Waste heat recycling device of wet quenching system

Abstract

The utility model discloses a waste heat recycling device of a wet quenching system, which comprises a recycling box, a heat accumulator and a heat exchanger, the inside of the recycling box is divided into a water inlet chamber, a washing chamber and a heat exchange chamber, a hollow shaft is vertically arranged in the water inlet chamber, the lower end of the hollow shaft extends into the washing chamber, and then a plurality of spray pipes are uniformly distributed on the circumference; a plurality of spray nozzles are evenly distributed on each spray pipe in the length direction of the spray pipe, a through hole is formed in the hollow shaft in the water inlet chamber, a plurality of spiral coil pipes are concentrically arranged in the heat exchange chamber, inner pipes are concentrically arranged in the coil pipes, a water drainage pipe and an air inlet pipe are arranged on the upper portion and the lower portion of the heat exchange chamber respectively, and lower ports of the coil pipes are communicated with the air inlet pipe. The upper port of the inner pipe is communicated with the washing chamber, the lower port of the inner pipe is communicated with the heat exchange chamber, the air inlet pipe is communicated with the heat accumulator, and the drain pipe is communicated with the heat exchanger. In conclusion, the waste heat recovery device has the advantages of full contact between steam and water mist, good waste heat recovery effect and high recovery rate.

Description

TECHNICAL FIELD

[0001] The utility model relates to a coke residual heat recycling device of wet coke quenching system. BACKGROUND

[0002] In the coking process, the high-temperature coke discharged from the coking furnace needs to be handled through a series of processes such as coke quenching, coke cooling, coke screening, and coke storage. Wet coke quenching is often used in coke quenching. Wet coke quenching is a method in which a coke car is used to carry the red coke discharged from the coking furnace to a coke quenching tower, and a large amount of water is sprayed onto the red coke just discharged from the coking furnace to achieve the purpose of extinguishing and cooling the coke. During wet coke quenching, the coke pushed out from the coking furnace has a temperature of about 1000℃, and after being cooled by water spraying to about 150℃, the coke is cooled. During the coke quenching process, water vaporizes to produce a large amount of steam due to heat, and direct discharge will undoubtedly cause waste and loss of energy and pollution to the environment.

[0003] In order to avoid waste of energy, a residual heat recycling device is used to recycle the residual heat during the wet coke quenching process. However, there are still problems in the recycling process: first, the existing residual heat recovery is through water mist contacting high-temperature steam to liquefy the high-temperature steam into water. However, the high-temperature steam moves too fast, so that the high-temperature steam cannot fully contact the water mist, resulting in low residual heat recovery efficiency and waste of steam residual heat. Second, due to the discontinuity of the coke quenching process, the steam generation is intermittent, discontinuous, and the steam quantity is unstable. The residual heat recovery device cannot recover the large amount of steam residual heat generated instantaneously, and the recovery rate of steam residual heat is not high. Therefore, it is an objective need to develop a coke quenching system residual heat recycling device with sufficient steam and water mist contact, good residual heat recovery effect, and high recovery rate. SUMMARY

[0004] The utility model aims at providing a coke quenching system residual heat recycling device with sufficient steam and water mist contact, good residual heat recovery effect, and high recovery rate.

[0005] The utility model discloses a heat recovery device which comprises a recovery tank, a heat accumulator and a heat exchanger.

[0006] Further, the cold water outlet of the heat exchanger is communicated with the water inlet pipe through a pipeline.

[0007] Further, the spray heads on the adjacent two spray pipes are arranged alternately.

[0008] Further, the lower part of the washing chamber is provided with a filler layer.

[0009] Further, a dehumidifier is arranged in the washing chamber between the exhaust pipe and the spray pipe.

[0010] Further, the upper end of the upper air pipe is provided with a water baffle.

[0011] Further, a heat exchange pipe is arranged in the water inlet chamber, the inlet end of the heat exchange pipe is communicated with the exhaust pipe, and the outlet end of the heat exchange pipe extends to the outside of the water inlet chamber.

