Method for shortening starting time of circulating ammonia water system of coke oven
By setting up steam pipes in the coke oven circulating ammonia water tank to heat the boiler steam, the problem of long start time of the coke oven circulating ammonia water system is solved, and the appropriate temperature is quickly reached, which shortens the start time of the coke oven and reduces costs.
Patent Information
- Application Number
- CN202411462203.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-18
- Publication Date
- 2025-01-14
AI Technical Summary
The traditional coke oven circulating ammonia water system has a long start time, especially in winter, it takes 6-7 days to reach the appropriate temperature, which affects the normal start of the coke oven, and the traditional heating method has safety hazards and low efficiency problems.
Set up steam pipes in the circulating ammonia water tank, use the steam generated by the boiler to heat the circulating ammonia water, shorten its heating time, and increase the ammonia water temperature to 60℃ in advance to facilitate the rapid production of the coke oven system.
By increasing the heating of circulating ammonia in steam pipelines, the start time of coke ovens is shortened, and the demand for coal loading of coke ovens is met within 1-2 days, greatly reducing costs and improving efficiency.
Smart Images
Figure CN119307288A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of coke ovens, in particular to a method for shortening the start-up time of a circulating ammonia water system of a coke oven. Background Art
[0002] A coke oven is an industrial kiln that distills coking coal into coke in an air-tight manner. The main products are coke, coke oven gas and chemical products. The production characteristics of coke ovens are continuous, and the life of a generation of ovens is generally designed to be 25 years. The high-temperature raw gas (about 800°C) generated during the coking process is cooled by ammonia water (about 80°C) and mixed with ammonia water and tar along the gas collecting pipe and the air intake pipe to the gas-liquid separator. The raw gas is pumped by the blower to the subsequent gas purification. The process of coke oven operation includes: changing the oven state to the normal heating state, the coke oven machinery starts trial production and runs well, trial production coal loading, and the circulating ammonia system runs stably, and the formal coal loading and blower start, etc.
[0003] The key step in coke oven operation is to increase the circulating ammonia water to a suitable temperature to ensure the normal spraying of ammonia water in the coke oven. The traditional operation method is to start the operation by transferring ammonia water from other devices (discontinued or in operation) or inserting steam pipes (rubber hoses, etc.) into the manhole of the separation tank to directly heat the clean water. The former has the problem of slow transfer process, and if the operation is started by transferring ammonia water, secondary disasters will occur once an abnormal situation occurs; the latter uses steam direct heating. Due to the high steam pressure, the rubber hose in the manhole of the separation tank is not easy to fix, and the heating effect is not good. The circulating ammonia water required by the normal coke oven is not easy to be heated to the required temperature in a short time, especially in winter. The start time of the ammonia water system is 6-7 days to meet the temperature requirements for spraying ammonia water in the coke oven, which seriously affects the normal start-up time of the coke oven. Summary of the invention
[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a method for shortening the start-up time of a coke oven circulating ammonia water system. By adding a steam pipe in a circulating ammonia water tank, the steam generated by the boiler can be used to heat the circulating ammonia water. The ammonia water temperature can be raised to a set temperature in advance when the supporting project is still under construction. After the predetermined coal loading time is reached, the circulating ammonia water system and the coke oven system can be put into production in a short time.
[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:
[0006] A method for shortening the start-up time of a coke oven circulating ammonia water system, comprising the following steps:
[0007] The coke oven system and the circulating ammonia water system are connected. A steam pipe is set in the coking vertical tar ammonia water separation tank in the circulating ammonia water system. Before the coke oven is started, steam is introduced into the steam pipe to heat the circulating ammonia water. By adding a heating node for the circulating ammonia water, the heating time for the circulating ammonia water to be heated to the set temperature is shortened.
[0008] As a further implementation, the coking vertical tar ammonia water separation tank includes an internal separation tank and a circulating ammonia water tank located at the bottom of the separation tank, and the steam pipeline is arranged in the circulating ammonia water tank.
[0009] As a further implementation method, the bottom of the separation tank is funnel-shaped, a cylindrical structure is arranged outside the separation tank, and a circulating ammonia water tank is formed between the cylindrical structure and the separation tank.
[0010] As a further implementation method, the steam pipe is wrapped around the bottom end of the separation tank inside the circulating ammonia water tank to form a coil structure.
