Brown coal treatment and raw gas cooling coupling system

Abstract

The utility model discloses a lignite treatment and raw gas cooling coupling system. The lignite treatment and raw coke oven gas cooling coupling system comprises a first-stage dry distillation furnace, a pressing forming machine, a second-stage dry distillation furnace, a coal gas cooling device, a sedimentation tank, a water storage tank and a water cooling device, the first-stage dry distillation furnace is used for upgrading lignite, the pressing forming machine is used for pressing the upgraded lignite into briquette coal, the second-stage dry distillation furnace is used for dry distillation of the briquette coal, and the coal gas cooling device is used for cooling the briquette coal. The gas cooling device is used for cooling raw gas, the sedimentation tank is used for receiving cooling water used by the gas cooling device and precipitating impurities in the cooling water, the reservoir is used for storing the cooling water, the cooling water in the sedimentation tank is fed into the reservoir, and the cooling water in the reservoir is fed into the primary dry distillation furnace for cooling; the cooling water subjected to heat exchange of the primary dry distillation furnace is fed into the water cooling device for cooling, the water cooling device is used for cooling the cooling water, and the cooled cooling water is fed into the coal gas cooling device. The lignite treatment and raw coke oven gas cooling coupling system can reduce the consumption of cooling water.

Description

Technical Field

[0001] The utility model relates to the technical fields of lignite treatment and raw coal gas treatment, in particular to a coupled system for lignite treatment and raw coal gas cooling. Background Art

[0002] During the lignite treatment process, a large amount of water is required for cooling the treated lignite. Raw coal gas is generated during the lignite treatment process. The raw coal gas can be deeply processed to obtain commodities with higher value. However, when the raw coal gas is separated from the lignite treatment, its temperature is high. It needs to be cooled and purified first before deep processing. At the same time, it also contains impurities such as dust. A large amount of water is also required for cooling when cooling the raw coal gas. The two cooling processes increase the consumption of cooling water. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a coupled system for lignite treatment and raw coal gas cooling that reduces the consumption of cooling water.

[0004] To solve the above problems, the utility model provides a coupled system for lignite treatment and raw coal gas cooling. The coupled system for lignite treatment and raw coal gas cooling includes a primary retort furnace, a briquetting machine, a secondary retort furnace, a gas cooling device, a sedimentation tank, a reservoir, and a water cooling device. The primary retort furnace is used for upgrading lignite. The briquetting machine is used for pressing the upgraded lignite into briquettes. The secondary retort furnace is used for retorting the briquettes. The gas cooling device is used for cooling the raw coal gas generated by the secondary retort furnace and purifying the raw coal gas. The sedimentation tank is used for receiving the cooling water used by the gas cooling device and precipitating the impurities in the cooling water. The reservoir is used for storing the cooling water. The cooling water in the sedimentation tank is sent into the reservoir. The cooling water in the reservoir is sent into the primary retort furnace for cooling. The cooling water after heat exchange in the primary retort furnace is sent into the water cooling device for cooling. The water cooling device is used for cooling the cooling water. The cooled cooling water is sent into the gas cooling device.

[0005] Further, the sedimentation tank is provided with a first partition board and a second partition board. The first partition board and the second partition board divide the sedimentation tank into a sedimentation chamber, a buffer chamber, and a clear water chamber that are sequentially communicated. The sedimentation tank is provided with a water inlet and a water outlet. The water inlet is communicated with the sedimentation chamber. The water outlet is communicated with the clear water chamber.

[0006] Further, the first partition board is L-shaped. A baffle is installed on the second partition board. The baffle is inclined. One end of the baffle close to the first partition board is lower than the end of the baffle connected to the second partition board. The baffle and the first partition board partially overlap in the vertical direction.

[0007] Further, a filter cotton is arranged between the baffle and the first partition board.

[0008] Further, the primary retort furnace includes a furnace body and a coal cooler. The furnace body has a preheating zone, a drying zone, and a cooling zone. The coal cooler is arranged in the cooling zone, and the coal cooler is connected to a reservoir and an air cooling tower through pipelines.

