CN115369195B - Waste heat recovery system of blast furnace slag flushing water and working method thereof - Google Patents
Waste heat recovery system of blast furnace slag flushing water and working method thereof Download PDFInfo
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- CN115369195B CN115369195B CN202211016377.7A CN202211016377A CN115369195B CN 115369195 B CN115369195 B CN 115369195B CN 202211016377 A CN202211016377 A CN 202211016377A CN 115369195 B CN115369195 B CN 115369195B
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- 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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
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- 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
The application relates to a blast furnace slag flushing water waste heat recovery system and a working method thereof, and the method solves the problem that the blast furnace slag flushing water waste heat is difficult to recycle in summer; the high-efficiency circulation of slag flushing water is driven by a mode of large flow and small temperature difference, a vertical parallel negative pressure flash evaporation technology is adopted to prepare sufficient flash evaporation negative pressure steam in the circulation process of the slag flushing water, the exhaust steam is used for driving an exhaust steam bromine cooler to prepare sufficient chilled water, and under the condition of insufficient exhaust steam, the steam bromine coolers arranged in series are automatically started from a dormant state, so that the chilled water reaches the standard, and the high-efficiency recycling of the waste heat of the slag flushing water of the blast furnace in summer is realized. Not only solves the cooling problem of slag flushing water in summer and reduces the electric energy consumption of the operation of a cooling tower, but also achieves the aims of dehumidifying and blowing the blast furnace and reducing the fuel ratio, thereby truly achieving the purposes of saving energy and reducing consumption and actually reducing the production cost in place.
Description
Technical Field
The application belongs to the field of comprehensive utilization of waste heat in the steel industry, and mainly relates to a blast furnace slag flushing water waste heat recovery system and a working method thereof.
Background
With the improvement of the national importance of the energy-saving field, the policies and the system related to the carbon neutralization and the carbon peak are gradually landed, and the energy-saving and consumption-reducing working pressure of iron and steel enterprises is multiplied; in the face of the pressure of energy consumption indexes, iron and steel enterprises pay more attention to the efficient recycling of various low-quality heat sources.
The waste heat of the blast furnace slag flushing water is a free energy source, the heat source is rich, and the energy saving and emission reduction benefits for the production process are obvious; at present, almost all iron and steel enterprises finish the technical transformation of the waste heat recovery of slag flushing water for heating in winter, and the waste heat recovery of slag flushing water of a blast furnace can be realized in summer from the viewpoint of improving the comprehensive utilization rate of free energy, so that the economic benefit is higher; after the slag flushing water is heated and cooled, the operation of a slag flushing water cooling system can be omitted, and the activity of water slag flushing is improved.
This background information section is only for enhancement of understanding of the general background of the application and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
In order to solve the problems, the application provides a blast furnace slag flushing water waste heat recovery system and a working method thereof, relates to the use of the blast furnace slag flushing water waste heat for carrying out dehumidification and air blowing in summer, not only realizes the summer recycling of the blast furnace slag flushing water waste heat, but also finds an application mode with the most obvious economic benefit for the blast furnace slag flushing water waste heat, and provides a new way for enterprises to save energy, reduce consumption and reduce production cost.
In order to achieve the technical purpose, the application adopts the following technical scheme:
the application provides a blast furnace slag flushing water waste heat recovery system, which comprises a flash evaporation heat extraction system A, a vacuum environment generation system B, a bromine cold machine serial refrigeration system C, a chilled water circulation system D, a cooling water circulation system E and a dehumidification system F; the bromine cooler serial refrigeration system C is connected with the flash evaporation heat taking system A, the chilled water circulation system D and the cooling water circulation system E; the vacuum environment generating system B is connected with the flash evaporation heat taking system A, and the dehumidifying system F is connected with the chilled water circulating system D.
In some embodiments of the application, the flash evaporation heat-taking system A comprises a slag flushing water tank, a water supply slag slurry pump, a heat-taking water supply pipeline, a water collector, a flash evaporation tank, a water separator, a water return slag slurry pump and a heat-taking water return pipeline which are sequentially connected, so that a heat-taking closed loop flow of blast furnace slag flushing water is formed, and the slag flushing water is returned to the original slag tank after flash evaporation heat-taking and cooling.
