An asphalt fume treatment management and control device

Abstract

The utility model belongs to the field of asphalt flue gas treatment relates to an asphalt flue gas treatment management and control device, and control unit connection sequence arrangement's air inlet shunt unit, caustic washing unit, capture focus unit and filter unit, and caustic washing unit includes caustic washing tower, and the inner bottom of caustic washing tower is caustic washing liquid pool, and the inner upper portion is caustic washing spray pipe, and the lower part lateral wall of caustic washing tower is caustic washing tower air inlet and caustic washing tower water inlet, and caustic washing tower air inlet is connected with caustic washing unit entrance, and caustic washing tower water inlet is connected with water supply inlet, and the top of caustic washing tower is caustic washing tower gas outlet, and the pressure interface of caustic washing differential pressure transmitter is connected respectively before caustic washing tower air inlet and after caustic washing tower gas outlet, and caustic washing tower bottom opening connects alkali inlet, and the lower portion of caustic washing liquid pool lateral wall is equipped with alkali circulation mouth, and alkali circulation mouth is connected caustic washing spray pipe through parallel first circulation branch and second circulation branch. The utility model part equipment adopts one main one spare design, and has improved equipment reliability and processing efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of asphalt fume treatment technology, and in particular relates to an asphalt fume treatment and control device. Background Technology

[0002] Asphalt loading fumes refer to the exhaust gases generated during the process of loading liquid hot asphalt from stationary storage tanks into transport tank trucks; asphalt storage tank fumes refer to the exhaust gases continuously generated during the static storage of hot asphalt in stationary tanks. Both types of asphalt fumes contain aerosol particles such as tar, various volatile organic compounds (VOCs), and hazardous air pollutants (HAPs).

[0003] An oil and gas recovery system is a device used for the closed-loop collection, storage, and recovery of volatile oil and gas during oil loading and unloading. It is widely used in gas stations, oil depots, and oil pipeline loading operations. Currently, oil and gas recovery systems are commonly used in factory production and tank truck loading and unloading to recover and treat asphalt fumes. However, asphalt fumes are low-concentration waste gases, and according to the "Technical Specification for Waste Gas Treatment Engineering in Petroleum Refining Industry," long-term use of oil and gas recovery systems for treating asphalt fumes is not suitable. This is mainly due to the following issues:

[0004] Oil and gas recovery processes typically include alkaline washing, condensation, and adsorption. However, asphalt fumes contain a large amount of tar. During the condensation process, coking easily occurs in the refrigeration pipes at temperatures ranging from -60°C to -75°C, causing pipe blockage, equipment damage, and reduced refrigeration efficiency. This results in a high failure rate, unstable operation, and increased maintenance costs for oil and gas recovery equipment. Summary of the Invention

[0005] To solve the above-mentioned technical problems, this utility model provides an asphalt fume treatment and control device. The technical solution adopted by this utility model is as follows:

[0006] An asphalt fume treatment and control device includes a control unit, which is electrically connected to an air inlet diversion unit, an alkaline washing unit, a coke trapping unit, and a filtration unit arranged in sequence. The alkaline washing unit includes an alkaline washing tower, with an alkaline washing liquid pool at the bottom and an alkaline washing spray pipe at the top. The lower side wall of the alkaline washing tower has an air inlet and a water inlet from top to bottom. The air inlet is connected to the inlet of the alkaline washing unit, and the water inlet is connected to the makeup water inlet. The top of the alkaline washing tower has an air outlet connected to the inlet of the coke trapping unit. One pressure port of an alkaline washing differential pressure transmitter is connected before the air inlet of the alkaline washing tower, and the other pressure port is connected after the air outlet of the alkaline washing tower. The bottom opening of the alkaline washing tower is connected to an alkaline liquid inlet. An alkaline liquid circulation port is provided on the lower side wall of the alkaline washing liquid pool. The alkaline liquid circulation port is connected to the alkaline washing spray pipe through a first circulation branch and a second circulation branch connected in parallel.

[0007] Preferably, the air intake diversion unit includes a storage tank flue gas inlet and a loading flue gas inlet. The storage tank flue gas inlet is connected to one end of a third pneumatic valve, and the other end of the third pneumatic valve is connected to one end of a first pneumatic valve. The loading flue gas inlet is connected to one end of the first pneumatic valve and one end of the second pneumatic valve. An inlet pressure transmitter and a combustible gas detector are installed on the pipeline between the third pneumatic valve and the first pneumatic valve. The other end of the first pneumatic valve is connected to the inlet of the alkaline washing unit. An alkaline washing inlet temperature transmitter is installed on the pipeline between the first pneumatic valve and the inlet of the alkaline washing unit. The other end of the second pneumatic valve is connected to one end of an oil and gas recovery shut-off valve. A first vent valve is connected in parallel on the pipeline between the second pneumatic valve and the oil and gas recovery shut-off valve. The other end of the oil and gas recovery shut-off valve is connected to the oil and gas recovery system.

