CN212818973U - Energy-saving water collection and pollutant treatment system for high-temperature water-washed slag exhaust steam - Google Patents
Energy-saving water collection and pollutant treatment system for high-temperature water-washed slag exhaust steam Download PDFInfo
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- CN212818973U CN212818973U CN202021597799.4U CN202021597799U CN212818973U CN 212818973 U CN212818973 U CN 212818973U CN 202021597799 U CN202021597799 U CN 202021597799U CN 212818973 U CN212818973 U CN 212818973U
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Abstract
The utility model provides an energy-conserving water and pollutant control system of receiving of high temperature water towards sediment exhaust steam, including high altitude granulation tower, towards sediment water entry, high temperature sediment entry, collection liquid device, spray set, mixed wind heating region, gas induced draft fan, towards the slag bath, spray water condensate water processing unit, exhaust steam bypass condenser, gaseous heat source unit, defroster and warm and humid acidimeter, towards the slag bath and the high altitude granulation tower bottom wall connection, spray water condensate water processing unit is connected with collection liquid device and spray set, and exhaust steam bypass condenser's entry is led out section A1 and is connected with high altitude granulation tower wall through exhaust steam bypass pipeline, and export and second defroster entry linkage, second defroster export is led back section A2 and is linked to each other with mixed wind heating region one side through exhaust steam bypass pipeline. The system 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
Technical Field
The utility model 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 collection and pollutant treatment system.
Background
In the metallurgical industry, about 80 percent of high-temperature slag generated by an iron-making blast furnace is cooled by adopting a water quenching mode. 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 tank, 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 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 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 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 whitening 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 high-temperature water flushing slag steam exhaust energy-saving water recovery and pollutant treatment system to meet the treatment requirements of the blast furnace water slag flushing system.
Disclosure of Invention
The utility model aims at solving the problem among the prior art, provide a water and pollutant treatment system are received in energy-conservation of high temperature water towards sediment exhaust steam, be applicable to the blast furnace towards the slag notch, towards comprehensive the treatment at exhaust steam production positions such as slag bath, can make the blast furnace towards the sediment exhaust steam and obtain deep purification, reduce the emission of acidic pollutants such as hydrogen sulfide, sulfur dioxide, realize towards sediment exhaust steam waste heat recovery and utilize to greatly reduce towards sediment system water consumption.
In order to achieve the purpose, the utility model 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 flushing water inlet, a high temperature slag inlet, a spraying device, a mixed air heating region and a mixed air draught fan, wherein the slag flushing water inlet, the high temperature slag inlet, the spraying device, the mixed air heating region and the mixed air draught fan are sequentially arranged on a tower body of the overhead granulating tower from bottom to top; the outlet of the dead steam bypass pipeline guiding-out section is connected with the inlet of the steam bypass condenser through a large-small head, the inlet of the steam bypass condenser is connected with the wall of the high-altitude granulation tower through a dead steam bypass pipeline guiding-out section A1, the joint is arranged above the spraying device, the outlet of the steam bypass condenser is connected with the inlet of a second demister, the outlet of the second demister is connected with the inlet of a dead steam bypass pipeline guiding-back section A2 through a large-small head, the outlet of the dead steam bypass pipeline guiding-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 condensate treatment unit comprises a filter, a conditioning and precipitating water tank, a dosing device, a spray water pump and a waste heat recovery device, wherein a liquid collecting device is arranged below the spray device, the inlet of the filter is connected with the outlet of the liquid collecting device through a pipeline, the liquid collecting device is a liquid collecting tray or a steam lifting and collecting tray, the outlet of the filter is connected with the inlet of the conditioning and precipitating water tank through a pipeline, the dosing device is connected with the top of the conditioning and precipitating water tank through an alkali agent pipeline F, the bottom of the conditioning and precipitating water tank is connected with the slag flushing tank through a condensate recovery pipeline E, a movable sealing cover is arranged above the slag flushing tank, the inlet of the spray water pump is connected with the lower part of the liquid level of the conditioning and precipitating water tank through a spray water pipeline, and the outlet of the spray water is connected with the spray water inlet of the waste heat, the waste heat recovery device spray water outlet is connected with the spray device spray water inlet through a spray water pipeline, the waste heat recovery device and the exhaust steam bypass condenser heat exchange tube are made of fluoroplastics, the pipe diameter of the fluoroplastics is 10-14 mm, the wall thickness of the fluoroplastics is 1mm, and the U-shaped arrangement is realized.
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 return 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 exhaust steam 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.
