Coal gas dehydration device

Abstract

The utility model provides a coal gas dehydration device which comprises a coal gas inlet pipeline, a dehydration tower and a coal gas outlet pipeline, the coal gas inlet pipeline is communicated with a coal gas inlet of the dehydration tower, and the coal gas outlet pipeline is communicated with a coal gas outlet of the dehydration tower. A water absorption unit and an extrusion part for extruding water in the water absorption unit are arranged in the dehydration tower, and the water absorption unit is positioned on a circulation path of the coal gas. The structure of the coal gas dehydration device can be simplified, and the water absorption effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal gas dehydration, in particular to a coal gas dehydration device. Background Art

[0002] With the development of the metallurgical or coking industry, the scale of production is getting larger and larger, and the amount of by-product gas is also increasing. The problem of water content in coal gas is becoming more and more prominent. Many companies have found that the water content in coal gas has caused a series of problems. The water in the coal gas will not only cause condensation corrosion in the gas pipeline, but also reduce the calorific value of the coal gas. At the same time, during the combustion of coal gas, water will consume a large amount of latent heat of gasification and sensible heat. Excessive water will cause the burner to flame out. Reducing the water content of coal gas can effectively solve the problem of pipeline corrosion, while increasing the calorific value of coal gas, etc., resulting in a series of energy-saving and consumption-reducing effects.

[0003] At present, the dehydrators most commonly used in the purified coal gas systems of my country's metallurgical or coking industries are mainly baffle type, gravity type and cyclone type.

[0004] (1) Baffle dehydrator. Structure of baffle dehydrator. This type of dehydrator is mostly used in high-pressure blast furnace gas systems. It is installed after the pressure regulating valve group to perform dehydration and dust removal. Its working principle is: when the gas enters along the tangential direction, it passes through the zigzag baffle, and the water droplets are separated from the gas flow under the action of centrifugal force and gravity. Some water droplets directly collide with the baffle and lose kinetic energy and are separated from the gas. The stainless steel plate of the baffle dehydrator is complex in shape and has a low production cost. It is not suitable for crude gas occasions.

[0005] (2) Gravity dehydrator. It uses the reduction of gas flow velocity and change of direction to separate water droplets from gas flow under the action of gravity and inertia. Although the cost of gravity dehydrator is low, the separation effect is poor and cannot achieve the ideal effect.

[0006] (3) Cyclone dehydrator. This type of dehydrator is mostly used in medium and small blast furnaces and is installed after the venturi. After the gas flow enters the cyclone dehydrator, the water droplets collide with the dehydrator wall under the action of centrifugal force, causing the water droplets to lose kinetic energy and separate from the gas flow, thereby achieving the purpose of dust removal and dehydration. The cyclone dehydrator is also a relatively good way to dehydrate gas. It also requires a flushing device when used for dehydrating raw gas.

[0007] In summary, the above-mentioned various coal gas dehydration devices have certain limitations or problems in use. Therefore, it is necessary to develop a new coal gas dehydration device to simplify the structure of the coal gas dehydration device and improve the water absorption effect. Utility Model Content

[0008] The utility model aims to provide a coal gas dehydration device to solve the problems of complex structure and poor water absorption effect of the existing coal gas dehydration device.

[0009] In order to solve the above technical problems, the utility model provides a coal gas dehydration device, including a coal gas inlet pipe, a dehydration tower and a coal gas outlet pipe, the coal gas inlet pipe is connected to the coal gas inlet of the dehydration tower, the coal gas outlet pipe is connected to the coal gas outlet of the dehydration tower, a water absorption unit and an extrusion piece for squeezing out water in the water absorption unit are arranged in the dehydration tower, and the water absorption unit is located on the flow path of the coal gas.

[0010] Optionally, the extrusion member is arranged above the water absorption unit, and the extrusion member can be raised and lowered relative to the dehydration tower.

[0011] Optionally, the extrusion component includes a lifting rope, an extrusion plate and a lifter whose output end can be raised and lowered, and the lifter is arranged on the dehydration tower, and one end of the lifting rope is connected to the output end of the lifter and the other end lifts the extrusion plate.

[0012] Optionally, a roller support is provided on the extrusion plate, a roller is provided on the roller support, and the roller is rollingly connected to the side wall of the dehydration tower.

[0013] Optionally, the water absorbing unit includes a water absorbing member and a supporting member arranged below the water absorbing member.

