Coke oven gas pressurization purification system

Abstract

The utility model relates to the technical field of coke oven gas purification, and provides a coke oven gas pressurization purification system which comprises a primary cooler, an air blower and a compressor. By arranging the air blower, the coke oven gas is boosted to 4000-6000 Pa (G), the suction force in front of the machine is convenient to control, the pressure of the gas collecting pipe is stabilized, meanwhile, appropriate working pressure is provided for subsequent benzene washing, the benzene washing tower is arranged behind the air blower, benzene, naphthalene and the like in the coke oven gas are fully removed, the yield of benzene is guaranteed, and the production cost is reduced. Meanwhile, stable operation of follow-up equipment cannot be influenced by precipitation of naphthalene, and tar in coal gas is fully removed by arranging the first mist catcher and the second mist catcher; according to the utility model, the compressor is arranged after benzene washing, the coke oven gas is pressurized to 0.6-0.8 MPa (G) by the compressor, and ammonia washing and desulfurization are further carried out, so that under the pressurized state, the ammonia washing and desulfurization efficiency is higher, the equipment and the pipeline are smaller, and the miniaturization of coke oven gas pressurized purification equipment is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of coke oven gas purification, in particular to a coke oven gas pressurization purification system. Background Art

[0002] With the upgrading of the coking industry, coke oven types are gradually developing in the direction of large-scale, the scale of coking is getting larger and larger, the amount of coke oven gas that needs to be processed is also getting larger and larger, and the demand for equipment and pipelines is also increasing accordingly, which brings many difficulties to the engineering design, equipment manufacturing and production process. The traditional coke oven gas purification process usually works under normal pressure. As the scale of the device increases, the device investment and land occupation are getting larger and larger, and equipment manufacturing, equipment installation, production maintenance, etc. are becoming more and more difficult. With the upgrading of the coking industry, new challenges are posed to the innovation and upgrading of the coke oven gas purification process. The advancement and miniaturization of the coke oven gas purification process are also imminent.

[0003] According to the search of China Utility Model Publication No.: CN216513720U, a coke oven gas pressurization and purification system is disclosed. By setting up a gas compressor, the coke oven gas can be pressurized by the gas compressor. After pressurization, ammonia washing, benzene washing and desulfurization operations are performed, which greatly reduces the amount of gas required to be processed, thereby making the equipment, pipelines, valves, etc. smaller and the floor space greatly reduced. In addition, by setting up a low-temperature methanol washing desulfurization tower, a low-temperature methanol washing process can be used instead of the traditional wet desulfurization process for desulfurization. This desulfurization method can remove the total sulfur in the coke oven gas to ≦10mg / Nm3, which not only greatly reduces the total sulfur content in the coke oven gas, but also does not produce desulfurization waste liquid, solving the problem of difficult treatment of desulfurization waste liquid in traditional coking production.

[0004] However, there are some problems that need to be considered when implementing the above technical solutions: First, after the initial cooling, the coke oven gas is directly pressurized by the compressor, which makes it difficult to control the suction force in front of the compressor, and it is difficult to stably control the pressure of the coke oven gas collecting pipe. In addition, the coke oven gas is only preliminarily removed from tar and naphthalene at normal pressure through cold drum and electric capture, and the coke oven gas is pressurized to above 0.6 MPa (G). Due to the high naphthalene content in the gas, a large amount of naphthalene will be precipitated during the subsequent gas compression process, causing blockage of the compressor and pipeline, affecting the long-term stable operation of the subsequent system. Secondly, the raw gas without benzene will precipitate in large quantities during the compression, ammonia washing and other processes, resulting in a large loss of benzene and affecting the ammonia washing effect. Thirdly, during the initial cooling, the cooling pipe will be attached to the surface by impurities in the coke oven gas, and the traditional fixed-shape spray cleaning cannot thoroughly rinse the surface of the cooling pipe, resulting in a decrease in cooling efficiency, and the water after flushing cannot be reused, resulting in waste. Utility Model Content

[0005] The purpose of the present invention is to provide a coke oven gas pressurization and purification system to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a coke oven gas pressurized purification system, comprising a pre-cooler, the air inlet of the pre-cooler is connected to the coke oven gas outlet pipe, the outlet pipe of the pre-cooler is connected to a first mist catcher, the first mist catcher pipe is connected to a blower, the blower pipe is connected to a benzene washing tower, the benzene washing tower pipe is connected to a second mist catcher, the second mist catcher pipe is connected to a compressor, the compressor pipe is connected to an ammonia washing tower, the ammonia washing tower pipe is connected to a desulfurization tower, and the outlet of the desulfurization tower is connected to a user interface.

[0007] Preferably, the first mist collector and the second mist collector are electric tar precipitators.

