阅读说明：本技术 一种高炉冲渣水汽余热利用消白系统 (Blast furnace slag flushing water vapor waste heat utilization white-removing system ) 是由 于琪 于 2021-08-17 设计创作，主要内容包括：本发明公开了一种高炉冲渣水汽余热利用消白系统,热处理设备技术领域,包括,乏汽收集装置和乏汽处理装置,所述乏汽收集装置末端设置有乏汽空腔,所述乏汽空腔与所述乏汽处理装置连通,所述乏汽处理装置包括冷凝换热器和电磁脱白装置,所述乏汽空腔与所述冷凝换热器连接,所述冷凝换热器与所述电磁脱白装置连接。提供一种既实现了高炉冲渣水的余热利用,同时解决了供暖管道易堵塞易腐蚀、高炉冲渣水排放导致的污染等问题的高炉冲渣水汽余热利用消白系统。(The invention discloses a blast furnace slag flushing water vapor waste heat utilization and white removal system, which belongs to the technical field of heat treatment equipment and comprises a dead steam collecting device and a dead steam treatment device, wherein a dead steam cavity is arranged at the tail end of the dead steam collecting device and is communicated with the dead steam treatment device, the dead steam treatment device comprises a condensation heat exchanger and an electromagnetic white removal device, the dead steam cavity is connected with the condensation heat exchanger, and the condensation heat exchanger is connected with the electromagnetic white removal device. The blast furnace slag flushing water vapor waste heat utilization white-removing system not only realizes the waste heat utilization of blast furnace slag flushing water, but also solves the problems that a heating pipeline is easy to block and corrode, and pollution caused by the discharge of the blast furnace slag flushing water is caused.)

1. The utility model provides a blast furnace sluicing steam waste heat utilization white system that disappears which characterized in that includes, exhaust steam collection device and exhaust steam processing apparatus, exhaust steam collection device end is provided with the exhaust steam cavity, the exhaust steam cavity with exhaust steam processing apparatus intercommunication, exhaust steam processing apparatus includes condensation heat exchanger and electromagnetism and takes off white device, the exhaust steam cavity with the condensation heat exchanger is connected, the condensation heat exchanger with electromagnetism takes off white device and connects.

2. The blast furnace slag flushing water vapor waste heat utilization white water removal system as claimed in claim 1, wherein the exhaust steam collection device comprises an exhaust steam collection cover arranged on the slag runner, and the exhaust steam collection cover is communicated with the exhaust steam cavity through an exhaust steam delivery pipe.

3. The blast furnace slag flushing water vapor waste heat utilization white water eliminating system as claimed in claim 2, wherein a cyclone fan is arranged on the exhaust steam delivery pipe.

4. The blast furnace slag flushing water vapor waste heat utilization white discharge system as claimed in claim 1, wherein a condensate collecting tank is arranged at the bottom of the steam exhaust cavity and is located at a position below the condensing heat exchanger.

5. The blast furnace slag flushing water vapor waste heat utilization white water eliminating system as claimed in claim 1, wherein a flue gas guide plate is arranged at the connecting position of the steam exhaust cavity and the condensing heat exchanger.

6. The blast furnace slag flushing water vapor waste heat utilization white water eliminating system as claimed in claim 1, wherein a condensate pipe is wound on the condensing heat exchanger, and a water inlet of the condensate pipe is positioned above a water outlet.

7. The blast furnace slag flushing water vapor waste heat utilization white-eliminating system as claimed in claim 1, wherein the bottom of the electromagnetic white-eliminating device is connected with the condensing heat exchanger, and the top is provided with a chimney.

Technical Field

The invention relates to the technical field of heat treatment equipment, in particular to a blast furnace slag flushing steam waste heat utilization and whitening system.

Background

The blast furnace slag flushing water is used as a low-temperature waste heat source, has the characteristics of stable temperature and large flow, and how to make the slag flushing water exert the benefit of waste heat utilization is also a research subject gradually. The blast furnace slag treatment process in China is mainly a water quenching slag process mode. High-temperature furnace slag at 1400-1500 deg.c in blast furnace flows out through slag hole and is made to pass through slag channel and slag flushing channel, and the slag is made to pass through impact quenching in certain water amount, water pressure and channel gradient.