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 tray, 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 two 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 3-3.5 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, the cold media a of the waste heat recovery device and the steam exhaust bypass condenser are blast furnace wall cooling water, inlets of the waste heat recovery device and the steam exhaust bypass condenser are sequentially connected with the cold medium delivery pump and the first water replenishing tank through pipelines, outlets of the cold media a are connected with a blast furnace wall cooling system through pipelines, and the cold media of the waste heat recovery device and the steam exhaust bypass condenser can also be low-temperature air.
Preferably, a first electric shutter valve is arranged between the spraying device and the air mixing heating area, the first electric shutter valve is positioned above the joint of the steam exhaust bypass pipeline leading-out section A1 and the tower wall of the high-altitude granulation tower, a second electric shutter valve is arranged on the steam exhaust bypass pipeline leading-out section A1, a third electric shutter valve is arranged on the steam exhaust bypass pipeline leading-back section A2, and when the first electric shutter valve is closed and the second electric shutter valve and the third electric shutter valve are opened, the spraying device and the steam exhaust bypass condenser are operated in series; when the first electric shutter plate valve is opened, the second electric shutter plate valve and the third electric shutter plate valve are closed, the spraying device operates independently, and the high-temperature water flushing slag exhaust steam energy-saving water receiving and pollutant treating system can be flexibly switched according to different weather conditions such as winter, summer, clear weather and extreme severe weather.
Preferably, the dead steam bypass pipeline leading-out section A1 is obliquely arranged at an inclination angle of 10-15 degrees, so that condensed water condensed and separated by the dead steam bypass condenser can conveniently flow into the liquid collecting tray 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 treatment device further comprises a second water supplementing tank, the spraying water condensed water treatment unit comprises a dosing device and a spraying water pump, the second water supplementing tank is connected with a water inlet of the spraying device through the spraying water pump and provides spraying water for the spraying device, and the dosing device is connected with the top of the second water supplementing tank through an alkali agent pipeline F.
The utility model has the advantages that:
1. the utility model is a complete treatment system and a complete treatment method aiming at the slag flushing exhaust steam generating areas such as a slag flushing port, a slag flushing pool and the like of a blast furnace, and overcomes the defect of incomplete treatment range in the prior art;
2. the utility model realizes deep condensation treatment of the slag flushing exhaust steam, and complete elimination of visual pollution by means of a spraying device, an exhaust steam bypass condenser and mixed air reheating, thereby solving the environmental protection problem;
3. the utility model 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, sunny weather, extreme severe weather, and the like;
4. the utility model discloses a spray water condensate water processing unit carries out alkali medicament quenching and tempering to the spray water, can effectively prevent the acid corrosion of pipeline to effectively promote the spray water to wash the treatment of acid pollutants such as hydrogen sulfide, sulfur dioxide, hydrogen chloride in the sediment exhaust steam, reduce the pollutant and discharge, effectively collect the condensate water simultaneously, reduce and wash sediment system water consumption;
5. the utility model effectively recovers the low-grade waste heat of the slag flushing exhaust steam by using the cooling water or the low-temperature air of the blast furnace wall as the cold medium;
6. the utility model discloses make full use of blast furnace regional current heat source gas, blast furnace casting house environment dust pelletizing system exhaust hot flue gas promptly, also can be hot-blast furnace subassembly exhaust hot flue gas, as the reheat heat source of the slugging exhaust steam after the condensation, the reheating process is the energy consumption that does not newly increase.
The features and advantages of the present invention will be described in detail by embodiments with reference to the accompanying drawings.
