A coke quenching device and method suitable for a small coke oven

Abstract

This invention belongs to the field of coking technology and relates to a quenching device and method suitable for small coke ovens. It includes a quenching oven, a water-cooled unit, and a gas heat exchange cooling device. The quenching oven includes a furnace body and a furnace door, with a cooling water circulation network on the side wall of the furnace body's inner cavity. A nitrogen inlet and an air outlet are provided on the furnace body. The nitrogen inlet is connected to an external nitrogen channel, and a gas shut-off valve is provided at the air outlet. The external nitrogen channel is connected to the nitrogen inlet via a nitrogen channel in the gas heat exchange cooling device. The outlet of the water-cooled unit is connected to both the cooling water inlet of the cooling water circulation network and the inlet of the cooling water channel in the gas heat exchange cooling device. The cooling water outlet of the cooling water circulation network and the outlet of the cooling water channel in the gas heat exchange cooling device are both connected to the inlet of the water-cooled unit. This invention solves the defects of high coke burn-off and long quenching time, while ensuring stable coke quality in small coke ovens.

Description

Technical Field

[0001] This invention belongs to the field of coking technology and relates to a coke quenching device and method suitable for small coke ovens. Background Technology

[0002] During the small coke oven experiment, coal is carbonized at high temperature to become coke. After the small coke oven experiment, the coke temperature is still high, and the high-temperature coke needs to be cooled down in order to carry out subsequent quality and other related tests.

[0003] In existing technology, small coke ovens are classified into side-loading, top-loading, and bottom-loading types based on their coal loading methods. Bottom-loading small coke ovens typically use iron drums for coal loading, while side-loading small coke ovens use cardboard boxes. Experiments show that the resulting coke cannot be sealed, and contact with air at high temperatures leads to coke burn-off. The longer the contact time with air at high temperatures, the greater the burn-off. Therefore, bottom-loading and side-loading small coke ovens generally use wet quenching. However, during wet quenching, the contact between high-temperature coke and water causes a rapid drop in coke temperature, affecting coke quality. Furthermore, variations in water usage, flow rate, and quenching operation during wet quenching can all lead to differences in coke quality. Currently, dry quenching is less common for bottom-loading and side-loading small coke ovens in China, mainly due to its high coke burn-off rate and long quenching time.

[0004] Therefore, it is necessary to propose a new coke quenching device and method based on the dry quenching principle for small coke ovens, in order to overcome the disadvantages of high coke burn-off and long quenching time in dry quenching, so as to facilitate the application of dry quenching in small coke ovens for cooling red coke and thus ensure coke quality. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a coke quenching device and coke quenching method suitable for small coke ovens, which uses nitrogen for coke quenching, and uses a gas shut-off valve to prevent air from entering the coke quenching oven to reduce coke burn-off, and uses circulating cooling water in the coke quenching oven to reduce the air temperature in the coke quenching oven to reduce the coke quenching time.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A coke quenching device suitable for small coke ovens includes a coke quenching oven, a water-cooled unit, and a gas heat exchange cooling device. The coke quenching oven includes a furnace body and a furnace door, and a cooling water circulation network is provided on the side wall of the inner cavity of the furnace body. A nitrogen inlet and an air outlet are provided on the furnace body. The nitrogen inlet is connected to an external nitrogen channel, and a gas shut-off valve is provided at the air outlet.

[0008] The gas heat exchange cooling device has an indirect heat exchange nitrogen channel and a cooling water channel. The external nitrogen channel is connected to the nitrogen inlet through the nitrogen channel of the gas heat exchange cooling device. The water-cooled unit has an outlet and an inlet. Its outlet is connected to the cooling water inlet of the cooling water circulation network and the inlet of the cooling water channel in the gas heat exchange cooling device, respectively. The cooling water outlet of the cooling water circulation network and the outlet of the cooling water channel in the gas heat exchange cooling device are both connected to the inlet of the water-cooled unit to form a cooling water circulation loop.

[0009] Furthermore, the coke quenching oven is square, the oven door is one of the side walls of the coke quenching oven, the oven body and one side of the oven door are hinged and sealed together, and the cooling water circulation network consists of three sets, which are respectively arranged on the three side walls of the oven body cavity.

[0010] Furthermore, fans are provided on the top of both the furnace door and the furnace body to accelerate the airflow inside the quenching furnace, and a pressure gauge for detecting the pressure inside the furnace cavity and a thermometer for detecting the temperature of the coke placed inside the furnace cavity are provided on the furnace door.

