Solid-gas separation device for chloride tail gas pipeline

Abstract

The utility model relates to the technical field of industrial tail gas treatment, and discloses a chloride tail gas pipeline solid-gas separation device which is connected to a tail gas pipe at the output end of a condenser and comprises a separation shell and a material settling bin, and a gas inlet and a gas outlet are formed in the two ends of the separation shell respectively; the settling bin is conical and located at the bottom of the separation shell, the settling bin and the separation shell are internally communicated, and the bottom of the settling bin is connected with a collecting bag; a plurality of baffle plates are alternately arranged in the separation shell up and down; a cleaning opening is formed in the top of the separation shell, a cleaning mechanism is arranged at the cleaning opening and comprises a closing plate and a rotary spray head, the closing plate is slidably arranged on the cleaning opening, the rotary spray head is arranged at one end of the closing plate, compressed air is communicated outside the rotary spray head, and the cleaning opening is closed by the closing plate in a normal state. In practical application, the device effectively reduces the pipeline cleaning frequency, realizes simple cleaning of the tail gas pipe, and reduces the cleaning and production cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to industrial tail gas treatment technical field, concretely relates to a kind of chloride tail gas pipeline solid-gas separation device. BACKGROUND

[0002] Zirconium tetrachloride (ZrCl4) is an important chemical material, which has been widely used in various industries, especially in ceramics, catalysts and nuclear industry. Its main production methods include reduction method and electrolysis method. Among them, the reduction method is one of the more common production processes. In this method, zirconium tetrachloride is reduced to metallic zirconium by high temperature reaction, and zirconium tetrachloride is condensed into powder after passing through the condenser, then enters the tail gas pipe and finally reaches the water washing tower for further treatment.

[0003] However, due to the strong adhesion of zirconium tetrachloride powder, it will gradually deposit and adhere to the inner wall of the pipe when it passes through the tail gas pipe. Over time, these deposits will gradually reduce the internal ventilation section of the tail gas pipe, and in severe cases, it may even completely block the pipe, which not only significantly reduces the gas flow rate in the tail gas pipe, but also seriously affects the tail gas treatment efficiency of the entire system. Under the existing process conditions, in order to remove these deposits, the entire production line needs to be stopped, and a thorough cleaning needs to be performed every half year, which is costly and greatly affects production. SUMMARY

[0004] The utility model intends to provide a kind of chloride tail gas pipeline solid-gas separation device, to realize the simple cleaning of tail gas pipe, reduce cleaning and production cost.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: a kind of chloride tail gas pipeline solid-gas separation device is connected to the tail gas pipe of condenser output end, including separation shell and sink material bin, separation shell two ends are equipped with air inlet and air outlet respectively;The sink material bin is conical, and the sink material bin is located at the bottom of the separation shell and the two are internally connected, and the sink material bin bottom is connected with collection bag;A plurality of baffle plates are alternately arranged in the separation shell;The top of the separation shell is provided with a cleaning opening, and the cleaning mechanism is arranged at the cleaning opening, the cleaning mechanism includes a closure plate and a rotating nozzle, the closure plate is slidingly arranged on the cleaning opening, and the rotating nozzle is arranged at one end of the closure plate, and the rotating nozzle is connected with compressed air, and the closure plate closes the cleaning opening in normal state.

[0006] The principle and advantages of the present scheme are:

[0007] 1. In actual application, when the tail gas containing zirconium tetrachloride dust passes through the separation device, the flow area of ​​the separation shell is instantly expanded compared to the tail gas pipe, and the flow rate of the tail gas entering the separation shell is instantly reduced. The zirconium tetrachloride dust gradually settles into the settling bin under the action of its own gravity and inertia, thereby achieving dust separation of the tail gas; moreover, in this scheme, the separation device is placed close to the output end of the condenser. At this time, the dust content in the tail gas that has just been condensed is the highest. Most of the dust can be filtered out when passing through the separation device, which greatly reduces dust accumulation in the subsequent tail gas pipe. The entire tail gas pipe will no longer be blocked by dust. It only needs to regularly recover the dust in the settling bin, which greatly reduces the frequency and difficulty of cleaning; reducing the number of parking times and effectively reducing parking losses.

