CN104988257B - Blast furnace slag washing water waste heat recovery system - Google Patents
Blast furnace slag washing water waste heat recovery system Download PDFInfo
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- CN104988257B CN104988257B CN201510481607.0A CN201510481607A CN104988257B CN 104988257 B CN104988257 B CN 104988257B CN 201510481607 A CN201510481607 A CN 201510481607A CN 104988257 B CN104988257 B CN 104988257B
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Abstract
The invention relates to a blast furnace slag washing water waste heat recovery system and belongs to the field of blast furnace slag washing water waste heat recovery technologies. The blast furnace slag washing water waste heat recovery system comprises a slag water lifting pump, flash evaporators, a vacuum pump, a hot water pump and a slag washing water return pump. The slag water lifting pump is connected with the flash evaporators. One end of the slag washing water return pump is connected with the flash evaporators, and the other end of the slag washing water return pump is connected with a blast furnace slag washing water system. The flash evaporators are of a sealed structure. Each flash evaporator comprises a slag washing water storage pool, a foam removing device, a hot water storage pool, a spraying device and a demister. The flash evaporators are arranged in two stages. The pressure in the first-stage evaporator is higher than that in the second-stage evaporator. The slag washing water lifting pump is connected with the first-stage flash evaporator. The first-stage flash evaporator is connected with the second-stage flash evaporator through a pipeline. According to the blast furnace slag washing water waste heat recovery system, blast furnace slag washing water flash steam and heating hot water are directly mixed and conduct heat exchange, the heat exchange efficiency is high, an wall-type heat exchange face is not needed, equipment will not generate scale or be corroded, and the system is low in investment and reliable in operation.
Description
Technical field
The invention belongs to blast furnace slag quenching water heat recovery technology field, is related to a kind of waste heat recovery system of blast furnace slag quenching water.
Background technology
Blast furnace high-temperature slag generally adopts Water Quenching, a large amount of 80 DEG C or so of washing slag water will be produced during being somebody's turn to do, at present
This part hot water carries out lowering the temperature Posterior circle for blast furnace slag flushing natural cooling or by way of forcing cooling, causes huge
Energy dissipation.
It is that, using this part of waste heat, extracting washing slag water heat by dividing wall type heat exchanger in prior art is used to produce heating
Water, bathroom water or desalinization etc..Conventional dividing wall type heat exchanger has plate type heat exchanger and shell-and-tube heat exchanger etc., is strong
Change the heat exchange between washing slag water and hot water, it is often necessary to great heat exchange area, thus cause system investments higher.And due to
The features such as washing slag water has high rigidity, high impurity content, weak erosive causes conventional dividing wall type heat exchanger burn into blocking easily occur
The problems such as.After flushing cinder water filter is by washing slag water filtration treatment, pulp water quality is obtained certain improvement, but can bring and be
The problems such as increase is damaged in system flowing resistance, Filter Back Washing is frequent.Therefore, existing exhaust heat of slag flushing water recovery system invests for the first time height,
And need regular heat exchanger and pulp water filter to be cleaned, changed, operating cost is higher.
Therefore, be badly in need of at present one kind can effectively solving washing slag water corrosion and scaling, and more than the washing slag water that can be run steadily in the long term
Heat reclamation device and system, to realize the purpose of system high efficiency rate, low cost, long-life operation.
The content of the invention
In view of this, it is an object of the invention to provide a kind of waste heat recovery system of blast furnace slag quenching water, the system is by height
Stove washing slag water flash-off steam and the direct mixed heat transfer of heating hot water, heat exchange efficiency is high, it is not necessary to which wall-type heat exchange face, equipment will not
Generation fouling, corrosion, system investments are low, reliable.
To reach above-mentioned purpose, the present invention provides following technical scheme：
A kind of waste heat recovery system of blast furnace slag quenching water, including pulp water elevator pump, flash vessel, vavuum pump, heat-exchanger pump and flushing cinder
Water back water pump；
The pulp water elevator pump is connected with the flash vessel, and described washing slag water back water pump one end is connected with flash vessel, another
End is connected with blast furnace slag flushing water system；
The flash vessel be closed structure, including washing slag water cistern, demister, hot water cistern, spray equipment and
Demister；Flash vessel point two stage arrangement, pressure is higher than pressure in two-stage flash device in primary flash device；The washing slag water elevator pump
It is connected with the primary flash device, primary flash device is connected with two-stage flash device by pipeline, control valve is set on pipeline；Punching
Pulp water sequentially passes through primary flash device and two-stage flash device, and heating hot water sequentially passes through two-stage flash device and primary flash device.
Further, pressure is detected by pressure sensor in the flash vessel, and maintains the flash distillation by the vavuum pump
Pressure is constant in device.
The beneficial effects of the present invention is：
Compared to prior art, preferably, mixing with heating water after condensation can for the steam quality that the system washing slag water is flashed off
Reduce the new water magnitude of recruitment of heating water.For can pass through with washing slag water cistern, the connecting line of washing slag water directly contact etc.
Special preservative treatment reaches corrosion-resistant purpose.The system without dividing wall type heat-transfer surface, therefore weight of equipment due to being far below and adopting
The weight of the washing slag water heat transmission equipment of dividing wall type heat exchanger, system investments are relatively low.And the system washing slag water flow resistance is little, when being
Vavuum pump primarily serves the effect of incoagulable gas in the system of extracting after the normal operation of system, and its power consumption is less, therefore system operation
Low cost.
