Tail gas recycling device of chlorination furnace for high-purity quartz sand

Abstract

The invention relates to the technical field of chemical engineering and environmental protection, and discloses a tail gas recycling device of a chlorination furnace for high-purity quartz sand, comprising: a tail gas cooling module for cooling high-temperature tail gas to a suitable temperature; the dust removal module is used for removing particulate matters in the tail gas; the washing tower module is used for treating acidic components in the tail gas by spraying an alkaline solution; the absorption module is used for further purifying harmful gas in the tail gas; the tail gas treatment tower module is used for further purifying the tail gas; the resource recycling module is used for recycling useful substances generated in the washing and absorbing process; the fan and discharge module is used for ensuring that the tail gas reaches the standard and is discharged; and the control and safety module is used for monitoring and controlling the operation state of each module. According to the invention, by arranging the resource recovery module, useful substances generated in the washing and absorption process are effectively recovered and utilized, the efficient utilization and circular economy of resources are reflected, and the consumption of raw materials is reduced.

Description

Technical Field

[0001] The invention relates to the field of chemical engineering and environmental protection technology, and in particular to a tail gas recovery and utilization device of a chlorination furnace for high-purity quartz sand. Background Art

[0002] High-purity quartz sand is widely used in industrial production, especially in the fields of optical fiber, electronic materials and high-end glass, where its high purity is crucial to the performance of the final product. In the process of producing high-purity quartz sand, the chlorination method is usually used to purify the quartz sand.

[0003] In the traditional chlorination furnace tail gas treatment system, the tail gas is usually discharged directly after simple cooling and dust removal, and the useful substances in the tail gas are not fully recycled. The tail gas often contains some chemical components, such as calcium chloride and sodium chloride. If these by-products cannot be effectively recovered, it will not only put pressure on the environment, but also waste precious chemical resources. Summary of the invention

[0004] In order to make up for the above shortcomings, the present invention provides a tail gas recovery and utilization device for a chlorination furnace for high-purity quartz sand, aiming to improve the problem that in the traditional chlorination furnace tail gas treatment system, useful substances in the tail gas cannot be fully recovered and utilized.

[0005] In the first aspect, the present invention provides the following technical solution: a tail gas recovery and utilization device for a chlorination furnace for high-purity quartz sand, comprising: The exhaust gas cooling module is used to cool the high-temperature exhaust gas to a suitable temperature so that the exhaust gas can smoothly enter the dust removal module for further processing; The dust removal module is used to remove particulate matter from the exhaust gas, so that the exhaust gas reaches a lower particle concentration before entering the scrubber module; The scrubber module is used to treat the acidic components in the tail gas by spraying alkaline solution to reduce the acid gas content and make the tail gas components suitable for entering the absorption module for deep purification; The absorption module is used to further purify harmful gases in the tail gas to meet the emission standards and ensure that the processing load of the tail gas treatment tower module is reduced, so that the pollutant content of the tail gas reaches an appropriate level when it enters the tail gas treatment tower module; The tail gas treatment tower module is used to further purify the tail gas and remove organic matter and residual harmful components so that it can be finally discharged through the fan and emission module; Resource recovery module, used to recover useful substances generated during washing and absorption, and further concentrate and crystallize them to achieve efficient utilization of resources; The fan and exhaust module is used to ensure that the exhaust gas meets the emission standards and discharge the purified exhaust gas into the atmosphere, completing the final step of exhaust gas treatment; The control and safety module is used to monitor and control the operating status of each module and coordinate the operation between modules.

[0006] Preferably, the exhaust gas cooling module includes a heat exchanger and a cooling water circulation unit; The heat exchanger is a shell and tube heat exchanger or a plate heat exchanger, the cooling medium is water or air, and the heat exchanger cools the high-temperature exhaust gas through heat transfer of the medium; The cooling water circulation unit includes a cooling water circulation pump and a cooling water storage tank. The cooling water circulation pump allows the cooling water to flow continuously to maintain cooling.

[0007] Preferably, the dust removal module includes a bag filter or an electrostatic precipitator and a vibration cleaning unit; The bag filter includes filter bags, and regularly removes attached particulate matter through a vibrating cleaning unit. The electrostatic precipitator includes a high-voltage power supply and a dust collecting plate. The bag filter captures particulate matter in the exhaust gas through the filter bags and removes it through the vibrating cleaning unit. The electrostatic precipitator absorbs tiny particles through electrostatic action to ensure the removal of solid particles in the exhaust gas.

[0008] Preferably, the washing tower module includes a spray device, a packing layer, a circulating liquid pump and a liquid level control unit; The spray device includes a nozzle and a spray pipe, the packing layer is used to increase the gas-liquid contact area, the circulating liquid pump is used to circulate the washing liquid to the spray device, and the liquid level control unit includes a liquid level sensor and a control valve; the spray device sprays the alkaline solution into the exhaust gas through the nozzle, the packing layer provides a larger gas-liquid contact surface, and the liquid level control unit maintains the stability of the washing liquid level and the continuity of the washing process.