[0008] 2. The overall length of the separation device of this scheme is about 3.5 meters and the installation height is about 3 meters. Manual cleaning operations are difficult. Therefore, a cleaning mechanism is provided to automatically clean the dust agglomerated inside the separation device. Under normal circumstances, the closing plate closes the cleaning opening. When cleaning is required, the rotating nozzle moves with the closing plate to the cleaning opening to clean the agglomerated dust in the device. This will not affect the daily operation of the separation device, reduce the cleaning difficulty and cleaning cycle, and do not require manual intervention in the cleaning process, reducing the harm of zirconium tetrachloride to the human skin and respiratory system of the operators; and the cleaning mechanism in this scheme uses compressed air to clean the agglomerated dust instead of water, because zirconium tetrachloride will react with water to release toxic and corrosive fumes, which pollute the ambient air, and after cleaning with water, the device needs to be dried, which increases the process and time. The above problems will not occur during cleaning in this scheme, and the overall environment is more environmentally friendly and safer.

[0009] 3. The separation device of this solution has a simple overall structure and is easy to install. It does not require major adjustments to existing equipment and pipelines, and has a low cost, so there is no need to invest a lot of money in transformation. Moreover, this device is not affected by environmental and process factors and can be applied to a variety of exhaust gas treatment devices containing larger particles of dust, with strong versatility.

[0010] Furthermore, the number of the sinking bins is 2-4.

[0011] Multiple sinking silos effectively increase the amount of dust collected, which can significantly extend the interval between each cleaning and reduce maintenance frequency and cost. At the same time, the number of sinking silos should not exceed four because too many sinking silos will cause the separation device to occupy too much length in the exhaust pipe, and the airflow rate of the exhaust gas in the separation device will be relatively slow. If this distance is too long, the exhaust gas rate will be too low, and the time it takes to completely flow through the separation device will be too long, resulting in too low overall exhaust gas treatment efficiency.

[0012] Furthermore, the baffle is provided with a plurality of vent holes, and the diameter of the vent holes is less than 50 μm.

[0013] The particle size of zirconium tetrachloride dust is about 50 μm, and the small-diameter vent holes designed on the baffle plate act as filter plates, which can effectively block the dust from passing through while ensuring the flow of gas, further realizing dust filtration, greatly reducing the dust content in the tail gas, reducing the amount of dust deposited in the subsequent pipeline, and effectively reducing the cleaning frequency and cost.

[0014] Further, the distance between the two adjacent baffles is 60-80 cm.

[0015] The baffle is designed to prevent dust from directly reaching the gas outlet with the airflow, but too close distance between adjacent baffles will increase airflow resistance, resulting in increased energy consumption, and too far distance will not achieve the effect of bending the airflow path, and the blocking and filtering effect of dust is reduced. Within the above range, the tail gas can simultaneously ensure the flow rate and dust separation effect when passing through the separation shell.

[0016] Further, the tail gas pipe is provided with a standby gas conveying pipe at the separation device, both ends of the standby gas conveying pipe are provided with first switch valves, and the gas inlet and gas outlet ends of the separation shell are provided with second switch valves.

[0017] When the separation device is in the period of maintenance or cleaning by the cleaning mechanism, the tail gas flows through the standby gas conveying pipe, avoiding the impact of parking on production, ensuring the yield, and reducing the parking loss.

[0018] Further, the inner walls of the separation shell and the sediment tank are provided with a corrosion-resistant layer.

[0019] Since the zirconium tetrachloride tail gas contains high concentrations of hydrochloric acid and other corrosive gases, these gases can cause serious corrosion to the equipment itself, and therefore the installation of a corrosion-resistant layer can effectively reduce the degree of corrosion and prolong the service life of the entire device.

[0020] Further, the bottom of the separation shell is provided with a support rod.

[0021] The separation device itself plus the dust collected inside has a certain weight, and this weight is a concentrated load for the entire pipeline, which is difficult for the pipeline itself to bear. The support rod assists in supporting the separation device, preventing the pipeline from being bent or even collapsed due to the weight, and ensuring the overall stability of the pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 It is a position diagram of an embodiment of the present utility model.

[0023] Fig. 2 It is a device structure diagram of an embodiment of the present utility model.

[0024] Fig. 3 It is a structure diagram of the closure plate and the rotating spray head. DETAILED DESCRIPTION

[0025] The following is further described in detail through specific embodiments:

[0026] The reference signs in the drawings of the specification include: tail gas pipe 100, separation shell 1, sediment bin 2, gas inlet 3, gas outlet 4, baffle plate 5, cleaning opening 6, closing plate 7, rotating spray head 8, containing groove 9, electromagnet 10, magnetic block 11, spring 12, standby gas conveying pipe 13, first on-off valve 14, second on-off valve 15, support rod 16, telescopic rod 17.