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 granulation 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 spray device, 81-a first electric shutter plate valve, 82-a second electric shutter plate valve, 83-a second electric shutter plate valve, 9-a mixed air heating area, 10-a mixed air induced draft fan, 11-a slag flushing tank, 12-a movable sealing cover, 13-a spray water condensation water treatment unit, 131-a filter, 132-a precipitation water tank, 133-a medicine adding device, 134-a spray water pump, 135-a waste heat recovery device and 14-an exhaust steam bypass condenser, 15-gas heat source unit, 16-cold medium delivery pump, 17-first water supplement tank, 18-blast furnace wall cooling system, 136-second water supplement tank, 20-steam raising liquid collecting tray, 201-central baffle tray, 202-lower tray, 21-blower, 22-air inlet of hot blast furnace;
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
Example 1
Referring to fig. 1, the utility model relates to a high temperature water flushing slag exhaust steam energy-saving water collection and pollutant treatment system, including high altitude granulation tower 1, set gradually towards slag water entry 2, high temperature slag entry 3, spray set 7, mixed wind heating region 9, mixed gas induced draft fan 10 on the tower body of high altitude granulation tower 1 from bottom to top, still include towards slag bath 11, spray water condensate treatment unit 13, exhaust steam bypass condenser 14, gaseous heat source unit 15 and second defroster 42, spray water condensate treatment unit 13 links to each other with spray set 7, provides spray water for spray set 7 through the spray water pipeline, towards slag bath 11 through slag ditch C with high altitude granulation tower 1 bottom tower wall connection, towards slag bath 11 top through steam backflow pipeline D with high altitude granulation tower 1 tower wall connection; the outlet of the dead steam bypass pipeline guiding-out section A1 is connected with the inlet of the steam bypass condenser 14 through a reducer, the inlet of the steam bypass condenser 14 is connected with the tower wall of the high-altitude granulation tower 1 through a dead steam bypass pipeline guiding-out section A1, the joint is arranged above the spraying device 7, the outlet of the steam bypass condenser 14 is connected with the inlet of the second demister 42, the outlet of the second demister 42 is connected with the inlet of the dead steam bypass pipeline guiding-back section A2 through a reducer, the outlet of the dead steam bypass pipeline guiding-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 zone 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 condensate treatment unit 13 comprises a filter 131, a conditioning precipitation water tank 132, a dosing device 133, a spray water pump 134 and a waste heat recovery device 135, a liquid collecting device is arranged below the spray device 7, an inlet of the filter 131 is connected with an outlet of the liquid collecting device through a pipeline, an outlet of the filter 131 is connected with an inlet of the conditioning precipitation water tank 132 through a pipeline, the dosing device 133 is connected with the top of the conditioning precipitation water tank 132 through an alkali agent pipeline F, the bottom of the conditioning precipitation water tank 132 is connected with the slag flushing tank 11 through a condensate recovery pipeline E, a movable sealing cover 12 is arranged above the slag flushing tank 11, an inlet of the spray water pump 134 is connected with the liquid level below the precipitation water tank 132 through a spray water pipeline, an outlet of the spray water pump 134 is connected with a spray water inlet of the waste heat recovery device 135 through a spray water pipeline, waste heat recovery device 135 shower water export is connected with spray set 7 shower water entry through spray water pipeline, waste heat recovery device 135 with exhaust steam bypass condenser 14 heat exchange tubes are fluoroplastics, fluoroplastics' pipe diameter is 10~14mm, and the wall thickness is 1mm, and the U type is arranged.
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 discharging 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, the first demister 41 is positioned above the joint of the steam return 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 region 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.
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 two 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 3-3.5 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.
Further, the cold media a of the waste heat recovery device 135 and the exhaust steam bypass condenser 14 are blast furnace wall cooling water, inlets of the cold media a of the waste heat recovery device 135 and the exhaust steam bypass condenser 14 are sequentially connected with the cold medium delivery pump 16 and the first water replenishing tank 17 through pipelines, outlets of the cold media a are connected with the blast furnace wall cooling system 18 through pipelines, and the cold media a of the waste heat recovery device 13.5 and the exhaust steam bypass condenser 14 can also be low-temperature air.
Further, a first electric shutter valve 81 is arranged between the spraying device 7 and the air mixing heating area 9, the first electric shutter valve 81 is positioned above the joint of the steam exhaust bypass pipeline leading-out section A1 and the tower wall of the high-altitude granulation tower 1, a second electric shutter valve 82 is arranged on the steam exhaust bypass pipeline leading-out section A1, a third electric shutter valve 83 is arranged on the steam exhaust bypass pipeline leading-back section A2, and 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 steam exhaust bypass condenser 14 are operated in series; when the first electric shutter plate valve 81 is opened, the second electric shutter plate valve 82 and the third electric shutter plate valve 83 are closed, the spraying device 7 operates independently, and the high-temperature water-washed slag exhaust steam energy-saving water-receiving and pollutant treatment system can be flexibly switched according to different weather conditions such as winter, summer, clear weather and extreme severe weather.