[0009] Preferably, the absorption module comprises an alkali solution absorption tower, a nozzle and a pH monitoring unit; The alkali solution absorption tower is designed for multi-stage absorption, the nozzles are arranged in the tower for evenly distributing the alkali solution, and the pH monitoring unit includes a pH sensor and an alkali solution addition control system; the alkali solution absorption tower effectively removes harmful components in the tail gas through the multi-stage absorption structure, the nozzles evenly distribute the alkali solution, the pH monitoring unit monitors the pH of the absorption liquid in real time, and adjusts the amount of alkali solution added through the alkali solution addition control system.

[0010] Preferably, the tail gas treatment tower module includes an activated carbon adsorption tower and a high-efficiency demisting unit; The activated carbon adsorption tower comprises an activated carbon bed and an adsorption tower shell, and the high-efficiency demisting unit comprises a demister and a gas-liquid separator; The activated carbon adsorption tower uses an activated carbon bed to adsorb organic matter and residual harmful components in the tail gas, and the high-efficiency demisting unit removes water mist in the tail gas through a demister and a gas-liquid separator; The resource recovery module consists of a sedimentation tank, a filtration unit and a crystallization unit; The sedimentation tank is used to separate solids from liquids, the filtration unit includes a filter and a filtration pump, the crystallization unit is used to concentrate and crystallize the solution in the sedimentation tank to recover high-purity chloride salt, and the crystallization unit includes an evaporator and a cooling crystallizer; The sedimentation tank separates the solid particles by gravity, the filtration unit further removes the tiny solid particles in the solution, and the crystallization unit recovers high-purity chloride salt through evaporation and cooling crystallization steps.

[0011] Preferably, the fan and exhaust module includes an induced draft fan, an exhaust chimney and an exhaust gas online monitoring unit; The induced draft fan is used to send the purified tail gas into the exhaust chimney, and the exhaust chimney is used to discharge the purified tail gas into the atmosphere. The tail gas online monitoring unit is used to monitor the pollutant concentration in the exhaust gas in real time; The control and safety module includes a PLC automatic control unit, an alarm unit and an emergency discharge unit. The PLC automatic control unit includes a programmable logic controller, the alarm unit includes an audible and visual alarm, the emergency discharge unit includes an emergency discharge valve and a safety pressure relief device, and includes a temperature sensor, a pressure sensor and a liquid level sensor; The PLC automatic control unit controls the operation of each module according to the sensor feedback information, the alarm unit issues an alarm when the parameter exceeds the limit, and the emergency emission unit is used to emit exhaust gas.

[0012] In a second aspect, the present invention provides the following technical solution, a method for operating a tail gas recovery and utilization device of a chlorination furnace for high-purity quartz sand, comprising the following steps: S1: The exhaust gas is cooled by the exhaust gas cooling module to cool the high-temperature exhaust gas to a suitable temperature; S2: The cooled exhaust gas enters the dust removal module, where particulate matter in the exhaust gas is removed by the dust collector, so that the exhaust gas reaches a lower particle concentration before entering the scrubber module; S3: The exhaust gas after dust removal enters the scrubber module, and the acidic components in the exhaust gas are treated by spraying alkaline solution to reduce the content of acidic gas; S4: The washed tail gas enters the absorption module and passes through the alkaline solution absorption tower to further remove harmful gases in the tail gas to meet the emission standards; S5: The tail gas treated by the absorption module enters the tail gas treatment tower module to further remove organic matter and residual harmful components in the tail gas; S6: The useful substances generated during washing and absorption are recovered through the resource recovery module and then utilized as resources through the processes of precipitation, filtration and crystallization; S7: The exhaust gas passes through the fan and the emission module to meet the emission standards, and the purified exhaust gas is discharged into the atmosphere; S8: Finally, the operating status of each module is monitored and controlled through the control and safety module.

[0013] In the third aspect, the invention provides the following technical solution: a computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the operating method of the exhaust gas recovery and utilization device of the chlorination furnace for high-purity quartz sand when executing the computer program.

[0014] In a fourth aspect, the present invention provides the following technical solution: a readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the operation method of the exhaust gas recovery and utilization device of the chlorination furnace for high-purity quartz sand is implemented.

[0015] The present invention has the following beneficial effects: 1. In the present invention, by setting up a resource recovery module, the useful substances generated in the washing and absorption processes are effectively recovered and utilized, which embodies the efficient utilization of resources and the concept of circular economy, not only reduces the consumption of raw materials, but also reduces the production cost through the reuse of resources.

[0016] 2. In the present invention, each module is monitored and controlled by a PLC automatic control system, the process parameters are adjusted in real time, and abnormal conditions are responded to promptly, which effectively improves the reliability of the device. It greatly reduces manual intervention, reduces equipment failure rate, and improves production efficiency, demonstrating significant innovation in industrial intelligent control.

