CN217297904U - System for recovering waste heat of blast furnace slag flushing water - Google Patents
System for recovering waste heat of blast furnace slag flushing water Download PDFInfo
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- CN217297904U CN217297904U CN202220037191.9U CN202220037191U CN217297904U CN 217297904 U CN217297904 U CN 217297904U CN 202220037191 U CN202220037191 U CN 202220037191U CN 217297904 U CN217297904 U CN 217297904U
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Abstract
The utility model discloses a system for retrieving blast furnace slag washing water waste heat, including the one-level flash column, the second grade flash column, tertiary condensation heat transfer tower, the one-level heat exchanger, second grade heat exchanger and tertiary heat exchanger, the lower part and the second grade flash column intercommunication of tertiary condensation heat transfer tower, the bottom of second grade flash column and the top intercommunication of one-level flash column, the second grade heat exchanger passes through tube coupling second grade flash column, the one-level heat exchanger passes through tube coupling one-level flash column, second grade heat exchanger and one-level heat exchanger pass through tube coupling, tertiary heat exchanger sets up the top at tertiary condensation heat transfer tower, tertiary heat exchanger passes through pipeline and second grade heat exchanger intercommunication, the one-level heat exchanger passes through pipeline and tertiary heat exchanger intercommunication, one-level flash column bottom intercommunication slag washing pond. The circulating water is heated in three stages, high-temperature hot water with the temperature of over 90 ℃ can be stably obtained, the high-temperature hot water is used for heating in winter, the hot water type lithium bromide refrigerator is used for driving to prepare chilled water in summer, dehumidification and air blowing of a blast furnace are carried out, and waste heat is fully recovered and utilized all year round.
Description
Technical Field
The utility model belongs to the technical field of steel industry waste heat resource comprehensive utilization, in particular to a system for retrieving blast furnace slag washing water waste heat.
Background
Under the large background of promoting carbon peak reaching and carbon neutralization all over the world, the steel industry still has the highest energy consumption in the existing industrial system, and the energy conservation and emission reduction to the maximum extent are the basic requirements of the current steel industry for healthy development. Although the blast furnace slag dry processing technology has advanced greatly, the blast furnace slag water quenching process still occupies an absolute dominance. The water quenching treatment is carried out on the liquid slag directly discharged from the blast furnace and the temperature of the liquid slag is more than 1500 ℃, which is still the most stable, reliable and safe treatment process at present, and a large amount of high-temperature slag flushing water is generated in the water quenching treatment process of the high-temperature liquid slag; the slag flushing water with the temperature of over 90 ℃ can not only cause the activity of the water quenching slag to be poor, but also can meet the safe operation of a water slag flushing system by adding a cooling tower for forced cooling; in the traditional blast furnace slag water quenching production process, not only a large amount of industrial fresh water is consumed, but also the waste heat of the blast furnace slag can not be fully recycled, thereby causing the waste of energy.
The main mode of recycling the waste heat of the traditional blast furnace slag flushing water is to improve the temperature of heating water by exchanging heat through dividing wall type heat exchangers in various forms and to supply heat in winter; the hot water type slurry pump extracts slag flushing water from the slag pool, conveys the slag flushing water to the heat exchange station, and returns to the slag flushing slag pool again after passing through the dividing wall type heat exchanger; because the blast furnace slag flushing water has poor water quality, has the characteristics of low temperature, more impurities, easy sedimentation and the like, the heat exchange system has low efficiency, frequent faults and high overhaul rate.
SUMMERY OF THE UTILITY MODEL
The utility model provides a system for be used for retrieving blast furnace slag flushing water waste heat not only can solve the influence that blast furnace slag flushing water quality of water is poor, easy siltation blocks up heat transfer system steady operation, can also improve the waste heat recovery quality simultaneously, obtains the high temperature circulating water.