The blast furnace slag washing water treatment method widely used in China at present comprises the following steps:

1. a direct treatment method: directly heating the slag flushing water after treatment. The intermediate cost is high, the process is complex, the water quality of the water supply is poor, and the heating pipeline is easy to block and corrode. The steel mill of northeast uses at home for the earliest, uses not can not use a heating season and will expose the problem, and at system end speed and temperature reduction, lost the effect of erodeing, the suspended solid is very easily deposited, causes the pipe blockage, influences the warm effect in end. In addition, as the total dissolved solid matters of the slag flushing water are too high, the water balance is easy to break, and substances with low solubility are easy to separate out to form loose scale, thereby causing the blockage of a tail end pipeline.

2. Simple filtering and heat exchange treatment: and (4) simply filtering the slag flushing water, then entering a heat exchanger for heat exchange, and heating clean water after heat exchange. The method has the advantages that the supplied water is clean water, and the heating pipeline cannot be blocked in a short time. The defects are that the method is only suitable for a blast furnace slag flushing system of a bottom filtration method, is not suitable for blast furnace slag flushing water for slag removal by a drawing pulling method and a printing bar method, and is very easy to cause heat exchanger blockage with short heat source. In addition, because the temperature of blast furnace slag flushing water by a bottom filtration method is originally low (70 ℃ at most), the temperature after heat exchange is difficult to reach more than 55 ℃, the heat exchange temperature difference is more than 10 ℃, the heating temperature in winter can be ensured only by increasing the capacity of heating pipes and heating radiators in users, and if the construction is a reconstruction project, the reconstruction investment of the heating pipes is very large.

3. Treating by a Mingte method: the metallurgical furnace slag is flushed into a grain slag mixture by utilizing a flushing box, the slag in the grain slag mixture is separated by a stirring cage machine, and the grain slag mixture is dehydrated into dry slag to be transported for sale; the slag flushing water is filtered into clean water by a filter and is circularly supplied to the slag flushing of the flushing box by a slag flushing pump. The Mingte-method water granulated slag treatment system is used as a third-generation water granulated slag treatment technology (namely the latest technology in the field of water granulated slag), and is mainly characterized in that the defects of a slag pool method (a first-generation water granulated slag treatment technology, namely a advection method, a side filtration method and a bottom filtration method) and a rotary drum method (a second-generation water granulated slag treatment technology, namely an INBA and a drawing and drawing method) are thoroughly overcome, and the water granulated slag is treated in a full-automatic mode. The separation of the water slag is automatically completed, and the slag discharged from the equipment is dry slag; the water is clean water and can be directly recycled.

4. Jiaheng method treatment: high-temperature slag discharged from a blast furnace flows to the front of a punching box at the edge of a platform of a tapping plant through a slag ditch and is quenched by rapid water flow sprayed by the punching box to form a slag-water mixture. The slag-water mixture is conveyed into a dehydrator through a water slag channel to realize slag-water separation. The finished slag falls onto the belt conveyor through the hopper and is conveyed to a slag yard or a slag bin, and water flows into the water tank through the screen. The return water is pumped to each water using point by a pump after being precipitated for recycling, and the fine slag in the sedimentation tank is fished to a funnel above the belt conveyor through a grab bucket and is carried away by the belt conveyor.

5. Waste heat heating treatment: the heating water exchanges heat with the slag flushing circulating water through the special plate heat exchanger → is conveyed to a heating water supply main pipe → a heating user → a heating water return main pipe → a heating water filter → is pressurized through the heating water circulating pump → is conveyed to the plate heat exchanger to exchange heat with the slag flushing circulating water. The heating water is a closed circulation system, and softened water is adopted, so that scaling of pipelines and radiating fins is avoided; a constant-pressure water supplementing system is arranged in front of the heating circulating pump, and a variable-frequency water supplementing pump is adopted for automatically supplementing water. Considering the problem of heat extraction during maintenance of the blast furnace in the heating season, a steam-water heat exchanger is arranged in the heat exchange station, heating is guaranteed by adopting steam heat compensation, and condensed water is recycled to a water compensation tank for cyclic utilization.

