for removing the steam inside the steam drum. 4 . The saturated water is output to the membrane-type water-cooled tube body; the upper annular header is connected to the steam drum air inlet of the waste heat boiler, and is used for outputting the saturated steam formed after heat exchange to the steam drum.

4 . The CDQ waste heat utilization system integrated with primary dust removal according to any one of claims 1 to 3 , wherein the membrane-type water-cooling pipe row body comprises a plurality of longitudinally arranged cooling water pipes, and the cooling The water pipes are sealed with steel plates.

5 . The CDQ waste heat utilization system integrated with primary dust removal according to claim 4 , wherein the outer wall of the main body of the membrane-type water-cooling pipe is provided with a lateral limit device to prevent the cooling water pipe from being heated due to heat. 6 . produce lateral displacement.

6 . The CDQ waste heat utilization system integrated with primary dust removal according to claim 5 , wherein the lateral limiting device is arranged in an “I”-shaped structure. 7 .

7 . The CDQ waste heat utilization system integrated with primary dust removal according to any one of claims 1 to 3 , wherein the inner wall of the membrane-type water-cooled tube bank body is provided with dense pins for fixing the furnace. 8 . wall material.

8 . The CDQ waste heat utilization system integrated with primary dust removal according to claim 1 , wherein the flue gas outlet of the water-cooled cyclone separator is eccentrically arranged. 9 .