CN112058011A - High-temperature water-washed slag exhaust steam energy-saving water receiving and pollutant treating system and method - Google Patents

Abstract

The invention provides a high-temperature water-washed slag exhaust steam energy-saving water-collecting and pollutant-treating system and a method, the system comprises an overhead granulation tower, a slag-washing water inlet, a high-temperature slag inlet, a liquid collecting device, a spraying device, an air-mixing heating area, a mixed gas induced draught fan, a slag-washing pool, a spraying water condensate treatment unit, an exhaust steam bypass condenser, a gas heat source unit, a demister and a hygrothermograph, wherein the slag-washing pool is connected with the bottom tower wall of the overhead granulation tower, the spraying water condensate treatment unit is connected with the liquid collecting device and the spraying device, the inlet of the exhaust steam bypass condenser is connected with the wall of the overhead granulation tower through an exhaust steam bypass pipeline leading-out section A1, the outlet of the exhaust steam bypass condenser is connected with the inlet of a second demister, and the outlet of the second demister is connected with one side of the air-mixing heating area through. The method can deeply purify the blast furnace slag flushing exhaust steam, reduce the discharge amount of acid pollutants such as hydrogen sulfide and sulfur dioxide, realize the recovery and utilization of the slag flushing exhaust steam waste heat, and greatly reduce the water consumption of a slag flushing system.

Description

High-temperature water-washed slag exhaust steam energy-saving water receiving and pollutant treating system and method

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of colored smoke plume purification in the metallurgical industry, in particular to a high-temperature water-washed slag exhaust steam energy-saving water-receiving and pollutant treatment system and method.

[ background of the invention ]

In the metallurgical industry, water is often used as a cooling medium in the cooling process of high-temperature slag generated by industrial furnaces such as iron and steel blast furnaces and converters, colored copper smelting furnaces and aluminum melting furnaces, such as a blast furnace slag water quenching process, a converter slag hot smoldering process or a hot splashing process. Taking a blast furnace as an example, about 80% of blast furnace slag is quenched with water. About 0.3-0.4 ton blast furnace slag is produced per ton pig iron, and about 9-10 ton slag flushing water is consumed per ton slag. The slag flushing water can evaporate a large amount of slag flushing exhaust steam at the moment of contacting the high-temperature slag and in the process of conveying the slag flushing water to the slag flushing water pool, and takes away about 40 percent of heat of the high-temperature slag at the temperature of 80-100 ℃. In 2019, the blast furnace pig iron yield in China is 8.09 million tons, about 20 million tons of slag flushing water not only has a large amount of low-temperature waste heat resources, but also generates a large amount of low-pressure exhaust steam and dissipates about 0.85 million tons of slag flushing water. The discharged flushing slag exhaust steam contains a large amount of hydrogen sulfide, sulfur dioxide, hydrogen chloride, fiber cotton wool, silicate ultrafine particles and the like, and has great influence on the production environment. The water fog plume often exists in the production field, which harms the health of workers and causes serious corrosion to equipment and facilities in the blast furnace area. Therefore, the comprehensive treatment of the blast furnace slag flushing exhaust steam can eliminate white smoke in a blast furnace area, recover a large amount of water resources, improve the environment of the blast furnace area, weaken the corrosion of production equipment and reduce the emission of pollutants, and becomes a problem which is increasingly concerned by enterprises and society.

Since 2016, the requirements of treating colored smoke plume of industrial smoke in more than 30 provinces and cities and areas in China are met, and meanwhile, the practical conditions of severe haze and water resource shortage in northern areas of China further promote the technical progress in the field. For example, patent publication No. CN103060494B proposes a steam recovery type blast furnace slag flushing water system, which adopts a spraying mode to recover the exhaust steam generated at the slag flushing port, but does not consider smoke plume treatment and does not recover the exhaust steam of the slag flushing water tank; patent publication No. CN208667759U proposes a system for dedusting, dehydrating and eliminating white in a blast furnace water slag granulation tower, wherein the key technology adopts GGH to carry out heat exchange treatment on slag flushing exhaust steam before and after condensation treatment, but GGH equipment has a great risk of corrosion, and visual pollution cannot be thoroughly eliminated in winter; patent publication No. CN208883918U proposes a slag flushing water elimination and waste heat utilization system, and the key technology of the system carries out condensation treatment on dead steam generated by a slag flushing water pool, the treatment range is incomplete, and visual pollution cannot be thoroughly eliminated; patent publication No. CN209322919U proposes an environment-friendly white-eliminating treatment and waste heat utilization system for blast furnace slag, the key technology of the system is to use a heat exchanger and a spraying device in series to carry out condensation treatment on the waste steam of a slag flushing port and a slag flushing water tank, but the spraying system needs to supplement a large amount of new water, and the visual pollution cannot be thoroughly eliminated without a heating system; patent publication No. CN209348354U proposes a blast furnace slag flushing flue gas whitening integrated device, and the key technology of the device only mixes and heats slag flushing exhaust steam and cannot achieve the pollutant purification effect; patent publication No. CN209910414U proposes a de-whitening device, the key technology of which is to adopt a water cooler and an air cooler series connection mode to treat high-temperature and high-humidity flue gas or steam, and the problem of low heat exchange efficiency of the air cooler exists; patent publication No. CN210206387U proposes a self-heating flue gas white elimination device, the key technology of which adopts a white elimination tower to sequentially arrange a reheater and an air cooler from top to bottom, the flue gas cooling and reheating white elimination do not need extra heat, but the reheater has a serious risk of corrosion, the air cooler consumes a large amount of gas, and the pipeline arrangement is too complex; the patent application number 201910944801.6 provides a blast furnace slag flushing dead steam eliminating and waste heat recovering device, the key technology of which only carries out condensation treatment on dead steam generated at a slag flushing port, and the problems of incomplete treatment range, huge air condensation system, large air consumption and low heat source grade exist; the publication No. CN109457065A proposes a waste steam recovery system for slag flushing water of an iron-making blast furnace, and the key technology is that the waste steam condensation treatment of the slag flushing system is carried out by adopting the serial design of a spray device and a heat exchanger, the pollutant treatment effect is good, but circulating water used by the spray device and the heat exchanger is conveyed to a cooling tower to be directly cooled, and a large amount of low-temperature water resource energy waste is caused.

