Coke dry quenching device

Abstract

The embodiment of the present application provides a dry coke quenching device, comprising: a circulation pipeline and a dry quenching furnace, a primary dust collector, a waste heat boiler, a secondary dust collector and a heat exchanger arranged in sequence on the circulation pipeline, wherein: a first air inlet and an air introduction device are arranged between the outlet of the dry quenching furnace and the inlet of the waste heat boiler, and the air introduction device is configured to introduce outdoor air from the first air inlet into the circulation pipeline; a second air inlet is arranged on the dry quenching furnace. The embodiment of the present application can make the air introduction method better adapt to large-scale dry coke quenching devices.

Description

Technical Field

[0001] The present application relates to the technical field of coal coking, and in particular to a coke dry quenching device. Background Art

[0002] Coke dry quenching (CDQ), relative to wet quenching, refers to a quenching method that uses inert gas to cool down the hot coke.

[0003] In the production process of the CDQ unit, in order to ensure the safety of the gas circulation system of the CDQ unit, the concentration of the combustible components in the circulating gas must be effectively controlled. At present, there are generally two methods to control the concentration of the combustible components in the circulating gas within a safe range: one is the nitrogen dilution method, that is, continuously supplying a certain amount of nitrogen to the gas circulation system; the other is the air introduction method, that is, introducing air into the annular air duct of the CDQ furnace to burn the combustible components. However, the air introduction method is more economical and is conducive to increasing the boiler inlet temperature and the boiler steam production, so it is widely used.

[0004] The current air introduction method of the CDQ device is basically set at the annular air duct. The air is introduced into the CDQ annular air duct through a metal pipe by using the negative pressure of the CDQ annular air duct itself or the power provided by the fan. The air reacts with the combustible components CO and H2 in the circulating gas to reduce the concentration of the combustible components. However, there is also a combustion reaction of coke powder. Since the combustible components are closely related to the volatile matter of red coke, coke powder and coke quality, and with the development of large-scale coke ovens, the scale of its supporting CDQ devices has also increased accordingly. The existing air introduction volume has also increased significantly and the fluctuation has also increased, which has a certain impact on the production stability of the CDQ device. How to make the air introduction method better adapt to large-scale CDQ devices is a technical problem that needs to be solved urgently. Summary of the invention

[0005] The purpose of the embodiment of the present application is to provide a coke dry quenching device so that the air introduction method can better adapt to large-scale coke dry quenching devices. The specific technical solution is as follows:

[0006] According to one aspect of an embodiment of the present application, a coke dry quenching device is provided, comprising: a circulation pipeline and a dry quenching furnace, a primary dust collector, a waste heat boiler, a secondary dust collector and a heat exchanger sequentially arranged on the circulation pipeline, wherein:

[0007] A first air inlet and an air introduction device are provided between the outlet of the dry quenching furnace and the inlet of the waste heat boiler, and the air introduction device is configured to introduce outdoor air from the first air inlet into the circulation pipeline;

[0008] The dry quenching furnace is provided with a second air inlet.

[0009] According to the dry coke quenching device provided in the embodiment of the present application, a first air inlet and an air introduction device are arranged between the outlet of the dry quenching furnace and the inlet of the waste heat boiler, and a second air inlet is arranged on the dry quenching furnace. In this way, when it is necessary to introduce air into the dry coke quenching device, a part of the air can be introduced from the second air inlet, and a part of the air can be introduced at the first air inlet, so that the total amount of air introduced at the two air inlets can undergo a sufficient combustion reaction with the gas to be treated in the circulation pipeline, thereby effectively controlling the concentration of the gas to be treated in the dry coke quenching device, and further allowing the total air amount to meet the needs of a larger dry coke quenching device. Therefore, the embodiment of the present application can make the air introduction method better adapt to large-scale dry coke quenching devices.

[0010] In some embodiments, the dry coke quenching device further includes a first air pipeline disposed on the primary dust collector, and the first air inlet and the air introduction device are both disposed on the first air pipeline.

[0011] In some embodiments, the air introduction device is a variable frequency fan.

[0012] In some embodiments, the dry coke quenching device further includes a second air pipeline disposed in the dry quenching furnace, and a regulating valve disposed on the second air pipeline, and the second air inlet is disposed on the second air pipeline.

[0013] In some embodiments, the dry coke quenching device further includes a control system, wherein the control system is electrically connected to the regulating valve, and the control system is used to control the flow of the regulating valve so that the air flow on the second air pipeline is a preset value.

