Intelligent control device and control method for asphalt flue gas treatment

Abstract

The invention belongs to the field of asphalt flue gas treatment, and relates to an intelligent control device and method for asphalt flue gas treatment. In the management and control device, a control unit is connected with a gas inlet shunting unit, an alkali washing unit, a coke catching unit and a filtering unit, the alkali washing unit comprises an alkali washing tower, the bottom in the alkali washing tower is an alkali washing liquid pool, the upper part in the alkali washing tower is an alkali washing spraying pipe, the side wall of the lower part of the alkali washing tower is an alkali washing tower gas inlet and an alkali washing tower water inlet, and the top of the alkali washing tower is an alkali washing tower gas outlet; the gas inlet shunting unit comprises a storage tank flue gas inlet and a loading flue gas inlet, and the coke catching unit comprises an electric coke catcher. In the management and control method, a part of equipment adopts a one-main and one-standby design, so that the reliability and the processing efficiency of the equipment are improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of asphalt fume treatment, and particularly relates to an intelligent management and control device and method for asphalt fume treatment. BACKGROUND

[0002] Asphalt loading fume refers to waste gas generated in the process of loading liquid hot asphalt from a fixed storage tank to a transport tank truck; asphalt storage tank fume refers to waste gas continuously generated in the storage of hot asphalt in a fixed storage tank. The two kinds of asphalt fumes both contain aerosol particles such as tar, various volatile organic compounds (VOCs) and harmful air pollutants (HAPs).

[0003] An oil gas recovery system is a device for collecting, storing and recycling volatile oil gas in the process of loading and unloading oil products, and is widely used in work sites such as gas stations, oil depots and oil pipe loading. At present, an oil gas recovery system is usually used to recover and dispose asphalt fume in factory production and tank truck loading and unloading. However, asphalt fume is low-concentration waste gas, and according to the Technical Code for Waste Gas Treatment Engineering of Petroleum Refining Industry, it is not suitable for long-term treatment of asphalt fume by using an oil gas recovery system, which is mainly due to the following problems: The oil gas recovery treatment process usually includes alkaline washing, condensation and adsorption links, and asphalt fume contains a large amount of tar. In the condensation link, the refrigeration pipe in the temperature range of -60℃ to -75℃ is easy to coke, causing pipeline blockage, equipment damage and reduction of refrigeration efficiency, resulting in high failure rate of oil gas recovery equipment, unstable operation and increased maintenance cost. SUMMARY

[0004] In order to solve the above technical problems, the present application provides an intelligent management and control device and method for asphalt fume treatment. The technical solution adopted by the present application is as follows: The application discloses an asphalt fume treatment intelligent management and control device, which comprises a control unit, an air inlet shunting unit, an alkali washing unit, a coke capturing unit and a filtering unit which are sequentially arranged and electrically connected with the control unit respectively, wherein the air inlet shunting unit comprises a storage tank fume inlet and a loading fume inlet, the coke capturing unit comprises an electric coke capturing device, the alkali washing unit comprises an alkali washing tower, the bottom of the alkali washing tower is an alkali washing liquid pool, the upper part of the alkali washing tower is an alkali washing spraying pipe, the side wall of the lower part of the alkali washing tower is provided with an alkali washing tower air inlet and an alkali washing tower water inlet from top to bottom, the alkali washing tower air inlet is connected with the inlet of the alkali washing unit, the alkali washing tower water inlet is connected with a water supplement inlet, the top of the alkali washing tower is provided with an alkali washing tower gas outlet connected with the inlet of the coke capturing unit, one pressure interface of an alkali washing differential pressure transmitter is connected before the alkali washing tower air inlet, the other pressure interface of the alkali washing differential pressure transmitter is connected after the alkali washing tower gas outlet, the bottom of the alkali washing tower is provided with an alkali liquid inlet, the side wall of the alkali washing liquid pool is provided with an alkali liquid circulation port, and the alkali liquid circulation port is connected with the alkali washing spraying pipe through a first circulation branch and a second circulation branch which are connected with each other in parallel; the filtering unit comprises a filtering electric fireproof valve connected behind the inlet of the filtering unit, the filtering electric fireproof valve is connected with a first filtering branch and a second filtering branch which are connected with each other in parallel at the other end of the filtering electric fireproof valve, the rear end of the first filtering branch and the rear end of the second filtering branch are connected with a chimney, the first filtering branch is sequentially provided with a wire mesh filtering box, an activated carbon box, a fan and a fan outlet butterfly valve along the gas flow direction, the inlet of the wire mesh filtering box is provided with a first wire mesh butterfly valve, the outlet of the wire mesh filtering box is provided with a second wire mesh butterfly valve, the inlet of the activated carbon box is provided with a first activated carbon butterfly valve, the outlet of the activated carbon box is provided with a second activated carbon butterfly valve, one pressure interface of an activated carbon differential pressure transmitter is arranged between the first activated carbon butterfly valve and the inlet of the activated carbon box, the other pressure interface is arranged between the second activated carbon butterfly valve and the outlet of the activated carbon box, and an activated carbon outlet temperature transmitter is arranged between the second activated carbon butterfly valve and the outlet of the activated carbon box; the activated carbon box is provided with a fireproof spraying device inside, the fireproof spraying inlet of the activated carbon box is connected with a fireproof liquid supply port, and a pipeline between the fireproof liquid supply port and the activated carbon box is sequentially provided with a first filtering spraying ball valve, a filtering spraying pneumatic valve and a second filtering spraying ball valve along the liquid flow direction; the second activated carbon butterfly valve is connected with the inlet of the fan, the fan outlet is provided with a fan outlet butterfly valve, and the other end of the fan outlet butterfly valve is connected with the chimney; two ends of a first cross connection pipe are connected between the second wire mesh butterfly valve and the first activated carbon butterfly valve in the first filtering branch and the second filtering branch respectively, and two ends of a second cross connection pipe are connected between the second activated carbon butterfly valve and the fan in the first filtering branch and the second filtering branch respectively.