From the above analysis, although the prior art has provided methods for steam exhaust and white removal and waste heat recovery of a blast furnace slag flushing system, various defects in different degrees and aspects still need to be improved, and it is necessary to develop a relatively complete, energy-saving, efficient, economic and reliable system and method for energy-saving water recovery and pollutant treatment of high-temperature water-washed slag steam exhaust to meet the treatment requirements of the blast furnace water slag flushing system.

[ summary of the invention ]

The invention aims to solve the problems in the prior art, provides a system and a method for energy-saving water recovery and pollutant treatment of high-temperature water flushing slag exhaust steam, is suitable for treatment of steam generated by high-temperature slag treatment systems such as a blast furnace, a converter and an aluminum melting furnace, is particularly suitable for comprehensive treatment of exhaust steam generation parts such as a blast furnace slag flushing port and a slag flushing water pool, can deeply purify the blast furnace slag flushing exhaust steam, reduces discharge of acidic pollutants such as hydrogen sulfide and sulfur dioxide, realizes recycling of the slag flushing exhaust steam waste heat, and greatly reduces water consumption of a slag flushing system.

In order to achieve the aim, the invention provides a high-temperature water-washed slag exhaust steam energy-saving water-collecting and pollutant-treating system, which comprises an overhead granulating tower, a slag-washing water inlet, a high-temperature slag inlet, a spraying device, a mixed air heating area and a mixed air draught fan, wherein the slag-washing water inlet, the high-temperature slag inlet, the spraying device, the mixed air heating area and the mixed air draught fan are sequentially arranged on a tower body of the overhead granulating tower; the system also comprises a slag flushing tank, a spray water condensed water treatment unit, an exhaust steam bypass condenser, a gas heat source unit and a second demister; the spray water condensation water treatment unit is connected with a spray device, spray water is provided for the spray device through a spray water pipeline, the slag flushing pool is connected with the tower wall at the bottom of the high-altitude granulation tower through a slag water ditch C, and the side wall at the top of the slag flushing pool is connected with the tower wall of the high-altitude granulation tower through a steam backflow pipeline D; the inlet of the exhaust steam bypass condenser is connected with the wall of the high-altitude granulation tower through an exhaust steam bypass pipeline leading-out section A1, the joint is arranged above the spraying device, the outlet of the exhaust steam bypass condenser is connected with the inlet of a second demister, the outlet of the second demister is connected with the inlet of an exhaust steam bypass pipeline leading-back section A2 through a reducer, the outlet of the exhaust steam bypass pipeline leading-back section A2 is connected with the wall of the high-altitude granulation tower, and the joint is arranged on one side of the mixed air heating area; the gas heat source unit is connected with the wall of the high-altitude granulation tower through a gas heat source pipeline B, the joint is arranged on the other side of the air mixing heating area, specifically, the position opposite to the joint of the dead steam bypass pipeline guide-back section, and the mixed gas draught fan is arranged at the outlet of the air mixing heating area.

Preferably, the spray water condensation water treatment unit comprises a filter, a buffer water tank, a conditioning device, a circulating pump and a heat recoverer, a liquid collecting device is arranged below the spraying device, the liquid collecting device is a liquid collecting tray or a steam raising liquid collecting tray, the inlet of the filter is connected with the outlet of the liquid collecting device through a spraying water pipeline, the outlet of the filter is connected with the inlet of the buffer water tank through a spraying water pipeline, the conditioning device is connected with the top of the buffer water tank through an alkali agent pipeline F, the bottom of the buffer water tank is connected with the slag flushing water tank through a condensed water recovery pipeline E, a movable sealing cover is arranged above the slag flushing pool, the inlet of the circulating pump is connected with the lower part of the liquid level of the buffer water tank through a spray water pipeline, the outlet of the circulating pump is connected with a heat medium inlet of the heat recoverer through a spray water pipeline, and the heat medium outlet of the heat recoverer is connected with a spray water inlet of a spray device through a spray water pipeline; the heat recovery device and the heat exchange tube of the exhaust steam bypass condenser are made of fluoroplastics, the pipe diameter of each fluoroplastic is 10-14 mm, the wall thickness of each fluoroplastic is 0.8-1 mm, and the heat recovery device and the heat exchange tubes are arranged in a U shape.

Preferably, a first demister is arranged between the high-temperature slag inlet and the spraying device and is positioned above the joint of the steam reflux pipeline D and the high-altitude granulation tower; a third demister is arranged between the spraying device and the air mixing heating area and is positioned above the joint of the steam exhaust bypass pipeline leading-out section A1 and the high-altitude granulation tower; the first demister, the second demister and the third demister are not less than two layers and are ridge-type demisters.

Preferably, the system further comprises a first hygrothermograph, a second hygrothermograph and a third hygrothermograph, and is used for monitoring the temperature of the flushing steam in real time, the first hygrothermograph is arranged between the first demister and the liquid collecting device, the second hygrothermograph is arranged above the spraying device, and the third hygrothermograph is arranged at an outlet of the second demister.

Preferably, the spraying layers of the spraying device are not less than three layers and are arranged in the middle of the tower body of the high-altitude granulation tower, the interlayer spacing of the spraying layers of the spraying device is 3-5 m, a plurality of nozzles are uniformly arranged on each spraying layer, and the nozzles on two adjacent spraying layers are arranged in a staggered mode.

Preferably, cold media a of the heat recoverer and the exhaust steam bypass condenser are both low-temperature water, preferably blast furnace wall cooling water, cold media a inlets of the heat recoverer and the exhaust steam bypass condenser are both sequentially connected with a cold media delivery pump and a first water supplementing tank through pipelines, and cold media a outlets are both connected with a water inlet of a blast furnace wall cooling system through pipelines; the cold medium a of the heat recoverer and the dead steam bypass condenser can also be low-temperature air, the cold medium a inlets of the dead steam bypass condenser and the heat recoverer are connected with the air blower through pipelines, and the cold medium a outlets are connected with the air inlet of the hot blast stove through pipelines.