[0014] In some embodiments, the dry coke quenching device further includes a gas detection device for detecting the concentration of the gas to be treated in the circulation pipeline, and the gas detection device is electrically connected to the control system.

[0015] In some embodiments, the control system is electrically connected to the variable frequency fan, and the control system is further used to control the rotation speed of the variable frequency fan so that the air flow at the first air inlet changes with the concentration of the gas to be treated.

[0016] In some embodiments, the dry coke quenching device further includes a first flow meter disposed on the first air pipeline, and the first flow meter is electrically connected to the control system.

[0017] In some embodiments, the dry coke quenching device further includes a second flow meter disposed on the second air pipeline, and the second flow meter is electrically connected to the control system.

[0018] In some embodiments, the regulating valve is a pneumatic butterfly valve or an electric butterfly valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic structural diagram of a coke dry quenching device according to an embodiment of the present application.

[0021] Icons: 1-circulation pipeline; 2-dry quenching furnace; 21-second air inlet; 22-second air pipeline; 23-regulating valve; 24-annular air duct; 25-air distribution device; 3-primary dust collector; 31-first air inlet; 32-first air pipeline; 4-waste heat boiler; 5-secondary dust collector; 6-heat exchanger; 7-air introduction device; 8-circulation fan; 9-first flow meter; 10-second flow meter. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field based on the present application belong to the scope of protection of the present application.

[0023] like Figure 1 As shown, an embodiment of the present application provides a dry quenching device, comprising: a circulation pipeline 1 and a dry quenching furnace 2, a primary dust collector 3, a waste heat boiler 4, a secondary dust collector 5 and a heat exchanger 6 arranged in sequence on the circulation pipeline 1, wherein: a first air inlet 31 and an air introduction device 7 are arranged between the outlet of the dry quenching furnace 2 and the inlet of the waste heat boiler 4, and the air introduction device 7 is configured to introduce outdoor air from the first air inlet 31 into the circulation pipeline 1; a second air inlet 21 is arranged on the dry quenching furnace 2.

[0024] According to the dry coke quenching device provided in the embodiment of the present application, a first air inlet 31 and an air introduction device 7 are provided between the outlet of the dry quenching furnace 2 and the inlet of the waste heat boiler 4, and a second air inlet 21 is provided on the dry quenching furnace 2. In this way, when it is necessary to introduce air into the dry coke quenching device, a part of the air can be introduced from the second air inlet 21, and a part of the air can be introduced at the first air inlet 31, so that the total amount of air introduced at the two air inlets can undergo a sufficient combustion reaction with the gas to be treated in the circulation pipeline 1, thereby effectively controlling the concentration of the gas to be treated in the dry coke quenching device, and further enabling the total amount of air to meet the needs of a larger dry coke quenching device. Therefore, the embodiment of the present application enables the air introduction method to better adapt to a large-scale dry coke quenching device.

[0025] Furthermore, the dry coke quenching device further includes a circulation fan 8 arranged on the circulation pipeline 1 , and the circulation fan 8 is arranged between the secondary dust collector 5 and the heat exchanger 6 .

[0026] like Figure 1 As shown, in some embodiments of the present application, the dry coke quenching device further includes a first air pipeline 32 arranged on the primary dust collector 3, and the first air inlet 31 and the air introduction device 7 are both arranged on the first air pipeline 32. After the high-temperature gas generated in the dry quenching furnace 2 flows to the primary dust collector 3, it then flows to the waste heat boiler 4. Therefore, when the first air inlet 31 is arranged on the primary dust collector 3, the air introduced from the first air inlet 31 can enter the primary dust collector 3, and enter the waste heat boiler 4 through the pipeline between the primary dust collector 3 and the waste heat boiler 4. In this process, the air can be fully burned with the gas to be treated in the circulation pipeline 1, so that the introduced air can be fully utilized to reduce the concentration of the gas to be treated. Among them, the gas to be treated refers to the combustible components in the circulation pipeline 1, such as CO, H2, etc.

[0027] In other embodiments of the present application, the first air pipeline 32 is arranged on the pipeline between the outlet of the CDQ furnace 2 and the inlet of the primary dust collector 3 , or the first air pipeline 32 is arranged on the pipeline between the outlet of the primary dust collector 3 and the waste heat boiler 4 .