[0008] Preferably, the pre-cooler includes an outer shell, a threaded rod, a water pump and a filter plate. An inspection port is provided on the front of the outer shell, an air inlet pipe is fixedly connected to the left side of the outer shell, a partition is fixedly connected to the inside of the outer shell, a cooling pipe is provided above the partition, the cooling pipe passes through the outer shell and is connected to an external circulating refrigeration device, a water tank is provided below the partition, a water pump is provided on the left side of the water tank, a water outlet of the water pump is connected to one end of a hose, the hose is plugged into the refrigeration device, and the other end of the hose is connected to a plurality of water distribution pipes, the water distribution pipes are movably provided above the partition, and nozzles are evenly distributed on the inner side of the water distribution pipes, and the nozzles correspond to the positions of the cooling pipes.

[0009] Preferably, a threaded rod is provided above the water distribution pipe, the threaded rod is rotatably connected to the outer shell, one end of the threaded rod is connected to a bidirectional motor, the bidirectional motor is fixedly connected to the outer shell, the outer side of the threaded rod is threadedly connected to a movable block, a limiting rod is provided below the movable block, a slider is slidably provided on the limiting rod, and the water distribution pipe is fixed between the slider and the movable block.

[0010] Preferably, a dust cover is sleeved on the outer side of the limiting rod and the threaded rod, and the dust cover fits tightly with the outer shell and the movable block / slider.

[0011] Preferably, the top surface of the partition is a slope, and the lowest point of the slope is connected to the water tank. A filter plate is obliquely arranged in the water tank, a sludge bin is arranged on the right side of the filter plate, and the sludge bin corresponds to the position of the sewage outlet. A water storage bin is arranged on the left side of the filter plate, and the water storage bin is connected to the water pump pipeline.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] The utility model increases the pressure of the coke oven gas to 4000-6000 Pa (G) by arranging a blower, which is convenient for controlling the suction force in front of the machine, stabilizing the pressure of the gas collecting pipe, and providing a suitable working pressure for subsequent benzene washing. A benzene washing tower is arranged after the blower to fully remove benzene, naphthalene and the like in the coke oven gas, which is conducive to ensuring the yield of benzene and does not affect the stable operation of subsequent equipment due to the precipitation of naphthalene. By arranging the first mist catcher and the second mist catcher, the first mist catcher and the second mist catcher fully remove tar in the gas.

[0014] The utility model provides a compressor after benzene washing, and the compressor pressurizes the coke oven gas to 0.6-0.8 MPa (G), and further performs ammonia washing and desulfurization. Under the pressurized state, the ammonia washing and desulfurization efficiency is higher, the equipment and pipeline are smaller, and the coke oven gas pressurization purification equipment is miniaturized;

[0015] The utility model is provided with a threaded rod, a bidirectional motor, a movable block, a limit rod, a dust cover, a water pump, a hose, a water distribution pipe and a nozzle. When the bidirectional motor works, it drives the movable block to move, moves the nozzle, and at the same time the water pump works to draw water out of the water tank, sends the water to the water distribution pipe through the hose, and then sprays it out from the nozzle to rinse the cooling pipe clean, avoid impurities adhering to the surface of the cooling pipe and affecting the heat exchange efficiency, and fully clean the surface of the cooling pipe. The dust cover can prevent impurities in the coke oven gas from adhering to the surface of the threaded rod and the limit rod and affecting the stability of movement. By providing a water tank, a sewage outlet, a filter plate, a sludge bin and a water storage bin, the flushing water flows from the partition into the water tank for collection, the filter plate filters the sewage, and the impurities fall into the sludge bin for temporary storage. After storing a certain amount, the water is cleaned from the sewage outlet, and the filtered water enters the water storage bin for recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the system composition of the present utility model.

[0017] Figure 2 This is a schematic diagram of the appearance structure of the primary cooler of the present utility model.

[0018] Figure 3 This is a schematic diagram of the internal structure of the primary cooler of the present utility model.

[0019] Figure 4 This is a schematic diagram of the coordination of the bidirectional motor, limit rod, dust cover and water distribution pipe of the utility model.

[0020] Figure 5 For the utility model Figure 4 Enlarged view of point A.

[0021] Figure 6 This is a schematic diagram of the coordination of the water tank, water pump, hose, filter plate, sludge bin and water storage bin of the utility model.