Preferably, a first electric shutter valve is arranged between the third demister and the air mixing heating area, a second electric shutter valve is arranged on the steam exhaust bypass pipeline leading-out section A1, and a third electric shutter valve is arranged on the steam exhaust bypass pipeline leading-back section A2; when the first electric shutter plate valve is closed, and the second electric shutter plate valve and the third electric shutter plate valve are opened, the spraying device and the exhaust steam bypass condenser are connected in series for operation; when the first electric shutter plate valve is opened, and the second electric shutter plate valve and the third electric shutter plate valve are closed, the spraying device operates independently; the high-temperature slag flushing exhaust steam energy-saving water collecting and pollutant treating system can be flexibly switched according to different weather conditions such as winter, summer, sunny weather, extreme severe weather and the like.

Preferably, the dead steam bypass pipeline leading-out section A1 and the dead steam bypass pipeline leading-back section A2 are arranged in an inclined or horizontal mode, the inclination angle is not more than 30 degrees, and condensed water condensed and separated by the dead steam bypass condenser conveniently flows into the liquid collecting device from top to bottom.

Preferably, the gas heat source unit is a blast furnace cast house environment dedusting system or a hot blast stove assembly.

Preferably, the spraying water condensation water treatment unit further comprises a slag flushing water supplementing tank, the spraying water condensation water treatment unit further comprises a tempering device, a circulating pump and a second water supplementing tank, the second water supplementing tank is connected with a water inlet of the spraying device through the circulating pump and provides spraying water for the spraying device, and the tempering device is connected with the top of the second water supplementing tank through an alkali agent pipeline F.

The invention also provides a high-temperature water-washed slag dead steam energy-saving water collection and pollutant treatment method, which comprises the following steps:

s1, carrying out slag flushing operation on high-temperature slag from a high-temperature slag inlet and slag flushing water from a slag flushing water inlet at the bottom of a high-altitude granulation tower to generate high-temperature slag flushing exhaust steam; the slag-water mixture is conveyed to a slag flushing water tank through a slag ditch C, and high-temperature slag flushing exhaust steam generated in the slag flushing water tank flows back to the bottom of the high-altitude granulation tower through an exhaust steam backflow pipeline D under the sealing action of a movable sealing cover;

s2, transferring high-temperature slag flushing exhaust steam generated at the bottom of the high-altitude granulation tower upwards along the tower body of the high-altitude granulation tower, and entering a first demister to perform primary demisting operation;

s3, continuously moving the high-temperature slag flushing exhaust steam passing through the first demister upwards along the tower body of the high-altitude granulation tower, entering a spraying device for primary condensation operation, and collecting spraying water and condensed water in a liquid collecting tray;

s4, under the conditions that the first electric shutter plate valve is closed and the second electric valves and the third electric shutter plate valve are opened, slag flushing exhaust steam passing through the spraying device migrates along an exhaust steam bypass pipeline leading-out section A1, enters an exhaust steam bypass condenser for secondary condensation operation, enters a second demister for secondary demisting operation after being condensed to a set temperature, then migrates along an exhaust steam bypass pipeline leading-back section A2, and is conveyed back to a mixed heating area at the top of the high-altitude granulation tower; the condensed water flows from top to bottom along the guiding-out section A1 of the dead steam bypass pipeline and is collected in the liquid collecting tray;

s5, under the condition that the first electric shutter plate valve is opened and the second electric valves and the third electric shutter plate valve are closed, the slag flushing exhaust steam of the spraying device continuously moves upwards along the tower body of the high-altitude granulation tower, enters a third demister to perform secondary demisting operation, and enters a mixing heating area after passing through the first electric shutter plate valve;

s6, enabling the spray water and the condensed water in the liquid collecting tray to enter a spray water condensed water treatment unit through a pipeline, and enabling the spray water and the condensed water to enter a buffer water tank after passing through a filter; the quenching and tempering device inputs an alkali medicament into the buffer water tank through an alkali medicament pipeline F to carry out quenching and tempering operation, so that spray water is alkalescent, and acid pollutants contained in the slag flushing exhaust steam can be removed more efficiently in the spraying and cooling process; conveying the condensed water subjected to hardening and tempering back to the slag flushing water tank through a condensed water recovery pipeline E for water supplementing operation; the spray water after the tempering is subjected to waste heat recovery operation through a circulating pump and a heat recoverer in sequence and then is conveyed back to the spraying device for recycling;

s7, a heat source from the gas heat source unit enters a mixing heating area through a gas heat source pipeline B, and is uniformly mixed with the slag flushing exhaust steam subjected to condensation purification treatment to form unsaturated hot mixed gas; the mixed gas continuously moves upwards along the tower body of the high-altitude granulation tower under the action of the mixed gas induced fan and is discharged through the outlet of the high-altitude granulation tower, and visual pollution is avoided;

s8, conveying a cold medium a required by condensing, flushing and exhausting steam to a heat recoverer and an exhausting steam bypass condenser by a first water replenishing tank through a cold medium conveying pump, and conveying the heated cold medium a to a water inlet of a blast furnace wall cooling system through a pipeline to realize the recycling of the cold medium;

s9, a first hygrothermograph, a second hygrothermograph and a third hygrothermograph are used for monitoring the condensation of the flushing waste steam to a set temperature in real time; the set temperature is the temperature corresponding to the reduction of 50% of the moisture content of the flushing slag dead steam.

The invention has the beneficial effects that:

1. the invention is a complete treatment system and a complete treatment method for slag flushing exhaust steam generating areas such as a slag flushing hole of a blast furnace, a slag flushing water pool and the like, and overcomes the defect of incomplete treatment range in the prior art;

2. according to the invention, through the spray device, the exhaust steam bypass condenser and the air mixing reheating mode, the deep condensation treatment of the slag flushing exhaust steam is realized, the complete elimination of visual pollution is realized, and the environmental protection problem is solved;

3. the invention can realize the series condensation operation of the spraying device and the exhaust steam bypass condenser or the independent condensation operation of the spraying device by controlling the electric louver valve, thereby realizing the flexible switching of different weather conditions such as winter, summer, clear weather, extreme severe weather and the like;

4. according to the invention, the spray water is subjected to alkali agent conditioning treatment by the spray water condensate treatment unit, so that the acidic corrosion of a pipeline can be effectively prevented, the treatment of acidic pollutants such as hydrogen sulfide, sulfur dioxide, hydrogen chloride and the like in the slag flushing exhaust steam by the spray water is effectively promoted, the pollutant emission is reduced, the condensate water is effectively collected, and the water consumption of a slag flushing system is reduced;

5. the invention uses the cooling water of the blast furnace wall or the low-temperature air as the cold medium, and effectively recovers the low-grade waste heat of the slag flushing exhaust steam;

6. the invention fully utilizes the existing heat source gas in the blast furnace area, namely the hot flue gas exhausted by the blast furnace casting house environment dust removal system, and also can be the hot flue gas exhausted by the hot blast stove component as the reheating heat source of the condensed slag flushing exhaust steam, and the reheating process does not increase energy consumption.