Furthermore, the dead steam bypass pipeline leading-out section A1 is obliquely arranged at an inclination angle of 10-15 degrees, so that condensed water condensed and separated by the dead steam bypass condenser 14 can conveniently flow 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 the high-temperature slag from the high-temperature slag inlet 3 and the slag flushing water from the slag flushing water inlet 2 at the bottom of the high-altitude granulation tower 1 to generate high-temperature slag flushing exhaust steam; the slag-water mixture is conveyed to a slag flushing pool 11 through a slag ditch C, and high-temperature slag flushing exhaust steam generated in the slag flushing pool 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, transferring the high-temperature slag flushing exhaust steam generated at the bottom of the high-altitude granulation tower 1 upwards along the tower body of the high-altitude granulation tower 1, and entering the first demister 41 to perform 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 valve 81 is closed and the second electric shutter valve 82 and the third electric shutter 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 valve 8 is opened and the second electric shutter valve 82 and the third electric shutter valve 83 are closed, the slag flushing exhaust steam passing through the spraying device 7 continuously moves upwards along the tower body of the high-altitude granulation tower 1 and enters the mixing and heating area 9 after passing through the first electric shutter valve 81;
s6, the spray water and the condensed water in the liquid collecting tray 6 enter the spray water condensed water processing unit 13 through a pipeline, and enter the quality-adjusting precipitation water tank 132 after passing through the filter 131; the chemical adding device 133 inputs an alkali chemical into the quenching and tempering precipitation water tank 132 through an alkali chemical pipeline F to carry out quenching and 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 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 spray water pump 134 and a waste heat recovery device 135 in sequence, and then is conveyed back to the spray device 7 for recycling;
s7, a heat source from the gas heat source unit 15 enters the 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, cold medium a inlets of the waste heat recovery device 135 and the exhaust steam bypass condenser 14 are sequentially connected with the cold medium delivery pump 16 and the first water replenishing tank 17 through pipelines, and a cold medium a outlet is connected with the blast furnace wall cooling system 18 through a pipeline, so that the cyclic utilization of the cold medium is realized;
wherein, the first hygrothermograph 51, the second hygrothermograph 52 and the third hygrothermograph 53 monitor the slag flushing dead 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 2
Referring to fig. 2, the removing system of the present embodiment is a modification on the basis of embodiment 1: the first demister 41, the first hygrothermograph 51, the liquid collecting tray 6, and the filter 131, the conditioning and precipitating water tank 132, and the waste heat recovery device 135 in the spray water condensate treatment unit 13 in example 1 are eliminated, the chemical feeding device 133 and the spray water pump 134 of the spray water condensate treatment unit 13 in example 1 are retained, and the second water replenishing tank 136 is added.
Specifically, the spray water condensed water treatment unit 13 includes a dosing device 133 and a spray water pump 134, the second water replenishing tank 136 is connected with the water inlet of the spraying device 7 through the spray water pump 134 to provide spray water for the spraying device 7, and the dosing device 133 is connected with the top of the second water replenishing tank 136 through an alkali agent pipeline F.
The system flow of this embodiment is as follows:
s1, carrying out slag flushing operation on the high-temperature slag from the high-temperature slag inlet 3 and the slag flushing water from the slag flushing water inlet 2 at the bottom of the high-altitude granulation tower 1 to generate high-temperature slag flushing exhaust steam; the slag-water mixture is conveyed to a slag flushing pool 11 through a slag ditch C, and high-temperature slag flushing exhaust steam generated in the slag flushing pool 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, transferring high-temperature slag flushing exhaust steam generated at the bottom of the high-altitude granulation tower 1 upwards along the tower body of the high-altitude granulation tower 1, entering a spraying device 7 for primary condensation operation, collecting spraying water and condensed water at the bottom of the high-altitude granulation tower 1, and conveying the spraying water and the condensed water together with a slag-water mixture to a slag flushing pool 11 through a slag-water ditch C;
s3, the second water replenishing tank 136 is connected with the water inlet of the spraying device 7 through a pipeline and a spraying water pump 134 to provide spraying water for the spraying device 7; the chemical adding device 133 is connected with the top of the second water supplementing tank 136 through an alkali chemical pipeline F, and an alkali chemical is input into the second water supplementing tank 136, so that the supplementing water of the process water is alkalescent, 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 valve 81 is closed and the second electric shutter valve 82 and the third electric shutter 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 valve 8 is opened and the second electric shutter valve 82 and the third electric shutter valve 83 are closed, the slag flushing exhaust steam passing through the spraying device 7 continuously moves upwards along the tower body of the high-altitude granulation tower 1 and enters the mixing and heating area 9 after passing through the first electric shutter valve 81;
s6, a heat source from the gas heat source unit 15 enters the 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 cold medium a inlet of the dead steam bypass condenser 14 is sequentially connected with a cold medium delivery pump 16 and a first water replenishing tank 17 through pipelines, and a cold medium a outlet is connected with a blast furnace wall cooling system 18 through a pipeline, so that the cyclic utilization of the cold medium is realized.