[0005] Preferably, the tank flue gas inlet is connected to one end of the third pneumatic valve, the other end of the third pneumatic valve is connected to one end of the 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 respectively, an inlet pressure transmitter and a combustible gas detector are arranged 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 alkali washing unit inlet, an alkali washing inlet temperature transmitter is arranged on the pipeline between the first pneumatic valve and the alkali washing unit inlet, the other end of the second pneumatic valve is connected to one end of the oil gas recovery cut-off valve, a first vent valve is connected to the pipeline between the second pneumatic valve and the oil gas recovery cut-off valve, and the other end of the oil gas recovery cut-off valve is connected to the oil gas recovery system.

[0006] Preferably, the coking unit inlet is connected to the electric coking inlet, and a coking electric fireproof valve and a coking unit inlet temperature transmitter are arranged on the pipeline between the coking unit inlet and the electric coking inlet in sequence, a coking pressure transmitter, a coking temperature transmitter and an insulation tank temperature transmitter are arranged on the upper part of the electric coking device, a coking fireproof spray inlet on the upper part of the electric coking device is connected to a fireproof liquid supply inlet through two parallel coking spray pipelines, a first coking spray ball valve is arranged on one branch of the coking spray pipeline, and a second coking spray ball valve, a coking spray pneumatic valve and a third coking spray ball valve are arranged on the other coking spray branch in sequence along the coking spray liquid conveying direction.

[0007] Preferably, one end of the circulation inlet valve is connected to the alkali liquid circulation port, the other end of the circulation inlet valve is connected to the alkali liquid circulation pump inlet, the alkali liquid circulation pump outlet 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 pipeline, an alkali liquid vent valve is connected to the pipeline between the alkali liquid circulation pump outlet 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, and the other end of the pressure gauge isolation valve is connected to the field pressure gauge.

[0008] Preferably, the front end of the water supplement inlet is connected to the water supply pipeline, the rear end of the water supplement inlet is connected to one end of the water supplement cut-off valve, the other end of the water supplement cut-off valve is connected to the alkali washing tower water inlet through two parallel water supplement pipelines, a first water supplement ball valve is arranged on one water supplement pipeline, and a second water supplement ball valve, a water supplement pneumatic valve and a third water supplement ball valve are arranged on the other water supplement pipeline in sequence, and a water supplement pressure gauge is arranged on the pipeline between the water supplement cut-off valve and the second water supplement ball valve.