The features and advantages of the present invention will be described in detail by embodiments in conjunction with the accompanying drawings.

[ description of the drawings ]

FIG. 1 is a system diagram of an energy-saving waste steam recovery system with high-temperature water and slag and pollutant abatement in example 1.

FIG. 2 is a system diagram of the high-temperature water-washed slag exhaust steam energy-saving water-collecting and pollutant-treating system in example 2.

FIG. 3 is a system diagram of the high-temperature water-washed slag exhaust steam energy-saving water-collecting and pollutant treating system in example 3.

In the figure: 1-an overhead granulating tower, 2-a slag flushing water inlet, 3-a high-temperature slag inlet, 41-a first demister, 42-a second demister, 43-a third demister, 51-a first hygrothermograph, 52-a second hygrothermograph, 53-a third hygrothermograph, 6-a liquid collecting tray, 7-a spraying device, 81-a first electric shutter plate valve, 82-a second electric shutter plate valve, 83-a second electric shutter plate valve, 9-a wind mixing and heating area, 10-a mixed gas induced draft fan, 11-a slag flushing water tank, 12-a movable sealing cover, 13-a spray water condensation water processing unit, 131-a filter, 132-a buffer water tank, 133-a conditioning device, 134-a circulating pump, 135-a heat recoverer, 136-a second water supplementing tank, 14-an exhaust steam bypass condenser, 15-a gas heat source unit, 16-a cold medium delivery pump, 17-a first water replenishing tank, 18-a blast furnace wall cooling system, 19-a steam raising liquid collecting disc, 191-a central baffle disc, 192-a lower tray, 20-a blower and 21-a hot blast furnace air inlet;

a1-an exhaust steam bypass pipeline leading-out section, A2-an exhaust steam bypass pipeline leading-back section, B-a gas heat source pipeline, C-a slag ditch, D-an exhaust steam backflow pipeline, E-a condensed water recovery pipeline and F-an alkali agent pipeline;

a-a cold medium.

[ detailed description ] embodiments

Example 1

Referring to fig. 1, the high-temperature water-washed slag exhaust steam energy-saving water collecting and pollutant treating system comprises an overhead granulating tower 1, a slag-washing water inlet 2, a high-temperature slag inlet 3, a spraying device 7, a mixed air heating area 9 and a mixed air draught fan 10, wherein the slag-washing water inlet 2, the high-temperature slag inlet 3, the spraying device 7, the mixed air heating area 9 and the mixed air draught fan are sequentially arranged on a tower body of the overhead granulating tower 1 from; the system also comprises a slag flushing tank 11, a spray water condensed water treatment unit 13, an exhaust steam bypass condenser 14, a gas heat source unit 15 and a second demister 42; the spray water condensed water treatment unit 13 is connected with the spray device 7, spray water is provided for the spray device 7 through a spray water pipeline, the slag flushing pool 11 is connected with the bottom tower wall of the high-altitude granulation tower 1 through a slag water ditch C, and the top side wall of the slag flushing pool 11 is connected with the tower wall of the high-altitude granulation tower 1 through a steam backflow pipeline D; an inlet of the exhaust steam bypass condenser 14 is connected with the tower wall of the high-altitude granulation tower 1 through an exhaust steam bypass pipeline leading-out section A1, the joint is arranged above the spraying device 7, an outlet of the exhaust steam bypass condenser 14 is connected with an inlet of a second demister 42, an outlet of the second demister 42 is connected with an inlet of an exhaust steam bypass pipeline leading-back section A2 through a large head and a small head, an outlet of the exhaust steam bypass pipeline leading-back section A2 is connected with the tower wall of the high-altitude granulation tower 1, and the joint is arranged on one side of the mixed air heating area 9; the gas heat source unit 15 is connected with the tower wall of the high-altitude granulation tower 1 through a gas heat source pipeline B, the joint is arranged on the other side of the air mixing heating area 9, specifically, the position opposite to the joint of the exhaust steam bypass pipeline guide-back section A2, and the mixed gas draught fan 10 is arranged at the outlet of the air mixing heating area 9.

Further, the spray water condensation water treatment unit 13 comprises a filter 131, a buffer water tank 132, a conditioning device 133, a circulating pump 134 and a heat recovery device 135, a liquid collecting device is arranged below the spraying device 7, the inlet of the filter 131 is connected with the outlet of the liquid collecting device through a spraying water pipeline, the outlet of the filter 131 is connected with the inlet of the buffer water tank 132 through a spray water pipeline, the tempering device 133 is connected with the top of the buffer water tank 132 through an alkali agent pipeline F, the bottom of the buffer water tank 132 is connected with the slag flushing water tank 11 through a condensed water recovery pipeline E, a movable sealing cover 12 is arranged above the slag flushing pool 11, the inlet of the circulating pump 134 is connected with the lower part of the liquid level of the buffer water tank 132 through a spraying water pipeline, the outlet of the circulating pump 134 is connected with the heat medium inlet of the heat recoverer 135 through a spray water pipeline, the 135 heat medium outlet of the heat recoverer is connected with the spray water inlet of the spray device 7 through a spray water pipeline; the heat recovery device 135 and the heat exchange tube of the exhaust steam bypass condenser 14 are made of fluoroplastics, the pipe diameter of each fluoroplastic is 10-14 mm, the wall thickness of each fluoroplastic is 0.8-1 mm, and the fluoroplastics are arranged in a U shape.

Further, the liquid collecting device is a liquid collecting tray 6, the outer diameter of the liquid collecting tray 6 is smaller than the inner diameter of the tower body of the high-altitude granulation tower 1, a gap for upward migration of slag flushing steam is formed between the outer side of the liquid collecting tray 6 and the inner wall of the tower body of the high-altitude granulation tower 1, a discharge pipe is arranged at the bottom of the liquid collecting tray 6, and the outlet of the discharge pipe is connected with the filter 131.