[0008] Preferably, the coke-catching unit includes an electric coke catcher, the coke-catching unit inlet is connected to the electric coke-catching air inlet, and a coke-catching electric fire-prevention valve and a coke-catching unit inlet temperature transmitter are sequentially installed on the pipeline between the coke-catching unit inlet and the electric coke-catching air inlet. A coke-catching pressure transmitter, a coke-catching temperature transmitter and an insulation box temperature transmitter are installed on the upper part of the electric coke catcher. The coke-catching fire-prevention spray inlet on the upper part of the electric coke catcher is connected to the fire-prevention liquid supply port through two parallel coke-catching spray pipelines. A first coke-catching spray ball valve is installed on one branch coke-catching spray pipeline, and a second coke-catching spray ball valve, a coke-catching pneumatic valve and a third coke-catching spray ball valve are sequentially installed on the other coke-catching spray pipeline along the coke-catching spray liquid delivery direction.

[0009] Preferably, the filtration unit includes a filter-driven electric fire damper connected to the inlet of the filtration unit. The other end of the filter-driven electric fire damper is connected to a first filtration branch and a second filtration branch connected in parallel. The rear ends of the first and second filtration branches are connected to a chimney. The first filtration branch, along the gas flow direction, sequentially includes a wire mesh filter box, an activated carbon box, a fan, and a fan outlet butterfly valve. A first wire mesh butterfly valve is located at the inlet of the wire mesh filter box, and a second wire mesh butterfly valve is located at the outlet of the wire mesh filter box. A first activated carbon butterfly valve is located at the inlet of the activated carbon box, and a second activated carbon butterfly valve is located at the outlet of the activated carbon box. One pressure port of the activated carbon differential pressure transmitter is located between the first activated carbon butterfly valve and the activated carbon box inlet, and the other pressure port is located between the second activated carbon butterfly valve and the activated carbon box outlet. Between the activated carbon outlet temperature transmitter and the activated carbon box outlet, the activated carbon outlet temperature transmitter is installed. The activated carbon box is equipped with a fire sprinkler system. The fire sprinkler inlet of the activated carbon box is connected to the fire sprinkler supply port. The pipeline between the fire sprinkler supply port and the activated carbon box is sequentially equipped with a first filter spray ball valve, a filter spray pneumatic valve, and a second filter spray ball valve along the liquid flow direction. The second activated carbon butterfly valve is connected to the inlet of the fan. The fan outlet is equipped with a fan outlet butterfly valve, and the other end of the fan outlet butterfly valve is connected to the chimney. The two ends of the first cross-connector are respectively connected between the second wire mesh butterfly valve and the first activated carbon butterfly valve in the first filter branch and the second filter branch. The two ends of the second cross-connector are respectively connected between the second activated carbon butterfly valve and the fan in the first filter branch and the second filter branch.

[0010] Preferably, one end of the circulation inlet valve is connected to the alkali circulation port, and the other end of the circulation inlet valve is connected to the inlet of the alkali circulation pump. The outlet of the alkali circulation pump is connected to the front end of the liquid pump outlet check valve. The rear end of the liquid pump outlet check valve is connected to one end of the circulation outlet valve. The other end of the circulation outlet valve is connected to one end of the alkali washing spray valve. The other end of the alkali washing spray valve is connected to the alkali washing spray pipe. An alkali vent valve is connected to the pipeline between the outlet of the alkali circulation pump and the liquid pump outlet check valve. One end of a pressure gauge isolation valve is connected to the pipeline between the liquid pump outlet check valve and the circulation outlet valve. The other end of the pressure gauge isolation valve is connected to a field pressure gauge.

[0011] Preferably, the water supply inlet is connected to a water supply pipeline at its front end, and a water supply shut-off valve is connected to one end of the water supply inlet at its rear end. The other end of the water supply shut-off valve is connected to the water inlet of the alkaline washing tower through two parallel water supply pipelines. One water supply pipeline is equipped with a first water supply ball valve, and the other water supply pipeline is equipped with a second water supply ball valve, a water supply pneumatic valve, and a third water supply ball valve in sequence. A water supply pressure gauge is installed on the pipeline between the water supply shut-off valve and the second water supply ball valve.

[0012] Preferably, the alkali inlet is connected to the inlet of the main alkali replenishment pump and the inlet of the standby alkali replenishment pump, one end of the alkali replenishment ball valve is connected to the outlet of the main alkali replenishment pump and the outlet of the standby alkali replenishment pump, and the other end of the alkali replenishment ball valve is connected to the alkali washing liquid tank.

[0013] Preferably, a liquid level sensor and a pH sensor are installed at the alkaline washing solution tank.

[0014] Preferably, the lower part of the electrostatic precipitator is provided with a waste oil outlet, which is connected to a waste oil collection box. A waste oil outlet valve is provided on the pipeline between the waste oil outlet and the waste oil collection box, and a waste oil weighing meter is provided on the waste oil collection box.

[0015] Preferably, exhaust gas flow meters are installed on the pipelines between the rear end of the first filtration branch, the rear end of the second filtration branch, and the chimney.

[0016] The beneficial effects of this utility model are:

[0017] A new asphalt fume treatment and control device will be added to the existing oil and gas recovery equipment and connected to the inlet pipeline of the existing oil and gas recovery equipment, so that the environmental protection facilities are set up separately: one set of oil and gas recovery equipment and one set of asphalt fume treatment and control device. When the asphalt fume treatment and control device malfunctions or is under maintenance, the oil and gas recovery equipment can be used temporarily to complete a small amount of asphalt fume treatment.