[0011] As a further implementation, both ends of the steam pipe penetrate the cylindrical structure and extend to the outside, forming a steam inlet and a condensed water outlet respectively.
[0012] As a further implementation method, the coil structure is fixed by using a support member, and the support member is fixed between the coil structure and the bottom surface of the cylindrical structure.
[0013] As a further implementation method, the height of the steam inlet is higher than the height of the condensate outlet, the coil structure is distributed in a spiral shape, and gradually approaches the bottom center of the cylindrical structure from top to bottom.
[0014] As a further implementation method, the steam inlet of the steam pipe is connected to the boiler through a steam transmission pipe. In the early stage of the coke oven start-up, the high-temperature steam generated by the boiler enters the steam pipe through the steam transmission pipe to heat the circulating ammonia water in the circulating ammonia water tank, thereby shortening the heating time of the circulating ammonia water and thus shortening the start-up time of the coke oven.
[0015] As a further implementation, the coil structure should use stainless steel pipes.
[0016] As a further implementation, the steam pipe and the cylindrical structure are sealed.
[0017] The beneficial effects of the present invention are as follows:
[0018] The present invention can heat the circulating ammonia water by using the steam generated by the boiler by adding a steam pipeline in the circulating ammonia water tank. When the supporting project is still under construction, the temperature of the ammonia water is raised to 60°C in advance. After the predetermined coal loading time is reached, the circulating ammonia water system and the coke oven system can be put into operation in a short time. In the early stage of the coke oven operation, the normal demand for coal loading of the coke oven can be quickly met by raising the temperature of the circulating ammonia water. The traditional circulating ammonia water system requires 6-7 days of circulation preparation time, but after adding a fixed steam pipeline, it only takes 1-2 days to meet the normal start-up needs of the coke oven, thereby greatly shortening the start-up time of the coke oven circulating ammonia water system, reducing costs for enterprises and improving benefits. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.
[0020] Figure 1 is a structural schematic diagram of a coke oven system in an embodiment of the present invention;
[0021] Figure 2 It is a schematic diagram of the structure of a coking vertical tar-ammonia water separation tank in an embodiment of the present invention.
[0022] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.
[0023] Among them: 1. separation tank, 2. circulating ammonia water tank, 3. support, 4. steam pipe, 5. tar ammonia water inlet, 6. tar outlet, 7. steam inlet, 8. condensed water outlet, 9. circulating ammonia water outlet, 10. tar residue outlet. DETAILED DESCRIPTION
[0024] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.
[0025] Embodiment 1
[0026] In a typical embodiment of the present invention, reference is made to Figure 1 As shown, a method for shortening the start-up time of the circulating ammonia water system of the coke oven is provided, by adding a fixed steam pipeline inside the vertical tar-ammonia water separation tank, raising the ammonia water temperature to 60°C in advance when the supporting project is still under construction, and after the scheduled coal loading time, the circulating ammonia water system can be put into operation in a short time.
[0027] It is understandable that if Figure 1As shown, in the coke oven system, the raw gas and circulating ammonia water of the coke oven enter the gas-liquid separator for gas-liquid separation, and then the raw gas passes through the washing tower, the horizontal tube primary cooler, the electric tar precipitator and the gas blower in turn to the subsequent process. The condensate and tar condensed from the horizontal tube primary cooler, the electric tar precipitator and the gas blower and other equipment are also sent to the tar-ammonia water separation device. Before being sent to the tar-ammonia water separation device, the circulating ammonia water after gas-liquid separation first enters the tar residue pre-separator for pre-separation of tar residue. The tar-ammonia water mixture then enters the tar-ammonia water separation tank (tar-ammonia water separation device) to realize the separation of circulating ammonia water, tar and tar residue. The separated circulating ammonia water is sprayed on the coke oven after waste heat recovery.
[0028] Therefore, the coke oven system needs to be connected to the tar-ammonia separation tank so that the tar-ammonia mixture can enter the tar-ammonia separation tank. The separated circulating ammonia needs to pass through the circulating ammonia tank and circulating ammonia pump in the tar-ammonia separation tank in turn and enter the coke oven for spray cooling. A lithium bromide waste heat recovery device can be connected in parallel between the coke oven and the circulating ammonia pump to obtain low-temperature water in summer.
