A method and system for online self-cleaning pressure regulation of a single-hole carbonization chamber riser pipe system

Abstract

This invention relates to the field of metallurgical coke oven technology, and in particular discloses an online self-cleaning method and system for a single-hole carbonization chamber riser pipe system. The method includes online coke removal from the bridge pipe front tee, bridge pipe horizontal pipe, and bridge pipe rear tee. A valve plate is installed inside the bridge pipe horizontal pipe or the bridge pipe rear tee. An external motor drives a threaded chain shaft to rotate and move axially. A guide frame is installed at one end of the threaded chain shaft, and a scraper is installed at the rear end of the guide frame. By rotating the inner diameter of the pipe and matching the blade, the scraper moves axially to scrape away coke and tar deposits at the valve plate, bridge pipe front tee, bridge pipe horizontal pipe, and bridge pipe rear tee. Compared with traditional technologies, this technical solution extends the service life of the valve plate while ensuring pressure regulation accuracy, solving the long-standing pressure regulation problem within the carbonization chamber.

Description

Technical Field

[0001] This invention relates to the field of metallurgical coke oven technology, and in particular to an online self-cleaning method and system for a single-hole carbonization chamber riser pipe system. Background Technology

[0002] The coke oven is the core equipment in the coking process. It consists of dozens of parallel carbonization chambers. During the high-temperature dry distillation process, coking coal decomposes into coke and raw coal gas. Its pressure dynamics directly affect the coal gas recovery efficiency, coke quality and pollutant emissions.

[0003] A single-chamber pressure control system for a coke oven is a pressure control system that regulates the pressure of a single carbonization chamber. Its purpose is to reduce or eliminate pollutant emissions during coal feeding and coking processes, while also improving coke quality, reducing furnace wall leakage, and increasing the yield and quality of tar and benzene in the raw coal gas. Specifically, the variation in gas generation over a complete coking cycle is significant and related to factors such as the moisture content and composition of the coal fed into the furnace, the flue temperature, and the coking time. By using single-hole pressure regulation technology, the pressure at the bridge tube measuring point, which characterizes the gas pressure within the carbonization chamber, is controlled. Combined with the gas generation patterns during the coking process, and utilizing the optimal control mode, the actual pressure within the carbonization chamber can be kept stable.

[0004] Currently, domestic single-adjustment systems are basically of two types. One type adds an adjusting valve between the top of the straight section of the riser pipe and the bridge pipe, and at the same time adds a hydraulic system for adjustment and control, adjusting the flow area of ​​raw coal gas. The other type adds a water seal isolation valve at the upper end of the gas collecting pipe socket at the lower end of the bridge pipe to adjust the gas-liquid flow area. In both types, the valve plate is driven by the hydraulic system to rotate, thereby changing the flow area and controlling the pressure in the carbonization chamber.

[0005] The hydraulic system requires the use of electrical components such as pressure measuring instruments, wires, and pressure measuring pipes. However, the furnace doors on both sides and the top of the coke oven are flame areas. (1) Any pressure measuring instrument will malfunction in the flame area, posing a safety hazard. (2) Coking and tar are prone to occur in the carbonization chamber, which will block the pressure measuring pipes used to detect pressure at the pressure measuring points, causing incorrect pressure signals and misjudgments in control. (3) Coking and tar will occur on the surface of the regulating valve and the water seal isolation valve, causing the valve plate and the hydraulic system controlling the opening and closing of the valve plate to jam, resulting in the failure of the carbonization chamber monotonic system. (4) The electrical components and wiring of the control hydraulic system are baked by the flame. This makes the pressure regulating system easily damaged and malfunctioning, resulting in a short service life.

[0006] To extend the service life of the pressure regulating system (including valve plate, hydraulic system and various electrical components), placing the valve plate (regulating valve and water seal isolation valve) after the ammonia injection point can delay coking and tar formation on the valve plate surface and hydraulic system to some extent. However, this position is in the gas-liquid two-phase zone. Compared to before the ammonia injection point, the gas volume at this position is reduced by more than two thousand times, making the pressure regulation here extremely sensitive. The regulating valve and water seal isolation valve have difficulty accurately controlling the carbonization chamber pressure, which reduces the pressure regulation accuracy of the valve plate.

[0007] Therefore, it is necessary to propose an online self-cleaning pressure regulating method and system for a single-hole carbonization chamber riser pipe system, so as to extend the service life of the pressure regulating system in the carbonization chamber while ensuring the accuracy of pressure regulation. Summary of the Invention

[0008] The purpose of this invention is to solve the problem that the service life and pressure regulation accuracy of existing pressure regulating systems cannot be simultaneously achieved. A method and system for online self-cleaning pressure regulation of a single-hole carbonization chamber riser pipe system is provided.