[0017] 3. In the present invention, a modular design is adopted, and each module can be operated and maintained independently, which is convenient for regular maintenance and troubleshooting, and is easy to expand and optimize. The modular design concept makes the exhaust gas treatment device more scalable and can be flexibly adjusted according to different process requirements. This modular thinking is a creative improvement in the field of exhaust gas treatment, making the system more flexible and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a system architecture diagram of a tail gas recovery and utilization device for a chlorination furnace for high-purity quartz sand proposed by the present invention; Figure 2 This is a diagram of the tail gas cooling module architecture of a tail gas recovery and utilization device for a chlorination furnace for high-purity quartz sand proposed by the present invention; Figure 3 This is a dust removal module architecture diagram of a tail gas recovery and utilization device for a chlorination furnace for high-purity quartz sand proposed by the present invention; Figure 4This is a structural diagram of a washing tower module of a tail gas recovery and utilization device of a chlorination furnace for high-purity quartz sand proposed by the present invention; Figure 5 This is a diagram of the absorption module architecture of a tail gas recovery and utilization device for a chlorination furnace for high-purity quartz sand proposed by the present invention; Figure 6 This is a module architecture diagram of a tail gas treatment tower of a tail gas recovery and utilization device for a chlorination furnace for high-purity quartz sand proposed by the present invention; Figure 7 This is a resource recovery module architecture diagram of a tail gas recovery and utilization device for a chlorination furnace for high-purity quartz sand proposed by the present invention; Figure 8 This is a fan and emission module architecture diagram of a tail gas recovery and utilization device for a chlorination furnace for high-purity quartz sand proposed by the present invention; Fig. 9 This is a control and safety module architecture diagram of a tail gas recovery and utilization device for a chlorination furnace for high-purity quartz sand proposed in the present invention. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments 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 creative work are within the scope of protection of the present invention.

[0020] Embodiment 1:

[0021] Reference Figure 1-Figure 9 In the first embodiment of the present invention, the present invention provides a tail gas recovery and utilization device for a chlorination furnace for high-purity quartz sand, comprising: The exhaust gas cooling module is used to cool the high-temperature exhaust gas to a suitable temperature so that the exhaust gas can smoothly enter the dust removal module for further processing; The dust removal module is used to remove particulate matter from the exhaust gas, so that the exhaust gas reaches a lower particle concentration before entering the scrubber module; The scrubber module is used to treat the acidic components in the tail gas by spraying alkaline solution to reduce the acid gas content and make the tail gas components suitable for entering the absorption module for deep purification; The absorption module is used to further purify harmful gases in the tail gas to meet the emission standards and ensure that the processing load of the tail gas treatment tower module is reduced, so that the pollutant content of the tail gas reaches an appropriate level when it enters the tail gas treatment tower module; The tail gas treatment tower module is used to further purify the tail gas and remove organic matter and residual harmful components so that it can be finally discharged through the fan and emission module; Resource recovery module, used to recover useful substances generated during washing and absorption, and further concentrate and crystallize them to achieve efficient utilization of resources; The fan and exhaust module is used to ensure that the exhaust gas meets the emission standards and discharge the purified exhaust gas into the atmosphere, completing the final step of exhaust gas treatment; The control and safety module is used to monitor and control the operating status of each module and coordinate the operation between modules.

[0022] Specifically, the device of the present invention recycles and utilizes useful substances in tail gas through a resource recovery module, which has a significant beneficial effect of resource recycling. In particular, by-products (such as sodium chloride, calcium chloride, etc.) generated during the washing and absorption process can be precipitated, filtered and crystallized through the resource recovery module to recover high-purity chemical substances. This resource recovery mechanism effectively avoids waste of resources, reduces the consumption of raw materials and waste emissions, realizes efficient recycling of resources, and significantly improves the economic benefits of production. At the same time, by recycling and utilizing by-products, pollution to the environment is reduced, which meets the requirements of green and environmentally friendly production, and further reflects the innovation and superiority of the present invention in terms of resource utilization and environmental protection.

[0023] The exhaust gas cooling module includes a heat exchanger and a cooling water circulation unit; The heat exchanger is a shell and tube heat exchanger or a plate heat exchanger, and the cooling medium is water or air. The heat exchanger cools the high-temperature exhaust gas through the heat transfer of the medium; The cooling water circulation unit includes a cooling water circulation pump and a cooling water storage tank. The cooling water circulation pump allows the cooling water to flow continuously to maintain cooling.

[0024] Specifically, the tail gas cooling module is used to cool the high-temperature tail gas discharged from the chlorination furnace to a suitable temperature so that subsequent treatment can proceed smoothly. The module mainly includes a heat exchanger and a cooling water circulation unit.

[0025] Heat exchanger: used to efficiently transfer the heat of the exhaust gas to the cooling medium. The type of heat exchanger can be shell and tube or plate. Both types of heat exchangers have good heat transfer effects and can efficiently cool the exhaust gas to the design temperature.

