Production system adopted by dry quenching circulating gas composition control process
By introducing air to burn off combustible components and coke powder after the circulating gas dust collector, the problems of carbon burning and exhaust gas emissions in the dry quenching circulating gas system are solved, and a low carbon burning and environmentally friendly production system is realized to ensure the safe and stable operation of the system.
Patent Information
- Application Number
- CN202421813977.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-30
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-07-30
AI Technical Summary
In the existing dry coke quenching circulating gas system, carbon burning and exhaust gas emission problems caused by the replenishment of combustible components in the circulating gas with air burning, especially combustible components such as H2, CO, CH4 react with coke powder at high temperature to generate H2O and CO2, resulting in waste of resources and environmental pollution.
After the circulating gas dust collector, air is introduced to burn the combustible components and residual coke powder in the circulating gas. Through the high-efficiency dust collector and waste heat boiler, the total combustible components are ensured to be <1%vol and the coke powder content is <1g/m3, avoid water coal gasification and carbon dissolution reaction, and reduce the carbon burn rate to <0.7%.
The carbon burn rate of the dry coking system has been reduced to <0.7%, which has reduced combustible gas emissions, achieved the goal of environmental protection and carbon emission reduction, and canceled the secondary dust collector to ensure the safe operation of the system.
Smart Images
Figure CN223047450U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of circulating gas for coke dry quenching in a coking plant, in particular to a production system adopted for a process of controlling the components of the circulating gas for coke dry quenching. Background Art
[0002] In the coking industry, the coke dry quenching device cools the hot coke through circulating gas in the dry quenching furnace. The high-temperature circulating gas heat-exchanged with the hot coke in the dry quenching furnace is passed through a primary dust collector to remove large-particle coke powder in the gas, then sent to a waste heat boiler for cooling, and then passed through a secondary dust collector to remove small-particle coke powder in the remaining gas. After that, it is pressurized by a circulating fan and then sent back into the dry quenching furnace to cool the coke. At present, in order to ensure the safety of the circulating gas, a large amount of air is introduced into the upper annular channel of the dry quenching furnace to burn the combustible components (such as H2, CO, CH4, etc.) continuously accumulated in the circulating gas, and a certain amount of gas is discharged to maintain the balance of the circulating system. Since air is introduced into the circulating gas in the upper annular channel of the dry quenching furnace, when burning the combustible part and part of the coke powder in the circulating gas, the temperature of the circulating gas rises to 900 - 1000 °C. The H2O and CO2 generated by the burned combustible components (such as H2, CO, CH4, etc.) and coke powder respectively react with coke powder under the temperature condition above 900 °C to regenerate H2 and CO through the water gasification and carbon solution reactions. The water gasification and carbon solution reactions are the main reasons for the carbon burn-off in coke dry quenching. At present, the carbon burn-off rate of the operating coke dry quenching devices is generally 1.5 - 2.0% w. At the same time, the discharged waste gas contains a considerable concentration of reducing gases (H2 2 - 4%, CO 4 - 10%, calorific value ~1000 kj / m 3 ) Direct emission causes waste of resources and pollution to the atmospheric environment. Summary of the Utility Model
[0003] Aiming at the problems of carbon burn-off and waste gas emission caused by burning the combustible components in the circulating gas by supplementing air in the circulating gas for coke dry quenching in the current coking industry, the purpose of the utility model is to propose a production system adopted for a process of controlling the components of the circulating gas for coke dry quenching, introducing air after dust removal to burn the combustible components and the remaining coke powder in the circulating gas, thereby avoiding the occurrence of water gasification and carbon solution reactions, and achieving a carbon burn-off <0.7% and reducing gases (H2, CO) <1% in the coke dry quenching system, and realizing the goals of environmental protection and carbon emission reduction.
[0004] To achieve the above purpose, the utility model is realized by adopting the following technical solutions:
[0005] A production system adopted by a process for controlling the composition of circulated gas in coke dry quenching, comprising a coke dry quenching furnace, a circulated gas deduster, a waste heat boiler, a circulated gas blower, an air inlet and an exhaust gas outlet. The lower inlet of the coke dry quenching furnace is connected to the outlet of the circulated gas blower through a circulated gas pipeline, the upper outlet of the coke dry quenching furnace is connected to the inlet of the circulated gas deduster through a circulated gas pipeline, the outlet of the circulated gas deduster is connected to the inlet of the waste heat boiler through a circulated gas pipeline, and the outlet of the waste heat boiler is connected to the inlet of the circulated gas blower through a circulated gas pipeline; the air inlet is connected to the outlet of the circulated gas deduster.