[0009] The technical solution of this invention is: A method for online self-cleaning and pressure regulation of a single-hole carbonization chamber riser pipe system includes an online coke cleaning device for the horizontal pipe of the bridge pipe installed in the tee after the bridge pipe, and a mechanical counterweight one-way valve plate self-pressure regulating device installed in the horizontal pipe of the bridge pipe. The mechanical counterweight one-way valve plate self-pressure regulating device regulates the pressure of the coke oven carbonization chamber by controlling the opening degree of the valve plate to control the gas flow area of ​​the raw coal gas. The mechanical counterweight type one-way valve plate pressure regulating device includes a bridge tube horizontal pipe, a valve plate suspension device, a valve plate, a valve plate shaft, a bearing, a valve seat, and an external drive device for the bridge tube. The outer diameter of the valve plate is equal to the inner diameter of the bridge tube with a clearance fit. The valve plate and the valve seat have a sealing surface, and the mating surface is inclined at a certain angle to the axis of the horizontal pipe. The pressure formed by the axial component of the valve plate achieves a constant pressure control of 5+5Pa at the bottom of the coke oven carbonization chamber. In practical applications, this pressure control can be increased as needed. The valve plate is suspended on the wall of the bridge tube, and the inner diameter of the valve plate is the inner diameter of the bridge tube. The wall thickness of the bridge tube is the width of the sealing surface. The outer wall of the bridge tube horizontal pipe is provided with a heat insulation layer, which ensures that the temperature of the raw coal gas inside the bridge tube is greater than 450℃. The online coking and self-cleaning pressure regulation method for the bridge pipe tee involves installing an eccentric mechanical counterweight on the vertical pipe of the bridge pipe tee to automatically control the valve opening. This adjusts the flow area of ​​the gas-liquid mixture between the raw coal gas liquid phase and the coke oven gas gas phase, achieving a constant pressure control of 5+5Pa at the bottom of the coke oven carbonization chamber. In practical applications, this pressure control can be increased as needed. The online coking and self-cleaning method also involves installing an online coking device on the top of the vertical pipe of the bridge pipe tee.

[0010] Furthermore, the rear tee is equipped with an online descaling device for the horizontal tube of the bridge tube, including a scraper end, a chain rod shaft, a chain rod shaft seat and its drive motor, the bridge tube rear tee, a scraper storage box, and a chain rod shaft receiver. The scraper is divided into a circumferential ring scraper and a multi-blade scraper. When the valve plate is closed, the multi-blade scraper is used to clean the outer surface of the valve plate online by rotating. When the valve plate is fully open, the circumferential ring scraper is used to clean the inner surface of the valve plate online. The scraper storage box is characterized in that the inner diameter of the scraper storage box is the same as the inner diameter of the vertical tube of the bridge tube rear tee. The inner diameter of the scraper storage box is the same as the inner diameter of the vertical tube of the bridge tube rear tee, which enables the front end of the scraper to clean itself during the vertical online self-cleaning process. When the scraper is stored in the storage box, the rear end of the scraper can be cleaned itself. The cleaning principle of the vertical scraper is the same as that of the horizontal scraper.

[0011] The scraper end is installed at the front end of the chain-driven shaft. The rotation of the chain-driven shaft drives the hanger to rotate. The outer diameter of the scraper is clearance-fitted with the horizontal tube of the bridge tube. The chain-driven shaft seat passes through the wall of the tee section of the bridge tube and, through a pneumatic motor installed on the outer wall of the tee, drives the chain-driven shaft to rotate, scraping away the coke or tar deposits adhering to the inner wall of the horizontal tube of the bridge tube. The chain-driven shaft is composed of multiple short chain-driven shaft segments hinged together to form a long shaft. When the chain retracts, the scraper is located in the storage cavity on the inner wall of the tee section of the bridge tube, and its inner diameter profile is the inner diameter of the tee section. Simultaneously, the multiple short chain segments of the chain-driven shaft are rolled up and stored in the chain-driven shaft receiver to save space at the external bridge tube location. The segmented hinge connection of the shaft allows for unidirectional bending. When the chain shaft extends, the segmented hinge connection straightens in one direction, and the locating pin is inserted into the locating hole to fix the chain shaft into a rigid shaft that transmits rotational torque. When the chain shaft retracts, the locating pin is pulled out to fix the segmented locating hole of the chain shaft, the hinge connection bends in one direction, and the chain shaft curls up and is stored in the chain shaft holder. Considering the limited length of the bridge tube, a simple lead screw shaft can also be used. Using a lead screw shaft can eliminate the need for segmented chain shafts, locating pins, and their mechanisms. For threaded chain shafts, in practical applications, when there is sufficient space for extension, a rigid shaft can be used. This can reduce the complexity of the chain shaft structure and lower costs and management expenses.

[0012] Furthermore, when cleaning the bridge pipe front tee, bridge pipe horizontal pipe and bridge pipe rear tee, the external motor driving threaded chain shaft rotation and axial movement device is installed on the main wall of the bridge pipe rear tee, and the valve plate adopts a mechanical counterweight pressure regulating valve and is installed in the bridge pipe horizontal pipe.

[0013] When cleaning the slag from the rear tee of the bridge pipe, the external motor-driven threaded chain shaft rotation and axial movement device is installed on the top cover of the rear tee of the bridge pipe. The valve plate adopts a multi-disc balance valve and is installed at the bottom of the rear tee of the bridge pipe.

[0014] Furthermore, the valve plate adopts a multi-lobed eccentric balance valve plate. The valve plate is normally closed. When coal tar and coke oven gas pass through, they act on the multi-lobed eccentric balance valve plate. The eccentric part with a smaller area is adjusted by the pressure of coal tar and coke oven gas, thereby achieving constant pressure control of 5+5Pa at the bottom of the coke oven carbonization chamber. The valve plate is installed at the bottom of the bridge pipe tee. The online self-cleaning is characterized by: a motor-driven threaded chain shaft rotation and axial movement device installed on the outer wall of the top cover of the bridge pipe tee.

[0015] Furthermore, a centrally distributed high- and low-pressure ammonia spraying device is installed on the top cover of the bridge pipe tee. The ammonia spray is sparse on the raw coal gas inlet side and dense on the other raw coal gas inlet sides, which causes coking that does not stick to the horizontal pipe wall to form at the C-shaped opening formed by the bridge pipe tee and the bridge pipe horizontal pipe connection.

