Continuous diffusing device for top gas of dry quenching furnace

Abstract

The utility model relates to a dry quenching furnace top gas continuous diffusing device which comprises a dry quenching furnace diffusing pipe, a spraying tank, a gas collecting tank, a jet device and a water inlet pipe, the dry quenching furnace diffusing pipe is connected with a gas inlet pipe in the middle of the spraying tank, and a ceramic packing layer, a spraying pipe and a horizontal demisting pore plate are sequentially arranged in the spraying tank above the gas inlet pipe from bottom to top. A water seal tank is arranged at the bottom of the gas collection tank, a bottom opening of the gas collection tank is inserted below the liquid level of the water seal tank, the bottom of the spraying tank is communicated with the water seal tank, the top of the spraying tank is connected with an air suction pipe, the other end of the air suction pipe extends to the lower portion in the gas collection tank, and the side face of the upper portion of the gas collection tank is connected with an ejector through an exhaust pipe. The water inlet pipe is respectively connected with a spraying pipe of the spraying tank and a water supplementing pipe of the water seal tank. According to the utility model, the requirement of diffusing combustible gas during normal production of the dry quenching system can be met, so that an adjusting means is added to the dry quenching system under a full-load working condition, and the safe and stable operation of the system is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of dry quenching coke, in particular to a continuous gas dispersing device at the top of a dry quenching furnace. Background Art

[0002] The CDQ furnace, a core component of the CDQ system, boasts a rigorous structural design consisting of a pre-storage section, a chute area, and a cooling section. The pre-storage section, also known as the pre-storage chamber, is located at the top of the CDQ furnace. Its primary function is to receive intermittently loaded high-temperature red coke and act as a buffer, ensuring continuous and stable coke discharge from the CDQ system. This design enables the CDQ system to maintain continuous heat exchange and a constant supply of heat energy to the boiler, thereby ensuring stable steam parameters.

[0003] The temperature of the red coke stored in the pre-storage chamber is strictly controlled between 950°C and 1050°C. Due to its residual volatile content, red coke continuously emits combustible gases within the pre-storage chamber. These gases are primarily composed of hydrogen (H2) and carbon monoxide (CO). As they rise, these gases accumulate in the cone-shaped space at the pre-storage chamber and, along with the circulating gas, enter the system for subsequent processing.

[0004] To address the potential gas accumulation that may occur during the initial CDQ operation and during sudden system failures, the CDQ pre-storage chamber is equipped with a release device. This device can quickly release accumulated gas when necessary to ensure safe system operation.

[0005] The residual volatile content of red coke is significantly affected by the coke oven production conditions. Specifically, if the coke is taken out of the oven too early, its maturity will be insufficient, which will lead to a high residual volatile content in the coke, and in turn, more combustible gases will be released in the CDQ furnace. However, the current venting device of the CDQ pre-storage chamber in China is limited by its design concept and structural form, and is mainly suitable for the initial start-up of the CDQ system and the need for venting in response to system failures. During the normal production stage of CDQ, if you try to perform a venting operation through this device, it may cause safety hazards. In particular, when the concentration of combustible gas in the CDQ system reaches the explosion limit, and the temperature in the pre-storage chamber is much higher than the ignition point of the combustible gas, once the pressure fluctuation of the circulation system causes air to be inhaled, an explosion accident may occur.

[0006] During conventional CDQ production, air is typically introduced into the CDQ furnace's annular duct to control the composition of combustible gases in the system. However, under conditions of high production load or poor coke maturity, the combustion of large amounts of combustible gases causes a sharp increase in system heat, potentially pushing boiler inlet temperatures beyond safe limits. This overheating exacerbates high-temperature creep in boiler tubes, posing a threat to boiler safety. Furthermore, the introduced air contains a certain amount of moisture, which, in high-temperature environments, participates in the water-gas reaction, further promoting the accumulation of combustible gas components and creating a vicious cycle.

[0007] Furthermore, it's worth noting that the design of the conventional CDQ furnace pre-chamber venting system presents potential safety risks. Because the dust hood at the top of the vent pipe is open, this area is susceptible to large amounts of air being drawn in. If the vented flue gas is mixed with open flames and drawn into the dust hood, the potential for explosion is significantly increased. Therefore, during the routine operation and maintenance of CDQ systems, close attention must be paid to these potential risks, and effective measures must be implemented to mitigate them.