[0027] The embodiment is basically as shown in the accompanying drawings: Figs. 1-3

[0028] A chloride tail gas pipeline solid-gas separation device is arranged between a condenser and a water washing tower and connected to a tail gas pipe 100 at the output end of the condenser, comprising a separation shell 1 and a sediment bin 2, the separation shell 1 is respectively provided with a gas inlet 3 and a gas outlet 4 at both ends, and the end portions of the gas inlet 3 and the gas outlet 4 and the two interface end portions of the tail gas pipe 100 are all provided with mounting flanges, so as to realize detachable connection of the separation device and the tail gas pipe; the sediment bin 2 is conical, the sediment bin 2 is located at the bottom of the separation shell 1 and the interiors of the two are communicated, and a collecting bag is connected at the bottom, so as to recycle zirconium tetrachloride dust; preferably, the number of the sediment bins 2 is 2-4, the multiple sediment bins 2 effectively increase the dust collection amount, can significantly prolong the interval time of each cleaning, reduce the maintenance frequency and cost; at the same time, too many sediment bins 2 can avoid occupying too much length of the separation device in the tail gas pipe 100, and the gas flow rate of the tail gas in the separation device is relatively slow, and too long distance will make the tail gas rate too low and the time for the tail gas to completely flow through the separation device too long, and the overall processing efficiency of the tail gas is too low.

[0029] In order to prevent the dust from directly reaching the gas outlet 4 with the gas flow and failing to effectively realize dust separation, a plurality of baffle plates 5 are alternately arranged in the separation shell 1, the baffle plates 5 make the tail gas bend in the separation shell 1 and flow through, and effectively block the dust; the distance between the adjacent two baffle plates 5 is 60-80 cm, too close distance will increase the air flow resistance and cause energy consumption to increase, and too far distance will fail to achieve the effect of the bending gas flow path, and the blocking and filtering effect of the dust is reduced, and within the above range, the tail gas can synchronously ensure the flow rate and the dust separation effect when passing through the separation shell 1; a plurality of air holes are also opened in the baffle plates 5, the diameter of the air holes is less than 50 μm, the particle size of the zirconium tetrachloride dust is about 50 μm, the small-diameter air holes in the baffle plates 5 act as filter plates, can effectively block the dust from passing through when ensuring the gas flow, further realize dust filtration, greatly reduce the dust content in the tail gas, reduce the dust deposition amount in the subsequent pipeline, and effectively reduce the cleaning frequency and cost.

[0030] ​At present, in the process of reducing production of zirconium, the temperature of zirconium tetrachloride in the tail gas is reduced to form a powder after passing through the condenser. During the process of reaching the water washing tower, it will gradually deposit in each part of the tail gas pipe 100. With the passage of time, the blockage in the tail gas pipe 100 becomes more and more serious, which sharply reduces the flow area of the pipe, and the suction rate of the tail gas pipe 100 and the efficiency of the tail gas treatment are reduced.

[0031] Therefore, by the above arrangement, the separation device is arranged on the pipeline at the output end of the condenser. The tail gas just after condensation enters the separation housing 1 from the gas inlet 3 and enters the separation housing 1 from the tail gas pipe 100. The space is temporarily expanded. According to the relevant principles of fluid mechanics, the speed of the tail gas is temporarily reduced, and the dust is separated from the gas under the influence of inertia and gravity, and gradually settles in the sedimentation bin 2 under the blocking action of the baffle 5. Then the dust in the sedimentation bin 2 is recycled regularly, so that the tail gas pipe 100 from the condenser to the water washing tower will not be seriously deposited and blocked. The interval time of each cleaning is significantly increased, the number of shutdowns is reduced, the cleaning cost is significantly reduced, and the shutdown loss is significantly reduced. Secondly, the overall structure of the separation device is simple, easy to install and operate, and does not need to make major adjustments to the existing equipment and pipelines, and the cost is low, without the need to invest a large amount of money for modification.

[0032] Preferably, the inner wall of the separation housing 1 and the sedimentation bin 2 is provided with a corrosion-resistant layer, which can effectively reduce the corrosion of high-concentration hydrochloric acid and other corrosive gases in the zirconium tetrachloride tail gas to the inner wall of the device, prolonging the service life of the device as a whole.