[0016] A self-cleaning pressure regulating system for a single-hole carbonization chamber riser pipe system includes a bridge pipe front tee, a bridge pipe horizontal pipe, and a bridge pipe rear tee. It also includes an external motor-driven threaded chain shaft rotation and axial movement device and a valve plate placed inside the bridge pipe horizontal pipe or the bridge pipe rear tee. The side pipes of the bridge pipe front tee, the bridge pipe horizontal pipe, and the bridge pipe rear tee are coaxially connected. The external motor-driven threaded chain shaft rotation and axial movement device includes a threaded chain shaft, a guide frame and scraper installed at one end of the threaded chain shaft, a chain machine storage box, a drive motor, a chain sealing cavity, a scraper, and a storage cavity. When the scraper is retracted into the storage cavity, the storage cavity and the top of the scraper complete a scissor-like process to remove the graphite or condensed tar that has accumulated on it. After the scraper enters the storage cavity, the storage cavity is closed by a half-concealed inner and outer extension. During the closing process, the graphite or condensed tar under the scraper is removed, thus cleaning the front of the scraper.

[0017] Furthermore, the valve plate is a mechanical counterweight pressure regulating valve, which includes a counterweight valve seat, a counterweight valve plate, a horizontal pipe with a large opening saddle-shaped flange, and a high-pressure ammonia-driven hydraulic cylinder. The scraper is a circumferential ring scraper and a multi-blade scraper. The valve plate is located on the horizontal pipe of the bridge pipe near the front tee end of the bridge pipe. The chain rod machine storage box, drive motor, chain rod sealing cavity and storage cavity are installed on the main pipe side wall of the bridge tube rear tee, and the threaded chain rod shaft, guide frame and scraper are installed inside the bridge tube horizontal pipe; The scraper is inserted tightly into the receiving cavity, and its outer surface forms the same curved surface as the side tube and the main tube wall; the threaded chain shaft is provided with a packing seal and / or an external gas seal cavity when it passes through the chain shaft cover or the tube wall.

[0018] Furthermore, the bridge pipe at the top rear of the valve plate is provided with flange sealing openings in the upper and lower parts, and telescopic low-pressure ammonia water axial spray nozzles are provided on the openings.

[0019] Furthermore, the valve plate is a multi-disc balance valve, and the scraper is a circumferential ring scraper and a multi-blade scraper. The valve plate is installed at the bottom of the main pipe of the bridge pipe tee. The bottom of the main pipe of the valve plate is also provided with a socket. The top of the main pipe of the bridge pipe tee is provided with a high- and low-pressure ammonia water spraying device. The spraying device can spray ammonia water that is sparse on the raw coal gas inlet side and dense on the opposite side of the raw coal gas inlet side, thereby forming coke that does not stick to the pipe wall at the C-shaped opening formed by the bridge pipe tee and the bridge pipe horizontal pipe connection. The multi-disc balance valve includes a multi-disc sealing valve seat, a multi-disc valve disc shaft, an eccentric multi-disc valve plate, a self-adjusting valve shaft, a hydraulic cylinder fixing bracket, a hydraulic cylinder, and a hydraulic cylinder drive chain rod.

[0020] Furthermore, the multi-disc balancing valve automatically regulates the pressure at the bottom of the carbonization chamber to be greater than 5Pa through mechanical counterweight of the valve disc and / or external spring type. The multi-disc balancing valve and the bridge pipe tee are two sections connected by flanges.

[0021] This invention discloses an online self-cleaning pressure regulating method and system for a single-hole carbonization chamber riser pipe system. On one hand, a scraper installed inside the horizontal pipe or the tee after the bridge pipe can rotate and move axially, thereby scraping away coke and tar deposits from the inner wall of the pipe and the valve plate. This ensures that the valve plate can open and close by its own weight or counterweight to achieve pressure regulation, eliminating the need for a hydraulic system to drive the opening and closing. This also eliminates the need for electrical components such as wires and instruments, avoiding the problem of electrical components, wires, and instruments malfunctioning due to heat exposure in the flame. On the other hand, a drive motor is used to drive... The winding and unwinding of the threaded chain rod shaft in the chain rod machine storage box enables the axial movement of the threaded chain rod shaft inside the tube, which in turn drives the scraper to move axially inside the tube and pass through the valve plate. This allows the scraper to remove coke and tar deposits from the inner wall of the tube and the valve plate. The process does not require the coke oven to be shut down, thus ensuring the cleanliness of the valve plate surface at all times. This allows the valve plate to use its own counterweight to achieve pressure regulation. Compared with traditional technology, this technical solution extends the service life of the valve plate while ensuring the accuracy of pressure regulation, solving the pressure regulation problem that has always existed in the carbonization chamber. Attached Figure Description

[0022] Figure 1 This is a structural reference diagram of the present invention; Figure 2 This is a structural diagram of the threaded chain rod shaft of the present invention; Figure 3 This is a diagram showing the nozzle distribution of the high and low pressure ammonia water spraying device at the center of this invention. Figure 4 For the present invention Figure 1 Cross-sectional view at point AA; Figure 5 This is a reference diagram of the mechanical counterweight pressure regulating valve structure of the present invention; Figure 6 This is a reference diagram of the bridge tube rear tee structure of the present invention; Figure 7 For the present invention Figure 6 Cross-sectional view at point BB; Figure 8 For the present invention Figure 7 Cross-sectional view at point DD; Figure 9 For the present invention Figure 7 Cross-sectional view at EE; Figure 10 For the present invention Figure 4 Cross-sectional view at the FF section.