[0008] In view of the above problems, it is particularly important to improve the emission system of the CDQ pre-storage chamber.

[0009] Chinese invention patent CN104893744 B discloses a "dry quenching coke oven top venting device," comprising a venting pipe, a water seal at the top outlet of the venting pipe, and a water seal cap at the top of the water seal. One side of the water seal cap is hinged to one end of a first crank arm, the middle of the first crank arm is connected to the venting pipe via a hinge seat, and the other end of the first crank arm is connected to the piston rod of a cylinder via a transmission member. The cylinder is hinged to the mounting seat and positioned along the extension of the venting pipe diameter. This device ensures uniform heating of the cylinder body and piston, uniform force around the mating surface between the cylinder body and piston, and effectively extends the service life of the cylinder.

[0010] The Chinese utility model patent with authorization publication number CN 217297731 U discloses a "dispersion device for a dry coke pre-storage chamber, wherein the discharge device for the dry coke pre-storage chamber comprises a first pipe section and a second pipe section. The bottom of the first pipe section is provided with a water collection portion in a sunken structure. The second pipe section is connected to the top wall of the first pipe section. The first and second pipe sections are connected by a socket-type connection. The lower end of the second pipe section is lower than the top wall of the first pipe section. The second pipe section is located opposite the water collection portion of the first pipe section, and the orthographic projection of the second pipe section on the horizontal plane is located within the orthographic projection of the water collection portion on the horizontal plane. The second pipe section generally adopts a water seal structure. The purpose is to solve the problem that welding points are easily corroded by water and sulfide mixtures, and to solve the problem of pipeline corrosion caused by the accumulation of sulfur-water mixture in the first pipe section.

[0011] The above two technical solutions for the CDQ pre-storage chamber venting device both aim to extend the service life of the equipment, but neither changes the applicable scope of the CDQ pre-storage chamber venting device, that is, it is only suitable for venting during CDQ start-up and system accidents.

[0012] A Chinese utility model patent, granted with publication number CN 220951647 U, discloses a "gas release device for a dry quenching coke oven top." The device comprises a first release pipe, a three-way pipe, a purge pipe, a second release pipe, a regulating valve, a water seal, and a water seal opening and closing mechanism. One end of the first release pipe is connected to the gas release outlet at the top of the pre-storage chamber, while the other end is connected via a three-way pipe to the bottom of the second release pipe and the purge pipe. The second release pipe is vertically arranged, with a regulating valve located above it and a water seal at its top. The water seal opens and closes under the control of the water seal opening and closing mechanism. The main limitations of this patent are: ① During the normal operation of the CDQ furnace, the pre-storage chamber pressure is a slight negative pressure of 0 to -100 Pa. Even if the regulating valve and water seal cover are opened, the gas cannot be discharged. Instead, the outside air may be sucked in. When the combustible gas content is high, there is a risk of explosion; ② The regulating valve operates in a high-temperature gas environment of 900 to 1050°C, which makes selection difficult, has a short service life, and cannot be repaired. Summary of the Invention

[0013] The technical problem to be solved by the utility model is to provide a continuous gas dispersing device at the top of a dry quenching furnace, which can meet the need of dispersing combustible gas during normal production of the dry quenching system, and increase the adjustment means of the dry quenching system under full load conditions to ensure safe and stable operation of the system.

[0014] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0015] A continuous gas dispersing device at the top of a dry quenching furnace comprises a dry quenching furnace dispersing pipe, a spray tank, a gas collecting tank, an ejector, and a water inlet pipe. The dry quenching furnace dispersing pipe is connected to the air inlet pipe in the middle of the spray tank. A ceramic filler layer, a spray pipe, and a horizontal demisting orifice plate are sequentially arranged in the spray tank above the air inlet pipe from bottom to top. A water seal groove is provided at the bottom of the gas collecting tank. The bottom opening of the gas collecting tank is inserted below the liquid level of the water seal groove. The bottom of the spray tank is connected to the water seal groove. The top of the spray tank is connected to an air intake pipe. The other end of the air intake pipe extends to the lower part of the gas collecting tank. The side surface of the upper part of the gas collecting tank is connected to the ejector through an air extraction pipe. The water inlet pipe is respectively connected to the spray pipe of the spray tank and the water supply pipe of the water seal groove.