[0014] Optionally, there are multiple water absorption units, which are arranged in sequence from bottom to top along the dehydration tower, and the upper support members of two adjacent water absorption units are suspended by connecting ropes to lift the lower support members, and the support members at the bottom layer are fixed to the inner wall of the dehydration tower.

[0015] Optionally, the thickness of the water absorbing parts of each of the water absorbing units increases sequentially from bottom to top.

[0016] Optionally, the density of the water absorbing parts of each of the water absorbing units gradually decreases from bottom to top.

[0017] Optionally, the air permeability and porosity of the water absorbing parts of each of the water absorbing units gradually decrease from bottom to top.

[0018] Optionally, there are two gas dehydration devices, the gas inlet pipes of the two gas dehydration devices are both connected to an external gas source, and the gas outlet pipes of the two gas dehydration devices are both connected to a gas return network.

[0019] The utility model provides a gas dehydration device, which has the following beneficial effects:

[0020] Since the coal gas inlet pipe is connected with the coal gas inlet of the dehydration tower, the coal gas outlet pipe is connected with the coal gas outlet of the dehydration tower, and the water absorption unit is located on the flow path of the coal gas, the water absorption unit can absorb the water in the coal gas flowing into the dehydration tower from the coal gas inlet of the dehydration tower, and the dehydrated coal gas flows out from the coal gas outlet of the dehydration tower. Since the water absorption unit is used for dehydration, the dehydration effect is good and the structure is relatively simple. Since an extrusion piece for squeezing out the water in the water absorption unit is provided in the dehydration tower, the water in the water absorption unit can be used again for coal gas dehydration after being squeezed out, thereby improving the utilization rate of the water absorption unit, which is more economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an elevation view of the gas dehydration device in the embodiment of the utility model;

[0022] Figure 2 is a top view of the gas dehydration device in the embodiment of the utility model;

[0023] Figure 3 It is a side view of the gas dehydration device in the embodiment of the utility model;

[0024] Figure 4 It is a vertical view of a dehydration tower in a gas dehydration device in an embodiment of the utility model;

[0025] Figure 5 It is a vertical view of the dehydration tower after the water absorption unit in the dehydration tower of the coal gas dehydration device in the embodiment of the utility model is compressed;

[0026] Figure 6 It is a schematic plan view of a water absorption unit in a dehydration tower in a gas dehydration device in an embodiment of the utility model;

[0027] Figure 7 It is a partial structural schematic diagram of a dehydration tower in a gas dehydration device in an embodiment of the utility model.

[0028] Description of reference numerals:

[0029] 110-gas inlet pipeline; 120-dehydration tower; 130-gas outlet pipeline; 140-water absorption unit; 141-water absorption member; 142-support member; 143-connecting rope; 150-extrusion member; 151-lifting rope; 152-extrusion plate; 153-lifter; 154-roller support; 155-roller; 160-manhole for inspection; 170-drain hole; 180-drainage pool; 190-air flow distributor; 200-gas sealing device; 210-switch valve. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , Figure 1 This is a vertical view of the gas dehydration device in the embodiment of the utility model. Figure 2 This is a top view of the gas dehydration device in the embodiment of the utility model. Figure 3 This is a side view of the gas dehydration device in the embodiment of the utility model. Figure 4 It is a vertical view of the dehydration tower 120 in the gas dehydration device in the embodiment of the utility model. Figure 5 It is a vertical view of the dehydration tower 120 after the water absorption unit 140 in the dehydration tower 120 in the coal gas dehydration device in the embodiment of the utility model is compressed. Figure 6 1 is a schematic plan view of a water absorption unit 140 in a dehydration tower 120 in a gas dehydration device in an embodiment of the utility model. Figure 7 It is a schematic diagram of the partial structure of a dehydration tower 120 in a gas dehydration device in an embodiment of the utility model. This embodiment provides a gas dehydration device, including a gas inlet pipe 110, a dehydration tower 120 and a gas outlet pipe 130. The gas inlet pipe 110 is connected to the gas inlet of the dehydration tower 120, and the gas outlet pipe 130 is connected to the gas outlet of the dehydration tower 120. A water absorption unit 140 and an extrusion piece 150 for squeezing out water in the water absorption unit 140 are provided in the dehydration tower 120. The water absorption unit 140 is located on the flow path of the gas.