[0012] The utility model discloses a wet quenching system, and the wet quenching system is characterized by comprising a recovery tank, a heat accumulator, a heat exchanger, a water inlet chamber, a washing chamber, a heat exchange chamber, a hollow shaft and a spray pipe, wherein the heat accumulator is arranged on the recovery tank, the heat exchanger is arranged on the heat accumulator, the water inlet chamber is arranged on the heat exchanger, the washing chamber is arranged on the heat exchanger, the heat exchange chamber is arranged on the washing chamber, the hollow shaft is arranged on the heat exchange chamber, and the spray pipe is arranged on the hollow shaft. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the whole structure schematic diagram of the utility model;

[0014] In the drawing: 1-recovery tank, 2-heat accumulator, 3-heat exchanger, 4-water inlet chamber, 5-washing chamber, 6-heat exchange chamber, 7-hollow shaft, 8-spray pipe, 9-coil pipe, 10-inner tube, 11-air inlet pipe, 12-packing layer, 13-dehumidifier, 14-water baffle cover, 15-heat exchange pipe. DETAILED DESCRIPTION

[0015] The utility model makes further illustration to the utility model in combination with the drawings, but does not limit the utility model in any way, and any change or improvement based on the utility model belongs to the protection scope of the utility model.

[0016] As Figure 1 The utility model discloses a recycling tank 1, heat accumulator 2 and heat exchanger 3, heat accumulator 2 and heat exchanger 3 are prior art, heat accumulator 2 is used to store steam, average steam temperature, balance steam pressure, make steam can steady output, heat exchanger 3 is used to absorb the heat in hot water, be convenient for subsequent use, recycling tank 1 is separated into water inlet chamber 4, washing chamber 5 and heat exchange chamber 6 from top to bottom by upper baffle and lower baffle in succession, be provided with water inlet pipe on the lateral wall of water inlet chamber 4, be provided with hollow shaft 7 vertically in water inlet chamber 4, the upper end of hollow shaft 7 is stretched to the top of recycling tank 1 and is driven connection has motor after, the lower end of hollow shaft 7 is stretched into washing chamber 5 and is circularly distributed with multiple spray pipes 8 after, along its length direction is distributed with multiple spray heads on each spray pipe 8, be provided with through -hole on the hollow shaft 7 in water inlet chamber 4, be provided with exhaust pipe in the upper portion of washing chamber 5, be provided with multiple spiral disc pipes 9 concentrically in heat exchange chamber 6, be provided with inner tube 10 concentrically in disc pipe 9, the upper end of disc pipe 9 is communicated with washing chamber 5 through upper air pipe, and the upper end of upper air pipe is stretched into the inside of washing chamber 5, and the upper end of upper air pipe is higher than the bottom of washing chamber 5 one end distance, prevent the hot water falling in the bottom of washing chamber 5 directly from the upper end of upper air pipe and enter therein, be provided with drain pipe and air inlet pipe 11 in the upper portion and lower portion of heat exchange chamber 6 respectively, the lower end of disc pipe 9 is communicated with air inlet pipe 11, the upper end of inner tube 10 is communicated with washing chamber 5, and the lower end is communicated with heat exchange chamber 6, air inlet pipe 11 is communicated with heat accumulator 2, and drain pipe is communicated with heat exchanger 3.

[0017] The utility model runs, the steam produced in the quenching process of wet quenching system is led into heat accumulator 2, carries out the mixing of steam in heat accumulator 2, average steam temperature, stabilizes the output pressure of steam, steam enters each disc pipe 9 through air inlet pipe 11, enters the annular space between disc pipe 9 and inner tube 10, flows from bottom to top in the space, reaches the upper end of disc pipe 9 and enters washing chamber 5 through upper air pipe, simultaneously, starts motor, and motor drives hollow shaft 7 and spray pipe 8 to rotate, cold water enters water inlet chamber 4 from water inlet pipe, enters hollow shaft 7 through through -hole, flows down along hollow shaft 7, then shunts and enters each spray pipe 8, sprays out through spray head, and water mist floats from top to bottom, and reversely contacts with the steam flowing upward, and water mist absorbs the heat in steam and forms hot water, and the heat in steam is condensed into droplets, and falls into the bottom of washing chamber 5 along with water mist, and non-condensable gas is discharged from exhaust pipe, and hot water enters inner tube 10, and flows from top to bottom in inner tube 10, and enters heat exchange chamber 6 from the lower end of inner tube 10, and finally is discharged into heat exchanger 3 from drain pipe, and the heat in hot water is absorbed by cold medium and utilized.