[0018] The addition of an LEL online analysis system to the flue gas inlet duct improved the safety of the unit's operation.

[0019] Some equipment in the filtration unit and alkaline washing unit adopts a main and backup design. When the main equipment fails or is under maintenance, the backup equipment can be started seamlessly without interrupting the overall operation, which improves the reliability and processing efficiency of the equipment.

[0020] Each sensor and pneumatic valve is electrically or wirelessly connected to the control unit to monitor and manage the operation of the device. Through data acquisition, control, and centralized monitoring and management, the main parameters are controlled, recorded, displayed, and alarmed. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the asphalt fume treatment and control device according to an embodiment of the present utility model;

[0022] Figure 2 This is a schematic diagram of the intake splitter unit according to an embodiment of the present utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the alkaline washing unit in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the coking unit according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the filter unit in an embodiment of the present invention;

[0026] Among them, 101 is the storage tank flue gas inlet, 102 is the loading flue gas inlet, 103 is the first pneumatic valve, 104 is the second pneumatic valve, 105 is the third pneumatic valve, 106 is the inlet pressure transmitter, 107 is the combustible gas detector, 108 is the alkaline wash inlet temperature transmitter, 109 is the oil and gas recovery shut-off valve, and 110 is the first vent valve.

[0027] 201 is the air inlet of the alkali washing tower; 202 is the air outlet of the alkali washing tower; 203 is the alkali washing differential pressure transmitter; 204 is the alkali washing liquid tank; 205 is the first alkali washing spray pipe; 206 is the second alkali washing spray pipe; 207 is the main alkali solution replenishment pump; 208 is the standby alkali solution replenishment pump; 209 is the alkali solution replenishment ball valve; 210 is the water replenishment shut-off valve; 211 is the first water replenishment ball valve; 212 is the second water replenishment ball valve; 213 is the third water replenishment ball valve; 214 is the water replenishment pneumatic valve; 215 is the water replenishment pressure gauge. Table 216 shows the inlet of the alkali washing tower; 217 shows the alkali circulation port; 218 shows the circulation inlet valve; 219 shows the alkali circulation pump; 220 shows the alkali vent valve; 221 shows the pump outlet check valve; 222 shows the circulation outlet valve; 223 shows the pressure gauge isolation valve; 224 shows the density sensor; 225 shows the first alkali washing spray valve; 226 shows the second alkali washing spray valve; 227 shows the liquid level sensor; 228 shows the pH sensor; 229 shows the field pressure gauge; and 230 shows the pump outlet pneumatic valve.

[0028] 301 is the coke-catching electric fireproof valve; 302 is the coke-catching unit inlet temperature transmitter; 303 is the electric coke-catching air inlet; 304 is the electric coke-catching air outlet; 305 is the waste oil outlet; 306 is the waste oil outlet valve; 307 is the waste oil collection tank; 308 is the waste oil weighing gauge; 309 is the first coke-catching spray ball valve; 310 is the second coke-catching spray ball valve; 311 is the third coke-catching spray ball valve; 312 is the coke-catching spray pneumatic valve; 313 is the coke-catching fireproof spray inlet; 314 is the coke-catching pressure transmitter; 315 is the coke-catching temperature transmitter; 316 is the insulation box temperature transmitter.

[0029] 401 is a filter electric fire damper; 402 is a wire mesh filter box; 402a is the first wire mesh butterfly valve; 402b is the second wire mesh butterfly valve; 403 is an activated carbon box; 403a is the first activated carbon butterfly valve; 403b is the second activated carbon butterfly valve; 404 is a fan; 405 is the fan outlet butterfly valve; 406 is an activated carbon differential pressure transmitter; 407 is an activated carbon outlet temperature transmitter; 408 is a waste gas flow meter; 409 is the first crossover pipe; 410 is the second crossover pipe; 411 is the first filter spray ball valve; 412 is the second filter spray ball valve; and 413 is a filter spray pneumatic valve. Detailed Implementation

[0030] Unless otherwise stated, the term "connection" as used hereafter refers to "connection via a pipe".

[0031] like Figure 1 As shown, an asphalt fume treatment and control device includes: an air intake diversion unit, an alkaline washing unit, a coke trapping unit, a filtration unit, and a control unit.

[0032] The control unit can specifically be a combination of existing products such as industrial control computers and PLCs.

[0033] like Figure 2 As shown, the air intake diversion unit includes: a storage tank flue gas inlet 101 and a loading flue gas inlet 102. The storage tank flue gas inlet 101 is connected to one end of a third pneumatic valve 105, and the other end of the third pneumatic valve 105 is connected to one end of a first pneumatic valve 103. The loading flue gas inlet 102 is connected to one end of the first pneumatic valve 103 and one end of the second pneumatic valve 104, respectively. An inlet pressure transmitter 106 and a combustible gas detector 107 are installed on the pipeline between the third pneumatic valve 105 and the first pneumatic valve 103.

[0034] The combustible gas detector 107 is electrically connected to the first pneumatic valve 103 and the second pneumatic valve 104 or wirelessly connected (the dashed line represents wireless communication) to control the opening and closing of the first pneumatic valve 103 and the second pneumatic valve 104.