Further, a first demister 41 is arranged between the high-temperature slag inlet 3 and the spraying device 7, and the first demister 41 is positioned above the connection part of the steam reflux pipeline D and the high-altitude granulation tower 1; a third demister 43 is arranged between the spraying device 7 and the air mixing heating area 9, and the third demister 43 is positioned above the joint of the exhaust steam bypass pipeline leading-out section A1 and the high-altitude granulation tower 1; the first demister 41, the second demister 42 and the third demister 43 are not less than two layers and are ridge-type.

Further, still include first hygrothermograph 51, second hygrothermograph 52 and third hygrothermograph 53 for real-time supervision dashes sediment steam temperature, first hygrothermograph 51 sets up between first defroster 41 and collecting tray 6, second hygrothermograph 52 sets up in the top of spray set 7, third hygrothermograph 53 sets up in the export of second defroster 42.

Furthermore, the spraying layers of the spraying device 7 are not less than three layers and are arranged in the middle of the tower body of the high-altitude granulation tower 1, the interlayer spacing of the spraying layers of the spraying device 7 is 3-5 m, a plurality of nozzles are uniformly arranged on each spraying layer, and the nozzles on two adjacent spraying layers are arranged in a staggered mode.

Furthermore, the cold media a of the heat recoverer 135 and the exhaust steam bypass condenser 14 are both low-temperature water, preferably blast furnace wall cooling water, inlets of the heat recoverer 135 and the exhaust steam bypass condenser 14 are both connected with the cold medium delivery pump 16 and the first water replenishing tank 17 through pipelines in sequence, and outlets of the cold media a are both connected with a water inlet of the blast furnace wall cooling system 18 through pipelines.

Further, a first electric shutter valve 81 is arranged between the third demister 43 and the air mixing heating area 9, a second electric shutter valve 82 is arranged on the steam exhaust bypass pipeline leading-out section A1, and a third electric shutter valve 83 is arranged on the steam exhaust bypass pipeline leading-back section A2; when the first electric shutter valve 81 is closed, and the second electric shutter valve 82 and the third electric shutter valve 83 are opened, the spraying device 7 and the exhaust steam bypass condenser 14 are operated in series; when the first electric shutter valve 81 is opened, the second electric shutter valve 82 and the third electric shutter valve 83 are closed, the spraying device 7 operates alone; the high-temperature slag flushing exhaust steam energy-saving water collecting and pollutant treating system can be flexibly switched according to different weather conditions such as winter, summer, sunny weather, extreme severe weather and the like.

Furthermore, the dead steam bypass pipeline leading-out section A1 and the dead steam bypass pipeline leading-back section A2 are arranged in an inclined or horizontal mode, the inclination angle is not more than 30 degrees, and condensed water condensed and separated by the dead steam bypass condenser 14 conveniently flows into the liquid collecting tray 6 from top to bottom.

Further, the gas heat source unit 15 is a blast furnace casting house environment dust removal system or a hot blast stove component.

A high-temperature water-washed slag exhaust steam energy-saving water-receiving and pollutant-treating method comprises the following steps:

s1, carrying out slag flushing operation on high-temperature slag from a high-temperature slag inlet 3 and slag flushing water from a slag flushing water inlet 2 at the bottom of a high-altitude granulation tower 1 to generate high-temperature slag flushing exhaust steam; the slag-water mixture is conveyed to a slag flushing water tank 11 through a slag water ditch C, and high-temperature slag flushing exhaust steam generated in the slag flushing water tank 11 flows back to the bottom of the high-altitude granulation tower 1 through an exhaust steam backflow pipeline D under the sealing action of a movable sealing cover 12;

s2, high-temperature slag flushing exhaust steam generated at the bottom of the high-altitude granulation tower 1 moves upwards along the tower body of the high-altitude granulation tower 1 and enters a first demister 41 to carry out primary demisting operation;

s3, continuously moving the high-temperature slag flushing exhaust steam passing through the first demister 41 upwards along the tower body of the high-altitude granulation tower 1, entering a spraying device 7 for primary condensation operation, and collecting spraying water and condensed water in a liquid collecting tray 6;

s4, under the conditions that the first electric shutter plate valve 81 is closed and the second electric valves 82 and the third electric shutter plate valve 83 are opened, the slag flushing exhaust steam passing through the spraying device 7 migrates along the exhaust steam bypass pipeline leading-out section A1, enters the exhaust steam bypass condenser 14 for secondary condensation operation, enters the second demister 42 for secondary demisting operation after being condensed to a set temperature, migrates along the exhaust steam bypass pipeline leading-back section A2, and is conveyed back to the mixing heating area 9 at the top of the high-altitude granulation tower 1; the condensed water flows from top to bottom along the guiding-out section A1 of the dead steam bypass pipeline and is collected in the liquid collecting tray 6;

s5, under the condition that the first electric shutter plate valve 8 is opened and the second electric valves 82 and the third electric shutter plate valve 83 are closed, the slag flushing exhaust steam of the spraying device 7 continuously moves upwards along the tower body of the high-altitude granulation tower 1, enters the third demister 43 for secondary demisting operation, and enters the mixing heating area 9 after passing through the first electric shutter plate valve 81;

s6, the spray water and the condensed water in the liquid collecting tray 6 enter the spray water condensed water treatment unit 13 through a pipeline, pass through a filter 131 and then enter a buffer water tank 132; the tempering device 133 inputs an alkali agent into the buffer water tank 132 through an alkali agent pipeline F to perform tempering operation, so that the spray water is in alkalescence, and acid pollutants contained in the flushing slag exhaust steam can be removed more efficiently in the spraying and cooling process; the condensed water after the hardening and tempering is conveyed back to the slag flushing water pool 11 through a condensed water recovery pipeline E for water supplementing operation; the spray water after the conditioning is subjected to waste heat recovery operation through a circulating pump 134 and a heat recoverer 135 in sequence, and then is conveyed back to the spraying device 7 for recycling;

s7, a heat source from the gas heat source unit 15 enters a mixing and heating area 9 through a gas heat source pipeline B, and is uniformly mixed with the slag flushing exhaust steam subjected to condensation purification treatment to form unsaturated hot mixed gas; the mixed gas continuously moves upwards along the tower body of the high-altitude granulation tower 1 under the action of the mixed gas induced draft fan 10, is discharged through the outlet of the high-altitude granulation tower 1, and has no visual pollution;

s8, conveying a cold medium a required by condensing, flushing and exhausting steam to the heat recoverer 135 and the exhausting steam bypass condenser 14 by the first water replenishing tank 17 through the cold medium conveying pump 16, and conveying the heated cold medium a to a water inlet of a blast furnace wall cooling system 18 through a pipeline to realize the recycling of the cold medium;

s9, a first hygrothermograph 51, a second hygrothermograph 52 and a third hygrothermograph 53 are used for monitoring the condensation of the flushing waste steam to a set temperature in real time; the set temperature is the temperature corresponding to the reduction of 50% of the moisture content of the flushing slag dead steam.