[0029] Specifically, during the operation of the coke oven, the circulating ammonia water sent to the gas collecting pipe of the coke oven is separated into gas and liquid by the gas-liquid separator and then flows to the tar ammonia water separation device by gravity, and then is pumped to the coke oven for spraying through the circulating ammonia water pump. During this process, the coke oven should open the spray cocks at both ends of the gas collecting pipe ammonia water, remove the nozzle, remove the impurities in the ammonia water pipeline, and then open the ammonia water cleaning nozzles of the gas collecting pipe one by one to flush the dirt in the pipeline, and then open the bridge pipe spray cock and the vent pipe spray cock. The ammonia water pressure is maintained at about 0.2MPa. Check the spraying situation one by one, and if there is a leak, it should be handled in time. The ammonia water should be sprayed evenly, and special attention should be paid to avoid splashing into the carbonization chamber.
[0030] The process of coke oven start-up includes: changing the oven state to the normal heating state, the coke oven machinery starts trial production and runs well, trial production coal is loaded, the circulating ammonia system runs stably, and the blower is started after formal coal loading. The key step of coke oven start-up is to increase the circulating ammonia water to the appropriate temperature to ensure the normal spraying of the coke oven. Before the temperature of the circulating ammonia water is increased to the appropriate temperature, the coke oven cannot be officially started. However, the traditional method of heating the circulating ammonia water requires a long heating time, especially in the winter when the temperature is low. It takes 6-7 days to increase the circulating ammonia water to the appropriate temperature, which affects the normal start-up time of the coke oven.
[0031] In order to increase the heating speed of the circulating ammonia water, this embodiment sets a steam pipe in the coking vertical tar ammonia water separation tank in the circulating ammonia water system. After the coke oven system and the circulating ammonia water system are connected, before the coke oven is started, steam is introduced into the steam pipe to heat the circulating ammonia water, so as to shorten the heating time of the circulating ammonia water to the set temperature.
[0032] like Figure 2As shown, it is a schematic diagram of the structure of a coking vertical tar ammonia water separation tank, which includes an internal separation tank and an external cylindrical structure, a circulating ammonia water tank 2 is formed between the cylindrical structure and the separation tank, the bottom of the separation tank 1 is funnel-shaped, the circulating ammonia water tank 2 is located at the bottom of the separation tank 1, and a steam pipe is arranged in the circulating ammonia water tank 2, wherein, except for the steam pipe, the other structures of the coking vertical tar ammonia water separation tank are existing technologies, which are used to separate tar, circulating ammonia water and tar residue.
[0033] A tar-ammonia water inlet 5 is connected to the separation tank near the top. The mixed liquid of tar-ammonia water enters the coking vertical tar-ammonia water separation tank from the coke oven system through the tar-ammonia water inlet 5 for separation. The bottom end of the funnel-shaped separation tank 1 extends out of the bottom surface of the cylindrical structure to form a tar residue outlet 10 for separating the tar residue.
[0034] The separation tank 1 is provided with a tar outlet 6 for separating tar. A circulating ammonia water outlet 9 is provided on the side of the bottom end of the cylindrical structure. The separated circulating ammonia water enters the circulating ammonia water tank 2, and returns to the coke oven system through the circulating ammonia water outlet 9 and the corresponding pipeline under the action of the circulating ammonia water pump for spray cooling, thereby realizing the circulation of ammonia water.
[0035] In order to shorten the heating time of circulating ammonia water, a steam pipe is pre-installed inside the circulating ammonia water tank of the coking vertical tar ammonia water separation tank. The steam pipe surrounds the bottom side of the funnel-shaped separation tank inside the circulating ammonia water tank to form a coil structure.
[0036] Both ends of the steam pipe penetrate the cylindrical structure and extend to the outside, forming a steam inlet and a condensate outlet respectively. The coil structure should use stainless steel pipes for corrosion protection, and the steam pipe and the cylindrical structure should be sealed.
[0037] like Figure 2 As shown, the coil structure is fixed by a support 3, and the support 3 is fixed between the coil structure and the bottom surface of the cylindrical structure. The support 3 can adopt a support rod structure, one end of which is vertically welded to the bottom surface of the cylindrical structure, and the other end is welded to the steam pipe 4 (coil structure).
