CN111928709A - Slag flushing exhaust steam waste heat recovery system and recovery method - Google Patents
Slag flushing exhaust steam waste heat recovery system and recovery method Download PDFInfo
- Publication number
- CN111928709A CN111928709A CN202010664278.4A CN202010664278A CN111928709A CN 111928709 A CN111928709 A CN 111928709A CN 202010664278 A CN202010664278 A CN 202010664278A CN 111928709 A CN111928709 A CN 111928709A
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- Prior art keywords
- heat exchange
- steam
- heat
- slag
- exhaust
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0014—Recuperative heat exchangers the heat being recuperated from waste air or from vapors
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
Abstract
A slag flushing exhaust steam waste heat recovery system and a recovery method thereof are provided, wherein the slag flushing exhaust steam waste heat recovery system comprises a slag discharging device, a slag flushing device, a steam collecting device and a heat exchange device; the slag flushing device is arranged below the steam collecting device; the steam collecting device comprises a heat exchange pipe section and an exhaust pipe section; the exhaust pipe section is communicated with the outside; the heat exchange device comprises a steam inlet, a heat exchanger, a gas outlet and a fan which are connected in sequence; the heat exchange pipe section is communicated with the steam inlet; the exhaust pipe section is communicated with an air outlet of the fan; a recovery process comprising: a washing step; a heat exchange step: closing the first valve and opening the fan, and allowing the exhaust steam to enter the heat exchange device from the heat exchange tube section through the steam inlet through the negative pressure of the fan for heat exchange; and (3) exhausting: the steam-gas mixture which completes heat exchange and is output from the heat exchange device is conveyed to the exhaust pipe section from the air outlet through the fan and is discharged to the outside; the recovery system carries out the collection of maximize through the heat to the exhaust steam, carries the heat through heat transfer device, realizes the continuous recycle of the waste heat of towards sediment exhaust steam.
Description
Technical Field
The invention relates to the field of energy recovery equipment, in particular to a system and a method for recovering waste heat of waste steam generated by slag flushing.
Background
In the iron-making process of a blast furnace in the steel industry, the blast furnace generates a large amount of high-temperature slag (about 1400 ℃ C. and 1500 ℃ C.), and the slag is impacted and broken by slag flushing water to be cooled. The blast furnace slag flushing exhaust steam is high-temperature steam (the temperature is about 90 ℃) which is generated instantaneously when slag flushing water impacts high-temperature slag. The slag flushing exhaust steam is generally directly discharged through a discharge pipe, the contained heat energy is not recycled, energy and water resources are wasted, and the discharge of water vapor causes certain corrosion to surrounding buildings.
Disclosure of Invention
Aiming at the defects in the prior art, the first purpose of the invention is to provide a slag flushing exhaust steam waste heat recovery system, which can realize continuous recovery and utilization of slag flushing exhaust steam waste heat by maximally collecting the heat of exhaust steam and conveying the heat by a heat exchange device.
The second purpose of the invention is to provide a method for recovering the waste heat of the waste steam generated by slag flushing, which is combined with a recovery system to realize continuous recovery and utilization of the waste heat of the waste steam.
The first purpose of the above technology of the present invention is realized by the following technical solutions: a slag flushing dead steam waste heat recovery system comprises a slag discharging device, a slag flushing device, a steam collecting device and a heat exchange device;
the slag flushing device is arranged below the steam collecting device; the steam collecting device comprises a heat exchange pipe section and an exhaust pipe section, and a first valve is arranged between the heat exchange pipe section and the exhaust pipe section; the exhaust pipe section is communicated with the outside;
the heat exchange device comprises a steam inlet, a heat exchanger, a gas outlet and a fan which are connected in sequence; the heat exchange pipe section is communicated with the steam inlet; the exhaust pipe section is communicated with the air outlet of the fan.
In one embodiment, the tapping device is a blast furnace.
In one embodiment, the slag flushing device comprises a flushing pipe, a water pump and a slag flushing pool; the water pump is connected with the flushing pipe; the slag flushing pool is arranged below the steam collecting device.
In one embodiment, the heat exchange tube section is below the exhaust tube section.
In one embodiment, the heat exchange device further comprises a second valve; a second valve is disposed between the heat exchange tube section and the steam inlet.
In one embodiment, the slag flushing exhaust steam waste heat recovery system further comprises a liquid collecting device; the heat exchanger is communicated with the slag flushing device through a liquid collecting device.
In one embodiment, the heat exchanger comprises a heat exchange cavity, a baffle plate, a heat transfer pipe and a heat collector; the baffle is arranged at the steam outlet end of the heat exchange cavity; the included angle between the plane of the baffle plate and the heat outlet direction of the heat exchange cavity is not equal to 0; the heat transfer pipe penetrates through the heat exchange cavity, and the outlet of the heat transfer pipe is connected with the inlet of the heat collector; the outlet of the heat collector is connected with the inlet of the heat transfer pipe.