[0023] Reference numerals: 1. Bridge pipe front tee; 2. Bridge pipe horizontal pipe; 3. Bridge pipe rear tee; 4. Threaded chain rod shaft; 5. Storage cavity; 6. Scraper; 7. Mechanical counterweight pressure regulating valve; 8. Multi-disc balance valve; 9. Central high and low pressure ammonia spraying device; 10. Drive motor; 11. Chain rod sealing cavity; 12. Chain rod machine storage box; 13. Positioning pin; 14. Telescopic low-pressure ammonia axial nozzle; 15. Chain rod shaft joint; 71. Counterweight valve seat; 72. Counterweight valve plate; 73. Horizontal pipe large opening saddle flange; 74. High-pressure ammonia-driven hydraulic cylinder; 81. Multi-disc sealing valve seat; 82. Multi-disc valve disc shaft; 83. Offset multi-disc valve plate; 84. Self-adjusting valve shaft; 85. Hydraulic cylinder fixing bracket; 86. Hydraulic cylinder; 87. Hydraulic cylinder drive chain rod. Detailed Implementation

[0024] To make the technical means, technical features, inventive purpose and technical effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0025] Example 1 like Figure 1 and Figure 2 As shown, this embodiment provides an online self-cleaning pressure-regulating riser pipe system for a single-hole carbonization chamber. The telescopic mechanical riser pipe online coking device has a threaded chain shaft 4 passing through a wall bearing box and driven by a motor to rotate a nut on the fixed wall. The threaded chain shaft 4 is a single-segment threaded chain of a certain length connected to an adjacent continuous threaded chain. The threaded chain shaft 4 is composed of multiple chain shaft sections 15, each section having the same continuous large thread. The threaded chain shaft 4 connects two adjacent shaft sections together to form a chain shaft of a certain length, which is positioned by the locating pin 13 of the chain shaft. After the two shaft sections are connected, the continuity of the shaft thread is ensured, guaranteeing the straightness and rigidity of the shaft, and driving the scraper 6 at the shaft end to move axially or rotate.

[0026] A single-hole carbonization chamber online self-cleaning pressure regulating riser pipe system, such as Figure 5As shown, the horizontal tube counterweight pressure self-adjusting valve device (application number: 202411409922.8) has a counterweight valve seat 71 inside the horizontal tube wall. The end face of the counterweight valve seat 71 is sealed with the edge of the counterweight valve plate 72 in its natural state. The valve plate shaft is fixed to the wall of the horizontal tube's large-opening saddle-shaped flange 73. The horizontal tube's large-opening saddle-shaped flange 73 is connected to a detachable counterweight valve plate 72. The horizontal tube's large-opening saddle-shaped flange 73 is equipped with a high-pressure ammonia-driven hydraulic cylinder 74. When the high-pressure ammonia is started, the hydraulic cylinder 86 drives the counterweight valve plate 72 to fully open. When the high-pressure ammonia stops, the hydraulic cylinder 86... When the counterweight valve plate 72 is fully open, the inner wall of the horizontal tube is a smooth cylinder. At this time, the coal feeding valve plate in the carbonization chamber is fully open, spraying high-pressure ammonia to draw negative pressure and prevent coal smoke from leaking out. Under normal operation, when the high-pressure ammonia stops, the high-pressure ammonia-driven hydraulic cylinder 74 depressurizes, causing the valve plate to be driven to the closed position. The valve plate 72 swings naturally to form a pressure of more than 5 Pa at the bottom of the carbonization chamber; the valve plate shaft is fixed to the wall of the saddle-shaped flange of the large horizontal pipe, characterized in that the shaft end fixed to the pipe wall is provided with a packing seal and / or a gas sealing cavity, and the pressure in the sealing cavity is greater than the pressure in the horizontal pipe; the gas seal is characterized in that the sealing gas is an inert gas such as nitrogen or coke oven gas, and the mechanical counterweight pressure regulating valve 7 includes a counterweight valve seat 71, a counterweight valve plate 72, a large-opening saddle-shaped flange of the horizontal pipe 73, and a hydraulic cylinder 74 driven by high-pressure ammonia water.

[0027] Example 2 Under the same conditions, the valve plate is characterized in that when the valve plate is fully open, the inner wall of the horizontal tube is the valve plate plane embedded in the cylindrical surface; when the valve plate is fully open, the top surface of the horizontal tube at this position is the valve plate plane; and when the valve plate is fully closed, a pressure of 5 Pa is formed at the bottom of the carbonization chamber.

[0028] The self-balancing automatic pressure regulating valve plate assembly device, such as Figure 4 and Figure 10 As shown, the multi-disc eccentric self-weight closing multi-disc valve will open the valve plate to ensure the flow of raw coal gas when the pressure at the bottom of the carbonization chamber is greater than 5Pa. When the pressure at the bottom of the carbonization chamber is less than or equal to 5Pa, the pressure of raw coal gas from the carbonization chamber is insufficient to open the valve plate to ensure the flow of raw coal gas and will close the valve.

[0029] The multi-disc valve can be powered by pressure from a rotating spring at the shaft end. When the pressure at the bottom of the carbonization chamber is greater than 5 Pa, the pressure of the raw coal gas in the carbonization chamber will open the valve plate to ensure the flow of raw coal gas. When the pressure at the bottom of the carbonization chamber is less than or equal to 5 Pa, the pressure of the raw coal gas in the carbonization chamber is insufficient to open the valve plate to ensure the flow of raw coal gas and will close the valve. The multi-disc balance valve includes a multi-disc sealing valve seat 81, a multi-disc valve disc shaft 82, an eccentric multi-disc valve plate 83, a self-adjusting valve shaft 84, a hydraulic cylinder fixing bracket 85, a hydraulic cylinder 86, and a hydraulic cylinder drive chain rod 87.