[0009] Further, the coal gas cooling device includes a cooling tower, a diversion hood, a buffer plate, and an atomizing sprayer. The cooling tower has a cooling chamber, an air inlet, an air outlet, a drain outlet, and a slag discharge port. The air inlet, the air outlet, and the slag discharge port are communicated with the cooling chamber. The diversion hood is arranged in the cooling chamber and is located below the air inlet. The diversion hood is used for diverting the coal gas to make the coal gas evenly distributed in the cooling chamber. The buffer plate is arranged in the cooling chamber and is located below the diversion hood. The buffer plate is used for slowing down the flow rate of the coal gas. The atomizing sprayer is installed in the cooling chamber. The atomizing sprayer is used for spraying atomized cooling water. The air outlet is used for discharging the cooled coal gas. The slag discharge port is used for discharging the precipitated dust. A valve is arranged at the slag discharge port. The drain outlet is used for discharging the cooling water containing impurities.

[0010] Further, ventilation holes are arranged on the diversion hood.

[0011] Further, a plurality of buffer plates are provided, and the plurality of buffer plates are arranged in sequence.

[0012] Further, the buffer plate has ventilation holes, and a condensation net is arranged on the buffer plate at the lowermost layer.

[0013] Further, the atomizing sprayer includes an annular pipeline and atomizing nozzles arranged on the annular pipeline. The annular pipeline is installed on the inner wall of the cooling tower.

[0014] In the coupled system for lignite treatment and raw coal gas cooling of the present utility model, the cooling water first cools the raw coal gas, and then uses the cooling water to cool the lignite in the primary retort furnace. At the same time, the cooling water is cooled by the water cooling device and then circulated back to the coal gas cooling device to cool the raw coal gas. After being used multiple times and then recycled, the usage amount of the cooling water is reduced. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of a preferred embodiment of the coupled system for lignite treatment and raw coal gas cooling of the present utility model.

[0016] Figure 2 is a schematic structural diagram of the primary retort furnace.

[0017] Figure 3 is a schematic structural diagram of the coal gas cooling device.

[0018] Figure 4 is a cross-sectional view of the coal gas cooling device.

[0019] Figure 5 It is a schematic structural diagram of a flow dividing cover.

[0020] Figure 6 It is a schematic structural diagram of a sedimentation tank.

[0021] The meanings of the reference numerals in the drawings are as follows:

[0022] Primary retort furnace 1, furnace body 11, preheating zone 111, drying zone 112, cooling zone 113, coal cooler 12, briquetting machine 2, secondary retort furnace 3, gas cooling device 4, sedimentation tank 5, sedimentation chamber 501, buffer chamber 502, clear water chamber 503, first partition 51, second partition 52, water inlet 53, water outlet 54, baffle 55, filter cotton 56, water storage tank 6, water cooling device 7, cooling tower 71, cooling chamber 711, air inlet 712, air outlet 713, drain outlet 714, slag discharge port 715, flow dividing cover 72, vent hole 721, buffer plate 73, atomizing sprayer 74, annular pipe 741, atomizing nozzle 742, connecting block 743, connecting rod 75, fixing column 751, condensation net 76. Specific implementation manners

[0023] The present invention will be further described below with reference to the drawings.

[0024] As Figure 1 shown, a preferred implementation manner of the lignite treatment and raw gas cooling coupling system of the present invention includes a primary retort furnace 1, a briquetting machine 2, a secondary retort furnace 3, a gas cooling device 4, a sedimentation tank 5, a water storage tank 6 and a water cooling device 7. The primary retort furnace 1 is used for upgrading lignite, that is, separating the moisture and crystal water in the lignite. The briquetting machine 2 is used for briquetting the upgraded lignite into briquettes. The secondary retort furnace 3 is used for retorting the briquettes. At the same time, the secondary retort furnace 3 also generates raw gas during the retorting process. The generated raw gas is sent to the gas cooling device 4. The gas cooling device 4 uses cooling water to cool the raw gas generated by the secondary retort furnace 3, and at the same time purifies the raw gas, that is, precipitates the impurities in the raw gas. The cooling water after cooling the raw gas is discharged from the gas cooling device 4 and sent to the sedimentation tank 5. The sedimentation tank 5 is used for precipitating the impurities in the cooling water. The cooling water after precipitation is sent to the water storage tank 6. The water storage tank 6 is used for storing cooling water. The cooling water in the water storage tank 6 is sent into the primary retort furnace 1. The cooling water after heat exchange in the primary retort furnace 1 is sent to the water cooling device 7 for cooling. The water cooling device 7 is used for cooling the cooling water. The cooled cooling water is sent into the gas cooling device 4. After the cooling water is cooled by the water cooling device 7, it is sent to the gas cooling device 4 to cool the raw gas, then enters the sedimentation tank 5 for precipitation, then enters the water storage tank 6 after precipitation, and then enters the primary retort furnace 1 to cool the lignite, and finally enters the water cooling device 7 again to complete the cycle. After being recycled multiple times, the usage amount of the cooling water is reduced.