The utility model provides a pair of a system for retrieving blast furnace slag flushing water waste heat, including one-level flash column, second grade flash column, tertiary condensation heat transfer tower, one-level heat exchanger, second grade heat exchanger and tertiary heat exchanger, the lower part and the second grade flash column intercommunication of tertiary condensation heat transfer tower, the bottom of second grade flash column and the top intercommunication of one-level flash column, the second grade heat exchanger passes through tube coupling second grade flash column, the one-level heat exchanger passes through tube coupling one-level flash column, second grade heat exchanger and one-level heat exchanger pass through tube coupling, tertiary heat exchanger sets up the top at tertiary condensation heat transfer tower, tertiary heat exchanger passes through pipeline and second grade heat exchanger intercommunication, the one-level heat exchanger passes through pipeline and tertiary heat exchanger intercommunication, one-level flash column bottom intercommunication slag flushing water pool.
Preferably, the bottom of the third-stage condensation heat exchange tower is connected with a high-pressure water pump with the pressure of 0.3-0.4Mpa through a pipeline.
Preferably, a grid is arranged at the communication position of the third-stage condensation heat exchange tower and the second-stage flash evaporation tower.
Preferably, the second grade flash column is equipped with flow control device, flow control device includes plunger, plunger stick hoisting device, motor connection plunger stick hoisting device the one end of plunger stick hoisting device connection plunger stick, motor and plunger stick hoisting device are located the second grade flash column outside, the plunger stick runs through the second grade flash column, the plunger is fixed to the other end of plunger stick.
Preferably, an atomization device is fixed inside the first-stage flash tower, and a liquid level meter is fixed outside the first-stage flash tower.
Preferably, a slag pushing pump is arranged on the side face of the slag flushing water tank, and a cobblestone filtering layer is paved at the bottom of the slag flushing water tank.
Preferably, the second-stage flash tower is connected with an overflow pipe, and one end of the overflow pipe extends into the slag flushing water tank.
Preferably, the secondary heat exchanger and the primary heat exchanger adopt plate-type steam-water heat exchangers, and the tertiary heat exchanger adopts a fin-type heat exchanger.
The utility model has the advantages that:
the system disclosed by the patent can be used for carrying out three-stage heating on the closed circulating water, can stably obtain high-temperature hot water with the temperature of more than 90 ℃, is used for heating in winter, and is used for driving the hot water type lithium bromide refrigerator to prepare chilled water in summer, carrying out dehumidification blowing on the blast furnace, reducing the comprehensive energy consumption of the blast furnace, improving the COP value of the bromine refrigerator, fully recycling and utilizing the waste heat all the year round, and obtaining remarkable economic benefits; the process saves the engineering investment and energy consumption cost of pumping water to a heat exchange station for heat exchange by the traditional slurry pump, saves the cost, and has more reliable operation and lower energy consumption.
Drawings
FIG. 1 is a schematic diagram of the system structure for recovering the waste heat of the blast furnace slag flushing water of the utility model.
The attached drawings are marked as follows:
the device comprises a secondary flash tower 1, a primary flash tower 2, a tertiary condensation heat exchange tower 3, a secondary heat exchanger 4, a primary heat exchanger 5, a tertiary heat exchanger 6, a slag flushing water tank 7, a high-pressure water pump 8, a grid 9, a flow control device 10, an atomization device 11, a liquid level meter 12, a slag pushing pump 13, an overflow pipe 14, a cobble filtering layer 15, a plunger 101, a plunger rod 102, a plunger rod lifting device 103, a motor 104, a slag runner 100, a granulation head 200 and a hot water type lithium bromide refrigerator 300.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be described in detail with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the scope of the invention.