[0009] Preferably, the alkali liquid inlet is connected to the inlet of the main alkali liquid supplement pump and the inlet of the standby alkali liquid supplement pump, one end of the alkali liquid supplement ball valve is connected to the outlet of the main alkali liquid supplement pump and the outlet of the standby alkali liquid supplement pump, and the other end of the alkali liquid supplement ball valve is connected to the alkali washing liquid pool, and a liquid level sensor and a pH sensor are arranged at the alkali washing liquid pool.

[0010] Preferably, the lower part of the electric focus catcher is provided with a waste oil outlet connected with a waste oil collecting tank, and a waste oil outlet valve is arranged on the pipeline between the waste oil outlet and the waste oil collecting tank, and a waste oil weight meter is arranged on the waste oil collecting tank.

[0011] Preferably, a waste gas flow meter is arranged on the pipeline between the rear end of the first filter branch, the rear end of the second filter branch and the chimney.

[0012] An asphalt fume treatment intelligent management and control method is applied to the asphalt fume treatment intelligent management and control device, in the alkali washing unit, if the pH value of the alkali washing liquid is low and the liquid level is in the normal range, the alkali liquid inlet is opened to supplement high-concentration alkali liquid, the pH value is increased to the appropriate range; if the alkali washing liquid level is low, the water inlet executes water supplementing, and the pH value of the alkali washing liquid is monitored, if the water supplementing causes the pH value to be low, the alkali liquid inlet is opened to supplement high-concentration alkali liquid, and the pH value is increased to the appropriate range; if the pH value of the alkali washing liquid is low and the liquid level is high, the pH value cannot be adjusted by supplementing alkali liquid, and the control unit prompts the staff to execute alkali liquid emptying; if the alkali washing liquid level reaches the minimum or maximum limit value, the alkali washing circular spraying is stopped, and the control unit issues an alarm.

[0013] Preferably, in the filtering unit, when filtering is executed, the first filter branch and the fan of the first filter branch are opened, the asphalt fume is driven by the fan to pass through the silk screen filter box and the activated carbon box in sequence, filtering is completed, and the asphalt fume is sent into the chimney or the exhaust pipe to meet the emission standard; the activated carbon outlet temperature transmitter monitors the gas temperature at the outlet of the activated carbon box in real time, when the temperature is abnormally high, a high fire risk alarm is issued, and the filtering spraying pneumatic valve is opened to spray and extinguish fire or reduce temperature; when single-device isolation maintenance is performed, the asphalt fume bypasses the isolated device through the first cross connection pipe or the second cross connection pipe, and the normal filtering of the filtering unit is not affected.

[0014] The asphalt fume treatment intelligent management and control device has the following beneficial effects: On the basis of the existing oil gas recovery equipment, the asphalt fume treatment management and control device is newly added, is connected with the inlet pipeline of the existing oil gas recovery equipment, and realizes separate setting of the environmental protection facilities: one set of oil gas recovery device and one set of asphalt fume treatment management and control device. When the asphalt fume treatment management and control device fails or is maintained, the oil gas recovery device can also be used temporarily to complete a small amount of asphalt fume treatment work.

[0015] The LEL online analysis system is additionally arranged on the flue gas inlet pipeline, and the safety of device operation is improved.

[0016] Part of the equipment in the filtering unit and the alkali washing unit adopts one main and one backup design, when the main equipment fails or is maintained, the backup equipment can be seamlessly connected and started, and the whole does not need to be stopped, and the reliability and treatment efficiency of the equipment are improved.