[0011] Furthermore, each of the three sets of cooling water circulation pipe networks has its own cooling water outlet and cooling water inlet. The outlet of the water-cooled unit is divided into four cooling water branches, which are respectively connected to the cooling water inlets of the three sets of cooling water circulation pipe networks and the inlet of the cooling water channel in the gas heat exchanger cooling device. The cooling water outlets of the three sets of cooling water circulation pipe networks and the outlet of the cooling water channel in the gas heat exchanger cooling device are all connected to the inlet of the water-cooled unit. Flow meters are installed on each of the four cooling water branches, and flow meters are also correspondingly installed at the cooling water outlets of the three sets of cooling water circulation pipe networks and the outlet of the cooling water channel in the gas heat exchanger cooling device.

[0012] Furthermore, a cooling water outlet main valve is provided at the outlet of the water-cooled unit, and cooling water outlet branch valves are provided on the four cooling water branch lines.

[0013] A coke quenching method suitable for small coke ovens, the key of which lies in employing the aforementioned coke quenching device suitable for small coke ovens, the specific steps of which include:

[0014] S1: Before the coke is discharged from the small coke oven, turn on the water-cooled unit 10 to 20 minutes in advance, and open the passage between the outlet of the water-cooled unit and the cooling water inlet in the cooling water circulation network and the inlet of the cooling water channel in the gas heat exchange cooling device.

[0015] S2: After the small coke oven experiment produces coke, the coke is pushed into the quenching oven and the oven door is closed. Nitrogen is then introduced into the quenching oven through the external nitrogen channel. The nitrogen temperature is reduced after passing through the gas heat exchange cooling device and cooling water before entering the quenching oven.

[0016] S3: Open the gas shut-off valve to release the internal gas of the coke quenching oven;

[0017] S4: After all the internal gas of the coke quenching oven has been discharged under the action of nitrogen, close the gas shut-off valve to ensure that the internal gas of the coke quenching oven is isolated from the outside air.

[0018] S5: After closing the gas shut-off valve, continue to introduce nitrogen for 1-2 minutes, and then stop feeding nitrogen into the coke quenching oven;

[0019] S6: When the surface temperature of the coke drops to 200°C, close the passage between the outlet of the water-cooled unit and the inlet of the cooling water in the cooling water circulation network and the inlet of the cooling water channel in the gas heat exchange cooling device, and the coke cooling is completed.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. In the coke quenching oven, coke is cooled by cooling nitrogen. A gas shut-off valve is installed on the coke quenching oven to immediately block the contact between the outside air and the coke inside the oven after the oven is filled with nitrogen, thereby reducing coke burn-off. Secondly, by setting up a cooling water circulation network on the side wall of the coke quenching oven cavity, the temperature inside the coke quenching oven is significantly reduced to shorten the quenching time. This quenching device is particularly suitable for dry quenching of experimental coke in small coke ovens such as bottom-loaded and side-loaded ovens, solving the defects of high coke burn-off and long quenching time, while ensuring the stable quality of coke in small coke ovens.

[0022] 2. Flow meters are installed at both the outlet and inlet of the cooling water circulation network to compare the water flow at the outlet and inlet of the cooling water circulation network, so as to facilitate the determination of whether there is a leak in the cooling water circulation network. An annular water tank and a cooling water drain port connected to the annular water tank are provided at the bottom of the coke quenching oven to facilitate the emergency discharge of leaking cooling water from the cooling water circulation network.

[0023] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0024] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0025] Figure 1 This is a schematic diagram of the structure of a coke quenching device suitable for small coke ovens according to the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of a coke quenching oven;

[0027] Figure 3 This is a schematic diagram of the cooling water pipe network.

[0028] Attached reference numerals: 1. Quenching oven; 101. Oven door; 102. Nitrogen inlet; 103. Air outlet; 104. Cooling water drain outlet; 2. Fan; 3. Pressure gauge; 4. Thermometer; 5. Gas shut-off valve; 6. Gas heat exchange cooling device; 7. Cooling water drain valve; 8. Cooling water circulation network; 801. Cooling water outlet; 802. Cooling water outlet main valve; 9. Cooling water outlet branch valve; 10. Flow meter; 11. Water-cooled unit; 12. Detailed Implementation

[0029] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0030] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0031] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0032] Please see Figures 1-3This is a coke quenching device suitable for small coke ovens, comprising a coke quenching oven 1, a water-cooled unit 12, and a gas heat exchange cooling device 6. The coke quenching oven 1 is square in shape and includes a furnace body and a furnace door 101. The furnace door 101 is one of the side walls of the coke quenching oven. The furnace body and the furnace door 101 are hinged and sealed together on one side to allow for the opening and closing of the furnace door 101 and the loading and unloading of coke. Cooling water circulation pipe networks 8 are provided on the side walls of the inner cavity of the furnace body, specifically, there are three sets of cooling water circulation pipe networks 8, each with its own cooling water outlet 801 and cooling water inlet 802. An annular water trough and a cooling water drain outlet 10 communicating with the annular water trough are provided at the bottom of the furnace body. 4. A cooling water drain valve 7 is provided at the cooling water drain port 104. Specifically, the annular water trough is distributed along the edge of the furnace body cavity to ensure that when cooling water leakage occurs in the cooling water circulation network, the leaked cooling water can be drained in an emergency. Specifically, the cooling water circulation network 8 is embedded in the side wall of the furnace body cavity. Cooling water flows inside the cooling water circulation network 8, and the outer wall of the cooling water circulation network 8 is in contact with the air inside the quenching furnace to reduce the internal temperature of the quenching furnace and achieve the purpose of accelerating dry quenching cooling.