The embodiment of the utility model provides a following, as shown in figure 1 a system for retrieving blast furnace slag flushing water waste heat, including second grade flash column 1, first grade flash column 2, tertiary condensation heat transfer tower 3, second grade heat exchanger 4, first grade heat exchanger 5 and tertiary heat exchanger 6, the lower part of tertiary condensation heat transfer tower 3 communicates with second grade flash column 1, the bottom of second grade flash column 1 communicates with the top of first grade flash column 2, second grade heat exchanger 4 connects second grade flash column 1 through the pipeline, first grade heat exchanger 5 connects first grade flash column 2 through the pipeline, second grade heat exchanger 4 and first grade heat exchanger 5 connect through the pipeline, tertiary heat exchanger 6 sets up at the top of tertiary condensation heat transfer tower 3, tertiary heat exchanger 6 communicates with second grade heat exchanger 4 through the pipeline, first grade heat exchanger 5 communicates with tertiary heat exchanger 6 through the pipeline, the bottom of the first-stage flash tower 2 is communicated with a slag flushing water tank 7. As shown in fig. 1, slag is in a slag runner 100, the slag enters a third-stage condensation heat exchange tower 3, slag flushing water sprayed by a granulating head 200 is used for cooling the slag, the third-stage condensation heat exchange tower 3 is at normal pressure, a second-stage flash tower 1 is in a negative pressure state, so that the slag flushing water carrying the slag can easily enter the second-stage flash tower 1, the negative pressure environment is provided by the rapid condensation process of flash evaporation exhaust gas, the liquid level in the second-stage flash tower 1 is higher than that in the third-stage condensation heat exchange tower 3, but the highest water level is controlled by an overflow pipe 14. The water vapor generated in the secondary flash tower 1 exchanges heat with the secondary heat exchanger 4, and the circulating water circulating in the secondary heat exchanger 4 is heated. The slag flushing water carries slag to enter a first-stage flash tower 2 from a second-stage flash tower 1, the water discharge is controlled by a flow control device 10, and the water is uniformly discharged into the first-stage flash tower 2. The primary flash tower 2 is directly connected with the slag flushing water tank 7 and is sealed through water, under the negative pressure state, the liquid level in the primary flash tower 2 is obviously higher than the liquid level in the slag flushing water tank 7, water vapor generated in the primary flash tower 2 exchanges heat with the primary heat exchanger 5, and circulating water circulating in the primary heat exchanger 5 is heated. Because the secondary heat exchanger 4 is communicated with the primary heat exchanger 5, the circulating water after heat exchange from the primary heat exchanger 5 can be directly introduced into the secondary heat exchanger 4 for further heat exchange and temperature increase. Because the secondary heat exchanger 4 and the tertiary heat exchanger 6 are communicated, the circulating water heated by the secondary heat exchanger 4 further flows into the tertiary heat exchanger 6 for heat exchange, the temperature of the circulating water subjected to heat exchange by the tertiary heat exchanger 6 can reach more than 90 degrees, the circulating water can be directly used for heating in winter, and is used for driving the hot water type lithium bromide refrigerator 300 to prepare chilled water at 7-10 ℃ in summer for dehumidification and air blowing of the blast furnace, so that the comprehensive energy consumption of the blast furnace is reduced, and the annual recovery and utilization of waste heat are realized.
As a preferable embodiment of the embodiment, the bottom of the three-stage condensation heat exchange tower 3 is connected with a high-pressure water pump 8 with the pressure of 0.3-0.4Mpa through a pipeline, so that the slag-water mixture at the bottom is ensured not to be locally deposited.
As a preferred embodiment of this embodiment, the grid 9 is disposed at the communication position between the third-stage condensation heat exchange tower 3 and the second-stage flash evaporation tower 1, so as to prevent large slag generated in an abnormal production state from entering the second-stage flash evaporation tower 1, and when an abnormal condition occurs, only the granulation head 200 needs to be stopped, the slag flushing water in the third-stage condensation heat exchange tower 3 needs to be emptied, and the foreign matter is taken out, so that the second-stage flash evaporation tower 1 is not affected.
As a preferred embodiment of this embodiment, the secondary flash tower 1 is provided with a flow control device 10, the flow control device 10 includes a plunger 101, a plunger rod 102, a plunger rod lifting device 103, and a motor 104, the motor 104 is connected with the plunger rod lifting device 103, one end of the plunger rod lifting device 103 is connected with the plunger rod 102, the motor 104 and the plunger rod lifting device 103 are located outside the secondary flash tower 1, the plunger rod 103 penetrates through the secondary flash tower 1, and the plunger 101 is fixed at the other end of the plunger rod 103. The flow control device 10 is improved according to the structure of a plunger valve, the plunger rod 102 can move up and down under the control of the plunger rod lifting device 103, the plunger 101 is conical, when the height of the plunger 101 is lower and lower, the flow of water is smaller and smaller, and the plunger 101 completely descends to the bottom to block the lower outlet of the secondary flash tower 1.