[0017] Each sensor, pneumatic valve is electrically connected or wireless communication with control unit, completes the monitoring management to device operation, through data acquisition, control and centralized monitoring, management mode, controls, records, displays and alarms etc. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the framework view of asphalt smoke treatment and control device of embodiment one of the application; Figure 2 It is the structure schematic view of gas inlet shunt unit of embodiment one of the application; Figure 3 It is the structure schematic view of alkali washing unit of embodiment one of the application; Figure 4 It is the structure schematic view of focus capturing unit of embodiment one of the application; Figure 5 It is the structure schematic view of filter unit of embodiment one of the application; Wherein, 101 is the storage tank smoke inlet, 102 is the loading smoke 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 alkali washing inlet temperature transmitter, 109 is the oil gas recovery cut-off valve, 110 is the first vent valve, 201 is the alkali washing tower gas inlet, 202 is the alkali washing tower gas outlet, 203 is the alkali washing differential pressure transmitter, 204 is the alkali washing liquid pool, 205 is the first alkali washing spray pipe, 206 is the second alkali washing spray pipe, 207 is the main alkali solution supplement pump, 208 is the standby alkali solution supplement pump, 209 is the alkali solution supplement ball valve, 210 is the water supplement cut-off valve, 211 is the first water supplement ball valve, 212 is the second water supplement ball valve, 213 is the third water supplement ball valve, 214 is the water supplement pneumatic valve, 215 is the water supplement pressure gauge, 216 is the alkali washing tower water inlet, 217 is the alkali solution circulation port, 218 is the circulation inlet valve, 219 is the alkali solution circulating pump, 220 is the alkali solution vent valve, 221 is the liquid pump outlet check valve, 222 is the circulation outlet valve, 223 is the pressure gauge isolation valve, 224 is the density sensor, 225 is the first alkali washing spray valve, 226 is the second alkali washing spray valve, 227 is the liquid level sensor, 228 is the pH value sensor, 229 is the field pressure gauge, 230 is the liquid pump outlet pneumatic valve; 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. 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

[0019] Unless otherwise stated, the term "connection" as used hereafter refers to "connection via a pipe". Example 1

[0020] like Figure 1 As shown, an intelligent control device for treating asphalt fumes includes: an air intake diversion unit, an alkaline washing unit, a coke trapping unit, a filtration unit, and a control unit.

[0021] The control unit can specifically be a combination of existing products such as industrial control computers and PLCs.

[0022] 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.

[0023] 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.

[0024] like Figure 3 As shown, the alkaline washing unit includes an alkaline washing tower. The alkaline washing tower inlet 201, located on the lower side wall of the tower, is connected to the inlet of the alkaline washing unit, allowing asphalt fumes to enter the tower. The top of the tower is the alkaline washing tower outlet 202, from which the asphalt fumes exit the tower after alkaline washing. The alkaline washing tower 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 alkaline washing tower inlet 201, and the other pressure port is connected after the alkaline washing tower outlet 202.

[0025] 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.

[0026] 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 liquid tank 204.

[0027] 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.

[0028] 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.

[0029] The first circulation branch front end is a circulation inlet valve 218, one end of the circulation inlet valve 218 is connected with the lye circulation port 217, and the other end of the circulation inlet valve 218 is connected with the inlet of the lye circulation pump 219. The outlet of the lye circulation pump 219 is connected with the front end of the liquid pump outlet check valve 221, the rear end of the liquid pump outlet check valve 221 is connected with one end of the circulation outlet valve 222, and the other end of the circulation outlet valve 222 is connected with one end of the first caustic washing spray valve 225 and one end of the second caustic washing spray valve 226 respectively. The other end of the first caustic washing spray valve 225 is connected with the first caustic washing spray pipe 205, and the other end of the second caustic washing spray valve 226 is connected with the second caustic washing spray pipe 206. The pipeline between the outlet of the lye circulation pump 219 and the liquid pump outlet check valve 221 is connected with the lye vent valve 220. The pipeline between the liquid pump outlet check valve 221 and the circulation outlet valve 222 is connected with one end of the pressure gauge isolation valve 223, and the other end of the pressure gauge isolation valve 223 is connected with the field pressure gauge 229.

[0030] The difference between the second circulation branch and the first circulation branch is that the liquid pump outlet check valve 221 is replaced by the liquid pump outlet pneumatic valve 230 in the second circulation branch, and other components and connection relationships are completely the same as those in the first circulation branch. This design is considered that if both circulation branches adopt check valves (fluid can only pass through the check valve in one direction), and the lye vent valve 220 is arranged before the check valve, the caustic washing liquid in the pipe section after the check valve cannot be effectively emptied. Therefore, the check valve 221 in the second circulation branch is replaced by the liquid pump outlet pneumatic valve 230 in the present application, and the pneumatic valve allows liquid backflow. When it is necessary to vent the caustic washing liquid, the liquid pump outlet pneumatic valve 230 of the second circulation branch is opened, and the complete emptying of the caustic washing liquid can be realized.

[0031] The lye pool 204 in the caustic washing tower is provided with a liquid level sensor 227 and a pH sensor 228, which are used for monitoring the liquid level height and the pH value of the caustic washing liquid respectively.