Example 2

Referring to fig. 2, the abatement system of the present embodiment is modified based on embodiment 1 as follows:

first, the first demister 41, the first hygrothermograph 51, and the drip tray 6 in example 1 are eliminated;

second, the spray water condensate treating unit 13 of the present embodiment replaces the spray water condensate treating unit 13 of embodiment 1 with a conditioning device 133, a circulation pump 134, and a second makeup tank 136.

Specifically, the spray water condensed water processing unit 13 includes a conditioning device 133, a circulation pump 134 and a second water supply tank 136, the second water supply tank 136 is connected to the water inlet of the spraying device 7 through the circulation pump 134 to provide spray water for the spraying device 7, and the conditioning device 133 is connected to the top of the second water supply tank 136 through an alkali agent pipeline F.

The system flow of this embodiment is as follows:

s1, carrying out slag flushing operation on high-temperature slag from a high-temperature slag inlet 3 and slag flushing water from a slag flushing water inlet 2 at the bottom of a high-altitude granulation tower 1 to generate high-temperature slag flushing exhaust steam; the slag-water mixture is conveyed to a slag flushing water tank 11 through a slag water ditch C, and high-temperature slag flushing exhaust steam generated in the slag flushing water tank 11 flows back to the bottom of the high-altitude granulation tower 1 through an exhaust steam backflow pipeline D under the sealing action of a movable sealing cover 12;

s2, high-temperature slag flushing exhaust steam generated at the bottom of the high-altitude granulation tower 1 moves upwards along the tower body of the high-altitude granulation tower 1, enters a spraying device 7 to carry out primary condensation operation, and is collected at the bottom of the high-altitude granulation tower 1 together with spray water and condensation water and conveyed to a slag flushing water pool 11 through a slag water ditch C;

s3, a second water replenishing tank 136 is connected with a water inlet of the spraying device 7 through a pipeline and a circulating pump 134 to provide spraying water for the spraying device 7; the tempering device 133 is connected with the top of the second water replenishing tank 136 through an alkali agent pipeline F, and an alkali agent is input into the second water replenishing tank 136, so that the process water is slightly alkaline, and the acid pollutants contained in the flushing slag exhaust steam can be removed more efficiently in the spraying and cooling process;

s4, under the conditions that the first electric shutter plate valve 81 is closed and the second electric valves 82 and the third electric shutter plate valve 83 are opened, the slag flushing exhaust steam passing through the spraying device 7 migrates along the exhaust steam bypass pipeline leading-out section A1, enters the exhaust steam bypass condenser 14 for secondary condensation operation, enters the second demister 42 for secondary demisting operation after being condensed to a set temperature, migrates along the exhaust steam bypass pipeline leading-back section A2, and is conveyed back to the mixing heating area 9 at the top of the high-altitude granulation tower 1; the condensed water flows from top to bottom along the guiding-out section A1 of the dead steam bypass pipeline and is collected at the bottom of the high-altitude granulation tower 1;

s5, under the condition that the first electric shutter plate valve 8 is opened and the second electric valves 82 and the third electric shutter plate valve 83 are closed, the slag flushing exhaust steam of the spraying device 7 continuously moves upwards along the tower body of the high-altitude granulation tower 1, enters the third demister 43 for secondary demisting operation, and enters the mixing heating area 9 after passing through the first electric shutter plate valve 81;

s6, a heat source from the gas heat source unit 15 enters a mixing and heating area 9 through a gas heat source pipeline B, and is uniformly mixed with the slag flushing exhaust steam subjected to condensation purification treatment to form unsaturated hot mixed gas; the mixed gas continuously moves upwards along the tower body of the high-altitude granulation tower 1 under the action of the mixed gas induced draft fan 10, is discharged through the outlet of the high-altitude granulation tower 1, and has no visual pollution;

s7, a first water supplementing tank 17 supplies cold medium a to the exhaust steam bypass condenser 14 through a cold medium conveying pump 16 and a first water supplementing tank (17) supplies the heated cold medium a to a water inlet connected with a blast furnace wall cooling system 18 through a pipeline, so that the cyclic utilization of the cold medium is realized;

s8, a second hygrothermograph 52 and a third hygrothermograph 53 are used for monitoring the slag flushing exhaust steam to be condensed to a set temperature in real time; the set temperature is the temperature corresponding to the reduction of 50% of the moisture content of the flushing slag dead steam.

Example 3

Referring to fig. 3, the abatement system of the present embodiment is modified based on embodiment 1 as follows:

firstly, the spray water and condensed water collecting device in embodiment 1 is a liquid collecting tray 6, and the vapor lifting liquid collecting tray 19 is used for replacement in this embodiment;

specifically, the steam-raising liquid-collecting tray 19 comprises a central baffle plate 191 and a lower tray 192, the outer ring of the lower tray 192 is mounted on the inner wall of the tower body of the high-altitude granulation tower 1, the center of the lower tray 192 is provided with an exhaust funnel which extends upwards, the section of the exhaust funnel is in a circular truncated cone shape which gradually decreases from bottom to top, an exhaust channel for upward migration of slag flushing steam is arranged in the exhaust funnel, the central baffle plate 191 is positioned right above the exhaust channel, the outer ring of the central baffle plate 191 is provided with a flow guide edge which extends downwards, and the outer diameter of the central baffle plate 191 is larger than the outer diameter of the outlet end of the exhaust channel.