[0037] Since the gas inlet pipe 110 is connected to the gas inlet of the dehydration tower 120, the gas outlet pipe 130 is connected to the gas outlet of the dehydration tower 120, and the water absorption unit 140 is located on the flow path of the gas, the water absorption unit 140 can absorb the water in the gas flowing into the dehydration tower 120 from the gas inlet of the dehydration tower 120, and the dehydrated gas flows out from the gas outlet of the dehydration tower 120. Since the water absorption unit 140 is used for dehydration, the dehydration effect is good and the structure is relatively simple; since the dehydration tower 120 is provided with an extrusion piece 150 for squeezing out the water in the water absorption unit 140, the water in the water absorption unit 140 can be used again for gas dehydration after being squeezed out, thereby improving the utilization rate of the water absorption unit 140, which is more economical.

[0038] Preferably, the extrusion member 150 is disposed above the water absorption unit 140, and the extrusion member 150 can be raised and lowered relative to the dehydration tower 120. Therefore, when the extrusion member 150 moves downward, the water absorption unit 140 can be squeezed to squeeze out the water in the water absorption unit 140.

[0039] Specifically, refer to Figure 1 and Figure 4 The extrusion member 150 includes a lifting rope 151, an extrusion plate 152 and a lifter 153 whose output end can be raised and lowered. The lifter 153 is arranged on the dehydration tower 120. One end of the lifting rope 151 is connected to the output end of the lifter 153 and the other end lifts the extrusion plate 152.

[0040] In this embodiment, the lifter 153 is a winch. The extrusion plate 152 is a porous plate.

[0041] Preferably, the squeezing plate 152 is provided with a roller support 154, the roller support 154 is provided with a roller 155, and the roller 155 is rollingly connected to the side wall of the dehydration tower 120. In this way, the stability of the movement of the squeezing plate 152 can be improved, so that the squeezing plate 152 can act evenly on the water absorption unit 140, and the water squeezing effect of the water absorption unit 140 is improved.

[0042] The roller 155 is preferably a non-metallic roller 155 .

[0043] The water absorbing unit 140 includes a water absorbing member 141 and a support member 142 arranged below the water absorbing member 141. Since the support member 142 is arranged below the water absorbing unit 140, when the extrusion member 150 can move downward to extrude the water absorbing unit 140, the support member 142 can cooperate with the extrusion member 150 to improve the effect of squeezing out water, and at the same time protect the water absorbing unit 140 to increase the service life of the water absorbing unit 140.

[0044] refer to Figure 4 There are multiple water absorption units 140, which are arranged in sequence from bottom to top along the dehydration tower 120. The upper support members 142 of two adjacent water absorption units 140 are suspended by connecting ropes to lift the lower support members 142, and the bottom support members 142 are fixed to the inner wall of the dehydration tower 120.

[0045] The water absorbing member 141 is a dehydrated sponge.

[0046] Preferably, the thickness of the water absorbing member 141 of each water absorbing unit 140 increases from bottom to top. In this way, it is convenient to absorb water better, such as the lowest layer and the second lowest layer of sponge are set to about 20 cm, the middle layer of two to three layers is set to about 25 cm, and the top layer is set to about 30 cm.

[0047] Preferably, the density of the water absorbing parts 141 of each water absorbing unit 140 gradually decreases from bottom to top. Water absorbing sponges are divided into high-density sponges, medium-density sponges and low-density sponges. Among them, low-density sponges have the best water absorption performance and can be placed in the highest layers to play a role in water absorption and better balance the overall water absorption performance. Medium-density sponges are placed in the middle layers, and high-density sponges have slightly poor water absorption performance and can be placed in the lowest layers. In this way, the overall water absorption performance of the water absorption tower can be improved, so that the sponge layer at the lower sponge layer is not easily saturated with water, while the sponge at the upper layer is far from reaching the state of adsorption saturation.

[0048] Preferably, the air permeability and porosity of the water absorbing parts 141 of each water absorbing unit 140 gradually decrease from bottom to top. In this way, it is necessary to reduce the system operation assistance as much as possible, and the lower sponge layer uses sponges with good air permeability and large porosity, and the upper layer only uses sponges with poor air permeability and small porosity, so as to achieve a reasonable state of good overall water absorption performance and relatively small equipment assistance, extend the service life of the sponge, reduce the frequency of squeezing and regeneration operations, and achieve a better operation effect.

[0049] In addition, the changes in thickness, density, air permeability and porosity of the water absorbing parts 141 of each water absorbing unit 140 from bottom to top comprehensively affect the dehydration performance of the water absorbing unit 140, which can improve the system operation assistance, water absorption effect, and prevent the sponge from floating.