[0032] As shown in Figure 4 The tar capturing unit includes an electric tar catcher, which is a kind of tar gas initial cooling equipment for separating tar droplets and coke oven gas by using the action of high-voltage direct current electric field, and belongs to the prior art. The tar capturing elements, fireproof spray equipment and the like in the electric tar catcher can be known from public data, and will not be described here.

[0033] The tar capturing unit inlet is connected with the electric tar catcher gas inlet 303, and a tar capturing electric fire valve 301 and a tar capturing unit inlet temperature transmitter 302 are sequentially arranged on the pipeline between the tar capturing unit inlet and the electric tar catcher gas inlet 303.

[0034] The asphalt flue gas enters the electric tar catcher through the electric tar catcher gas inlet 303, is subjected to electric tar capturing, is discharged from the electric tar catcher gas outlet 304, and is sent to the filter unit inlet.

[0035] The lower part of the electric coking trap is provided with a waste oil outlet 305, which is connected with a waste oil collecting tank 307, and a waste oil outlet valve 306 is arranged on the pipeline between the waste oil outlet 305 and the waste oil collecting tank 307, and a waste oil weight meter 308 is arranged on the waste oil collecting tank 307.

[0036] The upper part of the electric coking trap is provided with a coking pressure transmitter 314 and a coking temperature transmitter 315 for monitoring the pressure and temperature inside the electric coking trap respectively, and is provided with an insulation tank temperature transmitter 316 for monitoring the temperature of the insulation tank of the electric coking trap.

[0037] The coking fireproof spray inlet 313 of the upper part of the electric coking trap is connected with the fireproof liquid supply inlet through two parallel coking spray pipelines, one branch of the coking spray pipeline is provided with a first coking spray ball valve 309, and the other branch is provided with a second coking spray ball valve 310, a coking spray pneumatic valve 312 and a third coking spray ball valve 311 in sequence along the coking spray liquid conveying direction.

[0038] As shown in Figure 5 The filtering unit includes a filtering electric fireproof valve 401 connected behind the filtering unit inlet, the other end of the filtering electric fireproof valve 401 is connected with a first filtering branch and a second filtering branch in parallel with each other, and the rear ends of the first filtering branch and the second filtering branch are connected with a chimney. A waste gas flow meter 408 is arranged on the pipeline between the rear ends of the first filtering branch and the second filtering branch and the chimney.

[0039] The first filtering branch is provided with a wire mesh filtering tank 402, an activated carbon tank 403, a fan 404 and a fan outlet butterfly valve 405 in sequence along the gas flow direction.

[0040] The wire mesh filtering tank 402 is provided with a first wire mesh butterfly valve 402a at the inlet and a second wire mesh butterfly valve 402b at the outlet. The wire mesh filtering tank 402 is an existing device, which can intercept and capture residual asphalt smoke tar in waste gas. During maintenance, the first wire mesh butterfly valve 402a and the second wire mesh butterfly valve 402b before and after the wire mesh filtering tank 402 are closed, so that the wire mesh filtering tank 402 can be isolated.

[0041] The activated carbon tank 403 is provided with a first activated carbon butterfly valve 403a at the inlet and a second activated carbon butterfly valve 403b at the outlet. One pressure interface of an activated carbon differential pressure transmitter 406 is arranged between the first activated carbon butterfly valve 403a and the inlet of the activated carbon tank 403, and the other pressure interface is arranged between the second activated carbon butterfly valve 403b and the outlet of the activated carbon tank 403. An activated carbon outlet temperature transmitter 407 is arranged between the second activated carbon butterfly valve 403b and the outlet of the activated carbon tank 403.

[0042] The activated carbon tank 403 is a prior art device, which is internally provided with honeycomb activated carbon to adsorb VOCs in the exhaust gas through the high microporous structure of the activated carbon. The activated carbon differential pressure transmitter 406 monitors the pressure difference before and after the activated carbon tank 403. If the pressure difference is abnormal during filtration, it usually means that the adsorption capacity of the activated carbon has decreased after long-term use, and the control unit will remind the staff to maintain the device. During maintenance, the first activated carbon butterfly valve 403a and the second activated carbon butterfly valve 403b before and after the activated carbon tank 403 are closed, so that the wire mesh filter tank 402 can be isolated.