In one embodiment, the number of the heat exchange cavities is at least three, and a steam outlet end of each heat exchange cavity is provided with a baffle.
In one embodiment, the baffle is a corrugated baffle.
The second objective of the above technology of the present invention is achieved by the following technical solutions: a method for recovering waste heat of slag flushing dead steam comprises the following steps: a washing step: flushing the metal slag output by the slag tapping device through a slag flushing device and generating exhaust steam;
a heat exchange step: closing the first valve and opening the fan, and allowing the exhaust steam to enter the heat exchange device from the heat exchange tube section through the steam inlet through the negative pressure of the fan for heat exchange;
and (3) exhausting: the steam-gas mixture which completes heat exchange and is output from the heat exchange device is conveyed to the exhaust pipe section from the air outlet through the fan and is discharged to the outside.
In one embodiment, the condensed water generated in the heat exchange device is collected by the liquid collecting device and is conveyed to the slag flushing device.
In conclusion, the invention has the following beneficial effects:
1. the recovery system disclosed by the invention can be used for maximally collecting the heat of the exhaust steam generated in the slag flushing process and conveying the heat through the heat exchange device, so that the continuous recycling of the waste heat of the slag flushing exhaust steam is realized, the heat can be converted and used for heating, bathrooms and the like, and the energy is saved;
2. the first valve of the recovery system can control and collect the exhausted steam exhausted from the steam collecting device, the first valve is closed, and the recovery system operates normally; the first valve is opened, and the exhaust steam is directly discharged; the use flexibility is high;
3. the heat exchange device of the recovery system can collect and utilize the heat of the dead steam, and the fan generates negative pressure to extract the dead steam, so that the dead steam can be subjected to heat collection through the heat exchanger and then is discharged through the exhaust pipe section;
4. the recovery system has a certain whitening effect, most of the exhaust steam is condensed, the exhaust steam emission state is greatly improved from the original white smoke rolling phenomenon, and the recovery system has a good environment-friendly effect.
Drawings
FIG. 1 is a schematic structural view of example 1;
wherein, 1, a slag discharging device; 2. a slag flushing device; 21. a flush pipe; 22. a water pump; 23. a slag flushing pool; 3. a steam collecting device; 31. a heat exchange tube section; 32. an exhaust pipe section; 33. a first valve; 4. a heat exchange device; 41. a steam inlet; 42. a heat exchanger; 421. a heat exchange cavity; 4211. a steam outlet end; 422. a baffle plate; 423. a heat transfer tube; 4231. an outlet of the heat transfer tube; 4232. an inlet of the heat transfer tube; 424. a heat collector; 4241. a collector inlet; 4242. an outlet of the heat collector; 43. an air outlet; 44. a fan; 441. an air outlet; 45. a second valve; 5. and a liquid collecting device.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
It should be noted that all the directional terms such as "upper" and "lower" referred to herein are used with respect to the view of the drawings, and are only for convenience of description, and should not be construed as limiting the technical solution.
Example 1:
referring to fig. 1, the slag flushing exhaust steam waste heat recovery system comprises a slag discharging device 1, a slag flushing device 2, a steam collecting device 3, a heat exchange device 4 and a liquid collecting device 5;
the slag flushing device 2 comprises a flushing pipe 21, a water pump 22 and a slag flushing pool 23; the water pump 22 is connected with the flushing pipe 21; the slag flushing pool 23 is arranged below the steam collecting device 3;
the steam collecting device 3 includes a heat exchange pipe section 31 and an exhaust pipe section 32; the heat exchange pipe section 31 is below the exhaust pipe section 32; a first valve 33 is arranged between the heat exchange pipe section 31 and the exhaust pipe section 32; the exhaust pipe section 32 communicates with the outside;
the heat exchange device 4 comprises a steam inlet 41, a heat exchanger 42, a gas outlet 43 and a fan 44 which are connected in sequence; the heat exchange device 4 further comprises a second valve 45; the second valve 45 is arranged between the heat exchange tube section 31 and the steam inlet 41, and when the second valve 45 is opened, the heat exchange tube section 31 is communicated with the steam inlet 41; the exhaust pipe section 32 is communicated with an air outlet 441 of the fan 44; the heat exchanger 42 comprises a heat exchange cavity 421, a baffle 422, a heat transfer pipe 423 and a heat collector 424; the baffle 422 is arranged at the steam outlet end 4211 of the heat exchange cavity 421; at least three heat exchange cavities 421 are provided, and a steam outlet end 4211 of each heat exchange cavity 421 is provided with a baffle 422; an included angle between the plane of the baffle 422 and the heat outlet direction of the heat exchange cavity 421 is not equal to 0, so that more area of the dead steam contacting the baffle 422 can be ensured, and the condensing effect is better; the heat transfer pipe 423 is arranged in the heat exchange cavity 421 in a penetrating way, and an outlet 4231 of the heat transfer pipe 423 is connected with an inlet 4241 of the heat collector 424; an outlet 4242 of the heat collector 424 is connected with an inlet 4232 of the heat transfer pipe 423;
the heat exchanger 42 is communicated with the slag flushing device 2 through the liquid collecting device 5.