[0022] In the figure: 1. Pre-cooler; 101. Outer shell; 102. Inspection port; 103. Air inlet pipe; 104. Partition; 105. Cooling pipe; 106. Threaded rod; 107. Bidirectional motor; 108. Movable block; 109. Limit rod; 110. Dust cover; 111. Water tank; 112. Sewage outlet; 113. Water pump; 114. Hose; 115. Water distribution pipe; 116. Nozzle; 117. Filter plate; 118. Sludge bin; 119. Water storage tank; 2. First mist collector; 3. Blower; 4. Benzene washing tower; 5. Second mist collector; 6. Compressor; 7. Ammonia washing tower; 8. Desulfurization tower. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0024] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc. should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] See also Figure 1-6The utility model provides an embodiment: a coke oven gas pressurized purification system, comprising a primary cooler 1, the air inlet of the primary cooler 1 is connected to the coke oven gas outlet pipeline, the outlet pipeline of the primary cooler 1 is connected to a first mist catcher 2, the first mist catcher 2 pipeline is connected to a blower 3, the blower 3 pipeline is connected to a benzene washing tower 4, the benzene washing tower 4 pipeline is connected to a second mist catcher 5, the second mist catcher 5 pipeline is connected to a compressor 6, the compressor 6 pipeline is connected to an ammonia washing tower 7, the ammonia washing tower 7 pipeline is connected to a desulfurization tower 8, and the outlet of the desulfurization tower 8 is connected to the user interface.

[0028] Specifically, the first mist collector 2 and the second mist collector 5 are electric tar collectors, which can fully remove tar from the coal gas.

[0029] Specifically, the primary cooler 1 includes a shell 101, a threaded rod 106, a water pump 113 and a filter plate 117. An inspection port 102 is provided on the front of the shell 101. An air inlet pipe 103 is fixedly connected to the left side of the shell 101. A partition 104 is fixedly connected to the inside of the shell 101. A cooling pipe 105 is provided above the partition 104. The cooling pipe 105 passes through the shell 101 and is connected to an external circulating refrigeration device. A water tank 111 is provided below the partition 104. A water pump 113 is provided on the left side of the water tank 111. The water outlet of the water pump 113 is connected to the hose 114. The hose 114 is connected to the refrigeration equipment, and the other end of the hose 114 is connected to multiple water distribution pipes 115. The water distribution pipes 115 are movably arranged above the partition 104. Nozzles 116 are evenly distributed on the inner side of the water distribution pipes 115. The nozzles 116 correspond to the positions of the cooling pipes 105. The water pump 113 works to pump out the water in the water tank 111, and send it to the water distribution pipes 115 through the hose 114, and then spray it out from the nozzles 116 to rinse the cooling pipes 105 clean, so as to prevent impurities from adhering to the surface of the cooling pipes 105 and affecting the heat exchange efficiency, and at the same time play an auxiliary refrigeration role.

[0030] Specifically, a threaded rod 106 is provided above the water distribution pipe 115, and the threaded rod 106 is rotatably connected to the outer shell 101. One end of the threaded rod 106 is connected to a bidirectional motor 107, and the bidirectional motor 107 is fixedly connected to the outer shell 101. The outer side of the threaded rod 106 is threadedly connected to a movable block 108, and a limiting rod 109 is provided below the movable block 108. A slider is slidably provided on the limiting rod 109. The water distribution pipe 115 is fixed between the slider and the movable block 108. When the bidirectional motor 107 works, it drives the movable block 108 to move, moves the nozzle 116, and fully cleans the surface of the cooling pipe 105 as a whole.

[0031] Specifically, a dust cover 110 is sleeved on the outside of the limit rod 109 and the threaded rod 106. The dust cover 110 fits tightly with the outer shell 101 and the movable block 108 / slider. The dust cover 110 can prevent impurities in the coke oven gas from adhering to the surface of the threaded rod 106 and the limit rod 109 and affecting the stability of movement.

[0032] Specifically, the top surface of the partition 104 is a slope, and the lowest point of the slope is connected to the water tank 111. A filter plate 117 is arranged obliquely in the water tank 111. A sludge bin 118 is arranged on the right side of the filter plate 117. The sludge bin 118 corresponds to the position of the sewage outlet 112. A water storage bin 119 is arranged on the left side of the filter plate 117. The water storage bin 119 is connected to the water pump 113 pipeline. The flushing water flows from the partition 104 into the water tank 111 for collection. The filter plate 117 filters the sewage, and impurities fall into the sludge bin 118 for temporary storage. After storing a certain amount, the sludge is cleaned from the sewage outlet 112, and the filtered water enters the water storage bin 119 for recycling.