[0030] Example 3 In Examples 1 and 2, the outer body has a hydraulic cylinder 74 driven by high-pressure ammonia water. When it is necessary to increase the negative pressure value by spraying high-pressure ammonia water, the hydraulic cylinder 86 driven by high-pressure ammonia water adjusts the valve plate of Examples 1 and 2 to the maximum opening. When it is not necessary to increase the negative pressure value by spraying high-pressure ammonia water, the high-pressure ammonia water stops, and the valve plate of Examples 1 and 2 is adjusted to the closed position. In the natural state, the valve plate relies on its self-counterweight to form a stable pressure. The automatic pressure regulation of the raw coal gas fluid ensures that the pressure at the bottom of the carbonized stone is greater than 5Pa.

[0031] Example 4 The riser pipe system does not have the valve plate of Embodiments 1 and 2. Instead, a baffle chain rod is installed at the position of Embodiment 1. The chain rod baffle is perpendicular to the direction of raw coal gas flow. The magnitude of the raw coal gas flow rate drives the chain rod baffle to swing. This swing is mechanically interlocked outside the pipe to control the amount of ammonia water sprayed, so that the sprayed ammonia water adjusts the pressure at this position, thereby controlling the pressure in the carbonization chamber to be greater than 5 Pa.

[0032] A single-hole carbonization chamber online self-cleaning pressure-regulating riser pipe system includes a scraper 6. The scraper 6 is used on the main pipe of the bridge pipe tee 1, the riser pipe, and the pipe seat. This scraper 6 can penetrate to the same diameter as the coke oven raw gas outlet pipe seat. The structure for cleaning the coke inside the bridge pipe horizontal pipe 2 and the bridge pipe rear tee 3 is the same. In embodiment one, when axial movement is used to clean the inner wall of the riser pipe, the scraper 6 is a circumferential ring scraper 6. In embodiment two, when a hanging-rotational axial movement is used to clean the inner wall of the riser pipe, the scraper 6 is a multi-blade scraper 6 structure. like Figure 3 As shown, the central nozzles of the rotating chain shaft are unevenly arranged in the circumferential direction. There are fewer nozzles on the side of the raw coal gas inlet and more on the other half. The sprayed ammonia water forms a mixture. The raw coal gas enters the C-shaped distribution port from the horizontal pipe and begins to turn downwards. It cools down as a result. At the rear end of the C-shaped port, there will be condensed viscous coal tar. The C-shaped port forms this condensed viscous coal tar on the wall of the bridge pipe, preventing it from sticking to the pipe wall and forming coke. This keeps the bridge pipe unobstructed during online coke removal and achieves self-cleaning of the bridge pipe.

[0033] like Figure 6 As shown, the top of the bridge pipe tee 3 is equipped with high and low pressure ammonia water nozzles. The ammonia water nozzles are positioned around the chain-shaft type mechanical coking rod at the top of the tee's vertical pipe. During the half-cycle of raw coal gas inflow, the low-pressure ammonia water nozzle atomizes droplets with a fine particle size. The ammonia water injected in this part only appropriately cools the raw coal gas to a temperature of 450℃ or higher. During the half-cycle of raw coal gas inflow, the low-pressure ammonia water nozzle atomizes droplets with a fine particle size but a large flow rate. Figure 7 As shown, the ammonia water injected in this section only cools the raw coal gas to a temperature of about 90°C; specifically, the cross-sectional shape of the ammonia water sprayed from the top is C-shaped, and the raw coal gas flows into the sprayed C-shaped interface of the rear tee section after passing through the horizontal pipe 2 of the bridge pipe. The online self-cleaning pressure regulating method of the rear tee 3 of the bridge pipe is as follows: Figure 8 and Figure 9 As shown, the ammonia water spray fluid at the top of the rear tee forms a C-shape. When the raw coal gas flows into the rear tee, it flows into this C-shape to the rear end. Here, the raw coal gas is rapidly cooled by the ammonia water to about 90°C. The working principle is that when the raw coal gas is cooled to below 450°C, it will liquefy to form viscous substances such as condensate asphalt, which adhere to the vessel wall. The C-shaped spray means that the raw coal gas does not reach the vessel wall after condensation and will not adhere to the vessel wall. Instead, it continues to cool as the spray liquid falls, forming an ammonia water mixture that increases fluidity. It flows out of this position with the mixture, forming ammonia water spray self-cleaning. At the same time, due to the amount of ammonia water sprayed, a local pressure change is formed at this position, thereby adjusting the carbonization chamber pressure to not less than 5Pa. The automatic adjustment of the carbonization chamber pressure comes from the nozzle flow adjustment after the mechanical lever inside the horizontal tube mode is amplified.