Wherein the slag tapping device 1 is a blast furnace.
The method for recovering the waste heat of the slag flushing exhaust steam by using the system comprises the following steps:
a washing step: the large amount of high temperature slag produced is output from the blast furnace to the slag flushing tank 23, and the water pump 22 pumps water out of the flushing pipe 21 and flushes the high temperature slag, and then exhaust steam is produced.
A heat exchange step: the first valve 33 is closed and the fan 44 is opened, and the exhaust steam enters the heat exchange device 4 from the heat exchange pipe section 31 through the steam inlet 41 through the negative pressure of the fan 44 for heat exchange;
and (3) exhausting: the exhaust steam sequentially passes through the plurality of heat exchange cavities 421 (the arrow direction in the heat exchange device in fig. 1 is a passage of the exhaust steam), condensed water is generated when passing through the baffle 422, the condensed water flows into the liquid collecting device 5, the baffle 422 can adopt a wave-shaped structure similar to a demister, and can also adopt vertical or horizontal installation to block and guide the condensed water which is continuously separated out; water is introduced into the heat transfer pipe 423, in the heat exchange cavity 421, heat is transferred from the dead steam to the water in the heat transfer pipe 423 through the heat exchange cavity 421, hot water is delivered to the heat collector 424 through the heat transfer pipe 423 to be used by a user or supply heat, cold water in the heat transfer pipe 423 is output from the outlet 4242 of the heat collector 424 and passes through the heat exchange cavity 421 again, and heat is transferred to the heat collector 424 in a circulating manner (the direction of an arrow in the heat transfer pipe in fig. 1 is the direction of water flow in the heat transfer pipe); if a plurality of heat exchange cavities 421 are provided, the pipeline of the heat transfer pipe 423 penetrates through the plurality of heat exchange cavities 421 for circulation; after the exhaust steam passes through the heat exchanger 42, the temperature is greatly reduced, and the output steam is a steam-gas mixture which is conveyed to the exhaust pipe section 32 from the air outlet 43 through the fan 44 and is discharged to the outside;
the recovery system cools high-temperature slag by using condensed water to generate exhaust steam, in the heat exchange cavity 421, cold water in the heat transfer pipe 423 absorbs heat and then becomes hot water, after the hot water is output to a user of the heat collector 424 for use, the temperature is reduced to become cold water, the cold water is conveyed back to the heat exchange cavity 421 to continuously exchange heat with the exhaust steam, and the continuous circulation of the heat transfer pipe 423 is used for realizing the waste heat recovery of the exhaust steam; the heat collector 424 can be used in hot water type lithium bromide unit refrigeration, winter heating, bathhouse bathroom, etc.
A liquid collection step: the condensed water generated in the heat exchanger 42 flows to the liquid collecting device 5 (the direction of the arrow in the liquid collecting device is the direction of the condensed water flow in fig. 1) under the diversion of the baffle 422, is collected and conveyed to the slag flushing device 2, is pumped to the flushing pipe 21 by the water pump 22 in the slag flushing device 2, and is discharged as the water flow for flushing slag, so that the full utilization of resources is realized.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. A slag flushing dead steam waste heat recovery system comprises a slag discharging device, a slag flushing device, a steam collecting device and a heat exchange device;
the method is characterized in that: the slag flushing device is arranged below the steam collecting device; the steam collecting device comprises a heat exchange pipe section and an exhaust pipe section, and a first valve is arranged between the heat exchange pipe section and the exhaust pipe section; the exhaust pipe section is communicated with the outside;
the heat exchange device comprises a steam inlet, a heat exchanger, a gas outlet and a fan which are connected in sequence; the heat exchange pipe section is communicated with the steam inlet; the exhaust pipe section is communicated with an air outlet of the fan.
2. The flushing slag dead steam waste heat recovery system of claim 1, wherein the flushing slag device comprises a flushing pipe, a water pump and a flushing slag pool; the water pump is connected with the flushing pipe; the slag flushing pool is arranged below the steam collecting device.
3. The sluicing exhaust steam waste heat recovery system of claim 1 wherein said heat exchange tube section is below the exhaust tube section.
4. The sluicing exhaust steam waste heat recovery system of claim 1, wherein the heat exchange device further comprises a second valve; the second valve is disposed between the heat exchange tube section and the steam inlet.