[0038] like Figure 2 As shown, the height of the steam inlet 7 is higher than that of the condensate outlet 8, the coil structure is distributed in a spiral shape, and gradually approaches the bottom center of the cylindrical structure from top to bottom, so that the coil structure is evenly distributed in the circulating ammonia water tank 2, thereby improving the heat exchange efficiency between steam and circulating ammonia water.
[0039] In order to pass high-temperature steam into the steam pipe, it is necessary to connect the steam inlet of the steam pipe to the boiler through a steam delivery pipe. In the early stage of the coke oven operation, the high-temperature steam generated by the boiler is used to enter the steam pipe through the steam delivery pipe to heat the circulating ammonia water in the circulating ammonia water tank. This can shorten the heating time of the circulating ammonia water. Compared with the existing technology, it can ensure that the temperature of the circulating ammonia water is raised to the specified temperature in advance, thereby shortening the start-up time of the coke oven.
[0040] By adding a steam pipe in the circulating ammonia water tank as mentioned above, the circulating ammonia water can be heated by using the steam generated by the boiler. The ammonia water temperature can be raised to 60°C in advance when the supporting projects are still under construction. After the scheduled coal loading time, the circulating ammonia water system and the coke oven system can be put into production in a short time.
[0041] In the early stage of coke oven operation, the temperature of circulating ammonia water can be raised to quickly meet the normal needs of coke oven coal loading. The traditional circulating ammonia water system requires 6-7 days of circulation preparation time, but after adding a fixed steam pipeline, it only takes 1-2 days to meet the normal start-up needs of the coke oven, greatly shortening the start-up time of the coke oven circulating ammonia water system, reducing costs for the enterprise and improving efficiency.
[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A method for shortening the start-up time of a coke oven circulating ammonia system, characterized in that: Here are the steps: The coke oven system and the circulating ammonia water system are connected. A steam pipe is set in the coking vertical tar ammonia water separation tank in the circulating ammonia water system. Before the coke oven is started, steam is introduced into the steam pipe to heat the circulating ammonia water. By adding a heating node for the circulating ammonia water, the heating time for the circulating ammonia water to be heated to the set temperature is shortened.
2. A method for shortening the start-up time of a coke oven circulating ammonia system according to claim 1, characterized in that: The coking vertical tar ammonia water separation tank comprises an internal separation tank and a circulating ammonia water tank located at the bottom of the separation tank, and the steam pipeline is arranged in the circulating ammonia water tank.
3. A method for shortening the start-up time of a coke oven circulating ammonia system according to claim 2, characterized in that: The bottom of the separation tank is funnel-shaped, a cylindrical structure is arranged outside the separation tank, and a circulating ammonia water tank is formed between the cylindrical structure and the separation tank.
4. A method for shortening the start-up time of a coke oven circulating ammonia system according to claim 3, characterized in that: The steam pipeline is inside the circulating ammonia water tank and surrounds the bottom side of the separation tank to form a coil structure.
5. A method for shortening the start-up time of a coke oven circulating ammonia system according to claim 4, characterized in that: The two ends of the steam pipe both penetrate the cylindrical structure and extend to the outside, forming a steam inlet and a condensed water outlet respectively.
6. A method for shortening the start-up time of a coke oven circulating ammonia system according to claim 4, characterized in that: The coil structure is fixed by a support member, and the support member is fixed between the coil structure and the bottom surface of the cylindrical structure.
7. A method for shortening the start-up time of a coke oven circulating ammonia system according to claim 5, characterized in that: The height of the steam inlet is higher than that of the condensate outlet, and the coil structure is distributed in a spiral shape and gradually approaches the bottom center of the cylindrical structure from top to bottom.
8. A method for shortening the start-up time of a coke oven circulating ammonia system according to claim 7, characterized in that: The steam inlet of the steam pipe is connected to the boiler through the steam transmission pipe. In the early stage of the coke oven operation, the high-temperature steam generated by the boiler enters the steam pipe through the steam transmission pipe to heat the circulating ammonia water in the circulating ammonia water tank, thereby shortening the heating time of the circulating ammonia water and thus shortening the coke oven operation time.
9. A method for shortening the start-up time of a coke oven circulating ammonia water system according to claim 5, characterized in that: The coil structure shall use stainless steel piping.
10. A method for shortening the start-up time of a coke oven circulating ammonia water system according to claim 9, characterized in that: The steam pipe is sealed with the cylinder structure.