Secondly, the cold medium a in the embodiment 1 is blast furnace wall cooling water, inlets of the dead steam bypass condenser 14 and the cold medium a of the heat recoverer 135 are sequentially connected with the cold medium delivery pump 16 and the first water replenishing tank 17 through pipelines, and outlets of the dead steam bypass condenser and the heat recoverer are connected with the blast furnace wall cooling system 18 through pipelines, so that the cold medium is recycled; in the embodiment, the cold medium a is replaced by low-temperature air, the inlets of the dead steam bypass condenser 14 and the cold medium a of the heat recoverer 135 are connected with the blower 20 through pipelines, and the outlets of the cold medium a are connected with the air inlet 21 of the hot blast stove through pipelines, so that the utilization of waste heat is realized;

thirdly, on the basis of the second step, the heat recovery device 135 and the exhaust steam bypass condenser 14 in the embodiment 1 are made of fluoroplastic materials, the pipe diameter is 10-14 mm, the wall thickness is 0.8-1 mm, and the heat exchange pipes are arranged in a U shape; the heat recovery 135 and the exhaust steam bypass condenser 14 in this embodiment may be replaced by various types: the heat exchange tube can be a metal finned tube, the tube diameter is not less than 38mm, the wall thickness is 3-5 mm, and the heat exchange tubes are arranged in a tube array manner; the heat exchange tube can be a titanium tube, the diameter of the tube is not less than 25mm, the wall thickness of the tube is 1-1.5 mm, and the heat exchange tubes are arranged in a tube type; or a fluoroplastic pipe with the pipe diameter not more than 50mm and the wall thickness of 1mm, and the heat exchange tubes are arranged in a tubular manner.

The above embodiments are illustrative of the present invention, and are not intended to limit the present invention, and any simple modifications of the present invention are within the scope of the present invention.

Claims (10)

1. The utility model provides an energy-conserving water and pollutant treatment system of receiving of high temperature water flushing sediment exhaust steam which characterized in that: comprises an overhead granulating tower (1), a slag flushing water inlet (2), a high-temperature slag inlet (3), a spraying device (7), a mixed air heating area (9) and a mixed air draught fan (10), which are arranged on a tower body of the overhead granulating tower (1) from bottom to top in sequence; the system also comprises a slag flushing pool (11), a spray water condensed water treatment unit (13), an exhaust steam bypass condenser (14), a gas heat source unit (15) and a second demister (42); the spray water condensed water treatment unit (13) is connected with the spray device (7), spray water is provided for the spray device (7) through a spray water pipeline, the slag flushing tank (11) is connected with the tower wall at the bottom of the high-altitude granulation tower (1) through a slag water ditch C, and the side wall at the top of the slag flushing tank (11) is connected with the tower wall of the high-altitude granulation tower (1) through a steam backflow pipeline D; an inlet of the exhaust steam bypass condenser (14) is connected with the tower wall of the high-altitude granulation tower (1) through an exhaust steam bypass pipeline leading-out section A1, the joint is arranged above the spraying device (7), an outlet of the exhaust steam bypass condenser (14) is connected with an inlet of a second demister (42), an outlet of the second demister (42) is connected with an inlet of an exhaust steam bypass pipeline leading-back section A2, an outlet of the exhaust steam bypass pipeline leading-back section A2 is connected with the tower wall of the high-altitude granulation tower (1), and the joint is arranged on one side of the air mixing heating area (9); the gas heat source unit (15) is connected with the tower wall of the high-altitude granulation tower (1) through a gas heat source pipeline B, the joint is arranged on the other side of the air mixing heating area (9), and the mixed gas induced draft fan (10) is arranged at the outlet of the air mixing heating area (9).

2. The high-temperature water-washed-slag dead steam energy-saving water-receiving and pollutant-treating system as claimed in claim 1, wherein: the spray water condensed water treatment unit (13) comprises a filter (131), a buffer water tank (132), a conditioning device (133), a circulating pump (134) and a heat recovery device (135), wherein a liquid collecting device is arranged below the spray device (7), the liquid collecting device is a liquid collecting tray (6) or a steam lifting liquid collecting tray (20), an inlet of the filter (131) is connected with an outlet of the liquid collecting device through a spray water pipeline, an outlet of the filter (131) is connected with an inlet of the buffer water tank (132) through a spray water pipeline, the conditioning device (133) is connected with the top of the buffer water tank (132) through an alkali agent pipeline F, the bottom of the buffer water tank (132) is connected with the slag flushing water tank (11) through a condensed water recovery pipeline E, a movable sealing cover (12) is arranged above the slag flushing tank (11), and an inlet of the circulating pump (134) is connected with the lower part of a liquid level water pipeline of the buffer water tank (132), an outlet of the circulating pump (134) is connected with a heat medium inlet of the heat recoverer (135) through a spray water pipeline, and a heat medium outlet of the heat recoverer (135) is connected with a spray water inlet of the spray device (7) through a spray water pipeline.

3. The high-temperature water-washed-slag dead steam energy-saving water-receiving and pollutant-treating system as claimed in claim 2, wherein: a first demister (41) is also arranged between the high-temperature slag inlet (3) and the spraying device (7), and the first demister (41) is positioned above the joint of the steam reflux pipeline D and the high-altitude granulation tower (1); a third demister (43) is also arranged between the spraying device (7) and the air mixing heating area (9), and the third demister (43) is positioned above the joint of the exhaust steam bypass pipeline guide-out section A1 and the high-altitude granulation tower (1); the first demister (41), the second demister (42) and the third demister (43) are not less than two layers.

4. The high-temperature water-washed-slag dead steam energy-saving water-receiving and pollutant-treating system as claimed in claim 3, wherein: still include first warm and humid acidimeter (51), second warm and humid acidimeter (52) and third warm and humid acidimeter (53) for real-time supervision dashes sediment steam temperature, first warm and humid acidimeter (51) sets up between first defroster (41) and the liquid collecting device, second warm and humid acidimeter (52) set up in the top of spray set (7), third warm and humid acidimeter (53) set up in the export of second defroster (42).

5. The high-temperature water-washed-slag dead steam energy-saving water-receiving and pollutant-treating system as claimed in claim 1, wherein: the spraying layers of the spraying device (7) are not less than three layers and are arranged in the middle of the tower body of the high-altitude granulation tower (1).