[0043] The activated carbon tank 403 is also equipped with a fireproof spray device inside. The fireproof spray inlet of the activated carbon tank 403 is connected with a fireproof liquid supply port. A first filter spray ball valve 411, a filter spray pneumatic valve 413 and a second filter spray ball valve 412 are sequentially arranged on the pipeline between the fireproof liquid supply port and the activated carbon tank 403 along the liquid flow direction.

[0044] The second activated carbon butterfly valve 403b is connected with the inlet of the fan 404. The fan outlet butterfly valve 405 is arranged at the outlet of the fan 404. The other end of the fan outlet butterfly valve 405 is connected with a chimney. The fan 404 provides driving force for the gas flow of the filtration unit through negative pressure suction. During maintenance of the fan 404, the second activated carbon butterfly valve 403b and the fan outlet butterfly valve 405 are closed to isolate the fan 404.

[0045] The second filter branch and the first filter branch have the same equipment and connection relationship.

[0046] The first cross connection pipe 409 is 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, respectively. The second cross connection pipe 410 is connected between the second activated carbon butterfly valve 403b and the fan 404 in the first filter branch and the second filter branch, respectively. Embodiment two

[0047] An intelligent management and control method of asphalt fume treatment is applied to the intelligent management and control device of asphalt fume treatment in embodiment one, which comprises the following steps: In the gas inlet shunt unit, the combustible gas detector 107 is electrically connected or wirelessly communicates (the dashed line represents wireless communication) with the first pneumatic valve 103 and the second pneumatic valve 104 to control the opening and closing of the first pneumatic valve 103 and the second pneumatic valve 104.

[0048] The caustic washing differential pressure transmitter 203 is used to monitor whether asphalt fume is being introduced into the caustic washing unit. If so, the caustic washing cycle spray is started The inlet pressure transmitter 106 is used to monitor the pipeline gas pressure, and the control unit will adjust the fan operation according to the pipeline gas pressure. For example, the gas pressure threshold is set to -150 Pa, when the inlet pressure transmitter 106 detects that the pipeline pressure < -150 Pa, the fan 404 stops running, and when the pipeline pressure ≥ -150 Pa, the fan 404 resumes normal operation.

[0049] The combustible gas detector 107 selects the LEL (Lower Explosive Limit) online 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 fume does not reach the limit, the asphalt fume is sent to the caustic washing unit for subsequent treatment, otherwise the asphalt fume is sent to the original oil gas recovery system for treatment.

[0050] For example, the combustible gas concentration is set to 25%, when the combustible gas detector 107 detects that it exceeds the limit of 25%, the first pneumatic valve 103 is closed, the second pneumatic valve 104 is opened, and the oil gas recovery system is started; if the concentration of combustible gas in the asphalt fume is detected to be lower than 25%, the second pneumatic valve 104 is closed, the oil gas recovery system is closed, and the first pneumatic valve 103 is opened.

[0051] When the inlet gas shunt unit is maintained and repaired, the first vent valve 110 can be manually opened to exhaust a small amount of asphalt fume remaining in the pipeline.

[0052] In the caustic washing unit, the alkali inlet is used to provide high-concentration alkali, for example, the alkali inlet is connected to an alkali tank or an alkali conveying pipeline at the front end. When the pH value of the alkali is low, alkali replenishment is performed, that is, one of the alkali replenishment ball valve 209 and the main alkali replenishment pump 207 and the standby alkali replenishment pump 208 is opened, that is, high-concentration alkali can be supplemented to the caustic washing tank 204 to increase the pH value of the alkali. The main alkali replenishment pump 207 and the standby alkali replenishment pump 208 are arranged in a "one main and one standby" manner, and the main alkali replenishment pump 207 is used normally, and when the main alkali replenishment pump 207 fails or is maintained, the standby alkali replenishment pump 208 is enabled.

[0053] When the water replenishment pressure gauge 215 detects abnormal pressure, manually close the water replenishment cut-off valve 210 to isolate the water replenishment inlet.