In the iron-making process, the new water consumed in the slag flushing process accounts for more than 50 percent of the total consumption of the new water by the blast furnace slag flushing water treatment methods. About 11.2 tons of fresh water is consumed for punching 1 ton of water slag, and the amount of circulating water is about 10 tons. According to the production yield of steel in China being 5 hundred million tons, the consumption of fresh water only used for slag flushing is more than 1.5 hundred million tons calculated according to 350 kilograms of slag ratio, and the consumption of fresh water accounts for 4 percent of that of the steel industry. The physical heat of the blast furnace slag taken away by the slag flushing water accounts for about 8 percent of the energy consumption of iron making, and is about equivalent to 21 kg of standard coal (calculated according to 350 kg/ton of iron). The water temperature of the circulating water tank is 60-85 ℃, which belongs to an industrial low-temperature waste heat source, and if the water is not utilized, the energy is wasted.

In addition, in the process that blast furnace slag flushing water and steam (dead steam) flow to the slag bath along the slag runner, dense white smoke is generated when the slag is cooled. The white smoke is mixed with powder slag and various soluble salts, and the powder slag and the soluble salts are dispersed to influence the landscape of a plant area and pollute the environment; road icing is easy to form in winter, and potential safety hazards are caused.

The invention aims to solve the defects of large heat waste, high operation cost and the like caused by the existing slag flushing water treatment process and the problem of long smoke caused by slag flushing water. The purposes of waste heat recovery of blast furnace slag washing water and white removal and purification of flue gas are achieved.

Therefore, a system for utilizing waste heat of water vapor of blast furnace slag flushing and eliminating white is provided.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a blast furnace slag flushing water vapor waste heat utilization and white water elimination system.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a blast furnace sluicing steam waste heat utilization white system that disappears, includes, exhaust steam collection device and exhaust steam processing apparatus, exhaust steam collection device end is provided with the exhaust steam cavity, the exhaust steam cavity with exhaust steam processing apparatus intercommunication, exhaust steam processing apparatus includes condensation heat exchanger and electromagnetism and takes off white device, the exhaust steam cavity with the condensation heat exchanger is connected, the condensation heat exchanger with electromagnetism takes off white device and connects.

Furthermore, the exhaust steam collecting device comprises an exhaust steam collecting cover arranged on the slag runner, and the exhaust steam collecting cover is communicated with the exhaust steam cavity through an exhaust steam delivery pipe.

Furthermore, a cyclone fan is arranged on the exhaust steam delivery pipe.

Furthermore, a condensate collecting tank is arranged at the bottom of the dead steam cavity and is positioned below the condensing heat exchanger.

Furthermore, a smoke guide plate is arranged at the connecting position of the dead steam cavity and the condensing heat exchanger.

Furthermore, a condensate pipe is wound on the condensation heat exchanger, and a water inlet of the condensate pipe is positioned above the water outlet.

Furthermore, the bottom of the electromagnetic whiting device is connected with the condensing heat exchanger, and the top of the electromagnetic whiting device is provided with a chimney.

Compared with the prior art, the invention has the beneficial effects that:

through the arrangement of the invention, the waste heat utilization of the blast furnace slag flushing water is realized, and the problems of high operation cost, easy blockage and corrosion of a heating pipeline, pollution caused by the discharge of the blast furnace slag flushing water and long smoke caused by the waste heat utilization method in the traditional process are solved; the discharge amount of harmful substances in the gas discharged by the blast furnace slag flushing water is greatly reduced and is close to zero; the gas entering the condensing heat exchanger is more uniform through the arranged flue gas guide plate; the condensation heat exchanger and the exhaust steam are indirectly arranged to exchange heat in a crossed direction (a wound condensation water pipe), so that the condensation heat exchanger and the exhaust steam can quickly release and absorb heat, a medium for heating is clean, and the problem that a pipeline is easily blocked and corroded due to the traditional slag flushing water filtration heating is solved; the electromagnetic white-removing device can solve the problem that a temperature rising device is required to be added in the traditional process, so that the cost is reduced, the heat of waste heat recovery is increased, and the running cost is reduced; the condensate can be recycled for slag flushing and recycling through the arranged condensate collecting tank.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.