[0033] The furnace body is equipped with a nitrogen inlet 102 and an air outlet 103 to introduce nitrogen and exhaust air. The nitrogen inlet 102 is connected to an external nitrogen channel, which has a valve to control whether nitrogen is supplied to the nitrogen inlet 102. A gas shut-off valve 5 is provided at the air outlet 103. When the furnace body is filled with nitrogen, the gas shut-off valve 5 is closed, thereby creating a nitrogen-filled space in the quenching furnace 1 to reduce coke burn-off during the cooling process. Fans 2 are provided at both the furnace door 101 and the top of the furnace body to accelerate the airflow inside the quenching furnace and achieve rapid coke cooling. A pressure gauge 3 for detecting the internal pressure of the furnace and a thermometer 4 for detecting the surface temperature of the coke placed inside the furnace are provided on the furnace door 101 to facilitate real-time monitoring of the temperature and pressure inside the furnace and to prevent high-pressure hazards. The gas heat exchange cooling device 6 is used to charge cooled nitrogen into the nitrogen inlet 102. It has a nitrogen channel and a cooling water channel to achieve indirect heat exchange between the nitrogen and the cooling water. The nitrogen in the external nitrogen channel flows into the nitrogen inlet 102 through the nitrogen channel in the gas heat exchange cooling device 6. The water-cooled unit 12 is used to supply and recover cooling water to the gas heat exchange cooling device 6 and the cooling water circulation network 8. It has an outlet and an inlet. A cooling water outlet main valve 9 is provided on its outlet. After the cooling water outlet main valve 9, it is divided into four cooling water branches, which are respectively connected to the cooling water inlets of the three sets of cooling water circulation networks and the inlets of the cooling water channels in the gas heat exchange cooling device 6. The cooling water outlets of the three sets of cooling water circulation networks and the outlets of the cooling water channels in the gas heat exchange cooling device 6 are all connected to the inlet of the water-cooled unit 12 to form a cooling water circulation loop.

[0034] Cooling water outlet valves 10 and flow meters 11 are provided on each of the four cooling water branches. Flow meters 11 are also provided at the cooling water outlets of the three sets of cooling water circulation pipe networks corresponding to the four cooling water branches and at the outlets of the cooling water channels in the gas heat exchange cooling device 6. By comparing the flow rates of the two flow meters on the same cooling water branch, it is possible to observe whether there is a cooling leak in the corresponding cooling water branch, so that corresponding treatment can be carried out.

[0035] Specifically, the individual devices in this embodiment, such as the gas heat exchange cooling device 6, the water-cooled unit 12, and various valves, pressure gauges, and temperature gauges, are all commercially available products.

[0036] A coke quenching method suitable for small coke ovens, employing the aforementioned coke quenching device, specifically includes the following steps:

[0037] S1: Before the small coke oven is discharged, the water cooling unit 12 is turned on in advance to produce cooling water. The cooling water outlet main valve 9 and the cooling water outlet branch valves 10 of the four cooling water branch lines behind it are turned on. In this implementation, it is preferred to turn on the cooling water 10 to 20 minutes in advance.

[0038] S2: After the small coke oven experiment produces coke, the coke is pushed into the coke quenching oven 1 and the oven door 101 is closed. Then, nitrogen is introduced into the coke quenching oven 1. After the nitrogen passes through the gas heat exchange cooling device 6 and exchanges heat with the cooling water, the nitrogen temperature is reduced and then enters the coke quenching oven 1.

[0039] S3: Open the gas shut-off valve 5 to ensure that the gas inside the coke quenching oven 1 is discharged, so that all the gas inside the coke quenching oven is discharged under the action of nitrogen.

[0040] S4: Open the furnace door 101 and the fan 2 on the top of the furnace body to accelerate the airflow inside the coke quenching furnace 1 and ensure that the coke inside the coke quenching furnace 1 is cooled quickly;

[0041] S5: After cooling for a certain period of time, close the gas shut-off valve 5 to ensure that the gas inside the coke quenching oven 1 is isolated from the outside air, thereby reducing the oxygen content in the coke quenching oven and reducing coke burn-off.