[0034] Example 5 The single-hole carbonization chamber pressure regulating method includes a mechanical counterweight pressure self-regulating valve plate (application number: 202411409922.8) installed inside the horizontal pipe. When high-pressure ammonia spray is used to increase the negative pressure value, the high-pressure ammonia water simultaneously drives the valve plate to its maximum opening degree through hydraulic cylinder 86. When the high-pressure ammonia water spray stops increasing the negative pressure value, the high-pressure ammonia water simultaneously releases the valve plate drive through hydraulic cylinder 86, and the valve plate automatically controls the carbonization chamber pressure in its free state. As an alternative method, a multi-disc pre-tightening self-sealing valve is installed below the main pipe side pipe of the bridge pipe tee 3. When the pressure at the bottom of the carbonization chamber is greater than 5 Pa, the raw coal gas distilled in the carbonization chamber opens the multi-disc valve plate, and the pressure of the carbonization chamber is automatically regulated according to the outflow of raw coal gas. When the pressure at the bottom of the carbonization chamber is less than or equal to 5 Pa, the raw coal gas distilled in the carbonization chamber cannot open the multi-disc valve plate, and the multi-disc valve plate closes to maintain the pressure at the bottom of the carbonization chamber greater than 5 Pa. As another alternative method... In Examples 1 and 2, the outer body has a hydraulic cylinder 74 driven by high-pressure ammonia water. When it is necessary to increase the negative pressure value by spraying high-pressure ammonia water, the hydraulic cylinder 86 driven by high-pressure ammonia water adjusts the valve plate of Examples 1 and 2 to the maximum opening. When it is not necessary to increase the negative pressure value by spraying high-pressure ammonia water, the high-pressure ammonia water stops, and the valve plate of Examples 1 and 2 is adjusted to the closed position. In the natural state, the valve plate relies on its self-weight to form a stable pressure, automatically regulating the pressure of the raw coal gas fluid to ensure that the pressure at the bottom of the carbonized stone is greater than 5Pa. As another alternative, the riser system does not have the valve plates of Examples 1 and 2, but instead has a stainless steel pressure chamber diaphragm at the position of Example 1. The inner wall of the diaphragm is the same as the inner diameter of the bridge pipe horizontal pipe 2. The flow rate of the raw coal gas drives the amplitude of the stainless steel pressure chamber diaphragm. The amplitude of the amplitude of the stainless steel pressure chamber diaphragm is mechanically amplified and interlocked to control the amount of ammonia water sprayed, so that the sprayed ammonia water adjusts the pressure at this position, thereby controlling the pressure in the carbonization chamber to be greater than 5Pa.

[0035] The online self-cleaning functions of the water seal cover, bridge pipe front tee 1, riser pipe and pipe seat, front tee side pipe, bridge pipe horizontal pipe 2, bridge pipe rear tee 3 side pipe and bridge pipe rear tee 3 operate in a time-differential manner.

[0036] The horizontal tube mechanical counterweight pressure regulating valve 7 and the rear three-way multi-disc pressure regulating valve are used only one. That is, if the horizontal tube mechanical counterweight pressure regulating valve 7 is used, the rear three-way multi-disc pressure regulating valve is not needed.

[0037] The scraper 6 is characterized in that the scraper 6 rotates with the chain shaft to achieve mechanical coke removal, or the scraper 6 does not rotate with the chain shaft, but only moves axially with the chain shaft to achieve mechanical coke removal, or it rotates and moves to achieve mechanical coke removal.

[0038] Includes a water seal cover, bridge pipe front tee 1, bridge pipe horizontal pipe 2, bridge pipe rear tee 3, riser pipe, and pipe seat.

[0039] The main pipe of the bridge pipe front tee 1 is connected to the riser pipe water seal cover. The side pipe of the bridge pipe front tee 1 is coaxially connected to the horizontal pipe flange. The bridge pipe horizontal pipe 2 is coaxially connected to the side pipe half flange of the bridge pipe rear tee 3. The bridge pipe horizontal pipe 2 is connected to the side pipe flange of the bridge pipe front tee 1.

[0040] Example 6 This embodiment provides an online self-cleaning pressure regulation method for a single-hole carbonization chamber riser pipe system, such as... Figure 1 , Figure 4 and Figure 10 As shown, an online coking device for the horizontal pipe 2 of the bridge pipe is installed inside the tee 3 after the bridge pipe, and a mechanical counterweight type one-way valve plate self-pressure regulating device is installed inside the horizontal pipe 2. The mechanical counterweight type one-way valve plate self-pressure regulating device adjusts the pressure by controlling the opening of the valve plate to control the gas flow area of ​​the raw coal gas, thereby controlling the pressure of the coke oven carbonization chamber. The mechanical counterweight type one-way valve plate regulating device includes the horizontal pipe 2 of the bridge pipe, a valve plate hanging device, a valve plate, a valve plate shaft, a bearing, a valve seat, and an external drive device for the bridge pipe. The outer diameter of the valve plate is equal to the inner diameter of the bridge pipe. The valve plate and valve seat are sealed at their mating surfaces, which are inclined at a certain angle to the axis of the horizontal pipe. The pressure generated by the axial component of the valve plate achieves a constant pressure control of 5+5Pa at the bottom of the coke oven carbonization chamber. In actual design and application, a constant pressure control of 10Pa or more at the bottom of the coke oven carbonization chamber can be achieved. The valve plate is suspended on the wall of the bridge pipe, and the inner diameter of the valve plate is the inner diameter of the bridge pipe. The wall thickness of the bridge pipe is the width of the sealing surface. The outer wall of the horizontal pipe 2 of the bridge pipe is provided with a heat insulation layer, which ensures that the temperature of the raw coal gas inside the bridge pipe is greater than 450℃. like Figure 5As shown, the bridge pipe tee 3 uses an online coking self-cleaning pressure regulation method. An eccentric mechanical counterweight is installed on the vertical pipe of the bridge pipe tee 3 to automatically control the valve plate opening. This adjusts the flow area of ​​the gas-liquid mixture of raw coal gas liquid phase and coke oven gas gas phase, achieving a constant pressure control of 5+5Pa at the bottom of the coke oven carbonization chamber. In actual design and application, a constant pressure control of 10Pa or more at the bottom of the coke oven carbonization chamber can be achieved. The online coking self-cleaning method involves installing an online coking device on the top of the vertical pipe of the bridge pipe tee 3.