In some embodiments of the present application, the vacuum environment generating system B includes an exhaust pipe, a vacuum pump, a condensate tank, and a condensate pump connected in sequence.
In some embodiments of the application, the bromine-cooler serial refrigeration system C comprises a dead-steam bromine cooler and a steam-type bromine cooler, wherein the dead-steam bromine cooler is connected with the steam-type bromine cooler through a chilled water transfer pipe.
In some embodiments of the application, the chilled water circulation system D comprises a chilled water supply pipe, a chilled water circulation pump, and a chilled water return line.
In some embodiments of the present application, the cooling water circulation system E includes a first cooling water pipeline, a first cooling water circulation pump, a first cooling tower, a second cooling water circulation pump, a second cooling water pipeline, a condensed water recovery pipeline, a second condensed water pump, and a condensed water pool.
In some embodiments of the present application, the dehumidifying system F comprises a blast furnace blower, a blast furnace air supply line, a surface cooler, and an air filter, wherein the surface cooler is connected with the air filter; the air enters the front of the blast furnace, is cooled by the surface cooler after being filtered by the air, and enters the blast furnace through the blast furnace fan and the blast furnace air supply pipeline.
In some embodiments of the application, the chilled water produced by the exhaust steam bromine cooler is frozen and cooled again by the steam bromine cooler, then is pumped to the surface cooler by a chilled water circulating pump, exchanges heat with air, and returns to the exhaust steam bromine cooler to complete the freezing and dehumidifying process.
In some embodiments of the application, the exhaust pipe is connected with the generator cavity of the exhaust steam bromine cooler, and a vacuum environment is created for flash evaporation heat exchange together with a vacuum pump, a condensate water tank and a condensate water pump.
In some embodiments of the application, the steam type bromine cooler is connected with a steam pipe network through a steam valve.
In some embodiments of the present application, the cooling water circulation system E has two cooling water circulation pipelines, one of the cooling water circulation pipelines is heated after heat exchange by the exhaust steam bromine cooler, flows through the cooling water pipeline, returns to the cooling tower through the cooling water circulation pump, releases heat and cools down through the cooling tower, and returns to the water tank for recycling.
The other path of cooling water exchanges heat in the steam type bromine cooler, flows in the second cooling water pipeline, returns to the second cooling tower through the second cooling water circulating pump,
in some embodiments of the application, the water vapor in the air is condensed by the surface cooler, drips into the condensation water tank, and is conveyed to the second cooling tower by the second condensation water pump for recycling.
In some embodiments of the application, the serial refrigeration system of the bromine cooler is driven by double energy sources, namely, the bromine cooler is driven by 80 ℃ saturated exhaust steam which is firstly subjected to heat exchange by the blast furnace slag flushing water, and is driven by the steam type bromine cooler when no hot water is insufficient or absent.
In some embodiments of the present application, the flash tanks are multiple, preferably 3 flash tanks, to form a vertical parallel flash tank group, and the flash tanks are connected in parallel to take heat, and the negative pressure steam is used for directly driving the lithium bromide refrigerator.
In some embodiments of the application, in the flash evaporation heat-taking system A, the water supply pipeline and the water return pipeline are both provided with two slurry pumps, one of which is controlled by frequency conversion, so that the liquid level in the flash evaporation tank is ensured to be stable.
In some embodiments of the application, a slag flushing water strong turbulence disturbance circulation device is arranged in the water collector to prevent the slag flushing water from precipitating, scaling and blocking, and keep the circulation water pipeline of the slag flushing water unblocked.
In some embodiments of the application, the flash tank is provided with a liquid level meter on-line monitoring device, the tank group is designed to be communicated with water and gas, the liquid level and the negative pressure of each flash tank are kept the same, and the system operation is more stable.
In some embodiments of the application, the slurry pump is a variable frequency and power frequency linkage control type exhaust steam bromine cooler, a steam bromine cooler and a surface cooler which are operated in series; the flash tank group is directly connected with the water separator, the water collector, the exhaust pipe and the exhaust steam bromine cooler respectively; and the exhaust steam bromine cooler and the steam bromine cooler in the bromine cooler serial refrigeration system are connected through a chilled water switching pipeline, and chilled water passes through the two bromine coolers in sequence.