[0035] The other end of the first pneumatic valve 103 is connected to the inlet of the alkaline washing unit, and an alkaline washing inlet temperature transmitter 108 is installed on the pipeline between the first pneumatic valve 103 and the inlet of the alkaline washing unit. The other end of the second pneumatic valve 104 is connected to one end of the oil and gas recovery shut-off valve 109, and a first vent valve 110 is also connected in parallel on the pipeline between the second pneumatic valve 104 and the oil and gas recovery shut-off valve 109. The other end of the oil and gas recovery shut-off valve 109 is connected to the oil and gas recovery system.

[0036] The inlet pressure transmitter 106 is used to monitor the pipeline air pressure. The control unit will adjust the operation of the fan according to the pipeline air pressure. For example, if the air pressure threshold is set to -150Pa, the fan 404 will stop running when the inlet pressure transmitter 106 detects that the pipeline pressure is <-150Pa, and the fan 404 will resume normal operation when the pipeline pressure is ≥-150Pa.

[0037] The combustible gas detector 107 is an online LEL (Lower Explosive Limit) analyzer, which can detect the concentration of combustible gas in the pipeline in real time and is interlocked with the first pneumatic valve 103 and the second pneumatic valve 104. When the concentration of combustible gas in the asphalt fumes does not reach the limit, the asphalt fumes are sent to the alkaline washing unit for further treatment; otherwise, the asphalt fumes are sent to the original oil and gas recovery system for treatment.

[0038] For example, if the combustible gas concentration is set to 25%, when the combustible gas detector 107 detects that the concentration exceeds the limit of 25%, the first pneumatic valve 103 is closed, the second pneumatic valve 104 is opened, and the oil and gas recovery system is started; if the combustible gas concentration in the asphalt fumes is detected to be lower than 25%, the second pneumatic valve 104 is closed, the oil and gas recovery system is shut down, and the first pneumatic valve 103 is opened.

[0039] During maintenance and repair of the intake splitter unit, the first vent valve 110 can be manually opened to vent the small amount of asphalt fumes remaining in the pipeline.

[0040] like Figure 3 As shown, the alkaline washing unit includes an alkaline washing tower. The air inlet 201 on the lower side wall of the alkaline washing tower is connected to the inlet of the alkaline washing unit, allowing asphalt fumes to enter the tower. The top of the alkaline washing tower has an air outlet 202, from which the asphalt fumes exit the tower after alkaline washing. The air outlet 202 is connected to the inlet of the coke trapping unit. One pressure port of the alkaline washing differential pressure transmitter 203 is connected before the air inlet 201, and the other pressure port is connected after the air outlet 202. The alkaline washing differential pressure transmitter 203 is used to monitor whether asphalt fumes are being introduced into the alkaline washing unit; if so, the alkaline washing circulation spray is activated.

[0041] The bottom of the alkaline washing tower contains an alkaline washing liquid tank 204, which provides alkaline washing liquid for circulating spraying and collects the alkaline washing liquid that has absorbed acidic gases for recycling. The middle section of the alkaline washing tower contains the first alkaline washing spray pipe 205, and the upper section contains the second alkaline washing spray pipe 206, used for spraying alkaline washing liquid, thus spraying the asphalt fumes in layers.

[0042] The alkali inlet is connected to the inlet of the main alkali replenishment pump 207 and the standby alkali replenishment pump 208. One end of the alkali replenishment ball valve 209 is connected to the outlet of the main alkali replenishment pump 207 and the standby alkali replenishment pump 208, and the other end of the alkali replenishment ball valve 209 is connected to the alkali washing solution tank 204. The alkali inlet is used to provide high-concentration alkali solution, for example, the front end of the alkali inlet is connected to an alkali tank or an alkali delivery pipeline. When the pH value of the alkali solution is too low, alkali replenishment is performed, that is, opening the alkali replenishment ball valve 209 and one of the main alkali replenishment pumps 207 and 208, which can replenish high-concentration alkali solution to the alkali washing solution tank 204 and increase the pH value of the alkali solution. The main alkali replenishment pump 207 and the standby alkali replenishment pump 208 are set up in a "one main, one standby" configuration. Normally, the main alkali replenishment pump 207 is used. When the main alkali replenishment pump 207 fails or is under maintenance, the standby alkali replenishment pump 208 is activated.

[0043] The water supply inlet is connected to a water supply pipeline and is used to dilute the alkaline washing solution when the pH value is too high. The water supply inlet is connected to one end of a water supply shut-off valve 210. The other end of the water supply shut-off valve 210 is connected to the alkaline washing tower inlet 216 via two parallel water supply pipelines. One of the two parallel water supply pipelines is equipped with a first water supply ball valve 211, and the other pipeline is sequentially equipped with a second water supply ball valve 212, a water supply pneumatic valve 214, and a third water supply ball valve 213. A water supply pressure gauge 215 is installed on the pipeline between the water supply shut-off valve 210 and the second water supply ball valve 212.

[0044] When the water supply pressure gauge 215 detects an abnormal pressure, manually close the water supply shut-off valve 210 to isolate the water supply inlet.

