A device for controlling the introduction of moisture during dry quenching air.

Abstract

This invention provides a device for controlling the introduction of moisture during the dry quenching air intake, comprising a set of adsorption towers. The adsorption towers are hollow annular cylindrical structures. The hollow portion of the annular cylindrical structure is connected to the vent pipe of the dry quenching circulation system. Upper and lower air chambers are respectively provided at the upper and lower ends of the outer column of the annular cylindrical structure. The lower air chamber is connected to an air intake device, and the upper air chamber is connected to a gas box at the top of the annular flue of the dry quenching furnace. An air guide plate and a packing support grate plate are installed inside the outer column. The packing support grate plate is filled with a moisture adsorbent. This invention utilizes an air intake device to introduce air into the adsorption towers. Moisture in the air is adsorbed by the adsorption tower column, and the dry air enters the annular flue of the dry quenching furnace, where it comes into contact with combustible components and coke powder in the dry quenching circulation gas for oxygen supply and combustion. This significantly reduces the introduction of harmful elements such as moisture during the dry quenching air intake.

Description

Technical Field

[0001] This utility model relates to a device for controlling the introduction of moisture during the dry quenching air process. Background Technology

[0002] In the coking process, the final temperature of coal dry distillation into coke is 950–1050℃. The coke pushed out of the carbonization chamber is red-hot. The process of quenching and cooling it to below 300℃ is called coke quenching. There are generally two quenching methods: wet quenching and dry quenching. To recover the heat from the red-hot coke, improve the energy efficiency of the coking process, reduce environmental pollution during quenching, and decrease pollutant emissions, dry quenching is the primary method promoted in China.

[0003] Dry quenching involves loading red-hot coke into a sealed quenching furnace, where circulating, cooled inert gas gradually displaces the heat from the coke, quenching and cooling it. Heat exchange occurs in two locations within the dry quenching system: the furnace and the boiler. During quenching, the heat from the red-hot coke is transferred to a gaseous heat carrier in the furnace, which then transfers this heat to a pure water medium in the boiler to generate medium-pressure steam, thus cooling the gas. Driven by a circulating fan, the inert gas continuously circulates within the quenching system, cooling the coke temperature from 1000℃ to below 250℃.

[0004] During the dry quenching process, the residual volatiles in the red coke combine with the air introduced when the red coke is loaded, generating combustible gases such as H2, CH4, and CO in the pre-storage section of the dry quenching coke. To prevent the combustible gases from accumulating and exploding in the dry quenching furnace, a certain amount of air is usually introduced into the annular flue of the dry quenching coke furnace to burn the combustible gases accumulated in the circulating gas, thereby reducing the concentration of combustible gases in the circulating gas and preventing an explosion.

[0005] The air contains moisture. For example, when the relative humidity is 90%, there are 27 grams of water per cubic meter of air at 30°C. When the air is introduced into the dry quenching furnace, the moisture is carried in. After entering the circulating gas in the dry quenching furnace, the moisture reacts with the red coke in the high-temperature section, causing the coke to burn out. In addition, combustible gases such as H2 and CO are generated, which increases the amount of air that needs to be introduced. The amount of gas released by the dry quenching system to maintain balance also increases. Utility Model Content

[0006] Technical Problem: In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a device and method for controlling the introduction of moisture during the introduction of air in dry quenching, so as to control the water-gas reaction caused by the introduction of external moisture into dry quenching, which helps to reduce coke burn-off, reduce the amount of air to be introduced during dry quenching operation, and help to reduce the amount of flue gas discharged from the dry quenching system.

[0007] Technical solution: The present invention provides a device for controlling the introduction of moisture during the introduction of air in dry quenching coke, comprising a set of adsorption towers (1); the adsorption tower (1) is a hollow annular column structure, the hollow part (11) of the annular column structure is connected to the vent pipe (4) of the dry quenching coke circulation system, the upper and lower ends of the outer column (12) of the annular column structure are respectively provided with an upper air chamber (13) and a lower air chamber (14), the lower air chamber (14) is connected to the air introduction device (2), and the upper air chamber (13) is connected to the air box (5) at the top of the annular flue of the dry quenching furnace; an air guide plate and a packing support grate plate are provided inside the outer column (12), and the packing support grate plate is filled with moisture adsorbent.

[0008] As an improvement, the hollow part of the annular column is connected to the vent pipe (4) of the dry quenching circulation system via a flange.

[0009] As another improvement, the number of adsorption towers is n, of which m are in the adsorption state, k are in the desorption state, and the remaining j are in the cooling standby state, and j≥1.