FIG. 1 is a schematic diagram of the overall structure of a blast furnace slag flushing water vapor waste heat utilization white water elimination system provided by the invention.

In the figure: the system comprises a slag runner-1, an exhaust steam collecting cover-2, an exhaust steam outlet pipe-3, a cyclone fan-4, a pressure flowmeter-5, an exhaust steam cavity-6, a flue gas guide plate-7, a condensing heat exchanger-8, an electromagnetic whitening device-9, a chimney-10 and a condensate collecting tank-11.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

With reference to figure 1 of the drawings,

a blast furnace slag flushing water vapor waste heat utilization and white water elimination system, which comprises a dead steam collecting device and a dead steam processing device,

the exhaust steam collecting device specifically comprises: an exhaust steam collecting cover 2, an exhaust steam eduction tube 3, a cyclone fan 4, a pressure flowmeter 5 and an exhaust steam cavity 6,

the slag runner 1 is a closed pipeline, a plurality of openings are arranged above the slag runner, an exhaust steam collecting cover 2 is arranged at the position of each opening, the inner diameter of the exhaust steam collecting cover 2 is gradually reduced from bottom to top, an exhaust steam outlet pipe 3 is arranged at the top of the exhaust steam collecting cover and is used for conveying exhaust steam into an exhaust steam cavity 6, the exhaust steam cavity 6 is respectively communicated with the slag runner 1 and the exhaust steam outlet pipe 3, a condensate collecting tank 11 is arranged at the bottom of the exhaust steam cavity, and the exhaust steam can be used for flushing slag after being subjected to sedimentation treatment by a condensing heat exchanger 8 and the like; a cyclone fan 4 is arranged in the exhaust steam outlet pipe 3 to improve the delivery efficiency of the exhaust steam, and a pressure flowmeter 5 is arranged on the exhaust steam outlet pipe 3 to detect the exhaust steam in the exhaust steam outlet pipe 3 in real time;

the steam treatment device specifically comprises: a flue gas guide plate 7, a condensing heat exchanger 8 and an electromagnetic whitening device 9,

a flue gas guide plate 7 is arranged at the connecting position of the condensing heat exchanger 8 and the exhaust steam cavity 6, so that flue gas can uniformly enter the condensing heat exchanger 8, the exhaust steam and condensed water in the condensing heat exchanger 8 carry out indirect heat exchange, the exhaust steam is condensed out through the reduction of the condensing temperature and falls into a condensed liquid collecting tank 11 arranged at the lower part, the flue gas enters an electromagnetic white removal device 9 after passing through the condensing heat exchanger 8, the flue gas is further treated to remove white smoke plumes, simultaneously, pollutants in the gas are cooperatively treated, the concentrations of particulate matters, aerosol and the like are further reduced, the emission of the substances in the gas is close to zero, and the purified gas is discharged from a chimney 10 arranged at the top;

in other embodiments, a condensate pipe is wound on the condensing heat exchanger 8, and a water inlet of the condensate pipe is located above the water outlet.

The invention has the following use process:

1) the exhaust steam is collected by the exhaust steam collecting cover 2, enters the exhaust steam cavity 6 through the exhaust steam outlet pipe 3, uniformly enters the condensing heat exchanger 8 through the flue gas guide plate 7, is cooled and exchanges heat to release latent heat, and then enters the electromagnetic de-whitening device 9 to enable the emission of substances in the gas to approach zero and be discharged through the chimney 10.

2) And cooling water enters the condensing heat exchanger 8 to exchange heat with the exhaust steam to absorb the heat in the exhaust steam, so that the temperature is increased, and the cooling water can be used for heating and the like to achieve the purpose of waste heat utilization and energy conservation.

3) And the dead steam condensate water enters a condensate collecting tank 11 and can be used as flushing slag after being treated by sedimentation and the like. The purpose of saving water is achieved.

Through the steps, the slag flushing water exhaust steam reaches the discharge approaching zero, the heat energy in the exhaust steam is utilized for other purposes, the condensed water in the exhaust steam is recovered, and the purposes of saving energy, saving water and reducing pollution are achieved.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.