[0045] Alkaline washing water replenishment is usually controlled automatically. The first water replenishment ball valve 211 is normally closed, and the second water replenishment ball valve 212 and the third water replenishment ball valve 213 are normally open. The control unit controls the opening and closing of the water replenishment pneumatic valve 214 to replenish water. In special cases, such as when it is necessary to inspect and repair the water replenishment pneumatic valve 214, manual alkaline washing water replenishment can be switched. The second water replenishment ball valve 212 and the third water replenishment ball valve 213 are closed, thereby isolating the water replenishment pneumatic valve 214. The first water replenishment ball valve 211 is then manually opened to replenish water. This ensures that normal water replenishment is not affected when the water replenishment pneumatic valve 214 is being maintained or inspected.

[0046] The alkaline washing tank 204 of the alkaline washing tower has an alkaline liquid circulation port 217 on the lower part of its side wall. The alkaline washing liquid enters the alkaline washing circulation through the alkaline liquid circulation port 217 and completes the spraying. The alkaline liquid circulation port 217 is connected to a first circulation branch and a second circulation branch that are connected in parallel.

[0047] The first circulation branch has a circulation inlet valve 218 at its front end. One end of the circulation inlet valve 218 is connected to the alkali circulation port 217, and the other end is connected to the inlet of the alkali circulation pump 219. The outlet of the alkali circulation pump 219 is connected to the front end of the liquid pump outlet check valve 221. The rear end of the liquid pump outlet check valve 221 is connected to one end of the circulation outlet valve 222. The other end of the circulation outlet valve 222 is connected to one end of the first alkali washing spray valve 225 and one end of the second alkali washing spray valve 226. The other end of the first alkali washing spray valve 225 is connected to the first alkali washing spray pipe 205, and the other end of the second alkali washing spray valve 226 is connected to the second alkali washing spray pipe 206. An alkali vent valve 220 is connected to the pipeline between the outlet of the alkali circulation pump 219 and the liquid pump outlet check valve 221. One end of a pressure gauge isolation valve 223 is connected to the pipeline between the liquid pump outlet check valve 221 and the circulation outlet valve 222, and the other end of the pressure gauge isolation valve 223 is connected to the field pressure gauge 229.

[0048] The field pressure gauge 229 is used to monitor the hydraulic pressure of the first circulation branch in real time. When the field pressure gauge 229 needs maintenance and repair, the pressure gauge isolation valve 223 is closed so that the maintenance and repair of the field pressure gauge 229 will not affect other equipment.

[0049] Alkaline washing solution that is used for a long time needs to be completely drained and replaced regularly. When it is necessary to drain the alkaline washing solution, the alkaline washing solution in the alkaline washing solution tank 204 can be drained by opening the alkaline washing solution vent valve 220 and the alkaline washing solution circulation pump 219.

[0050] The only difference between the second circulation branch and the first circulation branch is that the second circulation branch replaces the liquid pump outlet check valve 221 with a liquid pump outlet pneumatic valve 230. All other components and connections are identical to the first circulation branch. This design takes into account that if both circulation branches use check valves (where fluid can only pass through in one direction), and the alkali vent valve 220 is located before the check valves, the alkali washing liquid in the pipe section after the check valves cannot be effectively drained. Therefore, this invention replaces the check valve 221 in the second circulation branch with the liquid pump outlet pneumatic valve 230. The pneumatic valve allows liquid backflow; when the alkali washing liquid needs to be drained, opening the liquid pump outlet pneumatic valve 230 in the second circulation branch allows for complete drainage of the alkali washing liquid.

[0051] During alkaline washing and circulating spraying, the first circulation branch is mainly used. The circulation inlet valve 218, alkaline solution circulation pump 219, pump outlet check valve 221, and circulation outlet valve 222 are opened. The alkaline solution circulation pump 219 pumps the alkaline washing solution upwards to the first alkaline washing spray pipe 205 and the second alkaline washing spray pipe 206 to complete the alkaline washing spraying. The check valve 221 effectively prevents the alkaline washing solution from flowing back. When the first circulation branch is under maintenance, the second circulation branch can be temporarily used to complete the alkaline washing spraying. When a large amount of spraying is required, both the first and second circulation branches can be opened and used simultaneously.

[0052] A liquid level sensor 227 and a pH sensor 228 are installed at the alkaline washing liquid pool 204 inside the alkaline washing tower, which are used to monitor the liquid level and pH value of the alkaline washing liquid, respectively.

[0053] If the pH of the alkaline washing solution is low but the liquid level is within the normal range, alkaline solution replenishment will be initiated to raise the pH to a suitable range. If the alkaline washing solution level is low, alkaline washing water replenishment will be performed, while simultaneously monitoring the pH of the alkaline washing solution. If water replenishment causes the pH to remain low, alkaline solution replenishment will be initiated again to raise the pH to a suitable range. If the pH of the alkaline washing solution is low and the liquid level is high, and the pH cannot be adjusted by replenishing alkaline solution, the control unit will prompt the operator to drain the alkaline solution. If the alkaline washing solution level reaches the minimum or maximum limit, the alkaline washing circulation spray will stop, and the control unit will issue an alarm.