In some embodiments of the application, two bromine coolers are arranged in series, the first bromine cooler is driven by flash evaporation exhaust steam of slag flushing water, the second bromine cooler is driven by industrial steam, the steam consumption of the steam type bromine cooler is automatically adjusted according to the chilled water outlet temperature of the exhaust steam bromine cooler, the outlet chilled water temperature is ensured to be within a permissible range, and the refrigeration requirement of the surface cooler is met.
In some embodiments of the application, the water supply and return pipelines in the flash evaporation heat taking system A are driven by two slurry pumps, at least one variable frequency control can ensure the stable control of the water level of the flash evaporation tank, and the residence time and flash evaporation rate of the slag flushing water are ensured.
In some embodiments of the application, the flash tank liquid level detection adopts a structure that a U-shaped pipe is externally connected with a liquid level sensor, so that the liquid level detection interference caused by boiling of slag flushing water is prevented, and the guarantee is provided for controlling the flash tank liquid level to be stable through frequency conversion of a water pump; the tank group is subjected to water and gas communication control design, the liquid level and the negative pressure of each flash tank are coordinated to be the same, and the system is more stable to operate; meanwhile, each flash tank can be independently operated and started and stopped, the flash pressure of slag flushing water is low, the flash steam temperature is high, the system operation is low in energy consumption, and the flash steam is high in quality.
In some embodiments of the application, a liquid level switch is arranged at the top of the flash tank, and an electric regulating valve is arranged at the steam outlet pipe section of the flash tank; under the failure working condition of the liquid level sensor, the electric regulating valve can control the switch of the steam outlet of the flash tank according to the start and stop of the liquid level switch, so that slag flushing water is prevented from entering the exhaust steam bromine cooler.
The application also relates to a working method of the blast furnace slag flushing water waste heat recovery system, during normal slag discharging, the high-temperature slag flushing water in the slag flushing water tank 1 is pumped by the water supply slag slurry pump 2 and is conveyed to the water separator 6 through the heat-collecting water supply pipeline 3, the slag flushing water is uniformly distributed into the flash tank group 5 for rapid evaporation, the formed high-temperature exhaust steam is directly supplied to the exhaust steam bromine cooling machine 33, the temperature of the slag flushing water after flash evaporation is reduced and falls into the water collector, and then the slag flushing water is returned to the slag flushing water tank through the heat-collecting water return pipeline by the water return slag slurry pump; the exhaust steam bromine cooler 33 receives the energy of flash evaporation exhaust steam, then prepares chilled water, and the chilled water is conveyed to the surface cooler 27 by the chilled water circulating pump 21 after passing through the chilled water transfer pipeline 30 and the steam bromine cooler 19, the furnace air is filtered by the air filter 28 connected with the surface cooler 27, and then is cooled by the chilled water circulating pump 21 to the chilled water in the surface cooler 27, and the water vapor in the air is condensed and dropped in a condensation water pool, and is conveyed to a second cooling tower by the second condensation water pump 23 for recycling according to the set time; the chilled water after heat exchange returns to the exhaust steam bromine cooler again through the chilled water return pipeline 29.
In some embodiments of the application, part of chilled water is led from the bromine chiller serial refrigeration system C to the energy management and control center office building; a fan coil device is adopted to try water-cooling type comfort air conditioner for partial office areas.
The application finds a high-efficiency comprehensive utilization mode for low-quality heat sources in iron and steel enterprises; the intermittent operation characteristics of tapping and deslagging of the blast furnace, the characteristics of low temperature of slag flushing water and the like make the efficient recycling of the waste heat of the slag flushing water very difficult.
The system and the working method thereof for utilizing the waste heat of the blast furnace slag flushing water, provided by the application, have the following advantages at least in the mode of connecting the exhaust steam bromine cooler and the steam bromine cooler in series:
1) The problem that flash evaporation efficiency is reduced due to sudden temperature drop of slag flushing water during the intermittent tapping interval of tapping can be solved, and continuous production of up-to-standard chilled water is affected; the two processes for preparing the chilled water are linked, the capability of the exhaust steam bromine cooler is exerted to the maximum extent, and the steam bromine cooler is used as an auxiliary and supplementary device, so that the waste heat of slag flushing water can be recovered to the maximum extent.