[0025] As Figure 2 shown, the primary retort furnace 1 includes a furnace body 11 and a coal cooler 12. The furnace body 11 has a preheating zone 111, a drying zone 112, and a cooling zone 113, which are distributed in sequence from top to bottom. The coal cooler 12 is arranged in the cooling zone 113. The coal cooler 12 adopts an existing heat exchange device and cools lignite by an indirect cooling method, cooling the lignite to ≤110°C. The coal cooler 12 is connected to a water storage tank 6 and a water cooling device 7 through pipelines, facilitating the feeding of water in the water storage tank 6 into the coal cooler 12, and at the same time facilitating the entry of the cooled water after heat exchange into the water cooling device 7.

[0026] As Figures 3 to 5As shown, the cooling tower 71 of the gas cooling device 4 has a cooling chamber 711, an air inlet 712, an air outlet 713, a drain outlet 714, and a slag discharge port 715. The air inlet 712, the air outlet 713, the drain outlet 714, and the slag discharge port 715 communicate with the cooling chamber 711. The air inlet 712 is located at the upper end of the cooling tower 71, and the raw gas enters the cooling chamber 711 through the air inlet 712. The shunt cover 72 is arranged in the cooling chamber 711. The shunt cover 72 is located below the air inlet 712. The shunt cover 72 is used to shunt the raw gas so that the raw gas is evenly distributed in the cooling chamber 711, ensuring that the raw gas can be sufficiently dispersed in the cooling chamber 711 instead of forming a fluid beam. The buffer plate 73 is located in the cooling chamber 711. The buffer plate 73 is located below the shunt cover. The buffer plate 73 is used to slow down the flow rate of the raw gas. There are multiple buffer plates 73, and the multiple buffer plates 73 are arranged in sequence from top to bottom to slow down the speed of the raw gas multiple times. Each buffer plate 73 is provided with ventilation holes 721. The ventilation holes 721 can allow the raw gas to pass through the buffer plate 73 while also slowing down the flow rate of the raw gas. A condensation net 76 is arranged on the buffer plate 73 at the lowest layer. The condensation net 76 is used to condense the atomized cooling water, reduce the moisture in the raw gas, and the condensed water droplets fall to the bottom of the cooling tower 71. The condensation net 76 is composed of heat-resistant metal wires and has the same structure as a steel wool ball. In other embodiments, it can also be formed by fixing multiple layers of wire meshes, and adjacent wire meshes are arranged in a staggered manner, or it can also be a sponge structure made of other heat-resistant materials. The atomizing sprayer 74 is installed in the cooling chamber 711. The atomizing sprayer 74 is located at the upper end of the cooling chamber 711 to extend the contact time between the atomized cooling water and the raw gas. The slag discharge port 715 is located in the middle of the lower end of the cooling tower 71. The slag discharge port 715 is used to discharge the precipitated dust, and a valve is arranged at the slag discharge port 715 to discharge the dust when needed. The drain outlet 714 and the air outlet 713 are both located on the side wall of the lower end of the cooling tower 71. The drain outlet 714 is used to discharge the heat-exchanged cooling water and send it into the sedimentation tank 5. The air outlet 713 is used to discharge the raw gas after cooling and dust removal. The lower end of the cooling tower 71 is conical, which is convenient for collecting precipitated dust and other impurities, allowing the impurities to deposit in the conical part. Since not all impurities can precipitate, the cooling water discharged into the sedimentation tank 5 will also contain a certain amount of impurities. An observation window (not shown in the figure) is arranged on the cooling tower 71 to facilitate observing whether the condensation net 76 is blocked. An atomizing sprayer 74 is also arranged in the middle of the cooling tower 71. The atomizing sprayer 74 is located between the buffer plates 73 and is used to assist in cooling the raw gas to ensure the cooling effect. In other embodiments, multiple atomizing sprayers 74 for assistance can also be arranged, or the atomizing sprayer 74 can not be arranged according to requirements.