[0054] like Figure 4As shown, the coke-catching unit includes an electric coke precipitator, which is a coke oven gas primary cooling device that uses a high-voltage DC electric field to separate tar droplets and gas. It is an existing device, and the coke-catching elements and fire-prevention spray equipment inside the electric coke precipitator can be obtained from publicly available information, so they will not be described in detail here.

[0055] The coke-catching unit inlet is connected to the electric coke-catching air inlet 303, and a coke-catching electric fire damper 301 and a coke-catching unit inlet temperature transmitter 302 are sequentially installed on the pipeline between the coke-catching unit inlet and the electric coke-catching air inlet 303. When the coke-catching unit inlet temperature transmitter 302 detects that the gas temperature is too high, the coke-catching electric fire damper 301 is activated and quickly cuts off the asphalt fumes to prevent a fire.

[0056] Asphalt fumes enter the electrostatic precipitator through the electrostatic precipitator inlet 303, and after passing through the electrostatic precipitator outlet 304, they are discharged and sent to the filter unit inlet.

[0057] The lower part of the electrostatic precipitator is provided with a waste oil outlet 305, which is connected to a waste oil collection box 307. A waste oil outlet valve 306 is provided on the pipeline between the waste oil outlet 305 and the waste oil collection box 307. A waste oil weighing meter 308 is provided on the waste oil collection box 307.

[0058] Waste tar captured by the electrostatic precipitator accumulates at the bottom of the precipitator and flows out from waste oil outlet 305 to waste oil collection tank 307 for collection. Waste oil weighing meter 308 detects the weight of the currently collected waste tar. When the weight of waste tar reaches a set threshold, it sends a signal to the control unit to remind the staff to clean or replace waste oil collection tank 307. At this time, the staff closes waste oil outlet valve 306 to perform cleaning or replacement, and then opens waste oil outlet valve 306 again after completion.

[0059] The upper part of the electric coke precipitator is equipped with a coke precipitator pressure transmitter 314 and a coke precipitator temperature transmitter 315, which are used to monitor the internal pressure and temperature of the electric coke precipitator, respectively. An insulation box temperature transmitter 316 is also installed on the upper part of the electric coke precipitator to monitor the temperature of the insulation box. When the internal temperature, pressure, or insulation box temperature of the electric coke precipitator exceeds a set threshold, a high fire risk is identified. At this time, the fire sprinkler system inside the electric coke precipitator will be activated to extinguish the fire; simultaneously, the electric fire damper 301 for coke precipitator and the electric fire damper for filter will close to prevent the fire from spreading along the pipeline to other units.

[0060] The coke-catching fire prevention spray inlet 313 at the top of the electric coke precipitator is connected to the fire prevention liquid supply port through two parallel coke-catching spray pipelines. One branch of the "coke-catching spray pipeline" is equipped with a first coke-catching spray ball valve 309, and the other branch is equipped with a second coke-catching spray ball valve 310, a coke-catching spray pneumatic valve 312 and a third coke-catching spray ball valve 311 in sequence along the coke-catching spray liquid conveying direction.

[0061] The fire-resistant liquid supply port can be supplied with water and nitrogen in accordance with the "International Standard for Automatic Sprinkler Systems NFPA 13". Nitrogen is used as the driving medium to push water out of the nozzles of the sprinkler equipment, forming a water mist to suppress the fire or rapidly cool it down.

[0062] like Figure 5 As shown, the filtration unit includes a filter-operated electric fire damper 401 connected to the rear of the filtration unit inlet. The other end of the filter-operated electric fire damper 401 is connected to a first filtration branch and a second filtration branch connected in parallel. The rear ends of the first filtration branch and the second filtration branch are connected to the chimney. An exhaust gas flow meter 408 is installed on the pipeline between the rear ends of the first filtration branch and the rear ends of the second filtration branch and the chimney.

[0063] The first filtration branch is provided with a wire mesh filter box 402, an activated carbon box 403, a fan 404, and a fan outlet butterfly valve 405 in sequence along the gas flow direction.

[0064] A first wire mesh butterfly valve 402a is installed at the inlet of the wire mesh filter box 402, and a second wire mesh butterfly valve 402b is installed at the outlet of the wire mesh filter box 402. The wire mesh filter box 402 is existing equipment and can intercept and capture residual asphalt tar in the exhaust gas. During maintenance, the wire mesh filter box 402 can be isolated by closing the first wire mesh butterfly valve 402a and the second wire mesh butterfly valve 402b before and after the wire mesh filter box 402.

[0065] A first activated carbon butterfly valve 403a is installed at the inlet of the activated carbon box 403, and a second activated carbon butterfly valve 403b is installed at the outlet of the activated carbon box 403. One pressure port of the activated carbon differential pressure transmitter 406 is located between the first activated carbon butterfly valve 403a and the inlet of the activated carbon box 403, and the other pressure port is located between the second activated carbon butterfly valve 403b and the outlet of the activated carbon box 403. An activated carbon outlet temperature transmitter 407 is located between the second activated carbon butterfly valve 403b and the outlet of the activated carbon box 403.