2) The flash tanks are synchronously connected in parallel in a flash mode, so that a sufficient amount of exhaust steam can be generated and used for driving an exhaust steam bromine cooler to prepare qualified chilled water; when the total amount of the intermittent steam for slag tapping is insufficient, the steam bromine cooler is automatically started, so that the problem of insufficient refrigerating capacity in a short time is solved.
3) The high-flow high-temperature slag flushing water circulation mode provides a flash evaporation heat exchange mode of high-flow low-temperature slag flushing water for a flash evaporation system, and can obtain the exhaust steam temperature as high as possible, so that the exhaust steam bromine cooler can operate efficiently.
4) The vertical arrangement of the flash tank and the forced rotational flow technology of the water collector solve the problems of corrosion, deposition, scaling and pipeline blockage of the heat exchange process of the transmission slag flushing water, and influence on the stable operation of the system.
5) According to the application, the flash tanks are interconnected and intercommunicated, the negative pressure balance control module ensures stable control of the liquid level in the flash tanks, and the reasonable water level is a precondition for keeping the flash tanks to operate efficiently.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.
Fig. 1 is a schematic diagram of a system structure of embodiment 1;
FIG. 2 is a schematic view of another embodiment of the present application in a vertical parallel arrangement;
wherein, 1, a slag flushing water tank, 2, a water supply slag slurry pump, 3, a heat-collecting water supply pipeline, 4, a water collector, 5, a flash tank, 6, a water separator, 7, a water return slag slurry pump, 8, a heat-collecting return water pipeline, 9, an exhaust pipe, 10, a vacuum pump, 11, a condensate water tank, 12, a first condensate water pump, 13, a first cooling water pipeline, 14, a first cooling water circulating pump, 15, a first cooling tower, 16, a second cooling tower, 17, a second cooling water circulating pump, 18, a second cooling water pipeline, 19, a steam type bromine cooler, 20, a chilled water supply pipe, 21, a chilled water circulating pump, 22, a condensed water recovery pipeline, 23, a second condensate water pump, 24, a condensate water tank, 25, a blast furnace fan, 26, a blast furnace air supply pipeline, 27, a surface cooler, 28, an air filter, 29, a chilled water return pipeline, 30, a chilled water switching pipeline, 31, a steam valve, 32, a steam pipe network, 33 and a exhaust steam bromine cooler.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
For convenience of description, the words "upper", "lower", "left" and "right" in the present application, if they mean only that the directions are consistent with the upper, lower, left, and right directions of the drawings per se, and do not limit the structure, only for convenience of description and simplification of the description, but do not indicate or imply that the apparatus or element to be referred to needs to have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.
Term interpretation section: the terms "mounted," "connected," "secured," and the like in the present application are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the terms are used herein as specific meanings as understood by those of ordinary skill in the art, and are not limited to the following terms.
The application provides a blast furnace slag flushing water waste heat recovery system, which comprises a flash evaporation heat extraction system A, a vacuum environment generation system B, a bromine cold machine serial refrigeration system C, a chilled water circulation system D, a cooling water circulation system E and a dehumidification system F; the bromine cooler serial refrigeration system C is connected with the flash evaporation heat taking system A, the chilled water circulation system D and the cooling water circulation system E; the vacuum environment generating system B is connected with the flash evaporation heat taking system A, and the dehumidifying system F is connected with the chilled water circulating system D.
In some embodiments of the present application, the flash evaporation heat-taking system a includes a slag flushing water tank 1, a water supply slag slurry pump 2, a heat-taking water supply pipeline 3, a water collector 4, a flash evaporation tank 5, a water separator 6, a backwater slag slurry pump 7 and a heat-taking backwater water return pipeline 8 which are sequentially connected, so as to form a heat-taking closed loop flow of blast furnace slag flushing water, wherein the slag flushing water returns to the raw slag tank after flash evaporation heat-taking and cooling.
In some embodiments of the present application, the vacuum environment generating system B includes an exhaust pipe 9, a vacuum pump 10, a condensate tank 11, and a condensate pump 12, which are sequentially connected.
In some embodiments of the application, the bromine-cooler serial refrigeration system C comprises a dead-steam bromine cooler 33 and a steam-type bromine cooler 19, wherein the dead-steam bromine cooler 33 is connected with the steam-type bromine cooler through a chilled water transfer pipe 30.