[0010] As another improvement, the moisture adsorbent is one or a combination of several adsorbents with excellent water absorption performance; preferably, the moisture adsorbent is silica gel.

[0011] As another improvement, an air humidity analyzer (3) is also included, which is installed on the connecting pipe between the upper air chamber (13) and the air box (5) at the top of the annular flue of the dry quenching furnace.

[0012] As a further improvement, it also includes a first solenoid valve set on the connecting pipe between the lower air chamber (14) and the air inlet device (2), a second solenoid valve set on the connecting pipe between the hollow part (11) of the annular column structure and the vent pipe (4) of the dry quenching cycle system, and a control system; the first solenoid valve, the second solenoid valve, and the air humidity analyzer (3) are all connected to the control system.

[0013] As another improvement, a set of adsorption towers (1) are all located outside the pre-storage chamber of the dry quenching furnace; the set of adsorption towers (1) are arranged in a ring, which facilitates the configuration and automatic control of the air moisture adsorption and desorption unit.

[0014] This utility model also provides a device for reducing coke burn-off in a dry quenching coke device, including a dehumidifier connected to a gas box (5) at the top of the annular flue (6) of the dry quenching furnace.

[0015] As an improvement, the dehumidifier is the device described above.

[0016] Beneficial effects: This utility model device uses an air introduction device to introduce air into the adsorption tower. The moisture in the air is adsorbed by the adsorption tower column, and the dry air enters the annular flue of the dry quenching furnace, where it comes into contact with the combustible components and coke powder in the dry quenching circulating gas to provide oxygen for combustion. This can significantly reduce the introduction of harmful elements and moisture during the introduction of air into the dry quenching furnace. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, use the same reference numerals to denote the same or similar parts. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0018] Figure 1 A schematic diagram of the device for controlling the introduction of moisture during the air introduction of dry quenching coke; wherein, 1 is the adsorption tower, 2 is the air introduction device, 3 is the air humidity analyzer, 4 is the vent pipe of the dry quenching coke circulation system, 5 is the air box, 6 is the annular flue of the dry quenching furnace, 7 is the dry quenching furnace, and 8 is the boiler.

[0019] Figure 2 This is a schematic diagram of the adsorption tower structure; where 11 is the hollow part, 12 is the outer column, 13 is the upper gas chamber, and 14 is the lower gas chamber. Detailed Implementation

[0020] The present invention will be further described below.

[0021] The device for controlling the moisture introduced during the introduction of dry quenching air includes a set of adsorption towers 1; the number of adsorption towers is n, of which m are in the adsorption state, k are in the desorption state, and the remaining j are in the cooling standby state, and j≥1 at any time; the set of adsorption towers 1 is located outside the pre-storage chamber of the dry quenching furnace; the set of adsorption towers 1 is arranged in a ring.

[0022] The adsorption tower 1 is a hollow annular column structure. The hollow part 11 of the annular column structure is connected to the vent pipe 4 of the dry quenching circulation system via a flange. An upper air chamber 13 and a lower air chamber 14 are respectively provided at the upper and lower ends of the outer column 12 of the annular column structure. The lower air chamber 14 is connected to the air inlet device 2, and the upper air chamber 13 is connected to the air box 5 at the top of the annular flue 6 of the dry quenching furnace. An air humidity analyzer 3 is installed on the connecting pipe between the upper air chamber 13 and the air box 5 at the top of the annular flue 6 of the dry quenching furnace. An air guide plate and a packing support grate plate are provided inside the outer column 12. The packing support grate plate is filled with a moisture adsorbent; the moisture adsorbent is one or a combination of several adsorbents with excellent water absorption performance; preferably, the moisture adsorbent is silica gel. It also includes a first solenoid valve installed on the connecting pipe between the lower air chamber 14 and the air inlet device 2, a second solenoid valve installed on the connecting pipe between the hollow part 11 of the annular column structure and the vent pipe 4 of the dry quenching cycle system, and a control system; the first solenoid valve, the second solenoid valve, and the air humidity analyzer 3 are all connected to the control system.

[0023] The upper air chamber 13 and the lower air chamber 14 are used to collect or distribute air, respectively.

[0024] When the device is in operation, the adsorption and desorption states of the adsorption tower are automatically controlled by a programmable regulating valve according to the program of the control system.

[0025] On the one hand, the control system controls the opening and closing of the first solenoid valve on the connecting pipe between the lower gas chamber 14 and the air introduction device 2 to introduce gas. The air introduction device introduces air into the adsorption tower. The moisture in the air is adsorbed by the adsorption tower column. The dry air enters the annular flue of the dry quenching furnace and comes into contact with the combustible components and coke powder in the dry quenching circulating gas to supply oxygen for combustion. This can greatly reduce the introduction of harmful elements and moisture during the introduction of dry quenching air.