[0050] refer to Figure 6 The dehydration tower 120 is provided with a plurality of inspection manholes 160 , and the water absorbent member 141 is cut into a plurality of water absorbent blocks from the connection between the lifting rope 151 and the support member 142 and the connection between the connecting rope and the support member 142 , and the width of the plurality of water absorbent blocks is smaller than the width of the inspection manhole 160 .

[0051] refer to Figure 1 and Figure 4 A drainage hole 170 is provided at the bottom of the dehydration tower 120 .

[0052] The coal gas dehydration device further includes a drainage pool 180, and the drainage pool 180 is connected to the drainage.

[0053] The coal gas dehydration device further comprises a gas flow distributor 190 for distributing the coal gas flow direction, improving the coal gas flow uniformity, improving the dehydration efficiency and reducing the gas assist.

[0054] The gas dehydration device further includes a gas sealing device 200 for preventing negative pressure from forming in the dehydration tower 120. Specifically, nitrogen is filled into the gas sealing device 200 to keep the gas sealing device 200 filled with nitrogen, thereby preventing dehydration from forming negative pressure and sucking in air.

[0055] refer to Figure 1The gas inlet pipe 110 and the gas outlet pipe 130 are both provided with a switch valve 210 .

[0056] refer to Figure 1 The number of the gas dehydration devices is two, the gas inlet pipes 110 of the two gas dehydration devices are both connected to the external gas source, and the gas outlet pipes 130 of the two gas dehydration devices are both connected to the gas return network. In this way, the system adopts a two-way parallel mode, and according to the saturation of the water-absorbing sponge, it switches to absorb water in turn, and squeezes and regenerates the saturated water-absorbing sponge to restore the water absorption capacity.

[0057] refer to Figure 2 and Figure 3 The coal gas inlet of the dehydration tower 120 and the coal gas outlet of the dehydration tower 120 are both located on the side wall of the dehydration tower 120 .

[0058] This embodiment also provides a coal gas dehydration method using the above-mentioned coal gas dehydration device to dehydrate coal gas, comprising:

[0059] The gas entering the dehydration tower 120 from the gas inlet pipe 110 through the gas inlet of the dehydration tower 120 is dehydrated by a water absorption unit 140 disposed in the dehydration tower 120 and located on the flow path of the gas, and the dehydrated gas is discharged from the dehydration tower 120 through the gas outlet of the dehydration tower 120 and the gas outlet pipe 130;

[0060] The water in the water absorption unit 140 is squeezed out by the pressing member 150 .

[0061] Since the water absorption unit 140 disposed in the dehydration tower 120 and located on the flow path of the coal gas, the coal gas entering the dehydration tower 120 from the coal gas inlet pipe 110 through the coal gas inlet of the dehydration tower 120 is dehydrated, and the dehydrated coal gas is discharged from the dehydration tower 120 through the coal gas outlet pipe 130 of the dehydration tower 120. Therefore, the water in the coal gas flowing into the dehydration tower 120 from the coal gas inlet of the dehydration tower 120 can be absorbed by the water absorption unit 140, and the dehydrated coal gas is discharged from the coal gas outlet of the dehydration tower 120. Since the water absorption unit 140 is used for dehydration, the dehydration effect is good and the structure is relatively simple. Since the dehydration tower 120 is provided with an extrusion piece 150 for squeezing out the water in the water absorption unit 140, the water in the water absorption unit 140 can be used again for coal gas dehydration after being squeezed out, thereby improving the utilization rate of the water absorption unit 140, which is more economical.

[0062] Preferably, the lifting rope 151 is driven to rise and fall by the stepping drive of the lifting device 153. Specifically, by controlling the synchronous action of the motor of the lifting device 153, a pause is performed every time a small distance is moved up and down, and the movement distance of each steel rope is checked to be consistent, and the inconsistent manual control is adjusted. If there is a motor failure, it is necessary to enter the maintenance mode, switch the gas to the other side of the equipment, and repair the motor of the failed lifting device 153; through multiple steps of "step-by-step" action, the lifting rope 151 is stretched up and down, so as to control the extrusion member 150 and the water absorption unit 140 to maintain horizontality and stability.

[0063] When the water absorption performance of the equipment decreases significantly, and a good effect cannot be achieved after multiple squeezing and regeneration, considering that the water absorption performance of the sponge cannot meet the use requirements, it is necessary to remove and replace each layer of sponge. The replacement process of the water absorption unit 140 is as follows:

[0064] First, after the current layer is placed securely, the connection between the connecting rope and the previous layer can be loosened, and the water absorbing unit 140 and the extrusion member 150 of the previous layer and above can be lifted to facilitate the disassembly of the water absorbing member 141 of the current layer;

[0065] Next, the water absorbing member 141 is disassembled and assembled by sequentially operating each layer.