6. The high-temperature water-washed-slag dead steam energy-saving water-receiving and pollutant-treating system as claimed in claim 2, wherein: cold media a of the heat recoverer (135) and the exhaust steam bypass condenser (14) are both low-temperature water, inlets of the heat recoverer (135) and the exhaust steam bypass condenser (14) are both connected with a cold medium delivery pump (16) and a first water replenishing tank (17) through pipelines in sequence, and outlets of the cold media a are both connected with a water inlet of a blast furnace wall cooling system (18) through pipelines.

7. The high-temperature water-washed-slag dead steam energy-saving water-receiving and pollutant-treating system as claimed in claim 1, wherein: a first electric shutter valve (81) is arranged between the third demister (43) and the air mixing heating area (9), a second electric shutter valve (82) is arranged on the steam exhaust bypass pipeline leading-out section A1, and a third electric shutter valve (83) is arranged on the steam exhaust bypass pipeline leading-back section A2; when the first electric shutter valve (81) is closed, and the second electric shutter valve (82) and the third electric shutter valve (83) are opened, the spraying device (7) and the exhaust steam bypass condenser (14) are operated in series; when the first electric shutter valve (81) is opened, the second electric shutter valve (82) and the third electric shutter valve (83) are closed, the spraying device (7) operates alone.

8. The high-temperature water-washed-slag dead steam energy-saving water-receiving and pollutant-treating system as claimed in claim 1, wherein: the dead steam bypass pipeline guiding-out section A1 and the dead steam bypass pipeline guiding-back section A2 are arranged in an inclined or horizontal mode, and the inclination angle is not more than 30 degrees.

9. The high-temperature water-washed-slag dead steam energy-saving water-receiving and pollutant-treating system as claimed in claim 1, wherein: the spray water condensed water treatment unit (13) comprises a conditioning device (133), a circulating pump (134) and a second water supplementing tank (136), wherein the second water supplementing tank (136) is connected with a water inlet of the spraying device (7) through the circulating pump (134) to provide spray water for the spraying device (7), and the conditioning device (133) is connected with the top of the second water supplementing tank (136) through an alkali agent pipeline F.

10. The treatment method of the high-temperature water-washed-slag dead steam energy-saving water-receiving and pollutant treatment system according to any one of claims 1 to 8 is characterized in that: the method comprises the following steps:

s1, carrying out slag flushing operation on high-temperature slag from a high-temperature slag inlet (3) and slag flushing water from a slag flushing water inlet (2) at the bottom of a high-altitude granulation tower (1) to generate high-temperature slag flushing exhaust steam; the slag-water mixture is conveyed to a slag flushing water tank (11) through a slag ditch C, and high-temperature slag flushing exhaust steam generated in the slag flushing water tank (11) flows back to the bottom of the high-altitude granulation tower (1) through an exhaust steam backflow pipeline D under the sealing action of a movable sealing cover (12);

s2, high-temperature slag flushing exhaust steam generated at the bottom of the high-altitude granulation tower (1) moves upwards along the tower body of the high-altitude granulation tower (1) and enters a first demister (41) to carry out primary demisting operation;

s3, continuously moving the high-temperature slag flushing exhaust steam passing through the first demister (41) upwards along the tower body of the high-altitude granulation tower (1), entering a spraying device (7) for primary condensation operation, and collecting spraying water and condensed water in a liquid collecting tray (6);

s4, under the conditions that a first electric shutter plate valve (81) is closed and a second electric valve (82) and a third electric shutter plate valve (83) are opened, slag flushing exhaust steam of a spraying device (7) migrates along an exhaust steam bypass pipeline leading-out section A1, enters an exhaust steam bypass condenser (14) for secondary condensation operation, enters a second demister (42) for secondary demisting operation after being condensed to a set temperature, migrates along an exhaust steam bypass pipeline leading-back section A2, and is conveyed back to a mixing heating area (9) at the top of the high-altitude granulation tower (1); the condensed water flows from top to bottom along the guiding-out section A1 of the dead steam bypass pipeline and is collected in the liquid collecting tray (6);

s5, under the condition that the first electric shutter plate valve (8) is opened and the second electric valves (82) and the third electric shutter plate valve (83) are closed, the slag flushing exhaust steam of the spraying device (7) continuously moves upwards along the tower body of the high-altitude granulation tower (1), enters a third demister (43) for secondary demisting operation, and enters a mixed heating area (9) after passing through the first electric shutter plate valve (81);

s6, the spray water and the condensed water in the liquid collecting tray (6) enter a spray water condensed water treatment unit (13) through a pipeline, pass through a filter (131) and then enter a buffer water tank (132); the conditioning device (133) inputs an alkali medicament into the buffer water tank (132) through an alkali medicament pipeline F to perform conditioning operation, so that spray water is weakly alkaline; the condensed water after the hardening and tempering is conveyed back to the slag flushing water tank (11) through a condensed water recovery pipeline E for water supplementing operation; the spray water after the tempering is subjected to waste heat recovery operation through a circulating pump (134) and a heat recoverer (135) in sequence and then is conveyed back to the spraying device (7) for recycling;

s7, a heat source from the gas heat source unit (15) enters a mixing heating area (9) through a gas heat source pipeline B, and is uniformly mixed with the slag flushing exhaust steam subjected to condensation purification treatment to form unsaturated hot mixed gas; the mixed gas continuously moves upwards along the tower body of the high-altitude granulation tower (1) under the action of the mixed gas induced draft fan (10) and is discharged through the outlet of the high-altitude granulation tower (1);

s8, a first water replenishing tank (17) conveys a cold medium a required by condensing slag flushing exhaust steam to a heat recoverer (135) and an exhaust steam bypass condenser (14) through a cold medium conveying pump (16), and the heated cold medium a is conveyed to a water inlet of a blast furnace wall cooling system (18) through a pipeline to realize the cyclic utilization of the cold medium;

s9, a first hygrothermograph (51), a second hygrothermograph (52) and a third hygrothermograph (53) are used for monitoring the condensation of the slag flushing exhaust steam to a set temperature in real time; the set temperature is the temperature corresponding to the reduction of 50% of the moisture content of the flushing slag dead steam.

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