[0018] In the utility model, the inner tube 10 is arranged in each coil pipe 9, and the steam flows in the space between the coil pipe 9 and the inner tube 10, the water in the inner tube 10 and the water in the heat exchange chamber 6 absorb the heat in the steam from the inner and outer sides simultaneously, can quickly and efficiently absorb the heat in the steam, and compared with the traditional waste heat recovery device, the steam will flow spirally in the coil pipe 9 first, increases the heat exchange distance and heat exchange time, can absorb the heat in the steam more fully, completes the first absorption of the heat in the steam, then the steam enters the washing chamber 5, the water mist sprays from the nozzle, and the nozzle is in the rotating state, after the water mist sprays, due to the action of inertia, will form a cyclone, can contact and exchange heat with the rising steam more fully, and then better completes the second absorption of the steam heat, the steam can be liquefied into water after two heat absorption processes, improves the steam waste heat recovery efficiency, and reduces the waste of steam waste heat; Secondly, the heat accumulator 2 is arranged, the steam is balanced in temperature and output pressure, the steam is stably and continuously conveyed into the recovery tank 1, and then the problem that the steam waste heat recovery is not timely and complete due to the unstable and discontinuous steam output is avoided, and the steam waste heat recovery rate and the utilization after the waste heat recovery are ensured.

[0019] The cold water outlet of the heat exchanger 3 is communicated with the water inlet pipe through the pipeline. The cold water enters the recovery tank 1 and absorbs the steam heat to form hot water in the recovery tank 1, the hot water is sent into the heat exchanger 3, the heat in the hot water is absorbed by the cold medium such as washing oil and cold water, the cold water with lower temperature is returned to the recovery tank 1 for continuous use, the water resource is recycled, and the utilization efficiency of the water resource can be improved.

[0020] The nozzles on the adjacent two spray pipes 8 are arranged staggeredly, the nozzles are arranged on the spray pipes 8 and rotate with the spray pipes 8, if the arrangement positions of the nozzles are same, the water mist blank area can be generated in the local area of the washing chamber 5, then the effective contact space of the water mist and the steam is reduced, and the steam heat absorption efficiency is reduced, in order to avoid the problem, the nozzles on the adjacent two spray pipes 8 are arranged staggeredly, the water mist can fill each part of the washing chamber 5, and the steam heat recovery efficiency is improved.

[0021] The lower part in the washing chamber 5 is provided with the filler layer 12, the filler layer 12 has two effects, one is that the steam flows from bottom to top, but the distribution on the cross section of the washing chamber 5 is not uniform, the full contact of the steam and the water mist is affected, after the filler layer 12 is arranged, when the steam passes through the filler layer 12, the filler layer 12 can make the distribution more uniform, and the full contact of the steam and the water mist is beneficial, the other is that the water mist falls into the filler layer 12, the moisture in the filler layer 12 is saturated, when the steam passes through the filler layer 12, the steam contacts the moisture, and then the steam and water heat exchange efficiency is improved, and the steam heat absorption efficiency is improved.

[0022] A dehumidifier 13 is arranged in the scrubbing chamber 5 between the exhaust pipe and the nozzle 8. The steam is in contact with the water mist in the scrubbing chamber 5 in a reverse direction to achieve condensation, but also causes the exhaust non-condensable gas to contain more water. Direct discharge will undoubtedly cause waste of water resources. In order to avoid this problem, the dehumidifier 13 is arranged. The dehumidifier 13 is a prior art that can better intercept the water in the non-condensable gas to prevent waste of water.