[0066] The coal gas dehydration process in this embodiment is as follows:

[0067] In the first step, the gas is tested for temperature, pressure, and water content;

[0068] In the second step, the tested gas enters the dehydration tower 120 through the gas inlet pipe 110;

[0069] In the third step, in the dehydration tower 120, the coal gas passes through the air flow distributor 190 and enters the water absorbing member 141 to complete the adsorption of water in the coal gas;

[0070] In the fourth step, the coal gas, after being dehydrated by the water absorbing member 141, passes through the porous extrusion member 150, passes through the coal gas outlet pipe 130, and returns to the coal gas return network after being subjected to temperature, pressure, and water content control;

[0071] The fifth step is to activate the second gas dehydration device when the water absorbing component 141 of the first gas dehydration device is saturated with water. After the second gas dehydration device has purged and replaced the gas and passed the test, open the valve on the gas inlet pipe 110 and the valve on the gas outlet pipe 130, and the gas enters the dehydration tower 120. After repeating the process of the first gas dehydration device, the gas returns to the gas return network.

[0072] The process of regeneration recovery extrusion operation of the gas dehydration device is as follows:

[0073] The first step is to close the valve of the gas inlet pipeline 110 and the valve of the gas outlet pipeline 130;

[0074] The second step is to fill the gas sealing device 200 with nitrogen to prevent dehydration from forming a negative pressure and inhaling air;

[0075] The third step is to operate the lifting rope 151 through the lifting device 153, adjust the length of the lifting rope 151 in the dehydration tower 120, and slowly lower the extrusion member 150, so that the extrusion member 150 squeezes the water absorbing member 141, and the water in the water absorbing member 141 is squeezed out and flows to the bottom of the dehydration tower 120 through the air flow distributor 190, and is discharged from the dehydration tower 120 through the drain port at the bottom.

[0076] The above description is only a description of the preferred embodiment of the utility model, and is not any limitation on the scope of the utility model. Any changes and modifications made by ordinary technicians in the field of the utility model based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A gas dehydration device, characterized in that: It includes a gas inlet pipeline, a dehydration tower and a gas outlet pipeline. The gas inlet pipeline is connected to the gas inlet of the dehydration tower, and the gas outlet pipeline is connected to the gas outlet of the dehydration tower. A water absorption unit and an extrusion piece for squeezing out water in the water absorption unit are arranged in the dehydration tower. The water absorption unit is located on the flow path of the gas.

2. The coal gas dehydration device according to claim 1, characterized in that: The extrusion member is arranged above the water absorption unit, and the extrusion member can be lifted up and down relative to the dehydration tower.

3. The coal gas dehydration device according to claim 2, characterized in that: The extrusion member comprises a lifting rope, an extrusion plate and a lifter whose output end can be raised and lowered. The lifter is arranged on the dehydration tower. One end of the lifting rope is connected to the output end of the lifter and the other end lifts the extrusion plate.

4. The coal gas dehydration device according to claim 3, characterized in that: The extrusion plate is provided with a roller support, the roller support is provided with a roller, and the roller is rollingly connected to the side wall of the dehydration tower.

5. The coal gas dehydration device according to claim 1, characterized in that: The water absorbing unit includes a water absorbing member and a supporting member disposed below the water absorbing member.

6. The coal gas dehydration device according to claim 5, characterized in that: There are multiple water absorption units, which are arranged in sequence from bottom to top along the dehydration tower. The upper support members of two adjacent water absorption units are suspended by connecting ropes to the lower support members, and the support members at the bottom are fixed on the inner wall of the dehydration tower.

7. The coal gas dehydration device according to claim 6, characterized in that: The thickness of the water absorbing parts of the water absorbing units increases from bottom to top.

8. The coal gas dehydration device according to claim 6, characterized in that: The density of the water absorbing elements of the water absorbing units gradually decreases from bottom to top.

9. The coal gas dehydration device according to claim 6, characterized in that: The air permeability and porosity of the water-absorbing elements of the water-absorbing units gradually decrease from bottom to top.

10. The coal gas dehydration device according to claim 1, characterized in that: There are two gas dehydration devices, the gas inlet pipes of the two gas dehydration devices are both connected to the external gas source, and the gas outlet pipes of the two gas dehydration devices are both connected to the gas return network.

Images