[0028] like Figure 1As shown, in some embodiments of the present application, the air introduction device 7 is a variable frequency fan. In this way, by changing the rotation speed of the variable frequency fan, the air flow introduced from the first air inlet 31 can be changed. Since inside the dry coke quenching device, in addition to the combustion reaction between the gas to be treated and the air, the coke powder entrained in the high-temperature gas will also produce a combustion reaction with the air, the introduced air may not match the required air, and there may be a situation where the gas to be treated is fully burned, or there may be a situation where the gas to be treated is not fully burned. Therefore, the concentration of the gas to be treated fluctuates within a certain range, and the variable frequency fan can make the dry coke quenching device better adapt to the changes in the concentration of the gas to be treated.

[0029] like Figure 1 As shown, in some embodiments of the present application, the dry coke quenching device further includes a second air pipeline 22 provided in the dry quenching furnace 2, and a regulating valve 23 provided on the second air pipeline 22, and the second air inlet 21 is provided on the second air pipeline 22. In this way, the air entering from the second air inlet 21 can enter the dry quenching furnace 2 and produce a combustion reaction with the gas to be treated in the dry quenching furnace 2. In addition, the air flow rate of the second air pipeline 22 can be adjusted by the regulating valve 23, so that the embodiment of the present application can adapt to a variety of dry coke quenching devices with different processing capabilities.

[0030] Furthermore, the dry quenching furnace 2 is provided with an annular air duct 24, and the second air pipeline 22 is provided on the annular air duct 24. An air distribution device 25 is provided inside the dry quenching furnace 2, so that the annular air duct 24 of the dry quenching furnace 2 itself has a certain negative pressure, and the negative pressure can draw the air outside the dry quenching device from the second air pipeline 22 to the annular air duct 24, and the air and the gas to be treated in the dry quenching furnace produce a combustion reaction. Therefore, the embodiment of the present application adopts two pressure operation modes of negative pressure suction and positive pressure blowing, to introduce air into the high temperature section of the dry quenching device, and fully burn with the gas to be treated in the circulation pipeline 1, so as to ensure the safety of the gas circulation system of the dry quenching device.

[0031] In addition, the second air pipeline 22 is connected to the CDQ furnace 2 via a distribution box, and the distribution box has a plurality of output pipes, each of which is connected to a different position of the annular air duct 24 of the CDQ furnace 2.

[0032] In some embodiments of the present application, the dry coke quenching device further includes a control system ( Figure 1 The control system is electrically connected to the regulating valve 23, and the control system is used to control the flow of the regulating valve 23 so that the air flow on the second air pipeline 22 is a preset value. In this way, the air flow into the annular air duct 24 of the dry quenching furnace 2 is a constant value. Therefore, during the process of air passing through the annular air duct 24, the pressure generated on the annular air duct 24 is relatively stable, and the temperature field of the annular air duct 24 is also relatively stable.

[0033] In addition, since in the embodiment of the present application, air is introduced into the dry coke quenching device from two air inlets respectively, it is possible to avoid a large amount of air with a variable flow rate entering the annular air duct 24 of the dry coke quenching furnace 2, which causes a large pressure fluctuation at the dry coke chute mouth, thereby affecting the uniformity of heat exchange of coke distributed in the radial direction in the cooling section of the dry coke quenching furnace 2, and also reduces the temperature fluctuation of the material around the air path in the annular air duct 24. In other words, the embodiment of the present application can ensure that the concentration of the gas to be treated is controlled within a safe range, reduce the damage of the annular air duct 24 due to the frequent changes in the pressure it bears, and increase the service life of the dry coke quenching furnace 2.

[0034] Furthermore, an operation panel is provided on the control system, and the opening and closing degree of the regulating valve 23 can be controlled through the operation panel, thereby controlling the air flow on the second air pipeline 22 .

[0035] In some embodiments of the present application, the dry coke quenching device further includes a gas detection device ( Figure 1 (not shown), the gas detection device is electrically connected to the control system. In this way, after the gas detection device detects the concentration of the gas to be treated, the concentration information is sent to the control system, and the operator can know the concentration of the gas to be treated, thereby adjusting the opening of the regulating valve 23 according to the concentration of the gas to be treated, so that the air flow on the second air pipeline 22 can match the concentration of the gas to be treated.