[0027] The shunt hood 72 is fixed to the inner wall of the cooling tower 71 through a connecting rod 75; specifically, the shunt hood 72 is provided with mounting holes, there are multiple connecting rods 75, and the lower end of each connecting rod 75 is connected to a fixing column 751, and the fixing column 751 is installed in the mounting hole, so as to realize the installation of the shunt hood 72 on the connecting rod 75, and the connecting rod 75 is welded and fixed on the cooling tower 71. The shunt hood 72 is provided with ventilation holes 721 to ensure that raw coal gas also flows directly below the shunt hood 72, that is, to completely disperse the raw coal gas at the upper end of the cooling chamber 711.

[0028] The atomizing sprayer 74 includes an annular pipe 741 and multiple atomizing nozzles 742. The multiple atomizing nozzles 742 are installed on the annular pipe 741. A plurality of connecting blocks 743 are welded on the inner wall of the cooling tower 71, and the annular pipe 741 is welded on the connecting blocks 743. The connecting blocks 743 are evenly distributed on the cooling tower 71 with the center of the annular pipe 741 as the base point.

[0029] The high-temperature raw coal gas enters the cooling chamber 711 through the air inlet. Under the action of the shunt hood 72, the raw coal gas is evenly dispersed at the upper end of the cooling chamber 711. At the same time, the atomizing nozzles 742 spray cooling water, and the atomized cooling water contacts the raw coal gas to cool the raw coal gas. At the same time, the dust is easily incorporated into the atomized water droplets when contacting the atomized cooling water, and the dust in the raw coal gas can be deposited better than the existing way of spraying water flow. Using the atomizing sprayer 74 to spray cooling water can reduce the water consumption. At the same time, a buffer plate 73 is provided to slow down the flow rate of the raw coal gas, ensure sufficient contact between the water mist and the raw coal gas, and ensure the cooling effect; at the same time, at the air inlet shunt hood 72, the raw coal gas is dispersed so that the raw coal gas is evenly distributed in the cooling chamber 711, so as to ensure that all the raw coal gas can be effectively cooled and avoid uneven cooling of the raw coal gas.

[0030] As Figure 6 shown, the sedimentation tank 5 is provided with a first partition 51 and a second partition 52. The first partition 51 and the second partition 52 divide the sedimentation tank 5 into a sedimentation chamber 501, a buffer chamber 502 and a clear water chamber 503 that are connected in sequence. The sedimentation tank 5 is provided with a water inlet 53 and a water outlet 54. The water inlet 53 is communicated with the sedimentation chamber 501. The water inlet 53 is connected to the gas cooling device 4 through a pipeline. The water outlet 54 is communicated with the clear water chamber 503. The water outlet 54 is connected to the water storage tank 6 through a pipeline. The impurities in the cooling water precipitate in the sedimentation chamber 501, and then further precipitate in the buffer chamber 502. Finally, the cooling water entering the clear water chamber 503 has almost no impurities, which prolongs the service life of the coal cooler 12 and each pipeline.

[0031] The first partition 51 is L-shaped, and a baffle 55 is installed on the second partition 52. The baffle 55 is tilted, and the end of the baffle 55 close to the first partition 51 is lower than the end of the baffle 55 connected to the second partition 52. The baffle 55 partially overlaps with the first partition 51 in the vertical direction, so that even if impurities enter the buffer zone, they will be blocked by the baffle 55 first, allowing the impurities to fall back on the first partition 51, so that the impurities can be better precipitated in the buffer zone. A filter cotton 56 is arranged between the baffle 55 and the first partition 51 to prevent impurities from entering the clean water chamber 503 as much as possible. The filter cotton 56 can ensure the filtering effect by setting different quantities. In this embodiment, two filter cottons 56 are used, and in other embodiments, they can be increased or decreased according to needs. At the same time, the filtering effect can also be ensured by changing the thickness of the filter cotton 56.

[0032] After cooling from the water cooling device 7, the cooling water is sent to the atomizing sprayer 74 in the gas cooling device 4 to cool the raw gas and remove impurities in the raw gas. The cooling water after cooling the raw gas enters the sedimentation tank 5 for sedimentation, and the remaining impurities in the cooling water are precipitated, and then enters the water reservoir 6. The water reservoir 6 supplies the cooling water to the primary retorting furnace 1, and the lignite is cooled by the coal cooler 12, and finally returns to the water cooling device 7 to complete the cycle. By utilizing the temperature difference of the cooling object, the cooling water is recycled after multiple uses, thereby reducing the amount of cooling water used.