[0041] like Figure 2 As shown, the rear tee is equipped with an online descaling device for the horizontal tube 2 of the bridge tube. The device is characterized by including a scraper 6 end, a chain rod shaft, a chain rod shaft seat and its drive motor 10, a bridge tube rear tee 3, a scraper 6 storage box, and a chain rod shaft storage device. The scraper 6 is divided into a circumferential ring scraper 6 and a multi-blade scraper 6. When the valve plate is closed, the multi-blade scraper 6 is used to clean the outer surface of the valve plate online by rotation. When the valve plate is fully open, the circumferential ring scraper 6 is used to clean the inner surface of the valve plate online. The scraper 6 storage box is characterized by having an inner diameter that is the same as the inner diameter of the vertical tube of the bridge tube rear tee 3.

[0042] When cleaning the bridge pipe front tee 1, bridge pipe horizontal pipe 2 and bridge pipe rear tee 3, the external motor drives the threaded chain shaft 4 to rotate and the axial movement device is installed on the outer wall of the main pipe of the bridge pipe rear tee 3. The valve plate adopts a mechanical counterweight pressure regulating valve 7 and the valve plate is installed inside the bridge pipe horizontal pipe 2.

[0043] The valve plate adopts a multi-lobed eccentric balance valve plate. The valve plate is normally closed. When coal tar and coke oven gas pass through, they act on the multi-lobed eccentric balance valve plate. The eccentric part with a smaller area is adjusted by the pressure of coal tar and coke oven gas to achieve a constant pressure control of 5+5Pa at the bottom of the coke oven carbonization chamber. In actual design and application, a constant pressure control of 10Pa or more at the bottom of the coke oven carbonization chamber can be achieved. The valve plate is installed at the bottom of the bridge pipe tee 3. The online self-cleaning, motor-driven threaded chain shaft 4 rotation and axial movement device is installed on the outer wall of the top cover of the bridge pipe tee 3.

[0044] like Figure 3 and Figure 6 As shown, a circularly distributed, high-pressure ammonia water spraying device with a center height of 9 and a low pressure is installed on the top cover of the tee 3 after the bridge pipe. The ammonia water sprayed sparsely on the raw coal gas inlet side and densely on the other raw coal gas inlet sides, thereby causing coking that does not stick to the horizontal pipe wall to form at the C-shaped opening formed by the connection between the tee 3 after the bridge pipe and the horizontal pipe 2.

[0045] This embodiment also provides an online self-cleaning pressure regulating system for a single-hole carbonization chamber riser pipe system, including a bridge pipe front tee 1, a bridge pipe horizontal pipe 2, and a bridge pipe rear tee 3, as well as an external motor driving the threaded chain shaft 4 to rotate and move axially, and a valve plate placed in the bridge pipe horizontal pipe 2 or the bridge pipe rear tee 3. The side pipes of the bridge pipe front tee 1, the bridge pipe horizontal pipe 2, and the bridge pipe rear tee 3 are coaxially connected. Preferably, the external motor-driven rotating and axial movement device for the threaded chain shaft 4 includes the threaded chain shaft 4, a guide frame and scraper 6 installed at one end of the threaded chain shaft 4, a chain machine storage box 12, a drive motor 10, a chain sealing cavity 11, the scraper 6, and a storage cavity 5. When the scraper 6 is retracted into the storage cavity 5, the storage cavity 5 and the top of the scraper 6 perform a shearing scraping to remove the graphite or condensate tar on it and remove the coke. After the scraper 6 enters the storage cavity 5, the storage cavity 5 is closed in a half-hidden indoor and outdoor extension manner. During the closing process, the graphite or condensate tar under the scraper 6 is removed, thus achieving front cleaning of the scraper 6.

[0046] Preferably, the valve plate is a mechanical counterweight pressure regulating valve 7, which includes a counterweight valve seat 71, a counterweight valve plate 72, a horizontal pipe large-opening saddle-shaped flange 73, and a high-pressure ammonia-driven hydraulic cylinder 74. The scraper 6 is a circumferential ring scraper 6 and a multi-blade scraper 6. The valve plate is located on the horizontal pipe 2 of the bridge pipe near the front tee 1 of the bridge pipe. Preferably, the chain rod machine storage box 12, drive motor 10, chain rod sealing cavity 11 and storage cavity 5 are installed on the main pipe side wall of the bridge pipe rear tee 3, and the threaded chain rod shaft 4, guide frame and scraper 6 are installed inside the bridge pipe horizontal pipe 2. Preferably, the scraper 6 is tightly inserted into the receiving cavity 5, and its outer surface is the same curved surface as the wall of the side tube and the main tube; the threaded chain shaft 4 is provided with a packing seal and / or an external gas seal cavity through the chain shaft cover or the tube wall.

[0047] Preferably, the bridge pipe 2 at the top rear of the valve plate is provided with a flange sealing large opening in the upper and lower parts, and a telescopic low-pressure ammonia water axial spray nozzle 14 is provided on the large opening.

[0048] Preferred, such as Figure 7 , Figure 8 and Figure 9As shown, the valve plate is a multi-disc balance valve 8, and the scraper 6 is a circumferential ring scraper 6 and a multi-blade scraper 6. The valve plate is installed at the bottom of the main pipe of the bridge pipe tee 3. The bottom of the main pipe of the valve plate is also provided with a socket. The top of the main pipe of the bridge pipe tee 3 is provided with a high- and low-pressure ammonia water spraying device. The spraying device can spray out sparse ammonia water on the raw coal gas inlet side and dense ammonia water away from the raw coal gas inlet side, thereby forming coking that does not stick to the pipe wall at the C-shaped opening formed by the connection of the bridge pipe tee 3 and the bridge pipe horizontal pipe 2. The multi-disc balance valve includes a multi-disc sealing valve seat 81, a multi-disc valve disc shaft 82, an eccentric multi-disc valve plate 83, a self-adjusting valve shaft 84, a hydraulic cylinder fixing bracket 85, a hydraulic cylinder 86, and a hydraulic cylinder drive chain rod 87.