[0066] The activated carbon box 403 is existing equipment, containing honeycomb activated carbon that adsorbs VOCs from waste gas through its highly microporous structure. The activated carbon differential pressure transmitter 406 monitors the pressure difference across the activated carbon box 403. Abnormal pressure differences during filtration typically indicate a decline in the adsorption capacity of the activated carbon after long-term use, and the control unit will alert personnel to perform equipment maintenance. During maintenance, closing the first activated carbon butterfly valve 403a and the second activated carbon butterfly valve 403b across the activated carbon box 403 will isolate the wire mesh filter box 402.

[0067] The activated carbon box 403 is also equipped with a fire-prevention spraying device. The fire-prevention spraying inlet of the activated carbon box 403 is connected to the fire-prevention liquid supply port. The pipeline between the fire-prevention liquid supply port and the activated carbon box 403 is sequentially equipped with a first filter spraying ball valve 411, a filter spraying pneumatic valve 413 and a second filter spraying ball valve 412 along the liquid flow direction.

[0068] Because the activated carbon box 403 can absorb more combustibles, it is more prone to spontaneous combustion. The activated carbon outlet temperature transmitter 407 monitors the outlet gas temperature of the activated carbon box 403 in real time. When the temperature is abnormally high, it issues a high fire risk alarm and opens the filter spray pneumatic valve 413 to spray for fire extinguishing or cooling.

[0069] The second activated carbon butterfly valve 403b is connected to the inlet of the blower 404. The blower 404 has an outlet butterfly valve 405, the other end of which is connected to the chimney. The blower 404 provides the driving force for the gas flow in the filter unit through negative pressure suction. During maintenance and repair of the blower 404, closing the second activated carbon butterfly valve 403b and the outlet butterfly valve 405 will isolate the blower 404.

[0070] The equipment and connections of the second filtration branch are exactly the same as those of the first filtration branch.

[0071] The two ends of the first cross-connector 409 are respectively connected between the second wire mesh butterfly valve 402b and the first activated carbon butterfly valve 403a in the first filter branch and the second filter branch. The two ends of the second cross-connector 410 are respectively connected between the second activated carbon butterfly valve 403b and the blower 404 in the first filter branch and the second filter branch.

[0072] When performing filtration, the first filtration branch and the fan 404 of the first filtration branch are turned on. Driven by the fan 404, the asphalt fumes pass through the wire mesh filter box 402 and the activated carbon box 403 in sequence, and are filtered and sent into the chimney or exhaust stack for emission in compliance with standards.

[0073] When performing isolated maintenance on a single piece of equipment, asphalt fumes can bypass the isolated equipment through the first span pipe 409 or the second span pipe 410 because two symmetrical filter branches are set up. Therefore, the normal filtration of the filter unit will not be affected when any single piece of equipment is isolated for maintenance.

[0074] In this embodiment of the utility model, all technical features not described in detail are existing technologies or conventional technical means, and will not be repeated here.

[0075] Finally, it should be noted that the above embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model.

Claims

1. An asphalt fume treatment and control device, comprising a control unit, characterized in that, The control unit is electrically connected to the air intake diversion unit, alkaline washing unit, coke catching unit, and filtration unit arranged in sequence. The alkaline washing unit includes an alkaline washing tower, with an alkaline washing liquid pool at the bottom and an alkaline washing spray pipe at the top. The lower side wall of the alkaline washing tower has an air inlet and a water inlet from top to bottom. The air inlet is connected to the inlet of the alkaline washing unit, and the water inlet is connected to the makeup water inlet. The top of the alkaline washing tower has an air outlet connected to the inlet of the coke catching unit. One pressure port of the alkaline washing differential pressure transmitter is connected before the air inlet of the alkaline washing tower, and the other pressure port is connected after the air outlet of the alkaline washing tower. The bottom opening of the alkaline washing tower is connected to the alkaline liquid inlet. An alkaline liquid circulation port is provided on the lower side wall of the alkaline washing liquid pool. The alkaline liquid circulation port is connected to the alkaline washing spray pipe through a first circulation branch and a second circulation branch connected in parallel.

2. The asphalt fume treatment and control device according to claim 1, characterized in that, The air intake diversion unit includes a storage tank flue gas inlet and a loading flue gas inlet. The storage tank flue gas inlet is connected to one end of a third pneumatic valve, and the other end of the third pneumatic valve is connected to one end of a first pneumatic valve. The loading flue gas inlet is connected to one end of the first pneumatic valve and one end of the second pneumatic valve. An inlet pressure transmitter and a combustible gas detector are installed on the pipeline between the third pneumatic valve and the first pneumatic valve. The other end of the first pneumatic valve is connected to the inlet of the alkaline washing unit. An alkaline washing inlet temperature transmitter is installed on the pipeline between the first pneumatic valve and the alkaline washing unit inlet. The other end of the second pneumatic valve is connected to one end of an oil and gas recovery shut-off valve. A first vent valve is connected in parallel on the pipeline between the second pneumatic valve and the oil and gas recovery shut-off valve. The other end of the oil and gas recovery shut-off valve is connected to the oil and gas recovery system.