In some embodiments of the present application, the chilled water circulation system D includes a chilled water supply pipe 20, a chilled water circulation pump 21, and a chilled water return line 29.
In some embodiments of the present application, the cooling water circulation system E includes a first cooling water pipeline 13, a first cooling water circulation pump 14, a first cooling tower 15, a second cooling tower 16, a second cooling water circulation pump 17, a second cooling water pipeline 18, a condensed water recovery pipeline 22, a second condensed water pump 23, and a condensed water tank 24.
In some embodiments of the present application, the dehumidifying system F comprises a blast furnace blower 25, a blast furnace air supply line 26, a surface cooler 27 and an air filter 28, wherein the surface cooler 27 is connected with the air filter 28; the air enters the front of the blast furnace, is filtered by an air filter 28, is cooled by a surface cooler 27, passes through a blast furnace fan 25 and enters the blast furnace through a blast furnace air supply pipeline 26.
In some embodiments of the application, the chilled water produced by the exhaust steam bromine cooler 33 is cooled again by the steam bromine cooler 19, then sent to the surface cooler 27 by the chilled water circulating pump 21, and after exchanging heat with air, the chilled water returns to the exhaust steam bromine cooler to complete the freezing and dehumidifying process.
In some embodiments of the application, the exhaust pipe 9 is connected with the generator cavity of the exhaust steam bromine cooler 33, and the exhaust steam bromine cooler is connected with the vacuum pump 10, the condensate water tank 11 and the condensate water pump 12 to create a vacuum environment for flash evaporation heat exchange.
In some embodiments of the application, the steam type bromine chiller 19 is connected to a steam pipe network 32 through a steam valve 31.
In some embodiments of the present application, the cooling water circulation system E has two cooling water circulation pipelines, one of the cooling water circulation pipelines is heated after heat exchange by the exhaust steam bromine cooler, flows through the cooling water pipeline 13, returns to the cooling tower 15 through the cooling water circulation pump 14, releases heat and cools down through the cooling tower, and returns to the water tank for recycling.
The other path of cooling water exchanges heat in the steam type bromine cooler, flows through a second cooling water pipeline 18, returns to the second cooling tower 16 through a second cooling water circulating pump 17,
in some embodiments of the present application, the water vapor in the air is condensed by the surface cooler 27, drops into the condensation water tank 24, and is transported to the cooling tower 16 by the condensation water pump 23 for recycling.
In some embodiments of the application, the serial refrigeration system of the bromine cooler is driven by double energy sources, namely, the bromine cooler is driven by 80 ℃ saturated exhaust steam which is firstly subjected to heat exchange by the blast furnace slag flushing water, and is driven by the steam type bromine cooler when no hot water is insufficient or absent.
In some embodiments of the present application, the flash tanks are a plurality of, preferably 3, parallel heating modes, and the lithium bromide refrigerator is directly driven by negative pressure steam.
In some embodiments of the present application, in the flash evaporation heat extraction system a, both the water supply pipeline and the water return pipeline are provided with two slurry pumps, one of which adopts variable frequency control, so as to ensure that the liquid level in the flash tank 5 is kept stable.
In some embodiments of the application, a slag flushing water strong turbulence disturbance circulation device is arranged in the water collector 4 to prevent the slag flushing water from precipitating, scaling and blocking, and keep the circulation water pipeline of the slag flushing water unblocked.
In some embodiments of the application, the flash tank is provided with a liquid level meter on-line monitoring device, the tank group is designed to be communicated with water and gas, the liquid level and the negative pressure of each flash tank are kept the same, and the system operation is more stable.
