CN-116904214-B - Coke quenching device and method suitable for small coke oven

CN116904214BCN 116904214 BCN116904214 BCN 116904214BCN-116904214-B

Abstract

The invention belongs to the technical field of coking, and relates to a coke quenching device and a coke quenching method suitable for a small coke oven, wherein the coke quenching device comprises a coke quenching oven, a water cooling unit and a gas heat exchange cooling device, the coke quenching oven comprises an oven body and an oven door, a cooling water circulation pipe network is arranged on the side wall of an inner cavity of the oven body, a nitrogen inlet and an air outlet are arranged on the oven body, the nitrogen inlet is connected with an external nitrogen channel, a gas stop valve is arranged at the air outlet, the external nitrogen channel is connected to the nitrogen inlet through a nitrogen channel in the gas heat exchange cooling device, a water outlet of the water cooling unit is respectively connected with the cooling water inlet of the cooling water circulation pipe network and the inlet of the cooling water channel in the gas heat exchange cooling device, and the cooling water outlet of the cooling water circulation pipe network and the outlet of the cooling water channel in the gas heat exchange cooling device are both connected with a water inlet of the water cooling unit. The invention solves the defects of high coke burning loss, long coke quenching time and the like, and can ensure the stable quality of the small coke oven coke.

Inventors

LI XINGLONG
LIU QINGQING
GUO LING

Assignees

重庆钢铁股份有限公司

Dates

Publication Date: 20260505
Application Date: 20230816

Claims (4)

1. A coke quenching device suitable for a small coke oven is characterized by comprising a coke quenching oven, a water cooling unit and a gas heat exchange cooling device, wherein the coke quenching oven comprises a furnace body and a furnace door, a cooling water circulation pipe network is arranged on the side wall of an inner cavity of the furnace body, a nitrogen inlet and an air outlet are arranged on the furnace body, the nitrogen inlet is connected with an external nitrogen channel, a gas stop valve is arranged at the air outlet, the coke quenching oven is square, the furnace door is one of the side walls of the coke quenching oven, one sides of the furnace body and one side of the furnace door are in hinged sealing connection, the cooling water circulation pipe network is three groups and is respectively arranged on the three side walls of the inner cavity of the furnace body, fans are arranged at the tops of the furnace door and the furnace body for accelerating the flow of air in the coke quenching oven, and a pressure gauge for detecting the pressure of the inner cavity of the furnace body and a temperature gauge for detecting the surface temperature of coke placed in the inner cavity of the furnace body are arranged on the furnace door; the gas heat exchange cooling device is provided with a nitrogen channel and a cooling water channel for indirect heat exchange, the external nitrogen channel is connected to the nitrogen inlet through the nitrogen channel of the gas heat exchange cooling device, the water cooling unit is provided with a water outlet and a water inlet, the water outlet of the water cooling unit is respectively connected with a cooling water inlet of a cooling water circulation pipe network and an inlet of the cooling water channel in the gas heat exchange cooling device, and a cooling water outlet of the cooling water circulation pipe network and an outlet of the cooling water channel in the gas heat exchange cooling device are both connected with the water inlet of the water cooling unit so as to form a cooling water circulation loop.
2. The quenching device for small coke ovens according to claim 1, wherein three groups of cooling water circulation pipe networks are respectively provided with respective cooling water outlets and cooling water inlets, the water outlets of the water cooling units are divided into four cooling water branches, the cooling water inlets of the three groups of cooling water circulation pipe networks and the inlets of cooling water channels in the gas heat exchange cooling device are respectively connected, the cooling water outlets of the three groups of cooling water circulation pipe networks and the outlets of the cooling water channels in the gas heat exchange cooling device are respectively connected with the water inlets of the water cooling units, the four cooling water branches are respectively provided with a flowmeter, and the positions of the cooling water outlets of the three groups of cooling water circulation pipe networks corresponding to the four cooling water branches and the positions of the outlets of the cooling water channels in the gas heat exchange cooling device are also correspondingly provided with flowmeters.
3. The quenching device for small coke ovens according to claim 2, wherein a cooling water outlet main valve is arranged at the water outlet of the water cooling unit, and cooling water outlet branch valves are arranged on the four cooling water branches.
4. A quenching method suitable for small coke ovens, characterized in that a quenching device suitable for small coke ovens according to any one of claims 1-3 is adopted, and the specific steps comprise: s1, before coke in a small coke oven is discharged, a water cooling unit is started 10-20 min in advance, and a passage between a water outlet of the water cooling unit and a cooling water inlet in a cooling water circulation pipe network and a cooling water channel inlet in the gas heat exchange cooling device is started; s2, pushing coke into a coke quenching furnace after coke is discharged from a small coke furnace experiment, closing a furnace door, feeding nitrogen into the coke quenching furnace through an external nitrogen channel, and enabling the nitrogen to be cooled after heat exchange between the nitrogen and cooling water through a gas heat exchange cooling device and then enter the coke quenching furnace; S3, opening a gas stop valve to discharge the internal gas of the coke quenching furnace; s4, after the internal gas of the coke quenching furnace is completely exhausted under the action of nitrogen, closing a gas stop valve to ensure that the internal gas of the coke quenching furnace is isolated from external air; S5, after the gas stop valve is closed, continuing to introduce nitrogen for 1-2 minutes, and then stopping introducing nitrogen into the coke quenching furnace; And S6, closing a passage between a water outlet of the water cooling unit and a cooling water inlet in a cooling water circulation pipe network and an inlet of a cooling water channel in the gas heat exchange cooling device after the surface temperature of the coke is reduced to 200 ℃, and completing coke cooling.