[0006] The air inlet is arranged between the circulated gas deduster and the inlet of the waste heat boiler.
[0007] An exhaust gas outlet is provided on the pipeline of the outlet of the circulated gas blower.
[0008] Compared with the existing technology, the beneficial effects of the present utility model are as follows:
[0009] By introducing air after the high-efficiency deduster to burn the combustible components and the remaining small amount of coke powder in the circulated gas, the total content of combustible components in the circulated gas is <1% vol, and the coke powder content is <1 g / m 3 , avoiding the CO2 carbon dissolution reaction, reducing the carbon burn-off rate to <0.7%, reducing carbon emissions, reducing the concentration of combustible gas in the discharged exhaust gas from ~10% vol to <1% vol, ensuring the safe operation of the system, significantly reducing the emission of combustible gas, and canceling the secondary deduster. Description of the Drawings
[0010] Figure 1 It is the process flow chart of the present utility model.
[0011] In the figure: 1 - coke dry quenching furnace, 2 - circulated gas deduster, 3 - waste heat boiler, 4 - circulated gas blower, 5 - air inlet, 6 - exhaust gas outlet, 7 - circulated gas. Detailed Embodiment
[0012] The following further illustrates the embodiments of the present utility model in combination with specific embodiments:
[0013] Such as Figure 1As shown in the figure, a process for controlling the composition of the circulating gas in coke dry quenching. The process path includes a coke dry quenching furnace 1, a circulating gas dust collector 2, a waste heat boiler 3, and a circulating fan 4. The circulating gas enters the coke dry quenching furnace 1 from the lower part and flows upward inside the furnace to exchange heat with the coke moving downward from the upper part of the coke dry quenching furnace 1. After the temperature rises, it is discharged from the upper annular channel. The high-temperature circulating gas discharged from the upper annular channel of the coke dry quenching furnace 1 enters the circulating gas dust collector 2. The circulating gas coming out of the circulating gas dust collector 2 enters the waste heat boiler 3. The cold circulating gas coming out of the waste heat boiler 3 is pressurized by the circulating fan 4 and then enters the lower part of the coke dry quenching furnace 1. A tail gas discharge port 6 is provided after the circulating fan 4 to discharge the excess gas. The circulating gas discharged from the upper annular channel of the coke dry quenching furnace 1 enters the circulating gas dust collector 2, where most of the coke powder is removed first. After the coke powder is separated from the high-temperature circulating gas, air is introduced and added to the high-temperature circulating gas. The combustible components H2, CO, and a small amount of CH4 in the high-temperature circulating gas are burned using the O2 in the introduced air to become H2O and CO2, and the remaining coke powder in the high-temperature circulating gas after dust removal is also burned together, further increasing the temperature of the circulating gas (raising by 100°C to 200°C).
[0014] The circulating gas dust collector 2 is a high-efficiency dust collector, and the dust removal efficiency requirement is > 80%, preferably 90 - 95%.
[0015] The air introduction point is between the separation of most of the removed coke powder from the high-temperature circulating gas in the circulating gas dust collector 2 and the inlet of the waste heat boiler 3.
[0016] The air introduction point is immediately incorporated after the separation of the high-temperature circulating gas from most of the removed coke powder in the circulating gas dust collector 2, so as to utilize the swirl of the circulating gas dust collector 2 to promote the mixing of the two gases.
[0017] The total sum of the combustible components in the burned high-temperature circulating gas < 1% vol, and the coke powder content < 1 g / m 3 .
[0018] A production system adopting the process for controlling the composition of the circulating gas in coke dry quenching includes a coke dry quenching furnace 1, a circulating gas dust collector 2, a waste heat boiler 3, a circulating fan 4, an air introduction port 5, and a tail gas discharge port 6. The lower inlet of the coke dry quenching furnace 1 is connected to the outlet of the circulating fan 4 through a circulating gas pipeline. The upper outlet of the coke dry quenching furnace 1 is connected to the inlet of the circulating gas dust collector 2 through a circulating gas pipeline. The outlet of the circulating gas dust collector 2 is connected to the inlet of the waste heat boiler 3 through a circulating gas pipeline. The outlet of the waste heat boiler 3 is connected to the inlet of the circulating fan 4 through a circulating gas pipeline. The air introduction port 5 is connected to the outlet of the circulating gas dust collector 2. A tail gas discharge port 6 is provided on the outlet pipeline of the circulating fan 4.