The application also relates to a working method of the blast furnace slag flushing water waste heat recovery system, during normal slag discharging, the high-temperature slag flushing water in the slag flushing water tank 1 is pumped by the water supply slag slurry pump 2 and is conveyed to the water separator 6 through the heat-collecting water supply pipeline 3, the slag flushing water is uniformly distributed into the flash tank group 5 for rapid evaporation, the formed high-temperature exhaust steam is directly supplied to the exhaust steam bromine cooling machine 33, the temperature of the slag flushing water after flash evaporation is reduced and falls into the water collector, and then the slag flushing water is returned to the slag flushing water tank through the heat-collecting water return pipeline by the water return slag slurry pump; the exhaust steam bromine cooler 33 receives the energy of flash evaporation exhaust steam, then prepares chilled water, and the chilled water is conveyed to the surface cooler 27 by the chilled water circulating pump 21 after passing through the chilled water transfer pipeline 30 and the steam bromine cooler 19, the furnace air is filtered by the air filter 28 connected with the surface cooler 27, and then is cooled by the chilled water circulating pump 21 to the chilled water in the surface cooler 27, and the water vapor in the air is condensed and dropped in a condensation water pool, and is conveyed to a second cooling tower by the second condensation water pump 23 for recycling according to the set time; the chilled water after heat exchange returns to the exhaust steam bromine cooler again through the chilled water return pipeline 29.
In some embodiments of the application, part of chilled water is led from the bromine chiller serial refrigeration system C to the energy management and control center office building; a fan coil device is adopted to try water-cooling type comfort air conditioner for partial office areas.
The application uses the linkage refrigeration of two bromine coolers to solve the intermittent slag tapping problem of the blast furnace, realizes that qualified chilled water can be prepared during the slag tapping intermittent period, synchronously innovatively adopts the large-flow and small-temperature-difference circulation technology of slag flushing water, the vertical parallel negative-pressure flash evaporation technology and the strong turbulence disturbance anti-blocking technology, obtains the highest temperature and the maximum amount of flash exhaust steam, and is used for driving the exhaust steam bromine coolers to prepare sufficient chilled water; the steam bromine cooler utilizes medium-pressure steam in a pipe network as a power source, can be used for efficiently supplementing insufficient cooling capacity of slag-discharging intermittent bromine cooler, and can also provide sufficient chilled water for centralized office areas in factories for comfort central air conditioning.
In some embodiments of the present application, in the flash evaporation heat extraction system a, both the water supply pipeline and the water return pipeline are provided with two slurry pumps, one of which adopts variable frequency control, so as to ensure that the liquid level in the flash tank 5 is kept stable.
In some embodiments of the application, a slag flushing water strong turbulence disturbance circulation device is arranged in the water collector 4 to prevent the slag flushing water from precipitating, scaling and blocking, and keep the circulation water pipeline of the slag flushing water unblocked.
In some embodiments of the application, the flash tank is internally provided with negative pressure, the water flow speed in the water collector is slower, the power is mainly provided by the water return pump for pumping water, the local flow speed of corners is easy to be slow, and deposition and scaling are formed; therefore, the water in the high-pressure water collector is subjected to local circulation disturbance, dead angles are not remained, and local deposition, scaling and clogging are avoided.
In some embodiments of the application, a large flow rate and a small temperature difference are adopted to obtain flash steam with relatively high quality; meanwhile, the thickening of the viscous bottom layer is prevented through strong disturbance, and deposition and scaling are prevented under the condition of larger roughness.
In some embodiments of the application, high volume water is used, for example 2000m 3 /h；
In some embodiments of the application, the flash tank is provided with a liquid level meter on-line monitoring device, the tank group is designed to be communicated with water and gas, the liquid level and the negative pressure of each flash tank are kept the same, and the system operation is more stable.
In some embodiments of the application, when the blast furnace is in normal slag discharge, the temperature of slag flushing water is up to more than 90 ℃, sufficient negative pressure flash steam can be generated in a large-flow small temperature difference mode, and sufficient qualified chilled water can be generated by driving the exhaust steam bromine cooler 33, so that the steam bromine cooler 19 is in a dormant state; after the slag discharge is finished, when the temperature of slag flushing water in the heat-taking water supply pipeline 3 gradually drops, flash evaporation exhaust steam is insufficient, and the temperature of chilled water slowly rises, at the moment, the steam bromine cooler is automatically started, so that the standard supply of chilled water in the chilled water supply pipeline is ensured.
In some embodiments of the application, the flash exhaust steam condensate water and the surface cooler condensate water are all recovered and enter a bromine cooler cooling water circulation system to replace fresh water for supplementation so as to reduce system water consumption.
In some embodiments of the application, the freezing water temperature, the flash evaporation vacuum degree and the slag flushing water temperature are used as core control elements, unmanned intelligent control is realized, and the technical progress of annual recycling of the waste heat of the slag flushing water is realized.