[0049] Preferably, the multi-disc balancing valve 8 regulates the pressure at the bottom of the carbonization chamber to be greater than 5 Pa through mechanical counterweight of the valve disc and / or external spring-type automatic pressure regulation. The multi-disc balancing valve 8 and the bridge pipe tee 3 are two sections connected by flanges.

[0050] The reason for using a chain rod shaft is to consider the limited operating space around the riser pipe. In actual design and application, when the surrounding air drop is permissible, a rigid shaft can be used to achieve all functions more simply. The advantage of this is that the structure is simpler and the cost and management are more cost-effective.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention. All equivalent changes and modifications made in accordance with the scope of the claims of this invention should fall within the technical scope of this invention.

Claims

1. An online self-cleaning pressure regulation method for a single-hole carbonization chamber riser pipe system, characterized in that, An online coking device for the horizontal pipe (2) of the bridge pipe is installed in the tee (3) after the bridge pipe. A mechanical counterweight one-way valve plate pressure regulating device is installed in the horizontal pipe (2). The regulating method is to control the gas flow area of ​​the raw coal gas by controlling the valve plate opening, so as to control the pressure of the coke oven carbonization chamber. The mechanical counterweight type one-way valve plate pressure regulating device includes a bridge pipe horizontal pipe (2), a valve plate hanging device, a valve plate, a valve plate shaft, a bearing, a valve seat and a bridge pipe external drive device. The valve plate and the valve seat are sealed at the mating surface. The mating surface is inclined at a certain angle to the axis of the horizontal pipe. The valve plate is hung on the wall of the bridge pipe. The outer wall of the bridge pipe horizontal pipe (2) is provided with a heat insulation layer. The heat insulation layer ensures that the temperature of the raw coal gas in the bridge pipe is greater than 450℃. The online descaling device for the horizontal tube of the bridge pipe (2) includes a scraper (6) end, a chain shaft, a chain shaft seat and its drive motor (10), a bridge pipe rear tee (3), a scraper (6) storage box, and a chain shaft storage device. The scraper (6) is divided into a circumferential ring scraper and a multi-blade scraper. When the valve plate is closed, the multi-blade scraper is used to clean the outer surface of the valve plate online by rotating. When the valve plate is fully open, the circumferential ring scraper is used to clean the inner surface of the valve plate online. The inner diameter of the scraper (6) storage box is the same as the inner diameter of the vertical tube of the bridge pipe rear tee (3). The threaded chain shaft (4) is composed of multiple chain shaft sections (15). Each section has the same continuous large thread. The threaded chain shaft (4) is formed by connecting two adjacent sections together with a chain to form a chain shaft of a certain length. It is positioned by the positioning pin (13) of the chain to form a chain shaft. After the two sections are connected, the continuity of the shaft thread is ensured, the straightness and rigidity of the shaft are guaranteed, and the end scraper (6) is driven to move axially or rotate. The side pipe of the bridge pipe front tee (1), the bridge pipe horizontal pipe (2), and the side pipe of the bridge pipe rear tee (3) are coaxially connected; the bridge pipe horizontal pipe (2) is located between the bridge pipe front tee (1) and the bridge pipe rear tee (3).

2. The online self-cleaning pressure regulating method for a single-hole carbonization chamber riser pipe system according to claim 1, characterized in that: When cleaning the bridge pipe front tee (1), bridge pipe horizontal pipe (2) and bridge pipe rear tee (3), the external motor drive threaded chain shaft (4) rotation and axial movement device is installed on the outer wall of the main pipe of the bridge pipe rear tee (3).

3. The online self-cleaning pressure regulating method for a single-hole carbonization chamber riser pipe system according to claim 1, characterized in that: The top of the bridge pipe tee (3) is equipped with high and low pressure ammonia water nozzles.

4. A pressure regulating system for an online self-cleaning pressure regulating method for a single-hole carbonization chamber riser pipe system as described in claim 1, comprising a bridge pipe front tee (1), a bridge pipe horizontal pipe (2), and a bridge pipe rear tee (3), characterized in that: It also includes an external motor driving the threaded chain shaft (4) to rotate and axially move, as well as a valve plate placed in the bridge tube horizontal tube (2), and the side tubes of the bridge tube front tee (1), the bridge tube horizontal tube (2), and the bridge tube rear tee (3) are coaxially connected; The external motor drives the threaded chain shaft (4) to rotate and move axially. The device includes the threaded chain shaft (4), a guide frame and a scraper (6) installed at one end of the threaded chain shaft (4), a chain machine storage box (12), a drive motor (10), a chain sealing cavity (11), a scraper (6) and a storage cavity (5).

5. The pressure regulating system of the online self-cleaning pressure regulating method for a single-hole carbonization chamber riser pipe system according to claim 4, characterized in that: The chain rod machine storage box (12), drive motor (10), chain rod sealing cavity (11) and storage cavity (5) are installed on the main side wall of the bridge pipe rear tee (3), and the threaded chain rod shaft (4), guide frame and scraper (6) are installed inside the bridge pipe horizontal tube (2).

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