As a preferred embodiment of this embodiment, the atomizing device 11 is fixed inside the first-stage flash tower 2, the liquid level meter 12 is fixed outside the first-stage flash tower 2, when the inflow of the first-stage flash tower 2 is greater than the drainage flow, the liquid level inside the first-stage flash tower will exceed the threshold value of the liquid level meter 12, at this time, the inflow of the water needs to be increased, the plunger 101 is controlled to rise, the gap between the plunger 101 and the bottom opening of the second-stage flash tower 1 is increased, otherwise, the plunger 101 needs to be controlled to fall, and the dynamic balance between the second-stage flash tower 1 and the first-stage flash tower 2 is achieved. The bottom of the first-stage flash tower 2 is completely open, no siltation is caused, the water body is kept stable, and water is boiled violently under the negative pressure environment to generate stable water vapor.
As a preferred embodiment of the present embodiment, a slag pushing pump 13 is disposed on the side of the slag flushing water tank 7, and pushes the water-quenched slag collected at the bottom of the primary flash tower 2 to a slag grabbing area in the slag flushing water tank 7, so as to keep the bottom of the primary flash tower 2 smooth.
As a preferred embodiment of this embodiment, the second-stage flash tower 1 is connected to an overflow pipe 14, one end of the overflow pipe 14 extends into the slag flushing water tank 7, when the flow rate of the slag flushing water is greater than the discharge flow rate, the excess slag flushing water can be discharged from the overflow pipe 14, and at the same time, the overflow pipe also plays a role of water sealing, and besides the water sealing, the second-stage flash tower 1 also needs to be provided with a sealing valve at a position where the plunger 101 contacts with the tower body, so as to ensure that the inside of the tower is in a stable negative pressure state. A cobblestone filter layer 15 is arranged in the slag flushing water tank 7.
As a preferred embodiment of this embodiment, the secondary heat exchanger 4 and the primary heat exchanger 5 adopt plate-type steam-water heat exchangers, and the tertiary heat exchanger 6 adopts a fin-type heat exchanger.
High-temperature slag enters the three-stage condensation heat exchange tower 3 through the slag runner 100, is directly crushed by high-pressure slag flushing water and is quenched by water, the water temperature instantly reaches the boiling point, the high-temperature slag is evaporated violently, the slag falls on the bottom of the tower, a large amount of steam with the same boiling point is generated at the same time, the surface of the steam three-stage heat exchanger 6 is condensed to release latent heat, and circulating water is heated in a three-stage manner; the slag-water mixture falling on the bottom of the tower enters a secondary flash tower 1 through a grid 9, the temperature of water in the tower is at the boiling point, the negative pressure in the tower is reduced, slag flushing water is continuously and violently boiled, generated water vapor is automatically conveyed to a secondary heat exchanger 4, and circulating water is heated in the secondary flash tower; then the slag-water mixture enters a first-stage flash tower 2 through a gap between a plunger 101 and an opening at the bottom of the tower, a powerless mechanical atomization device 11 is arranged in the tower to improve the surface area of the slag-water mixture and improve the flash evaporation efficiency, the generated water vapor carries out first-stage heating on circulating water, water-quenched slag which is freely settled at the bottom of the tower is pushed to a slag grabbing area by a slag pushing pump 13, and subsequent slag grabbing operation is carried out.