Based on the system and the working method for utilizing the waste heat of the blast furnace slag flushing water, the blast furnace slag flushing water is conveyed to the negative pressure flash tank group through the slag slurry pump, and is quickly evaporated under the assistance of the configuration vacuum pump to obtain 80-85 ℃ dead steam, the dead steam is condensed and liquefied on the surface of the bromine cooler generator, the latent heat of the steam is released to the circulating working medium in the bromine cooler, the energy is acquired by the circulating working medium in the bromine cooler, the circulating water returned by the surface cooler is cooled to obtain up-to-standard chilled water, the cooled water is supplied to the surface cooler again, the temperature of air entering the blast furnace is reduced to be within 10 ℃, and dehumidification and air blast are implemented, so that the purpose of reducing the fuel consumption of the blast furnace is achieved.
Besides the electric energy required by the circulating flow of the solution and the steam, the system has extremely low energy cost because all energy sources come from the slag flushing water of the blast furnace, and simultaneously reduces the temperature of the slag flushing water of the blast furnace, which is a necessary technological process in the production process of the blast furnace, and the implementation of the flash evaporation heat extraction technology can save the energy consumption of the cooling system of the upper tower of the slag flushing water;
the low-pressure flash steam (the steam temperature in summer is about 80 ℃ and the steam temperature in winter is about 70 ℃) of the system can reduce the slag flushing water temperature to about 10 ℃, the peak temperature can be reduced to about 85 ℃ for running, the new water loss can be reduced, the service life of the slag slurry pump is prolonged, the spare part cost is reduced, and the formation of foam slag is avoided.
Simultaneously, the obtained chilled water with the temperature of 10-15 ℃ is conveyed to a dehumidifying and blowing system; in summer, the heat source of slag flushing water at 85-95 ℃ is used for driving the lithium bromide refrigerator to work, the temperature of chilled water return water is 10/15 ℃, and the air humidity after dehumidification is less than 12g/m < 3 >. The temperature of cold air is reduced by 10-15 ℃, but the temperature of the air entering the furnace is increased by 20 ℃. The power consumption of the blast furnace blower is reduced by more than 5 percent, and the fuel ratio is reduced by 3kg/t. The constant humidity between blast furnace blast and winter is realized, and the operation condition of the blast furnace is improved.
Under the same condition, the temperature of the sintering mixture can be increased by 5 ℃, and the yield of the sintering ore can be increased by 0.5%;
finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present application, and the present application is not limited to the above-mentioned embodiments, but may be modified or substituted for some of them by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application. While the foregoing describes the embodiments of the present application, it should be understood that the present application is not limited to the embodiments, and that various modifications and changes can be made by those skilled in the art without any inventive effort.
Claims (6)
1. The blast furnace slag flushing water waste heat recovery system is characterized by comprising a flash evaporation heat extraction system A, a vacuum environment generation system B, a bromine cooler serial refrigeration system C, a chilled water circulation system D, a cooling water circulation system E and a dehumidification system F; the bromine cooler serial refrigeration system C is connected with the flash evaporation heat taking system A, the chilled water circulation system D and the cooling water circulation system E; the vacuum environment generating system B is connected with the flash evaporation heat taking system A, and the dehumidifying system F is connected with the chilled water circulating system D; the bromine cooler serial refrigeration system C comprises a dead steam bromine cooler and a steam bromine cooler which are connected in series; the steam type bromine cooler is connected with a steam pipe network through a steam valve;
the flash evaporation heat-taking system A comprises a slag flushing water tank, a water supply slag slurry pump, a heat-taking water supply pipeline, a water collector, a flash evaporation tank, a water separator, a water return slag slurry pump and a heat-taking water return pipeline which are sequentially connected to form a heat-taking closed loop flow of blast furnace slag flushing water, wherein the slag flushing water returns to the original slag tank after flash evaporation heat-taking and temperature reduction;
the vacuum environment generation system B comprises an exhaust pipe, a vacuum pump, a condensate water tank and a condensate water pump which are sequentially connected, wherein the exhaust pipe is connected with a generator cavity of the exhaust steam bromine cooler, and the exhaust pipe, the condensate water tank and the condensate water pump together create a vacuum environment for flash evaporation heat exchange;