Wherein, the second hygrothermograph 52 and the third hygrothermograph 53 monitor 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 removing 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 the liquid collecting tray 6, and the vapor lifting liquid collecting tray 20 is used for replacing the present embodiment;
specifically, the steam-raising liquid-collecting tray 20 comprises a central baffle tray 201 and a lower tray 202, the outer ring of the lower tray 202 is mounted on the inner wall of the tower body of the high-altitude granulation tower 1, the center of the lower tray 202 is provided with an exhaust funnel extending upwards, the exhaust funnel is in a circular truncated cone shape with a gradually decreasing cross section from bottom to top, an exhaust passage for discharging slag flushing steam is arranged in the exhaust funnel, the central baffle tray 201 is positioned right above the exhaust passage, the outer ring of the central baffle tray 201 is provided with a flow guide edge extending downwards, and the outer diameter of the central baffle tray 201 is larger than the outer diameter of the outlet end of the exhaust passage.
Secondly, the cooling medium a in embodiment 1 is blast furnace wall cooling water, inlets of the exhaust steam bypass condenser 14 and the waste heat recovery device 135 are sequentially connected with the cooling medium delivery pump 16 and the first water replenishing tank 17 through pipelines, and outlets of the exhaust steam bypass condenser and the waste heat recovery device 135 are connected with the blast furnace wall cooling system 18 through pipelines, so that the recycling of the cooling medium is realized; 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 waste heat recovery device 135 are connected with the blower 21 through pipelines, and the outlets of the cold medium a are connected with the air inlet 22 of the hot blast stove through pipelines, so that waste heat utilization is realized;
thirdly, on the basis of the second step, the heat exchange tubes of the waste heat recovery device 135 and the exhaust steam bypass condenser 14 in the embodiment 1 are made of fluoroplastic materials, the tube diameter is 10-14 mm, the wall thickness is 1mm, and the heat exchange tubes are arranged in a U shape; the waste heat recovery device 135 and the exhaust steam bypass condenser 14 in this embodiment may be replaced by various types: can be 2205 metal finned tubes, the tube diameter is not less than 38mm, the wall thickness is 3-5 mm, and the heat exchange tubes are arranged in an S shape; the heat exchange tube can be a TA2 light tube, the tube diameter is not less than 25mm, the wall thickness is 1-1.5 mm, and the heat exchange tube is arranged in an S shape; also can be fluoroplastic pipe, the pipe diameter is 50mm, and the wall thickness is 1mm, and the heat exchange tube U type is arranged.
The above-mentioned embodiment is right the utility model discloses an explanation, it is not right the utility model discloses a limited, any right the scheme after the simple transform of the utility model all belongs to the protection scope of the utility model.
Claims (9)
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 condensate treatment unit (13) comprises a filter (131), a conditioning and precipitating water tank (132), a dosing device (133), a spray water pump (134) and a waste 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 and collecting tray (20), the inlet of the filter (131) is connected with the outlet of the liquid collecting device through a spray water pipeline, the outlet of the filter (131) is connected with the inlet of the conditioning and precipitating water tank (132) through a spray water pipeline, the dosing device (133) is connected with the top of the conditioning and precipitating water tank (132) through an alkali agent pipeline F, the bottom of the conditioning and precipitating water tank (132) is connected with the slag flushing tank (11) through a condensate recovery pipeline E, a movable sealing cover (12) is arranged above the slag flushing tank (11), the inlet of the spray water pump (134) is connected with the lower part of the conditioning and precipitating water tank (132) through a spray water pipeline, the outlet of the spray water pump (134) is connected with a heat medium inlet of the waste heat recovery device (135) through a spray water pipeline, and the heat medium outlet of the waste heat recovery device (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: the cold medium a of the waste heat recovery device (135) and the exhaust steam bypass condenser (14) are both low-temperature water, the cold medium a inlets of the waste heat recovery device (135) and the exhaust steam bypass condenser (14) are sequentially connected with a cold medium delivery pump (16) and a first water replenishing tank (17) through pipelines, and the cold medium a outlets are 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 3, 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 dosing device (133), a spray water pump (134) and a second water supplementing tank (136), wherein the second water supplementing tank (136) is connected with a water inlet of the spray device (7) through the spray water pump (134) to provide spray water for the spray device (7), and the dosing device (133) is connected with the top of the second water supplementing tank (136) through an alkali agent pipeline F.
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| CN202021597799.4U CN212818973U (en) | 2020-08-05 | 2020-08-05 | Energy-saving water collection and pollutant treatment system for high-temperature water-washed slag exhaust steam |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112058011A (en) * | 2020-08-05 | 2020-12-11 | 浙江菲达环保科技股份有限公司 | High-temperature water-washed slag exhaust steam energy-saving water receiving and pollutant treating system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112058011A (en) * | 2020-08-05 | 2020-12-11 | 浙江菲达环保科技股份有限公司 | High-temperature water-washed slag exhaust steam energy-saving water receiving and pollutant treating system and method |
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