[0016] The bottom of the spray tank is provided with a sewage pipe.

[0017] A low water level overflow pipe and a high water level overflow pipe are respectively provided on the sides of the water seal tank, and the bottom opening of the air suction pipe is between the low water level overflow pipe and the high water level overflow pipe.

[0018] A pressure transmitter is provided on the upper part of the gas collecting tank.

[0019] The air extraction pipe is provided with a temperature transmitter.

[0020] The exhaust pipe is provided with an inclined demisting orifice plate, and the bottom of the exhaust pipe on the water retaining side of the inclined demisting orifice plate is connected to the water seal groove through the exhaust pipe drain pipe.

[0021] Compared with the existing technology, the beneficial effects of the utility model are:

[0022] 1) It can release the combustible gas volatilized from red coke, reduce the combustible gas content in the dry quenching system, and ensure the safe production of the system;

[0023] 2) Avoid the situation in which a large amount of air is introduced into the conventional CDQ system to control the composition of combustible gas, which may cause the system to operate at an over-temperature;

[0024] 3) By safely dispersing the combustible gases in the CDQ system from the top of the CDQ furnace, the problem of high combustible gas content and inability to introduce more air for combustion under full-load CDQ production conditions, which in turn affects the safe operation of the boiler, is solved;

[0025] 4) Reduce the increase in combustible gas content caused by the water-gas reaction caused by the introduction of air to burn the combustible gas;

[0026] 5) It can prevent open flames from being carried into the released gas under any working conditions and brought into the subsequent dust removal system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural diagram of the utility model.

[0028] In the picture:

[0029] CDQ furnace vent pipe 1, spray tank 2, gas collecting tank 3, ejector 4, water inlet pipe 5, air inlet pipe 6, ceramic filler layer 7, spray pipe 8, horizontal demisting orifice plate 9, water seal groove 10, suction pipe 11, exhaust pipe 12, sewage pipe 13, low water level overflow pipe 14, high water level overflow pipe 15, pressure transmitter 16, temperature transmitter 17, inclined demisting orifice plate 18, exhaust pipe drain pipe 19, water supply pipe 20. DETAILED DESCRIPTION

[0030] In the description of this utility model, it should be understood that the terms "first," "second," etc. are used for descriptive purposes only and should not be construed to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first," "second," etc. may explicitly or implicitly include one or more of such features. In the description of this utility model, unless otherwise specified, "plurality" means more than two.

[0031] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0032] First, the venting device was redesigned to ensure it could meet the venting requirements during start-up and accidents, while also operating safely and effectively during normal production. The solution was to adopt a closed venting system, using sealing devices to reduce the possibility of outside air entering the pre-storage chamber. Ejectors were also used to maintain venting pressure, preventing air from being drawn into the CDQ furnace. Furthermore, a venting condition monitoring device could be added to monitor the venting pipe temperature and pressure in real time to ensure system safety.

[0033] like Figure 1 A continuous gas dispersing device at the top of a dry quenching furnace comprises a dry quenching furnace dispersing pipe 1, a spray tank 2, a gas collecting tank 3, an ejector 4, and a water inlet pipe 5. The dry quenching furnace dispersing pipe 1 is connected to the air inlet pipe 6 in the middle of the spray tank 2. The spray tank 2 above the air inlet pipe 6 is provided with a ceramic filler layer 7, a spray pipe 8 and a horizontal demisting orifice plate 9 from bottom to top. A water seal groove 10 is provided at the bottom of the gas collecting tank 3. The bottom of the gas collecting tank 3 is open and inserted below the liquid level of the water seal groove 10. The bottom of the spray tank 2 is connected to the water seal groove 10. The top of the spray tank 2 is connected to the air intake pipe 11. The other end of the air intake pipe 11 extends to the lower part of the gas collecting tank 3. The side surface of the upper part of the gas collecting tank 3 is connected to the ejector 4 through an exhaust pipe 12. The water inlet pipe 5 is respectively connected to the spray pipe 8 of the spray tank 2 and the water supply pipe 20 of the water seal groove 10.