[0026] Cooling water circulation unit: includes cooling water circulation pump and cooling water storage tank. The circulation pump is used to maintain the continuous flow of cooling water in the system to ensure the cooling effect; the cooling water storage tank provides storage space for cooling water to ensure the continuous operation of the cooling system. After the exhaust gas is cooled, the reduced temperature exhaust gas flows into the dust removal module.

[0027] The dust removal module includes a bag filter or an electrostatic precipitator and a vibration cleaning unit; The bag filter includes filter bags and regularly removes attached particulate matter through a vibrating cleaning unit. The electrostatic precipitator includes a high-voltage power supply and dust collecting plates. The bag filter captures particulate matter in the exhaust gas through the filter bags and removes it through a vibrating cleaning unit. The electrostatic precipitator absorbs tiny particles through electrostatic action to ensure the removal of solid particles in the exhaust gas.

[0028] Specifically, the dust removal module is used to remove particulate matter from the cooled exhaust gas to prevent the particulate matter from affecting the subsequent washing and absorption processes. The dust removal module includes a bag filter or an electrostatic precipitator and a vibration cleaning unit.

[0029] Bag filter: uses filter bags to capture particulate matter in the exhaust gas. The filter bags are usually made of high temperature resistant and corrosion resistant materials to ensure long-term operation under chlorinated exhaust gas conditions.

[0030] Vibration cleaning unit: removes particles attached to the surface of the filter bag by vibration to maintain dust removal efficiency.

[0031] Electrostatic precipitator: The electrostatic precipitator can effectively remove particles with smaller particle size by ionizing the tiny particles in the exhaust gas through the electric field and capturing them on the dust collecting plate. The exhaust gas after dust removal flows into the scrubber module.

[0032] The scrubber module includes a spray device, a packing layer, a circulating liquid pump and a liquid level control unit; The spray device includes a nozzle and a spray pipe, the packing layer is used to increase the gas-liquid contact area, the circulating liquid pump is used to circulate the washing liquid to the spray device, and the liquid level control unit includes a liquid level sensor and a control valve; the spray device sprays the alkaline solution into the exhaust gas through the nozzle, the packing layer provides a larger gas-liquid contact surface, and the liquid level control unit maintains the stability of the washing liquid level and the continuity of the washing process.

[0033] Specifically, the scrubber module treats the acidic components in the tail gas by spraying alkaline solution to reduce the content of acidic gas in the tail gas and protect the equipment and processes of the subsequent modules. The module mainly includes a spray device, a packing layer, a circulating liquid pump and a liquid level control unit.

[0034] Spraying device: It includes a nozzle and a spraying pipe. The nozzle evenly sprays the alkaline solution into the exhaust gas to remove the acidic components through the contact between the droplets and the gas.

[0035] Packing layer: Increases the gas-liquid contact area and is usually made of corrosion-resistant materials to ensure full contact between the exhaust gas and the alkaline solution, thereby improving the removal efficiency of the acidic components.

[0036] Circulating liquid pump: used to continuously circulate the alkaline detergent to the spray device, thereby reducing the consumption of detergent.

[0037] Liquid level control unit: includes liquid level sensor and control valve, used to maintain the stability of the liquid level of the scrubbing liquid and ensure the normal operation of the system. The tail gas after scrubbing enters the absorption module.

[0038] The tail gas treatment tower module includes an activated carbon adsorption tower and a high-efficiency demisting unit; The activated carbon adsorption tower includes an activated carbon bed and an adsorption tower shell, and the high-efficiency demisting unit includes a demister and a gas-liquid separator; The activated carbon adsorption tower uses the activated carbon bed to adsorb organic matter and residual harmful components in the tail gas, and the high-efficiency demisting unit removes water mist in the tail gas through the demister and gas-liquid separator; The resource recovery module consists of a sedimentation tank, a filtration unit and a crystallization unit; The sedimentation tank is used to separate solids from liquids, the filtration unit includes a filter and a filtration pump, the crystallization unit is used to concentrate and crystallize the solution in the sedimentation tank to recover high-purity chloride salt, and the crystallization unit includes an evaporator and a cooling crystallizer; The sedimentation tank separates the solid particles by gravity, the filtration unit further removes the tiny solid particles in the solution, and the crystallization unit recovers high-purity chloride salt through evaporation and cooling crystallization steps.

[0039] Specifically, the tail gas treatment tower module is used to further purify the tail gas and remove the residual organic matter and harmful components therein to ensure that the pollutant concentration in the tail gas meets the emission standards. This module mainly includes an activated carbon adsorption tower and a high-efficiency demisting unit.

[0040] Activated carbon adsorption tower: The activated carbon bed can adsorb residual organic matter and other harmful components in the exhaust gas. Activated carbon has a large specific surface area and strong adsorption capacity, and is suitable for removing trace organic pollutants in the exhaust gas.