3. The asphalt fume treatment and control device according to claim 1, characterized in that, The coke-catching unit includes an electric coke catcher. The coke-catching unit inlet is connected to the electric coke-catching air inlet. A coke-catching electric fire-prevention valve and a coke-catching unit inlet temperature transmitter are sequentially installed on the pipeline between the coke-catching unit inlet and the electric coke-catching air inlet. A coke-catching pressure transmitter, a coke-catching temperature transmitter, and an insulation box temperature transmitter are installed on the upper part of the electric coke catcher. The coke-catching fire-prevention spray inlet on the upper part of the electric coke catcher is connected to the fire-prevention liquid supply port through two parallel coke-catching spray pipelines. A first coke-catching spray ball valve is installed on one branch coke-catching spray pipeline, and a second coke-catching spray ball valve, a coke-catching pneumatic valve, and a third coke-catching spray ball valve are sequentially installed on the other coke-catching spray pipeline along the coke-catching spray liquid delivery direction.

4. The asphalt fume treatment and control device according to claim 1, characterized in that, The filtration unit includes a filter-operated electric fire damper connected to the inlet of the filtration unit. The other end of the filter-operated electric fire damper is connected to a first filtration branch and a second filtration branch connected in parallel. The rear ends of the first and second filtration branches are connected to a chimney. The first filtration branch, along the gas flow direction, sequentially includes a wire mesh filter box, an activated carbon box, a fan, and a fan outlet butterfly valve. A first wire mesh butterfly valve is located at the inlet of the wire mesh filter box, and a second wire mesh butterfly valve is located at the outlet of the wire mesh filter box. A first activated carbon butterfly valve is located at the inlet of the activated carbon box, and a second activated carbon butterfly valve is located at the outlet of the activated carbon box. One pressure port of the activated carbon differential pressure transmitter is located between the first activated carbon butterfly valve and the activated carbon box inlet, and the other pressure port is located between the second activated carbon butterfly valve and the activated carbon box outlet. An activated carbon outlet temperature transmitter is installed between the second activated carbon butterfly valve and the activated carbon box outlet. The activated carbon box is equipped with a fire-resistant spray system. The fire-resistant spray inlet of the activated carbon box is connected to the fire-resistant liquid supply port. A first filter spray ball valve, a filter spray pneumatic valve, and a second filter spray ball valve are sequentially installed along the liquid flow direction on the pipeline between the fire-resistant liquid supply port and the activated carbon box. The second activated carbon butterfly valve is connected to the inlet of the fan. A fan outlet butterfly valve is installed at the fan outlet, and the other end of the fan outlet butterfly valve is connected to the chimney. The two ends of the first cross-connector are respectively connected between the second wire mesh butterfly valve and the first activated carbon butterfly valve in the first filter branch and the second filter branch. The two ends of the second cross-connector are respectively connected between the second activated carbon butterfly valve and the fan in the first filter branch and the second filter branch.

5. The asphalt fume treatment and control device according to claim 1, characterized in that, One end of the circulation inlet valve is connected to the alkali circulation port, and the other end is connected to the inlet of the alkali circulation pump. The outlet of the alkali circulation pump is connected to the front end of the liquid pump outlet check valve. The rear end of the liquid pump outlet check valve is connected to one end of the circulation outlet valve. The other end of the circulation outlet valve is connected to one end of the alkali washing spray valve. The other end of the alkali washing spray valve is connected to the alkali washing spray pipe. An alkali vent valve is connected to the pipeline between the outlet of the alkali circulation pump and the liquid pump outlet check valve. One end of a pressure gauge isolation valve is connected to the pipeline between the liquid pump outlet check valve and the circulation outlet valve. The other end of the pressure gauge isolation valve is connected to a field pressure gauge.

6. The asphalt fume treatment and control device according to claim 5, characterized in that, The water supply inlet is connected to the water supply pipeline at the front end and to one end of the water supply shut-off valve at the rear end. The other end of the water supply shut-off valve is connected to the water inlet of the alkaline washing tower through two parallel water supply pipelines. One water supply pipeline is equipped with a first water supply ball valve, and the other water supply pipeline is equipped with a second water supply ball valve, a water supply pneumatic valve, and a third water supply ball valve in sequence. A water supply pressure gauge is installed on the pipeline between the water supply shut-off valve and the second water supply ball valve.

7. The asphalt fume treatment and control device according to claim 6, characterized in that, The alkali inlet is connected to the inlet of the main alkali replenishment pump and the inlet of the standby alkali replenishment pump. One end of the alkali replenishment ball valve is connected to the outlet of the main alkali replenishment pump and the outlet of the standby alkali replenishment pump, and the other end of the alkali replenishment ball valve is connected to the alkali washing solution tank.

8. The asphalt fume treatment and control device according to claim 7, characterized in that, A level sensor and a pH sensor are installed at the alkaline washing solution tank.

9. The asphalt fume treatment and control device according to claim 3, characterized in that, The lower part of the electrostatic precipitator is equipped with a waste oil outlet, which is connected to a waste oil collection box. A waste oil outlet valve is installed on the pipeline between the waste oil outlet and the waste oil collection box, and a waste oil weighing meter is installed on the waste oil collection box.

10. The asphalt fume treatment and control device according to claim 4, characterized in that, Waste gas flow meters are installed on the pipelines between the rear end of the first filtration branch, the rear end of the second filtration branch, and the chimney.

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