[0023] The upper end of the upper air pipe is provided with a water baffle 14. It is found in actual use that part of the water enters the upper air pipe from the upper end of the upper air pipe, affecting the condensation effect of the steam. After the water baffle 14 is arranged, water can be prevented from entering the upper air pipe and the coil 9 without affecting the steam delivery.

[0024] The heat exchange pipe 15 is arranged in the water inlet chamber 4. The inlet end of the heat exchange pipe 15 is in communication with the exhaust pipe, and the outlet end of the heat exchange pipe 15 extends to the outside of the water inlet chamber 4. The steam exchanges heat with the water and the water mist in the recovery tank 1, and the non-condensable gas is discharged from the exhaust pipe. However, it is found in actual production that the non-condensable gas still contains certain heat, and a small amount of steam in the non-condensable gas is not condensed. The non-condensable gas is introduced into the heat exchange pipe 15 to exchange heat with the cold water entering the water inlet chamber 4. In this way, the heat in the non-condensable gas can be further absorbed, and the steam in the non-condensable gas can be further condensed. The condensed steam can flow downward along the heat exchange pipe 15 and return to the scrubbing chamber 5 through the exhaust pipe. In this way, the waste of heat and water resources is reduced.

Claims

1. A waste heat recovery device of a wet quenching system, comprising a recovery tank (1), a regenerator (2) and a heat exchanger (3), characterized in that The recycling tank (1) is divided into water inlet chamber (4), washing chamber (5) and heat exchange chamber (6) from top to bottom by upper and lower partitions, the side wall of water inlet chamber (4) is provided with water inlet pipe, hollow shaft (7) is vertically arranged in water inlet chamber (4), the upper end of hollow shaft (7) extends to the top of recycling tank (1) and is drivingly connected with motor, the lower end of hollow shaft (7) extends into washing chamber (5) and is circumferentially provided with multiple spray pipes (8), multiple spray heads are circumferentially arranged on each spray pipe (8) along the length direction of the spray pipe, the hollow shaft (7) in water inlet chamber (4) is provided with through hole, the upper part of washing chamber (5) is provided with exhaust pipe, multiple spiral-shaped coil pipes (9) are concentrically arranged in heat exchange chamber (6), inner pipe (10) is concentrically arranged in coil pipe (9), the upper end of upper air pipe is inserted into the inside of washing chamber (5), the upper part and the lower part of heat exchange chamber (6) are respectively provided with drain pipe and air inlet pipe (11), the lower end of coil pipe (9) is communicated with air inlet pipe (11), the upper end of inner pipe (10) is communicated with washing chamber (5), the lower end is communicated with heat exchange chamber (6), air inlet pipe (11) is communicated with heat accumulator (2), drain pipe is communicated with heat exchanger (3).

2. The waste heat recovery device of a wet quenching system according to claim 1, characterized in that: The cold water outlet of heat exchanger (3) is communicated with water inlet pipe through pipeline.

3. The waste heat recovery device of a wet quenching system according to claim 1, characterized in that: The spray heads on the adjacent two spray pipes (8) are staggered arranged.

4. The waste heat recovery device of a wet quenching system according to claim 1, characterized in that: The lower part of washing chamber (5) is provided with filler layer (12).

5. The waste heat recovery device of a wet quenching system according to claim 1, wherein: The dehumidifier (13) is arranged in washing chamber (5) between exhaust pipe and spray pipe (8).

6. The waste heat recovery device of a wet quenching system according to claim 1, wherein: The upper end of upper air pipe is provided with water baffle (14).

7. The waste heat recovery device of a wet quenching system according to claim 1, wherein: Heat exchange pipe (15) is arranged in water inlet chamber (4), the inlet end of heat exchange pipe (15) is communicated with exhaust pipe, and the outlet end of heat exchange pipe (15) extends to the outside of water inlet chamber (4).

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