[0041] High-efficiency demisting unit: It includes a demisting device and a gas-liquid separator. The demisting device is used to remove water mist in the exhaust gas, and the gas-liquid separator further separates gas and liquid to improve the dryness of the exhaust gas. The treated exhaust gas is sent to the fan and exhaust module.

[0042] The resource recovery module is used to recover useful substances from the waste liquid generated during the washing and absorption process, and achieve efficient resource utilization through further concentration and crystallization. The module consists of a sedimentation tank, a filtration unit, and a crystallization unit.

[0043] Sedimentation tank: used to separate solid particles from waste liquid and use gravity to settle the solids to form slurry.

[0044] Filtration unit: includes filter and filter pump, used to remove smaller solid particles in the waste liquid to ensure that the crystallization process will not affect the operation of the equipment due to the presence of solid matter.

[0045] Crystallization unit: It includes an evaporator and a cooling crystallizer. The evaporator is used to concentrate the solute in the waste liquid to make it supersaturated, and the cooling crystallizer crystallizes the solute to recover useful substances such as high-purity chloride salt.

[0046] The purpose of the absorption module is to further purify harmful gases in the tail gas to ensure that the exhaust gas meets environmental standards. The module consists of an alkali liquid absorption tower, a nozzle and a pH monitoring unit.

[0047] Alkali liquid absorption tower: It is a multi-stage absorption structure with multiple nozzles distributed inside to ensure that the absorption liquid can be evenly sprayed into the tower and react chemically with the harmful components in the exhaust gas.

[0048] Nozzle arrangement: The nozzles in the tower are evenly distributed to allow the alkali solution to react fully with the tail gas, thus improving the absorption efficiency.

[0049] pH monitoring unit: including pH sensor and alkali solution addition control system, real-time monitoring of the pH value of the absorption liquid, and adjusting the amount of alkali solution added as needed to ensure the acid-base balance during the absorption process. The tail gas after absorption enters the tail gas treatment tower module.

[0050] The tail gas treatment tower module includes an activated carbon adsorption tower and a high-efficiency demisting unit; The activated carbon adsorption tower includes an activated carbon bed and an adsorption tower shell, and the high-efficiency demisting unit includes a demister and a gas-liquid separator; The activated carbon adsorption tower uses the activated carbon bed to adsorb organic matter and residual harmful components in the exhaust gas, and the high-efficiency demisting unit removes water mist in the exhaust gas through the demister and gas-liquid separator.

[0051] Specifically, the fan and exhaust module includes an induced draft fan, an exhaust chimney, and an exhaust gas online monitoring unit; The induced draft fan is used to send the purified exhaust gas into the exhaust chimney, and the exhaust chimney is used to discharge the purified exhaust gas into the atmosphere. The exhaust gas online monitoring unit is used to monitor the pollutant concentration in the exhaust gas in real time; The control and safety module includes a PLC automatic control unit, an alarm unit and an emergency discharge unit. The PLC automatic control unit includes a programmable logic controller, the alarm unit includes an audible and visual alarm, the emergency discharge unit includes an emergency discharge valve and a safety pressure relief device, and includes a temperature sensor, a pressure sensor and a liquid level sensor; The PLC automatic control unit controls the operation of each module according to the sensor feedback information. The alarm unit sounds an alarm when the parameters exceed the limit. The emergency emission unit is used to discharge exhaust gas.

[0052] Specifically, the fan and emission module is used to ensure that the exhaust gas can eventually meet the emission standards. The module includes an induced draft fan, an exhaust chimney, and an exhaust gas online monitoring device.

[0053] Induced draft fan: used to send the purified exhaust gas into the exhaust chimney to ensure that the exhaust gas can be discharged smoothly.

[0054] Exhaust chimney: used to discharge the purified exhaust gas into the atmosphere. The height of the chimney is designed according to environmental protection standards to minimize the impact on the surrounding environment.

[0055] Exhaust gas online monitoring device: used to monitor the pollutant concentration in exhaust gas in real time to ensure that exhaust gas emissions meet environmental protection standards.

[0056] The control and safety module runs through the entire exhaust gas treatment process and is responsible for monitoring and coordinating various modules to ensure the stable and safe operation of the system. This module mainly includes the PLC automatic control unit, alarm unit and emergency emission unit.

[0057] PLC automatic control unit: includes a programmable logic controller and its input and output modules, which are used to perform logical control and parameter adjustment on the operation of each module, such as temperature, flow, pH value, etc., to maintain the optimal operating state of the entire system.

[0058] Alarm unit: including sound and light alarms. When a parameter in the system exceeds the preset range, the alarm unit will sound an sound and light alarm to remind the operator to take timely measures.

[0059] Emergency discharge unit: includes emergency discharge valve and safety pressure relief device. When abnormal situation occurs in the system, the emergency discharge unit can quickly discharge the exhaust gas in the system to protect the safety of equipment and operators.