[0033] Working principle: First, the coke oven gas enters the primary cooler 1 for cooling, and the coke oven gas is initially cooled through the cooling pipe 105. After a period of time, the bidirectional motor 107 works, driving the movable block 108 to move, and the nozzle 116 moves. At the same time, the water pump 113 works to pump out the water in the water tank 111, and sends it to the water distribution pipe 115 through the hose 114, and then sprays it out from the nozzle 116 to rinse the cooling pipe 105 clean, avoiding impurities adhering to the surface of the cooling pipe 105 and affecting the heat exchange efficiency. The surface of the cooling pipe 105 is fully cleaned, and the dust cover 110 can prevent impurities in the coke oven gas from adhering to the surface of the threaded rod 106 and the limit rod 109 and affecting the stability of movement. Then the flushed water flows from the partition 104 into the water tank 111 for collection, the filter plate 117 filters the sewage, and the impurities fall into the sludge bin 118 for temporary storage. After a certain amount of storage The filtered water is cleaned from the sewage outlet 112 and enters the water storage tank 119 for recycling. Then the first mist collector 2 removes the tar in the cooled coke oven gas, and then the blower 3 pressurizes the coke oven gas to 4000~6000Pa(G), which is convenient for controlling the suction in front of the machine, stabilizing the pressure of the gas collecting pipe, and providing a suitable working pressure for the subsequent benzene washing. A benzene washing tower 4 is set after the blower 3 to fully remove benzene, naphthalene, etc. in the coke oven gas, which is conducive to ensuring the yield of benzene and will not affect the stable operation of subsequent equipment due to the precipitation of naphthalene. Then the second mist collector 5 removes the residual tar again, and the compressor 6 pressurizes the coke oven gas to 0.6~0.8MPa(G) for further ammonia washing and desulfurization. Under the pressurized state, the ammonia washing and desulfurization efficiency are higher, the equipment and pipelines are smaller, and the miniaturization of the coke oven gas pressurization purification equipment is realized.

[0034] The above is only an embodiment of the present invention, and common knowledge such as the specific structure and characteristics of the scheme are not described in detail here. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claim involved.

Claims

1. A coke oven gas pressurization purification system, characterized by: The invention comprises a primary cooler (1), wherein the air inlet of the primary cooler (1) is connected to the coke oven gas outlet pipeline, the air outlet pipeline of the primary cooler (1) is connected to a first mist catcher (2), the first mist catcher (2) pipeline is connected to a blower (3), the blower (3) pipeline is connected to a benzene washing tower (4), the benzene washing tower (4) pipeline is connected to a second mist catcher (5), the second mist catcher (5) pipeline is connected to a compressor (6), the compressor (6) pipeline is connected to an ammonia washing tower (7), the ammonia washing tower (7) pipeline is connected to a desulfurization tower (8), and the air outlet of the desulfurization tower (8) is connected to a user interface.

2. A coke oven gas pressurization purification system according to claim 1, characterized in that: The first mist collector (2) and the second mist collector (5) are electric tar collectors.

3. The coke oven gas pressurization purification system according to claim 1, characterized in that: The primary cooler (1) comprises a housing (101), a threaded rod (106), a water pump (113) and a filter plate (117). The front of the housing (101) is provided with an inspection port (102). The left side of the housing (101) is fixedly connected to an air intake pipe (103). The interior of the housing (101) is fixedly connected to a partition (104). A cooling pipe (105) is provided above the partition (104). The cooling pipe (105) passes through the housing (101) and is connected to an external circulating refrigeration device. The partition (104) A water tank (111) is provided below the partition (104), a water pump (113) is provided on the left side of the water tank (111), a water outlet of the water pump (113) is connected to one end of a hose (114), the hose (114) is plugged into a refrigeration device, the other end of the hose (114) is connected to a plurality of water distribution pipes (115), the water distribution pipes (115) are movably provided above the partition (104), and nozzles (116) are evenly distributed on the inner side of the water distribution pipes (115), and the positions of the nozzles (116) and the cooling pipes (105) correspond.

4. A coke oven gas pressurization purification system according to claim 3, characterized in that: A threaded rod (106) is provided above the water distribution pipe (115), the threaded rod (106) is rotatably connected to the housing (101), one end of the threaded rod (106) is connected to a bidirectional motor (107), the bidirectional motor (107) is fixedly connected to the housing (101), the outer side of the threaded rod (106) is threadedly connected to a movable block (108), a limiting rod (109) is provided below the movable block (108), a slider is slidably provided on the limiting rod (109), and the water distribution pipe (115) is fixed between the slider and the movable block (108).

5. A coke oven gas pressurization purification system according to claim 4, characterized in that: The outer sides of the limiting rod (109) and the threaded rod (106) are sleeved with a dust cover (110), and the dust cover (110) is tightly fitted with the housing (101) and the movable block (108) / slider.

6. A coke oven gas pressurization purification system according to claim 3, characterized in that: The top surface of the partition (104) is an inclined surface, and the lowest point of the inclined surface is connected to the water tank (111). A filter plate (117) is arranged obliquely in the water tank (111). A sludge bin (118) is arranged on the right side of the filter plate (117). The sludge bin (118) corresponds to the position of the sewage outlet (112). A water storage bin (119) is arranged on the left side of the filter plate (117). The water storage bin (119) is connected to a water pump (113) pipeline.

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