the chilled water circulation system D comprises a chilled water supply pipe, a chilled water circulation pump and a chilled water return pipeline;
the cooling water circulation system E comprises a first cooling water pipeline, a first cooling water circulation pump, a first cooling tower, a second cooling water circulation pump, a second cooling water pipeline, a condensed water recovery pipeline, a second condensed water pump and a condensed water pool;
the dehumidifying system F comprises a blast furnace fan, a blast furnace air supply pipeline, a surface cooler and an air filter, wherein the surface cooler is connected with the air filter; the air enters the front of the blast furnace, is filtered by an air filter, is cooled by a surface cooler, and enters the blast furnace through a blast furnace fan and a blast furnace air supply pipeline; freezing water produced by the exhaust steam bromine cooler is frozen and cooled again by the steam bromine cooler, is pumped to the surface cooler by a freezing water circulating pump through a freezing water supply pipe, exchanges heat with air, and returns to the exhaust steam bromine cooler through a freezing water return pipeline to complete the freezing and dehumidifying process;
the cooling water circulation system E is provided with two paths of cooling water circulation pipelines, one path of cooling water pumped by the circulating water pump from the water tank is heated after heat exchange by the exhaust steam bromine cooler, flows through the first cooling water pipeline, returns to the first cooling tower through the first cooling water circulation pump, releases heat and lowers temperature through the cooling tower, and returns to the water tank for recycling; the other path of cooling water exchanges heat in the steam type bromine cooler, flows in the second cooling water pipeline, returns to the second cooling tower through the second cooling water circulating pump and is recycled; the vapor in the air is condensed by the surface cooler and drops into the condensation water pool, and then is conveyed to the second cooling tower for recycling by the second condensation water pump through the condensation water recycling pipeline.
2. The waste heat recovery system of blast furnace slag-flushing water according to claim 1, wherein the waste heat recovery system is driven by 80 ℃ saturated exhaust steam which is firstly exchanged by the blast furnace slag-flushing water, and is driven by a steam type bromine cooler when no hot water is available.
3. The blast furnace slag-flushing water waste heat recovery system according to claim 1, wherein the number of flash tanks is multiple, the flash tanks are vertically connected in parallel for heating, and a dead steam bromine cooler is directly driven by negative pressure steam.
4. A blast furnace slag-flushing water waste heat recovery system as set forth in claim 3, wherein the number of flash tanks is 3.
5. A blast furnace slag-flushing water waste heat recovery system according to claim 3, wherein in the flash evaporation heat extraction system a, a water supply pipeline and a water return pipeline are both provided with two slag slurry pumps, one of which is controlled by frequency conversion, so as to ensure that the liquid level in the flash evaporation tank is kept stable.
6. A working method of a blast furnace slag-flushing water waste heat recovery system, which is characterized in that the blast furnace slag-flushing water waste heat recovery system according to any one of claims 1 to 5 is adopted, and specifically comprises the following steps: during normal slag discharging, high-temperature slag flushing water in the slag flushing water tank is pumped by a water supply slag slurry pump and is conveyed to the water separator through a heat-taking water supply pipeline, the slag flushing water is uniformly distributed into a flash tank group for rapid evaporation, the formed high-temperature exhaust steam is directly supplied to an exhaust steam bromine cooler, the temperature of the slag flushing water after flash evaporation is reduced and falls into a water collector, and the slag flushing water is returned to the slag flushing water tank through a heat-taking water return pipeline by a water return slag slurry pump; the exhaust steam bromine cooler receives the energy of flash evaporation exhaust steam and then prepares chilled water, the chilled water is conveyed to the surface cooler by a chilled water circulating pump after passing through a chilled water transfer pipeline and a steam bromine cooler, furnace air is filtered by an air filter connected with the surface cooler and then is conveyed to the chilled water cooling in the surface cooler by the chilled water circulating pump, and the water vapor in the air is condensed and dropped in a condensation water pool and is conveyed to a second cooling tower by a second condensation water pump for recycling according to a set time; and the chilled water after heat exchange returns to the exhaust steam bromine cooler again through a chilled water return pipeline.
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| CN103060494A (en) * | 2013-01-09 | 2013-04-24 | 北京世纪源博科技股份有限公司 | Vapor recovery blast furnace slag flushing water system |
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