[0033] Since the overall length of the separation device of the present scheme is about 3.5 meters, and the installation height is about 3 meters, manual cleaning operation is difficult, so a cleaning mechanism is arranged to automatically clean the caked dust in the separation device, such as Fig. 2 、 Fig. 3As shown, the top center of the separation housing 1 is provided with a cleaning opening 6, and a cleaning mechanism is arranged at the cleaning opening 6, including a closing plate 7 and a rotating spray head 8. The closing plate 7 is slidingly arranged on the cleaning opening 6, and the separation housing 1 is provided with a sliding groove on both sides of the cleaning opening 6, which is an inclined L-shaped. The two sides of the closing plate 7 are L-shaped and extend into the sliding groove. A cylinder for driving the closing plate 7 to slide is fixed on the separation housing, and the shaft end of the cylinder is fixed on the closing plate 7. The rotating spray head 8 is arranged at one end of the closing plate 7 away from the cylinder. A receiving groove 9 is opened at the bottom of the closing groove, and the rotating spray head 8 is installed in the receiving groove 9. An electromagnet 10 is embedded in the top of the receiving groove 9. A magnetic block 11 is fixed on the rotating spray head 8. A spring 12 is fixed between the receiving groove 9 and the rotating spray head 8. The spring 12 is provided with an extension rod 17, and the two ends of the extension rod 17 are fixed with the rotating spray head 8 and the closing plate 7 respectively for supporting the rotating spray head 8. The rotating spray head 8 is connected with compressed air. Under normal circumstances, the closing plate 7 closes the cleaning opening 6. The electromagnet 10 is energized and the rotating spray head 8 is attracted upward by the magnetic block 11. The magnetic force between the electromagnet 10 and the magnetic block 11 is greater than the elastic force generated by the compression of the spring 12, so that the bottom of the rotating spray head 8 is higher than the top of the separation housing 1, preventing the rotating spray head 8 from being scratched and worn when moving with the closing plate 7. When cleaning is needed, the rotating spray head 8 moves to the cleaning opening 6 with the closing plate 7. The electromagnet is de-energized, and the elastic force of the spring 12 acts on the rotating spray head 8 to make it located in the separation housing 1. Then, high-pressure air passes through the rotating spray head 8 to clean the agglomerated dust in the device, without the need for manual treatment of the agglomerated dust.

[0034] The tail gas pipe 100 is provided with a standby gas conveying pipe 13 at the separation device. The two ends of the standby gas conveying pipe 13 are provided with first switch valves 14, and the ends of the gas inlet 3 and the gas outlet 4 of the separation housing 1 are provided with second switch valves 15. When the separation device is in maintenance or cleaning by the cleaning mechanism, the tail gas flows through the standby gas conveying pipe 13, avoiding the impact of parking on production, ensuring yield, and reducing parking loss.

[0035] Because the separation device itself and the dust collected inside have a certain weight, and this weight is a concentrated load for the entire pipeline, the pipeline itself is difficult to bear. Therefore, a support rod 16 is arranged at the bottom of the separation housing 1, and the bottom of the support rod 16 is fixed by anchor bolts to assist in supporting the separation device, preventing the pipeline from being bent or even collapsed due to the weight, and ensuring the overall stability of the pipeline.

[0036] The above only is the embodiment of the present application, and the well-known specific technical solutions and / or common knowledge in the scheme are not described in detail. It should be pointed out that, for those skilled in the art, without departing from the technical solutions of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope claimed in the present application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A chloride tail gas pipeline gas-solid separation device, characterized by: The tail gas pipe connected to the output end of the condenser comprises a separation shell and a material settling bin, the separation shell is provided with an air inlet and an air outlet at two ends respectively, the material settling bin is conical, the material settling bin is located at the bottom of the separation shell and the two are internally communicated, the material settling bin is connected with a collecting bag at the bottom, a plurality of baffle plates are alternately arranged in the separation shell, the top of the separation shell is provided with a cleaning opening, a cleaning mechanism is arranged at the cleaning opening, the cleaning mechanism comprises a closing plate and a rotating nozzle, the closing plate is slidingly arranged on the cleaning opening, the rotating nozzle is arranged at one end of the closing plate, the rotating nozzle is externally communicated with compressed air, and the closing plate closes the cleaning opening in normal state.

2. A chloride tail gas conduit solid-gas separation device according to claim 1, characterized in that: The number of the material settling bins is 2-4.

3. A chloride tail gas conduit solid-gas separation device according to claim 2, characterized in that: A plurality of air holes are formed in the baffle plates, the diameter of the air holes is less than 50μm.

4. A chloride tail gas conduit solid-gas separation device according to claim 3, characterized in that: The distance between the adjacent two baffle plates is 60-80cm.

5. A chloride tail gas conduit solid-gas separation device according to claim 4, characterized in that: The tail gas pipe is provided with a standby gas conveying pipe at the separation device, the two ends of the standby gas conveying pipe are provided with first switch valves, and the air inlet and the air outlet end of the separation shell are provided with second switch valves.

6. A chloride tail gas conduit solid-gas separation device according to claim 5, characterized in that: The inner walls of the separation shell and the material settling bin are provided with a corrosion-resistant layer.

7. A chloride off-gas conduit solid-gas separation device according to claim 6, characterized in that: The bottom of the separation shell is provided with a supporting rod.

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