[0042] S6: After closing the gas shut-off valve 5, continue to introduce nitrogen for a certain period of time. In this embodiment, it is preferable to continue to introduce nitrogen for 1 to 2 minutes. Then stop introducing nitrogen into the coke quenching oven 1. At this time, the coke quenching oven 1 is in a sealed state. The pressure gauge 3 on the oven door 101 detects and displays the internal gas pressure of the coke quenching oven 1, and the temperature gauge 4 detects and displays the surface temperature of the coke inside the coke quenching oven 1.

[0043] S7: Observe the surface temperature of the coke inside the coke quenching oven 1 through the thermometer 4. When the surface temperature of the coke drops to a certain temperature, preferably 200℃ in this embodiment, close the cooling water outlet valve 9. The coke cooling is completed. Open the oven door 101 and take out the coke.

[0044] This method solves the problems of high coke burn-off and long quenching time during the coke quenching process in small coke ovens. At the same time, the dry quenching method ensures the stability of coke quality in small coke ovens, thereby ensuring the accuracy of experimental results.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A coke quenching device suitable for small coke ovens, characterized in that: The coke quenching oven includes a coke quenching oven, a water-cooled unit, and a gas heat exchange cooling device. The coke quenching oven includes a furnace body and a furnace door. A cooling water circulation network is provided on the side wall of the furnace body. A nitrogen inlet and an air outlet are provided on the furnace body. The nitrogen inlet is connected to an external nitrogen channel, and a gas shut-off valve is provided at the air outlet. The coke quenching oven is square in shape. The furnace door is one of the side walls of the coke quenching oven. The furnace body and the furnace door are hinged and sealed together on one side. The cooling water circulation network consists of three sets, which are respectively arranged on the three side walls of the furnace body. Fans are provided on the top of the furnace door and the furnace body to accelerate the airflow inside the coke quenching oven. A pressure gauge for detecting the pressure inside the furnace body and a thermometer for detecting the surface temperature of the coke placed inside the furnace body are provided on the furnace door. The gas heat exchange cooling device has an indirect heat exchange nitrogen channel and a cooling water channel. The external nitrogen channel is connected to the nitrogen inlet through the nitrogen channel of the gas heat exchange cooling device. The water-cooled unit has an outlet and an inlet. Its outlet is connected to the cooling water inlet of the cooling water circulation network and the inlet of the cooling water channel in the gas heat exchange cooling device, respectively. The cooling water outlet of the cooling water circulation network and the outlet of the cooling water channel in the gas heat exchange cooling device are both connected to the inlet of the water-cooled unit to form a cooling water circulation loop.

2. The coke quenching device for small coke ovens according to claim 1, characterized in that: The three sets of cooling water circulation pipe networks each have their own cooling water outlet and cooling water inlet. The outlet of the water-cooled unit is divided into four cooling water branches, which are respectively connected to the cooling water inlets of the three sets of cooling water circulation pipe networks and the inlet of the cooling water channel in the gas heat exchanger cooling device. The cooling water outlets of the three sets of cooling water circulation pipe networks and the outlet of the cooling water channel in the gas heat exchanger cooling device are all connected to the inlet of the water-cooled unit. Flow meters are installed on each of the four cooling water branches, and flow meters are also correspondingly installed at the cooling water outlets of the three sets of cooling water circulation pipe networks and the outlet of the cooling water channel in the gas heat exchanger cooling device.

3. The coke quenching device for small coke ovens according to claim 2, characterized in that: The water-cooled unit is equipped with a main cooling water outlet valve at its outlet, and cooling water outlet branch valves are provided on the four cooling water branch lines.

4. A coke quenching method suitable for small coke ovens, characterized in that, The specific steps of using the coke quenching device suitable for small coke ovens according to any one of claims 1 to 3 include: S1: Before the coke is discharged from the small coke oven, turn on the water-cooled unit 10 to 20 minutes in advance, and open the passage between the outlet of the water-cooled unit and the cooling water inlet in the cooling water circulation network and the inlet of the cooling water channel in the gas heat exchange cooling device. S2: After the small coke oven experiment produces coke, the coke is pushed into the quenching oven and the oven door is closed. Nitrogen is then introduced into the quenching oven through the external nitrogen channel. The nitrogen temperature is reduced after passing through the gas heat exchange cooling device and cooling water before entering the quenching oven. S3: Open the gas shut-off valve to release the internal gas of the coke quenching oven; S4: After all the internal gas of the coke quenching oven has been discharged under the action of nitrogen, close the gas shut-off valve to ensure that the internal gas of the coke quenching oven is isolated from the outside air. S5: After closing the gas shut-off valve, continue to supply nitrogen for 1-2 minutes, and then stop supplying nitrogen into the coke quenching oven; S6: When the surface temperature of the coke drops to 200°C, close the passage between the outlet of the water-cooled unit and the inlet of the cooling water in the cooling water circulation network and the inlet of the cooling water channel in the gas heat exchange cooling device, and the coke cooling is completed.

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