[0034] A sewage pipe 13 is provided at the bottom of the spray tank 2 .

[0035] A low water level overflow pipe 14 and a high water level overflow pipe 15 are respectively provided on the side of the water seal tank 10 , and the bottom of the suction pipe 11 is between the low water level overflow pipe 14 and the high water level overflow pipe 15 .

[0036] A pressure transmitter 16 is provided on the upper portion of the gas collecting tank 3 .

[0037] The exhaust pipe 12 is provided with a temperature transmitter 17 .

[0038] The exhaust pipe 12 is provided with an inclined demisting orifice plate 18 , and the bottom of the exhaust pipe 12 on the water retaining side of the inclined demisting orifice plate 18 is connected to the water seal tank 10 through an exhaust pipe drain pipe 19 .

[0039] The power medium end of the ejector 4 is fed with compressed air or nitrogen, or is connected to a Roots blower.

[0040] When the emission device is in operation, high-temperature flue gas enters the center of spray tank 2 under the negative pressure generated by the ejector. It passes upward through ceramic packing, spray water mist, and demister plates, cooling it to below 90°C. It then enters gas collecting tank 3 through suction pipe 11 at the top of spray tank 2. Suction pipe 11 extends downward to the highest water level of water seal tank 10, at a point between -30 and -40 cm. At this point, the water seal level remains low, allowing flue gas to freely enter the gas collecting tank and be extracted and discharged by the ejector. The control system monitors the operating conditions of gas collecting tank 3 via temperature transmitter 17 and pressure transmitter 16, and adjusts the flow rate of the motive medium in ejector 4 to ensure that the pressure in gas collecting tank 3 is always lower than the pre-storage chamber pressure of the CDQ furnace, ensuring that no outside air is drawn into the CDQ furnace during operation.

[0041] When the venting device is in standby mode: the overflow valve of the low water level overflow pipe 14 is closed, the water seal water level rises to the high water level, overflows from the high water level overflow pipe 15, the air intake pipe 11 is sealed by water, and the motive medium of the ejector 4 is shut off at the same time, and the negative pressure in the air collecting tank 3 returns to zero. At this time, the bottom of the air intake pipe 11 is 30 cm lower than the high water level of the water seal tank 10, and the negative pressure in the CDQ furnace pre-storage chamber (minimum -400 Pa) cannot destroy the water seal, and the CDQ furnace is in a sealed state.

[0042] To make the purpose, technical solution, and technical effects of the present invention more clearly understood, the technical solutions in the embodiments of the present invention are now described clearly and completely. However, the embodiments described below are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art without inventive effort in conjunction with the embodiments of the present invention are also within the scope of protection of the present invention.

[0043] Example

[0044] A continuous gas dispersing device for the top of a dry quenching furnace comprises a dry quenching furnace dispersing pipe 1, a spray tank 2, a gas collecting tank 3, an ejector 4, and a water inlet pipe 5. The dry quenching furnace dispersing pipe 1 is connected to an air inlet pipe 6 in the middle of the spray tank 2. A ceramic packing layer 7, a spray pipe 8, and a horizontal demisting orifice plate 9 are sequentially arranged in the spray tank 2 above the air inlet pipe 6 from bottom to top. A sewage pipe 13 is provided at the bottom of the spray tank 2.

[0045] The water inlet pipe 5 is connected to the spray pipe 8 of the spray tank 2 and the water supply pipe 20 of the water seal tank 10 respectively.

[0046] A water seal groove 10 is provided at the bottom of the gas collecting tank 3. The gas collecting tank 3 is connected to the water seal groove 10 via a bracket. The bottom of the gas collecting tank 3 is open and inserted below the liquid level in the water seal groove 10. The bottom of the spray tank 2 is connected to the water seal groove 10. The top of the spray tank 2 is connected to an air intake pipe 11. The other end of the air intake pipe 11 extends to the lower part of the gas collecting tank 3. The air intake pipe 11 is fixed by a bracket. A low water level overflow pipe 14 and a high water level overflow pipe 15 are respectively provided on the side of the water seal groove 10. The bottom of the air intake pipe 11 is between the low water level overflow pipe 14 and the high water level overflow pipe 15. A pressure transmitter 16 is provided on the top of the gas collecting tank 3.