[0060] Embodiment 2: Reference Figure 1 In a second embodiment of the present invention, the present invention provides an operation method of a tail gas recovery and utilization device of a chlorination furnace for high-purity quartz sand, comprising the following steps: S1: Exhaust cooling module cools exhaust gas The exhaust gas is first cooled by the exhaust gas cooling module, which includes a heat exchanger and a cooling water circulation unit.

[0061] Heat exchanger: The high-temperature exhaust gas discharged from the chlorination furnace is heat exchanged with the cooling medium, usually using a shell and tube or plate heat exchanger. Shell and tube heat exchangers are suitable for larger gas flows, while plate heat exchangers have higher heat transfer efficiency. Through the heat exchange process, the temperature of the exhaust gas is reduced to a level suitable for subsequent treatment.

[0062] Cooling water circulation unit: This unit includes a cooling water circulation pump and a cooling water storage tank. The cooling water circulation pump ensures the continuous circulation of cooling water to maintain the stable operation of the cooling system; the cooling water storage tank is used to store cooling water to ensure uninterrupted water supply to the system.

[0063] S2: Dust removal module removes particulate matter from exhaust gas The cooled exhaust gas enters the dust removal module to remove the particles in it to prevent them from affecting the subsequent washing tower and absorption tower. The dust removal module is mainly composed of bag dust collector or electrostatic dust collector and vibration dust cleaning unit.

[0064] Bag filter: The exhaust gas is filtered through multiple filter bags, which are made of high temperature and corrosion resistant materials to adapt to the special properties of the chlorination furnace exhaust gas. The filter bags effectively capture particulate matter to ensure that the exhaust gas reaches a lower particle concentration before entering the scrubber module.

[0065] Electrostatic precipitator: The particles in the gas are charged by a high voltage electric field and then captured by the collecting plates. This method is particularly suitable for removing fine particles.

[0066] Vibration cleaning unit: Regularly vibrate and remove particles attached to the surface of the filter bag to maintain efficient operation of the dust collector.

[0067] S3: Scrubber module treats the acidic components in the exhaust gas The exhaust gas after dust removal enters the scrubber module. The scrubber module removes the acidic components in the exhaust gas by spraying alkaline solution to ensure that the exhaust gas entering the absorption module has a more suitable composition. The module includes a spray device, a packing layer, a circulating liquid pump and a liquid level control unit.

[0068] Spraying device: Alkaline solution is evenly sprayed into the exhaust gas through multiple nozzles. Usually sodium hydroxide or calcium hydroxide solution is used. The droplets are in full contact with the exhaust gas, and the acid-base reaction removes the acid gas.

[0069] Filler layer: It is composed of fillers with high specific surface area, which increases the gas-liquid contact area and thus improves the removal efficiency of acidic components.

[0070] Circulating liquid pump: circulates the washing liquid to the spraying device to reduce the consumption of the solution, and maintains the washing liquid level at an appropriate height through the liquid level control unit to ensure the stability of the spraying effect.

[0071] S4: Absorption module further removes harmful gases The washed exhaust gas enters the absorption module and passes through the alkaline solution absorption tower to further remove harmful components in the exhaust gas so that the exhaust gas can meet the emission standards.

[0072] Alkali absorption tower: It adopts a multi-stage absorption design, with multiple nozzles in the tower so that the alkali can be evenly sprayed everywhere in the tower. The tail gas and alkali fully react in the absorption tower to remove harmful components.

[0073] pH monitoring unit: real-time monitoring of the pH value of the alkali solution in the tower, and adjusting the amount of alkali solution added through the alkali solution addition control system to ensure the continuous and effective absorption process. The tail gas after absorption enters the tail gas treatment tower module.

[0074] S5: Tail gas treatment tower module removes organic matter and residual harmful components The exhaust gas treated by the absorption module enters the exhaust gas treatment tower module for further removal of organic matter and other residual harmful components to ensure that the final exhaust gas emissions meet environmental protection requirements.

[0075] Activated carbon adsorption tower: The tower is equipped with an activated carbon bed. The activated carbon has a large specific surface area and can effectively adsorb residual organic matter and other harmful components in the exhaust gas.

[0076] High-efficiency demisting unit: including demisting device and gas-liquid separator, used to remove water mist and liquid particles in the exhaust gas to ensure that the exhaust gas is more pure. The exhaust gas passing through the treatment tower is sent to the fan and emission module.

[0077] S6: Resource recovery module to recover by-products The useful by-products generated during the washing and absorption process are recovered through the resource recovery module, and the resources are efficiently utilized through the precipitation, filtration and crystallization processes.

[0078] Sedimentation tank: solid particles in the washing liquid are settled and collected to form slurry for further processing.

[0079] Filtration unit: includes a filter and a filter pump, which are used to further filter the precipitated liquid to remove fine solid particles and prevent clogging of the equipment during the subsequent crystallization process.

[0080] Crystallization unit: The filtered liquid is concentrated through the evaporator, and after reaching the supersaturated state, it is crystallized in the cooling crystallizer to recover by-products such as sodium chloride and calcium chloride, thereby maximizing resource utilization.