[0033] The above are only implementation methods of the present utility model, and are not intended to limit the patent scope of the present utility model. Any equivalent structure made using the contents of the specification and drawings of the present utility model, directly or indirectly used in other related technical fields, are also within the patent protection scope of the present utility model.

Claims

1. A lignite treatment and raw coal gas cooling coupling system, characterized in that: It includes a primary retorting furnace, a briquetting machine, a secondary retorting furnace, a gas cooling device, a sedimentation tank, a reservoir, and a water cooling device. The primary retorting furnace is used for upgrading lignite. The briquetting machine is used for pressing the upgraded lignite into briquettes. The secondary retorting furnace is used for retorting the briquettes. The gas cooling device is used for cooling the raw gas generated by the secondary retorting furnace and purifying the raw gas. The sedimentation tank is used for receiving the cooling water used by the gas cooling device and precipitating the impurities in the cooling water. The reservoir is used for storing the cooling water. The cooling water in the sedimentation tank is sent into the reservoir. The cooling water in the reservoir is sent into the primary retorting furnace for cooling. The cooling water after heat exchange in the primary retorting furnace is sent into the water cooling device for cooling. The water cooling device is used for cooling the cooling water, and the cooled cooling water is sent into the gas cooling device.

2. The lignite treatment and raw coal gas cooling coupling system according to claim 1, wherein: The sedimentation tank is provided with a first partition board and a second partition board. The first partition board and the second partition board divide the sedimentation tank into a sedimentation chamber, a buffer chamber, and a clear water chamber that are connected in sequence. The sedimentation tank is provided with a water inlet and a water outlet. The water inlet is communicated with the sedimentation chamber, and the water outlet is communicated with the clear water chamber.

3. The lignite treatment and raw gas cooling coupling system according to claim 2, characterized in that: The first partition board is L-shaped. A baffle is installed on the second partition board. The baffle is inclined. The end of the baffle close to the first partition board is lower than the end where the baffle is connected to the second partition board. The baffle and the first partition board partially overlap in the vertical direction.

4. The lignite treatment and raw gas cooling coupling system according to claim 3, characterized in that: A filter cotton is arranged between the baffle and the first partition board.

5. The lignite treatment and raw coal gas cooling coupling system according to claim 1, characterized in that: The primary retorting furnace includes a furnace body and a coal cooler. The furnace body has a preheating zone, a drying zone, and a cooling zone. The coal cooler is arranged in the cooling zone. The coal cooler is connected to the reservoir and the air cooling tower through pipelines.

6. The lignite treatment and raw gas cooling coupling system according to claim 1, wherein: The gas cooling device includes a cooling tower, a flow dividing cover, a buffer plate, and an atomizing sprayer. The cooling tower has a cooling chamber, an air inlet, an air outlet, a drain port, and a slag discharge port. The air inlet, the air outlet, and the slag discharge port are communicated with the cooling chamber. The flow dividing cover is arranged in the cooling chamber. The flow dividing cover is located below the air inlet. The flow dividing cover is used for dividing the gas flow to make the gas evenly distributed in the cooling chamber. The buffer plate is arranged in the cooling chamber and is located below the flow dividing cover. The buffer plate is used for slowing down the flow rate of the gas. The atomizing sprayer is installed in the cooling chamber. The atomizing sprayer is used for spraying atomized cooling water. The air outlet is used for discharging the cooled gas. The slag discharge port is used for discharging the precipitated dust. A valve is arranged at the slag discharge port. The drain port is used for discharging the cooling water containing impurities.

7. The lignite treatment and raw coal gas cooling coupling system according to claim 6, characterized in that: The flow dividing cover is provided with ventilation holes.

8. The lignite treatment and raw coal gas cooling coupling system according to claim 6, characterized in that: There are multiple buffer plates, and the multiple buffer plates are arranged in sequence.

9. The lignite treatment and raw coal gas cooling coupling system according to claim 8, wherein: The buffer plate has ventilation holes, and a condensation net is arranged on the buffer plate at the bottommost layer.

10. The lignite treatment and raw coal gas cooling coupling system according to claim 6, characterized in that: The atomizing sprayer includes an annular pipeline and atomizing nozzles arranged on the annular pipeline. The annular pipeline is installed on the inner wall of the cooling tower.

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