The circulating water is heated to more than 90 ℃ from the first-stage flash evaporation heat extraction and the second-stage flash evaporation tower flash evaporation heat extraction to the third-stage condensation heat exchange, the temperature is gradually increased, and because the temperature of steam generated in the slag water quenching process is close to 100 ℃, the steam releases latent heat in the condensation process; compared with a heat exchange removing station in a slag flushing water pool extracted by a slag slurry pump in the traditional process, the heat obtained by the embodiment is more; more importantly, the system in this embodiment has smooth material flow, without causing blockage of the water-quenched slag; the power required by the flash evaporation process mainly comes from the negative pressure environment formed by rapid condensation and rapid volume reduction of flash evaporation exhaust gas, and part of non-condensable gas can be directly pumped out by a vacuum pump; the full recovery and the high-efficiency utilization of the waste heat of the blast furnace slag flushing water are realized.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations are also considered to be the protection scope of the present invention.
Claims (8)
1. The utility model provides a system for be used for retrieving blast furnace slag washing water waste heat which characterized in that: including one-level flash column, second grade flash column, tertiary condensation heat transfer tower, one-level heat exchanger, second grade heat exchanger and tertiary heat exchanger, the lower part and the second grade flash column intercommunication of tertiary condensation heat transfer tower, the bottom of second grade flash column and the top intercommunication of one-level flash column, the second grade heat exchanger passes through the tube coupling second grade flash column, the one-level heat exchanger passes through the tube coupling one-level flash column, second grade heat exchanger and one-level heat exchanger pass through the tube coupling, tertiary heat exchanger sets up the top at tertiary condensation heat transfer tower, tertiary heat exchanger passes through pipeline and second grade heat exchanger intercommunication, the one-level heat exchanger passes through pipeline and tertiary heat exchanger intercommunication, one-level flash column bottom intercommunication flushing slag pond.
2. The system for recovering the waste heat of the blast furnace slag washing water as claimed in claim 1, wherein: the bottom of the third-stage condensation heat exchange tower is connected with a high-pressure water pump with the pressure of 0.3-0.4Mpa through a pipeline.
3. The system for recovering the waste heat of the blast furnace slag washing water as claimed in claim 1, wherein: and a grid is arranged at the communication position of the third-stage condensation heat exchange tower and the second-stage flash evaporation tower.
4. The system for recovering the waste heat of the blast furnace slag washing water as claimed in claim 1, wherein: second grade flash column is equipped with the flow control device, flow control device includes plunger, plunger stick hoisting device, motor connection plunger stick hoisting device the one end of plunger stick hoisting device connection plunger stick, motor and plunger stick hoisting device are located the second grade flash column outside, the plunger stick runs through the second grade flash column, the plunger is fixed to the other end of plunger stick.
5. The system for recovering the waste heat of the blast furnace slag washing water as claimed in claim 1, wherein: and an atomization device is fixed in the first-stage flash tower, and a liquid level meter is fixed outside the first-stage flash tower.
6. The system for recovering the waste heat of the blast furnace slag washing water as claimed in claim 1, wherein: the slag flushing water tank is provided with a slag pushing pump on the side surface and a cobble filtering layer on the bottom.
7. The system for recovering the waste heat of the blast furnace slag washing water as claimed in claim 6, wherein: the second-stage flash tower is connected with an overflow pipe, and one end of the overflow pipe extends into the slag flushing water tank.
8. The system for recovering the waste heat of the blast furnace slag washing water as claimed in claim 1, wherein: the secondary heat exchanger and the primary heat exchanger adopt plate type steam-water heat exchangers, and the tertiary heat exchanger adopts a fin type heat exchanger.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220037191.9U CN217297904U (en) | 2022-01-07 | 2022-01-07 | System for recovering waste heat of blast furnace slag flushing water |
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| CN202220037191.9U CN217297904U (en) | 2022-01-07 | 2022-01-07 | System for recovering waste heat of blast furnace slag flushing water |
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| CN217297904U true CN217297904U (en) | 2022-08-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114317847A (en) * | 2022-01-07 | 2022-04-12 | 青岛特殊钢铁有限公司 | System and method for recovering waste heat of blast furnace slag flushing water |
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- 2022-01-07 CN CN202220037191.9U patent/CN217297904U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114317847A (en) * | 2022-01-07 | 2022-04-12 | 青岛特殊钢铁有限公司 | System and method for recovering waste heat of blast furnace slag flushing water |
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