[0081] S7: The fan and the emission module meet the emission standards The exhaust gas passes through the fan and emission module for final emission that meets the standards. The fan and emission module consists of an induced draft fan, an exhaust chimney, and an exhaust gas online monitoring device.

[0082] Induced draft fan: transports the treated exhaust gas to the exhaust chimney to ensure that the exhaust gas can be discharged smoothly.

[0083] Exhaust chimney: The design height meets environmental protection standards to ensure that the exhaust gas can diffuse higher into the air, thereby reducing the impact on the surrounding environment.

[0084] Exhaust online monitoring device: used to monitor the concentration of pollutants in exhaust gas in real time to ensure that the exhaust gas emission concentration meets the requirements of environmental protection standards. If excessive emissions are detected, other response measures can be initiated in a timely manner.

[0085] S8: Control and safety module for monitoring and control The entire exhaust gas recovery system realizes the coordinated operation of each module through the control and safety module, which includes the PLC automatic control unit, alarm unit and emergency emission unit.

[0086] PLC automatic control unit: responsible for real-time collection of operating data of each module, including temperature, pressure, flow, etc. Based on the collected data, PLC performs logical operations and adjustments to keep each module in the best working state.

[0087] Alarm unit: When certain operating parameters exceed the preset range, the alarm unit uses sound and light alarms to remind operators to take measures to prevent accidents.

[0088] Emergency discharge unit: includes emergency discharge valve and safety pressure relief device. When serious abnormality occurs in the system, the exhaust gas is quickly discharged through the emergency discharge valve to ensure the safety of equipment and personnel.

[0089] Embodiment three: The third embodiment of the present invention is based on the same inventive concept and proposes a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps of the operating method of the tail gas recovery and utilization device of the chlorination furnace for high-purity quartz sand in the above-mentioned embodiment are implemented.

[0090] Embodiment 4: The fourth embodiment of the present invention is based on the same inventive concept. The present invention proposes a computer device, the terminal includes: a processor, a memory; the processor and the memory communicate with each other; the memory is used to store instructions; the processor is used to execute the instructions in the memory, and execute the operation method of the tail gas recovery and utilization device of the chlorination furnace for high-purity quartz sand in the above-mentioned embodiment.

[0091] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0092] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tail gas recovery and utilization device for a chlorination furnace for high-purity quartz sand, characterized in that: include: The exhaust gas cooling module is used to cool the high-temperature exhaust gas to a suitable temperature so that the exhaust gas can smoothly enter the dust removal module for further processing; The dust removal module is used to remove particulate matter from the exhaust gas, so that the exhaust gas reaches a lower particle concentration before entering the scrubber module; The scrubber module is used to treat the acidic components in the tail gas by spraying alkaline solution to reduce the acid gas content and make the tail gas components suitable for entering the absorption module for deep purification; The absorption module is used to further purify harmful gases in the tail gas to meet the emission standards and ensure that the processing load of the tail gas treatment tower module is reduced, so that the pollutant content of the tail gas reaches an appropriate level when it enters the tail gas treatment tower module; The tail gas treatment tower module is used to further purify the tail gas and remove organic matter and residual harmful components so that it can be finally discharged through the fan and emission module; Resource recovery module, used to recover useful substances generated during washing and absorption, and further concentrate and crystallize them to achieve efficient utilization of resources; The fan and exhaust module is used to ensure that the exhaust gas meets the emission standards and discharge the purified exhaust gas into the atmosphere, completing the final step of exhaust gas treatment; The control and safety module is used to monitor and control the operating status of each module and coordinate the operation between modules.

2. The tail gas recovery and utilization device of the chlorination furnace for high-purity quartz sand according to claim 1, characterized in that: The exhaust gas cooling module includes a heat exchanger and a cooling water circulation unit; The heat exchanger is a shell and tube heat exchanger or a plate heat exchanger, the cooling medium is water or air, and the heat exchanger cools the high-temperature exhaust gas through heat transfer of the medium; The cooling water circulation unit includes a cooling water circulation pump and a cooling water storage tank. The cooling water circulation pump allows the cooling water to flow continuously to maintain cooling.

3. The tail gas recovery and utilization device of the chlorination furnace for high-purity quartz sand according to claim 1, characterized in that: The dust removal module includes a bag dust collector or an electrostatic dust collector and a vibration dust cleaning unit; The bag filter includes filter bags, and regularly removes attached particulate matter through a vibrating cleaning unit. The electrostatic precipitator includes a high-voltage power supply and a dust collecting plate. The bag filter captures particulate matter in the exhaust gas through the filter bags and removes it through the vibrating cleaning unit. The electrostatic precipitator absorbs tiny particles through electrostatic action to ensure the removal of solid particles in the exhaust gas.