[0047] The upper side of the gas collecting tank 3 is connected to the ejector 4 via an exhaust pipe 12, which is equipped with a temperature transmitter 17. An inclined demister plate 18 is installed within the exhaust pipe 12. The bottom of the exhaust pipe 12 on the water-blocking side of the inclined demister plate 18 is connected to the water seal tank 10 via an exhaust pipe drain pipe 19. Compressed air is introduced into the motive medium end of the ejector 4.

[0048] During normal CDQ production, if the combustible components in the CDQ system fall below a set value, the low-water overflow pipe 14 is closed and the high-water overflow pipe 15 is kept open, so that the water level in the gas collecting tank 3 is higher than the bottom of the suction pipe 11. At this point, the spray pipe 8 is closed and the water supply pipe 20 is open, ensuring that the water level in the gas collecting tank 3 remains high. This means that the venting device is in standby mode.

[0049] If the combustible gas content in the CDQ system is higher than the set value, compressed air is introduced into the power medium end of the ejector to establish a negative pressure in the gas collecting tank 3; the low water level overflow pipe 14 is opened to reduce the water level in the gas collecting tank 3 to the low water level, and the suction pipe 11 is connected to the gas collecting tank 3; the spray pipe 8 is opened simultaneously to start spraying water (the water supply pipe can be closed at this time to save water), and the high-temperature flue gas extracted from the CDQ furnace is released after cooling to reduce the combustible gas content in the CDQ system.

[0050] The flue gas from the CDQ furnace is cooled by water spraying, eliminating any open flame coke particles. After being mixed with a large amount of air through the ejector, the flammable components are below the explosion limit, preventing explosion. The flue gas from the ejector outlet can be treated in a desulfurization and dust removal station in the CDQ area to avoid environmental pollution.

[0051] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and basic spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A continuous gas dispersing device for the top of a dry quenching furnace, characterized in that: It includes a dry quenching furnace discharge pipe, a spray tank, an air collecting tank, an ejector, and a water inlet pipe. The dry quenching furnace discharge pipe is connected to the air inlet pipe in the middle of the spray tank. The spray tank above the air inlet pipe is provided with a ceramic filler layer, a spray pipe and a horizontal demisting orifice plate from bottom to top. A water seal groove is provided at the bottom of the air collecting tank. The bottom opening of the air collecting tank is inserted below the liquid level of the water seal groove. The bottom of the spray tank is connected to the water seal groove. The top of the spray tank is connected to the intake pipe. The other end of the intake pipe extends to the lower part of the air collecting tank. The side of the upper part of the air collecting tank is connected to the ejector through an exhaust pipe. The water inlet pipe is respectively connected to the spray pipe of the spray tank and the water supply pipe of the water seal groove.

2. The continuous gas dispersing device for the top of the CDQ furnace according to claim 1 is characterized in that: The bottom of the spray tank is provided with a sewage pipe.

3. The continuous gas dispersing device for the top of the CDQ furnace according to claim 1 is characterized in that: A low water level overflow pipe and a high water level overflow pipe are respectively provided on the sides of the water seal tank, and the bottom opening of the air suction pipe is between the low water level overflow pipe and the high water level overflow pipe.

4. The continuous gas dispersing device for the top of the CDQ furnace according to claim 1 is characterized in that: A pressure transmitter is provided on the upper part of the gas collecting tank.

5. The continuous gas dispersing device for the top of the CDQ furnace according to claim 1 is characterized in that: The air extraction pipe is provided with a temperature transmitter.

6. The continuous gas dispersing device for the top of the CDQ furnace according to claim 1 is characterized in that: The exhaust pipe is provided with an inclined demisting orifice plate, and the bottom of the exhaust pipe on the water retaining side of the inclined demisting orifice plate is connected to the water seal groove through the exhaust pipe drain pipe.

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