[0019] Example 1:
[0020] A process for controlling the composition of the circulating gas in coke dry quenching, and the production system adopted thereby includes: a coke dry quenching furnace 1, a circulating gas deduster 2, a waste heat boiler 3, a circulating fan 4, an air inlet 5, and an exhaust gas outlet 6.
[0021] Taking a 125t / h scale coke dry quenching plant as an example, the specific process is as follows:
[0022] 1) Low-temperature (130°C to 150°C) circulating gas (~162000m 3 / h) enters the cooling section from the lower part of the coke dry quenching furnace 1 and rises to exchange heat with the hot coke coming from above, and after the temperature rises (~830°C), it is discharged from the upper annular channel of the coke dry quenching furnace 1.
[0023] 2) The high-temperature circulating gas coming out of the annular channel of the coke dry quenching furnace 1 enters the circulating gas deduster 2 to remove most (90% - 95%) of the coke powder therein. The high-temperature circulating gas from which most of the coke powder has been separated in the circulating gas deduster 2 mixes with the air (~7000m 3 / h) introduced from the upper part of the circulating gas deduster in the central pipe to burn the combustible components in the high-temperature circulating gas and the remaining coke powder after dust removal, so that they are converted into H2O and CO2. After combustion, the temperature of the high-temperature circulating gas rises by ~110°C, that is, the temperature of the high-temperature circulating gas is ~940°C and it is discharged from the outlet of the circulating gas deduster 2.
[0024] 3) The high-temperature circulating gas discharged from the outlet of the circulating gas deduster 2 enters the waste heat boiler 3 to recover heat by cooling in the waste heat boiler 3 to generate steam. The temperature of the cooled circulating gas drops by 130 - 150°C and enters the circulating fan 4 for pressurization. The excess gas is discharged as waste gas, and the remaining gas enters the lower part of the coke dry quenching furnace 1 again.
[0025] The total combustible component content of the high-temperature circulating gas entering the waste heat boiler 3 after being burned by the introduced air after removing a large amount (90 - 95%) of coke powder in the circulating gas deduster 2 is <1% vol, and the coke powder content in the high-temperature circulating gas is <0.3g / m 3 to meet the normal working requirements of the subsequent waste heat boiler 3 and circulating fan 4.
[0026] The total combustible component content of the circulating gas coming out of the waste heat boiler 3 is <1% vol, which greatly reduces the content of combustible gas components in the discharged waste gas, saves resources and reduces air environmental pollution.
[0027] Since a large amount (90 - 95%) of coke powder is removed from the high-temperature circulating gas and then the heat-conducting air is introduced, a large amount of coke powder burning is avoided. The coke powder content in the high-temperature circulating gas temperature (~940°C) after burning is trace (<0.3g / m 3 ) thus avoiding the occurrence of water gasification and carbon solution reaction, greatly reducing the carbon burning loss, and reducing the overall carbon burning loss rate of coke dry quenching to <0.5%.
[0028] Although the specific implementation manners of the utility model have been described above in conjunction with the accompanying drawings, they are not intended to limit the protection scope of the present utility model. Based on the technical solutions of the present utility model, various modifications or deformations that can be made by those skilled in the art without creative efforts still fall within the protection scope of the present utility model.
Claims
1. A production system for a coke dry quenching cycle gas composition control process, characterized in that: It includes a dry quenching furnace, a circulating gas dust collector, a waste heat boiler, a circulating fan, an air inlet, and an exhaust gas outlet. The lower inlet of the dry quenching furnace is connected to the circulating fan outlet through a circulating gas pipeline, the upper outlet of the dry quenching furnace is connected to the circulating gas dust collector inlet through a circulating gas pipeline, the circulating gas dust collector outlet is connected to the waste heat boiler inlet through a circulating gas pipeline, and the waste heat boiler outlet is connected to the circulating fan inlet through a circulating gas pipeline; the air inlet is connected to the circulating gas dust collector outlet.
2. The production system of the dry quenching circulating gas composition control process according to claim 1 is characterized in that: The circulating fan outlet duct is provided with an exhaust gas discharge port.
3. The production system of the dry quenching circulating gas composition control process according to claim 1 is characterized in that: The air inlet is arranged after the circulating gas dust collector and before the inlet of the waste heat boiler.