5. The sluicing exhaust steam waste heat recovery system of claim 1, wherein the sluicing exhaust steam waste heat recovery system further comprises a liquid collection device; the heat exchanger is communicated with the slag flushing device through a liquid collecting device.
6. The sluicing exhaust steam waste heat recovery system of claim 1, wherein the heat exchanger comprises a heat exchange cavity, baffles, heat transfer tubes and a heat collector; the baffle is arranged at the steam outlet end of the heat exchange cavity; an included angle between the plane of the baffle plate and the heat outlet direction of the heat exchange cavity is not equal to 0; the heat transfer pipe penetrates through the heat exchange cavity, and an outlet of the heat transfer pipe is connected with an inlet of the heat collector; the outlet of the heat collector is connected with the inlet of the heat transfer pipe.
7. The sluicing exhaust steam waste heat recovery system of claim 6, wherein the number of the heat exchange cavities is at least three, and a steam outlet end of each heat exchange cavity is provided with a baffle.
8. The sluicing exhaust steam waste heat recovery system of claim 7, wherein the baffle is a wave-shaped baffle.
9. A method for recovering waste heat of slag flushing dead steam is characterized by comprising the following steps:
a washing step: flushing the metal slag output by the slag tapping device through a slag flushing device and generating exhaust steam;
a heat exchange step: closing the first valve and opening the fan, and allowing the exhaust steam to enter the heat exchange device from the heat exchange tube section through the steam inlet through the negative pressure of the fan for heat exchange;
and (3) exhausting: the steam-gas mixture which completes heat exchange and is output from the heat exchange device is conveyed to the exhaust pipe section from the air outlet through the fan and is discharged to the outside.
10. The method for recovering the waste heat of the slag flushing dead steam as claimed in claim 9, wherein the condensed water generated in the heat exchange device is collected by a liquid collecting device and is conveyed to the slag flushing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010664278.4A CN111928709A (en) | 2020-07-10 | 2020-07-10 | Slag flushing exhaust steam waste heat recovery system and recovery method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010664278.4A CN111928709A (en) | 2020-07-10 | 2020-07-10 | Slag flushing exhaust steam waste heat recovery system and recovery method |
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| CN111928709A true CN111928709A (en) | 2020-11-13 |
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| CN202010664278.4A Pending CN111928709A (en) | 2020-07-10 | 2020-07-10 | Slag flushing exhaust steam waste heat recovery system and recovery method |
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Citations (7)
| 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 |
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| CN103981306A (en) * | 2014-05-25 | 2014-08-13 | 北京首钢国际工程技术有限公司 | Method and device for recycling waste heat in molten slag water quenching and granulating process of ironmaking blast furnace |
| CN203848705U (en) * | 2014-05-13 | 2014-09-24 | 阿姆斯壮机械（中国）有限公司 | Exhausted steam recycling system |
| JP2015178913A (en) * | 2014-03-18 | 2015-10-08 | 地方独立行政法人青森県産業技術センター | Slag heat recovering device, slag heat recovering method, and heat generating method |
| CN204874563U (en) * | 2015-08-21 | 2015-12-16 | 石家庄国融安能分布能源技术有限公司 | Towards sediment exhaust steam waste heat heating system |
| CN110819747A (en) * | 2019-09-30 | 2020-02-21 | 广东韶钢松山股份有限公司 | Blast furnace slag flushing dead steam eliminating and waste heat recovery system |
-
2020
- 2020-07-10 CN CN202010664278.4A patent/CN111928709A/en active Pending
Patent Citations (7)
| 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 |
| CN102829640A (en) * | 2012-08-31 | 2012-12-19 | 上海宝钢节能技术有限公司 | System and method for heating, supplying power and cooling by using blast furnace slag water, exhaust steam and smoke waste heat |
| JP2015178913A (en) * | 2014-03-18 | 2015-10-08 | 地方独立行政法人青森県産業技術センター | Slag heat recovering device, slag heat recovering method, and heat generating method |
| CN203848705U (en) * | 2014-05-13 | 2014-09-24 | 阿姆斯壮机械（中国）有限公司 | Exhausted steam recycling system |
| CN103981306A (en) * | 2014-05-25 | 2014-08-13 | 北京首钢国际工程技术有限公司 | Method and device for recycling waste heat in molten slag water quenching and granulating process of ironmaking blast furnace |
| CN204874563U (en) * | 2015-08-21 | 2015-12-16 | 石家庄国融安能分布能源技术有限公司 | Towards sediment exhaust steam waste heat heating system |
| CN110819747A (en) * | 2019-09-30 | 2020-02-21 | 广东韶钢松山股份有限公司 | Blast furnace slag flushing dead steam eliminating and waste heat recovery system |
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Application publication date: 20201113 |