Description

Coke quenching device and method suitable for small coke oven Technical Field The invention belongs to the technical field of coking, and relates to a coke quenching device and a coke quenching method suitable for a small coke oven. Background In the small coke oven experiment process, coal is carbonized into coke at high temperature, the temperature of the coke is higher at the moment after the small coke oven experiment is finished, and the high-temperature coke needs to be cooled so as to facilitate the follow-up relevant detection of quality and the like. In the prior art, the small coke ovens are divided into side-mounted small coke ovens, top-mounted small coke ovens and bottom-mounted small coke ovens according to the charging mode of the small coke ovens. Normally, the bottom-loading small coke oven is iron-barrel-loading coal, the side-loading small coke oven is carton-loading coal, the coke obtained through experiments cannot be sealed, coke burning loss can be generated when the coke contacts with air at high temperature, and the longer the contact time of the coke and the air at high temperature is, the more burning loss is. Therefore, wet quenching is generally adopted for the quenching mode of the bottom-mounted small coke oven and the side-mounted small coke oven. However, the contact of high-temperature coke and water in the wet quenching process can cause the sudden drop of the coke temperature to affect the coke quality, and meanwhile, the difference of the coke quality can be caused by the different water consumption, water flow and quenching operation of the coke in the wet quenching process. At present, small coke ovens installed in China and installed at the side are subjected to dry quenching, and the defects of low coke quenching rate, high coke burning loss, long coke quenching time and the like are mainly caused. Therefore, a new coke quenching device and a new coke quenching method suitable for a small coke oven based on the dry quenching principle are necessary to be provided at present, so that the defects of high burning loss, long quenching time and the like of the coke subjected to the dry quenching Jiao Zhongjiao are overcome, the small coke oven can conveniently cool red coke by applying the dry quenching, and further the coke quality is ensured. Disclosure of Invention In view of the above, the invention aims to provide a quenching device and a quenching method suitable for a small coke oven, which uses nitrogen gas for quenching and a gas stop valve to prevent air from entering the coke oven so as to reduce coke burning loss, and uses circulating cooling water in the coke oven to reduce the temperature of air in the coke oven so as to reduce the quenching time. In order to achieve the above purpose, the present invention provides the following technical solutions: The coke quenching device suitable for the small coke oven comprises a coke quenching oven, a water cooling unit and a gas heat exchange cooling device, wherein the coke quenching oven comprises an oven body and an oven door, a cooling water circulation pipe network is arranged on the side wall of an inner cavity of the oven body, a nitrogen inlet and an air outlet are arranged on the oven body, the nitrogen inlet is connected with an external nitrogen channel, and a gas stop valve is arranged at the air outlet; the gas heat exchange cooling device is provided with a nitrogen channel and a cooling water channel for indirect heat exchange, the external nitrogen channel is connected to the nitrogen inlet through the nitrogen channel of the gas heat exchange cooling device, the water cooling unit is provided with a water outlet and a water inlet, the water outlet of the water cooling unit is respectively connected with a cooling water inlet of a cooling water circulation pipe network and an inlet of the cooling water channel in the gas heat exchange cooling device, and a cooling water outlet of the cooling water circulation pipe network and an outlet of the cooling water channel in the gas heat exchange cooling device are both connected with the water inlet of the water cooling unit so as to form a cooling water circulation loop. Further, the coke quenching furnace is square, the furnace door is one of the side walls of the coke quenching furnace, one side of the furnace body is hinged and connected with one side of the furnace door in a sealing manner, and the cooling water circulation pipe networks are three groups and are respectively arranged on the three side walls of the inner cavity of the furnace body. Further, fans are arranged at the top parts of the furnace door and the furnace body, so as to accelerate the air flow in the coke quenching furnace, and a pressure gauge for detecting the pressure in the inner cavity of the furnace body and a thermometer for detecting the temperature of coke placed in the inner cavity of the furnace body are arranged on the furnace door. Further, the three groups of cooling