[0036] like Figure 1 As shown, in some embodiments of the present application, the control system is electrically connected to the variable frequency fan, and the control system is also used to control the rotation speed of the variable frequency fan so that the air flow at the first air inlet 31 changes with the change of the concentration of the gas to be treated. The gas detection device can send the concentration information to the control system, and the control system displays the gas concentration information to the operator. The operator determines the required air volume according to the concentration information and distributes the air volume, wherein a part of the required air is borne by the first air pipeline 32, and the other part of the required air is borne by the second air pipeline 22, so that the total amount of air entering the circulation pipeline 1 can match the required air. By controlling the variable frequency motor through the control system, the air flow at the first air inlet 31 can change with the change of the concentration of the gas to be treated, so that the air introduced into the circulation pipeline 1 can better adapt to the change of the concentration of the gas to be treated.

[0037] like Figure 1As shown, in some embodiments of the present application, the dry coke quenching device further includes a first flow meter 9 provided on the first air pipeline 32, and the first flow meter 9 is electrically connected to the control system. In this way, the first flow meter 9 can detect the air flow on the first air pipeline 32 in real time, and send the air flow to the control system, so as to adjust the speed of the variable frequency fan according to the air flow, so that the actual flow meets the preset requirements.

[0038] like Figure 1 As shown, in some embodiments of the present application, the dry coke quenching device further includes a second flow meter 10 disposed on the second air pipeline 22, and the second flow meter 10 is electrically connected to the control system. In this way, the second flow meter 10 can detect the air flow on the second air pipeline 22 in real time, and send the air flow to the control system, so as to adjust the opening of the regulating valve 23 according to the air flow, so that the actual flow meets the preset requirements.

[0039] Furthermore, the first flow meter 9 and the second flow meter 10 may both be mass flow meters or orifice flow meters.

[0040] like Figure 1 As shown, in some embodiments of the present application, the regulating valve 23 is a pneumatic butterfly valve or an electric butterfly valve. Since the start-up butterfly valve has the characteristics of simple structure, light weight and low cost, the dry coke quenching device of the embodiment of the present application also has the characteristics of simple structure, light weight and low cost.

[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0042] The above description is only a preferred embodiment of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A coke dry quenching device, characterized in that: include: A circulation pipeline and a dry quenching furnace, a primary dust collector, a waste heat boiler, a secondary dust collector and a heat exchanger sequentially arranged on the circulation pipeline, wherein: A first air inlet and an air introduction device are provided between the outlet of the dry quenching furnace and the inlet of the waste heat boiler, and the air introduction device is configured to introduce outdoor air from the first air inlet into the circulation pipeline; The first air inlet and the air introduction device are both arranged on a first air pipeline, and the first air pipeline is arranged on the primary dust collector; A second air inlet is provided on the dry quenching furnace, and external air is introduced into the dry quenching furnace through the second air inlet through the annular air duct; When air is introduced into the dry coke quenching device, part of the air is introduced from the second air inlet and part of the air is introduced from the first air inlet, so that the air introduced from the two air inlets can undergo a sufficient combustion reaction with the gas to be treated in the circulation pipeline.

2. The coke dry quenching device according to claim 1, characterized in that: The air introduction device is a variable frequency fan.

3. The coke dry quenching device according to claim 2, characterized in that: The dry coke quenching device further includes a second air pipeline arranged in the dry quenching furnace, and a regulating valve arranged on the second air pipeline, and the second air inlet is arranged on the second air pipeline.

4. The dry coke quenching device according to claim 3, characterized in that: The dry coke quenching device further includes a control system, which is electrically connected to the regulating valve and is used to control the flow of the regulating valve so that the air flow on the second air pipeline is a preset value.

5. The coke dry quenching device according to claim 4, characterized in that: The dry coke quenching device further comprises a gas detection device for detecting the concentration of the gas to be treated in the circulation pipeline, and the gas detection device is electrically connected to the control system.

6. The coke dry quenching device according to claim 5, characterized in that: The control system is electrically connected to the variable frequency fan, and the control system is also used to control the rotation speed of the variable frequency fan so that the air flow at the first air inlet changes with the change of the concentration of the gas to be treated.

7. The coke dry quenching device according to claim 4, characterized in that: The dry coke quenching device further includes a first flow meter disposed on the first air pipeline, and the first flow meter is electrically connected to the control system.

8. The coke dry quenching device according to claim 4, characterized in that: The dry coke quenching device further includes a second flow meter disposed on the second air pipeline, and the second flow meter is electrically connected to the control system.

9. The coke dry quenching device according to claim 3, characterized in that: The regulating valve is a pneumatic butterfly valve or an electric butterfly valve.

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