4. The tail gas recovery and utilization device of the chlorination furnace for high-purity quartz sand according to claim 1, characterized in that: The washing tower module includes a spray device, a packing layer, a circulating liquid pump and a liquid level control unit; The spray device includes a nozzle and a spray pipe, the packing layer is used to increase the gas-liquid contact area, the circulating liquid pump is used to circulate the washing liquid to the spray device, and the liquid level control unit includes a liquid level sensor and a control valve; the spray device sprays the alkaline solution into the exhaust gas through the nozzle, the packing layer provides a larger gas-liquid contact surface, and the liquid level control unit maintains the stability of the washing liquid level and the continuity of the washing process.

5. The tail gas recovery and utilization device of the chlorination furnace for high-purity quartz sand according to claim 1, characterized in that: The absorption module includes an alkali solution absorption tower, a nozzle and a pH monitoring unit; The alkali solution absorption tower is designed for multi-stage absorption, the nozzle is arranged in the alkali solution absorption tower for evenly distributing the alkali solution, and the pH monitoring unit includes a pH sensor and an alkali solution addition control system; the alkali solution absorption tower effectively removes harmful components in the tail gas through the multi-stage absorption structure, the nozzle evenly distributes the alkali solution, the pH monitoring unit monitors the pH value of the absorption liquid in real time, and adjusts the amount of alkali solution added through the alkali solution addition control system.

6. The tail gas recovery and utilization device of the chlorination furnace for high-purity quartz sand according to claim 1, characterized in that: The tail gas treatment tower module includes an activated carbon adsorption tower and a high-efficiency demisting unit; The activated carbon adsorption tower comprises an activated carbon bed and an adsorption tower shell, and the high-efficiency demisting unit comprises a demister and a gas-liquid separator; The activated carbon adsorption tower uses an activated carbon bed to adsorb organic matter and residual harmful components in the tail gas, and the high-efficiency demisting unit removes water mist in the tail gas through a demister and a gas-liquid separator; The resource recovery module consists of a sedimentation tank, a filtration unit and a crystallization unit; The sedimentation tank is used to separate solids from liquids, the filtration unit includes a filter and a filtration pump, the crystallization unit is used to concentrate and crystallize the solution in the sedimentation tank to recover high-purity chloride salt, and the crystallization unit includes an evaporator and a cooling crystallizer; The sedimentation tank separates the solid particles by gravity, the filtration unit further removes the tiny solid particles in the solution, and the crystallization unit recovers high-purity chloride salt through evaporation and cooling crystallization steps.

7. The tail gas recovery and utilization device of the chlorination furnace for high-purity quartz sand according to claim 1, characterized in that: The fan and exhaust module includes an induced draft fan, an exhaust chimney and an exhaust gas online monitoring unit; The induced draft fan is used to send the purified tail gas into the exhaust chimney, and the exhaust chimney is used to discharge the purified tail gas into the atmosphere. The tail gas online monitoring unit is used to monitor the pollutant concentration in the exhaust gas in real time; The control and safety module includes a PLC automatic control unit, an alarm unit and an emergency discharge unit. The PLC automatic control unit includes a programmable logic controller, the alarm unit includes an audible and visual alarm, the emergency discharge unit includes an emergency discharge valve and a safety pressure relief device, and includes a temperature sensor, a pressure sensor and a liquid level sensor; The PLC automatic control unit controls the operation of each module according to the sensor feedback information, the alarm unit issues an alarm when the parameter exceeds the limit, and the emergency emission unit is used to emit exhaust gas.

8. An operating method of a tail gas recovery and utilization device for a chlorination furnace for high-purity quartz sand, used for the tail gas recovery and utilization device for a chlorination furnace for high-purity quartz sand according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: The exhaust gas is cooled by the exhaust gas cooling module to cool the high-temperature exhaust gas to a suitable temperature; S2: The cooled exhaust gas enters the dust removal module, where particulate matter in the exhaust gas is removed by the dust collector, so that the exhaust gas reaches a lower particle concentration before entering the scrubber module; S3: The exhaust gas after dust removal enters the scrubber module, and the acidic components in the exhaust gas are treated by spraying alkaline solution to reduce the content of acidic gas; S4: The washed tail gas enters the absorption module and passes through the alkaline solution absorption tower to further remove harmful gases in the tail gas to meet the emission standards; S5: The tail gas treated by the absorption module enters the tail gas treatment tower module to further remove organic matter and residual harmful components in the tail gas; S6: The useful substances generated during washing and absorption are recovered through the resource recovery module and then utilized as resources through the processes of precipitation, filtration and crystallization; S7: The exhaust gas passes through the fan and the emission module to meet the emission standards, and the purified exhaust gas is discharged into the atmosphere; S8: Finally, the operating status of each module is monitored and controlled through the control and safety module.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the operating method of the tail gas recovery and utilization device of the chlorination furnace for high-purity quartz sand as claimed in claim 8 is implemented.

10. A readable storage medium, characterized in that: The readable storage medium stores a computer program, and when the computer program is executed by the processor, the operating method of the tail gas recovery and utilization device of the chlorination furnace for high-purity quartz sand as claimed in claim 8 is implemented.

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