[0026] On the other hand, the control system controls the second solenoid valve on the connecting pipe between the hollow part 11 of the annular column structure and the vent pipe 4 of the dry quenching circulation system to allow the gas of the dry quenching circulation system to be discharged through the hollow part 11 of the annular column structure. At the same time as the gas is discharged, the outer column 12 of the annular column structure is heated to achieve the temperature rise and desorption of the adsorbent. Specifically, the adsorbent adopts a temperature-switching desorption method. The temperature required for temperature-switching desorption comes from the dry quenching vent gas introduced into the hollow part of the adsorption tower. The temperature of this part of the flue gas is usually 130~150℃, which meets the requirements of temperature-switching desorption of the adsorbent. Due to the introduction of air and the replenishment of nitrogen, the dry quenching vent gas is continuously generated, which meets the temperature rise requirements of the system for temperature-switching desorption.

[0027] The air humidity analyzer 3 is used to monitor the moisture content in the dry air collected by the adsorption tower online, serving as a parameter input for the operation of the dry quenching system and as a program control optimization for the adsorption and desorption states of the adsorption tower.

[0028] Using the above equipment, after drying and removing moisture before introducing air into the original dry quenching circulation system, the moisture content of the introduced air is reduced to below 4.8 g / Nm³ before entering the dry quenching circulation system. The following is a calculation of the annual reduction in coke burn-off after applying this utility model to a 140-ton / hour dry quenching device:

[0029] The average annual air intake is 10,000 cubic meters per hour, the average annual air temperature is 20℃, the humidity is 70%, the saturated water vapor content of air at 20℃ is 17.19 g / m³, and the saturated water vapor content of air at 0℃ is 4.8 g / m³. The dry quenching coke operates for 330 days a year and processes 1 million tons of coke.

[0030] Water-gas reaction: C + H₂O = H₂ + CO

[0031] Annual reduction in coke loss: (17.19 × 70% - 4.8) × 10000 × 24 × 330 × 12 ÷ 18 ÷ 1000000 = 382 (tons / year)

[0032] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A device for controlling the introduction of moisture during dry quenching air, characterized in that: It includes a set of adsorption towers (1); the adsorption tower (1) is a hollow annular column structure, the hollow part (11) of the annular column structure is connected to the vent pipe (4) of the dry quenching coke circulation system, the upper and lower ends of the outer column (12) of the annular column structure are respectively provided with an upper air chamber (13) and a lower air chamber (14), the lower air chamber (14) is connected to an air inlet device (2), and the upper air chamber (13) is connected to the air box (5) at the top of the annular flue (6) of the dry quenching furnace; an air guide plate and a packing support grate plate are provided inside the outer column (12), and the packing support grate plate is filled with moisture adsorbent.

2. The device for controlling the introduction of moisture during dry quenching air introduction according to claim 1, characterized in that: The hollow part of the annular column is connected to the vent pipe (4) of the dry quenching circulation system via a flange.

3. The device for controlling the introduction of moisture during dry quenching air introduction according to claim 1, characterized in that: The adsorption towers consist of n towers, of which m towers are in the adsorption state, k towers are in the desorption state, and the remaining j towers are in the cooling and standby state, where j≥1.

4. The device for controlling the introduction of moisture during dry quenching air introduction according to claim 1, characterized in that: A set of adsorption towers (1) are all located outside the pre-storage chamber of the dry quenching furnace; the set of adsorption towers (1) are arranged in a ring.

5. The device for controlling the introduction of moisture during dry quenching air introduction according to claim 1, characterized in that: The moisture absorbent is silica gel.

6. The device for controlling the introduction of moisture during dry quenching air introduction according to claim 1, characterized in that: It also includes an air humidity analyzer (3), which is installed on the connecting pipe of the air box (5) at the top of the upper air chamber (13) and the annular flue (6) of the dry quenching furnace.

7. The device for controlling the introduction of moisture during dry quenching air introduction according to claim 6, characterized in that: It also includes a first solenoid valve on the connecting pipe between the lower air chamber (14) and the air inlet device (2), a second solenoid valve on the connecting pipe between the hollow part (11) of the annular column structure and the vent pipe (4) of the dry quenching circulation system, and a control system; the first solenoid valve, the second solenoid valve, and the air humidity analyzer (3) are all connected to the control system.

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