Description of the drawings
In order that the purpose of the present invention, technical scheme and beneficial effect are clearer, the present invention provides drawings described below and carries out
Explanation：
Fig. 1 is the structural representation of the system；
Wherein：1. washing slag water flash distillation cistern；2. washing slag water elevator pump；3. primary flash device；4. demister；5. hot water stores
Pond；6. spray equipment；7. demister；8. hot water outlet；9.1# vavuum pump；10. heat-exchanger pump；11. hot water inlets；12.2# is true
Empty pump；13. two-stage flash devices；14. washing slag water back water pumps；15. regulating valves；16. pressure sensors.
Specific embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
Fig. 1 for the system structural representation, as shown in figure 1, from blast furnace slag flushing system～80 DEG C of washing slag water leads to
The washing slag water cistern 1 that pulp water elevator pump 2 is delivered in primary flash device 3 is crossed, the pressure in primary flash device 3 passes through pressure sensing
Vavuum pump 9 is monitored and fed back to device 16, adjusts and maintain the pressure in primary flash device 3 left in 31.2kPa by vavuum pump 9
It is right.Washing slag water enters rapid flash distillation after primary flash device 3, and flash-off steam mean temperature is up to more than 70 DEG C.Flash-off steam is upwards
Motion, removes the hot water (～58 DEG C) sprayed with spray equipment 6 after impurity and mechanical water in steam and is connect by demister 4
Touch heat exchange.Be heated after hot water (>65 DEG C) and flash-off steam condensate liquid together flow in hot water cistern 5.Hot water leads to again
Overheated water out 8 delivers to pipe network heat user.Can be by the washing slag water in primary flash device washing slag water cistern by washing slag water flash distillation
Temperature is down to～70 DEG C.There is no the washing slag water of flash distillation in washing slag water cistern 1 by pipeline to two-stage flash device 13, connect
Regulating valve 15 is set on adapter road.Vavuum pump is monitored and fed back to pressure in two-stage flash device 13 by pressure sensor 16
12, the pressure in two-stage flash device 13 is adjusted and maintained by vavuum pump 12 in 20.0kPa or so.Washing slag water enters two-stage flash
Rapid flash distillation, flash-off steam mean temperature～60 DEG C after device 13.Flash-off steam is moved upwards, is removed in steam by demister 4
Impurity and mechanical water after with spray equipment 6 spray hot water (～50 DEG C) carry out contact heat-exchanging.Hot water (～58 after being heated
DEG C) and flash-off steam condensate liquid together flow in hot water cistern 5.Hot water in hot water cistern 5 passes through again heat-exchanger pump 10
To deliver to continue in primary flash device and exchange heat.Can be by the flushing cinder water temperature in two-stage flash device washing slag water cistern by washing slag water flash distillation
Degree is down to less than 60 DEG C, fully meets blast furnace slag flushing and liquidates the requirement of slag water temperature.There is no flash distillation in washing slag water cistern 1
Washing slag water is delivered to blast furnace slag flushing system circulation and is utilized by washing slag water back water pump 14.
Finally illustrate, preferred embodiment above is only unrestricted to illustrate technical scheme, although logical
Cross above preferred embodiment to be described in detail the present invention, it is to be understood by those skilled in the art that can be
In form and in details various changes are made to it, without departing from claims of the present invention limited range.
Claims (2)
1. a kind of waste heat recovery system of blast furnace slag quenching water, it is characterised in that：Including pulp water elevator pump, flash vessel, vavuum pump, hot water
Pump and washing slag water back water pump；
The pulp water elevator pump is connected with the flash vessel, and described washing slag water back water pump one end is connected with flash vessel, the other end with
Blast furnace slag flushing water system connects；
The flash vessel is closed structure, including washing slag water cistern, demister, hot water cistern, spray equipment and demisting
Device；Flash vessel point two stage arrangement, pressure is higher than pressure in two-stage flash device in primary flash device；The washing slag water elevator pump and institute
State primary flash device to be connected, primary flash device is connected with two-stage flash device by pipeline, and control valve is arranged on pipeline；Washing slag water
Primary flash device and two-stage flash device are sequentially passed through, heating hot water sequentially passes through two-stage flash device and primary flash device.
2. a kind of waste heat recovery system of blast furnace slag quenching water according to claim 1, it is characterised in that：The flash vessel internal pressure
Power is detected by pressure sensor, and maintains pressure in the flash vessel constant by the vavuum pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510481607.0A CN104988257B (en) | 2015-08-03 | 2015-08-03 | Blast furnace slag washing water waste heat recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510481607.0A CN104988257B (en) | 2015-08-03 | 2015-08-03 | Blast furnace slag washing water waste heat recovery system |
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| Publication Number | Publication Date |
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| CN104988257A CN104988257A (en) | 2015-10-21 |
| CN104988257B true CN104988257B (en) | 2017-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510481607.0A Active CN104988257B (en) | 2015-08-03 | 2015-08-03 | Blast furnace slag washing water waste heat recovery system |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108775570B (en) * | 2018-06-22 | 2024-04-30 | 上海帝广机电工程技术有限公司 | Slag waste water waste heat recovery energy-saving device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102557318A (en) * | 2012-01-13 | 2012-07-11 | 安徽工业大学 | Method and system for preparing soft water and utilizing afterheat by using spent steam obtained through ironmaking blast furnace slag washing |
| CN202852775U (en) * | 2012-09-16 | 2013-04-03 | 北京工业大学 | Flash evaporator based on waste heat source energy recovery |
| CN203904370U (en) * | 2014-06-27 | 2014-10-29 | 福建立信换热设备制造股份公司 | Device applied to heat recovery of slag flushing water |
| CN104567442B (en) * | 2014-12-31 | 2017-01-18 | 北京京诚科林环保科技有限公司 | Blast furnace slag flushing water waste heat refrigerating system |
| CN204752769U (en) * | 2015-08-03 | 2015-11-11 | 中冶赛迪工程技术股份有限公司 | Blast furnace slag water waste heat recovery system |
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