[0054] The alkali washing water replenishment is usually automatically controlled, the first water replenishment ball valve 211 is always closed, the second water replenishment ball valve 212 and the third water replenishment ball valve 213 are always opened, and the opening and closing of the water replenishment pneumatic valve 214 is controlled by the control unit to realize water replenishment. In special cases, for example, when the water replenishment pneumatic valve 214 needs to be overhauled, manual alkali washing water replenishment can be switched to, the second water replenishment ball valve 212 and the third water replenishment ball valve 213 are closed, so that the water replenishment pneumatic valve 214 is isolated, and the first water replenishment ball valve 211 is manually opened to replenish water, so that the normal water replenishment is not affected when the water replenishment pneumatic valve 214 is maintained and overhauled.

[0055] When the alkali washing cycle spraying is performed, the first cycle branch is mainly used, the cycle inlet valve 218, the alkali solution circulation pump 219, the liquid pump outlet check valve 221 and the cycle outlet valve 222 are opened, the alkali solution circulation pump 219 can pump the alkali washing solution upward to the first alkali washing spraying pipe 205 and the second alkali washing spraying pipe 206 to complete the alkali washing spraying, and the check valve 221 can effectively prevent the backflow of the alkali washing solution. When the first cycle branch is overhauled, the second cycle branch can be temporarily used to complete the alkali washing spraying. When a large amount of spraying is required, the first cycle branch and the second cycle branch can also be opened and used at the same time.

[0056] The method for monitoring the liquid level height and the pH value of the alkali washing solution is as follows: If the pH value of the alkali washing solution is low and the liquid level is in the normal range, the alkali solution replenishment is started to increase the pH value to the appropriate range. If the liquid level of the alkali washing solution is low, the alkali washing water replenishment is performed, and the pH value of the alkali washing solution is monitored, if the water replenishment causes the pH value to be low, the alkali solution replenishment is started at the same time, and the pH value is increased to the appropriate range. If the pH value of the alkali washing solution is low and the liquid level is high, the pH value cannot be adjusted by replenishing the alkali solution, and the control unit prompts the staff to perform the alkali solution emptying. If the alkali washing liquid level reaches the minimum or maximum limit value, the alkali washing cycle spraying is stopped, and the control unit issues an alarm.

[0057] The field pressure gauge 229 is used to detect the hydraulic pressure of the first cycle branch in real time; when the field pressure gauge 229 needs to be maintained and overhauled, the pressure gauge isolation valve 223 is closed, and the maintenance and overhaul of the field pressure gauge 229 do not affect other equipment.

[0058] The alkali washing solution used for long-term circulation needs to be emptied and updated regularly, when the alkali washing solution needs to be emptied, the alkali solution emptying valve 220 and the alkali solution circulation pump 219 are opened, and the alkali washing solution in the alkali washing solution tank 204 can be emptied.

[0059] In the coke capturing unit, when the internal temperature, pressure or insulation box temperature of the electric coke catcher is higher than the set threshold value, it is determined that the fire risk is high, at this time, the fire extinguishing spraying equipment in the electric coke catcher is started to extinguish the fire; at the same time, the coke capturing electric fire valve 301 and the filtering electric fire valve 401 are closed to prevent the fire from spreading along the pipeline to other units.

[0060] When the gas temperature at the entrance of the coking unit is detected by the temperature transmitter 302, the coking electric fireproof valve 301 is activated and quickly cuts off the asphalt fume to avoid fire.

[0061] The waste tar captured by the electric coking collector accumulates at the bottom of the electric coking collector and flows out from the waste oil outlet 305 to the waste oil collection tank 307 for collection. The waste oil weight meter 308 detects the weight of the currently collected waste tar, and when the weight of the waste tar reaches a set threshold, a signal is sent to the control unit to remind the staff to clean or replace the waste oil collection tank 307. At this time, the staff closes the waste oil outlet valve 306 to perform cleaning or replacement, and then opens the waste oil outlet valve 306 after completion.

[0062] The fireproof liquid supply port can be connected to water and nitrogen according to the "International Standard for Automatic Sprinkler System NFPA13". Nitrogen is used as a driving medium to push water out of the nozzle of the sprinkler device to form a water mist to suppress fire or rapidly cool down.

[0063] In the filtering unit, when filtering is performed, the first filtering branch and the fan 404 of the first filtering branch are opened, and the asphalt fume is driven by the fan 404 to pass through the wire mesh filter tank 402 and the activated carbon tank 403 in turn, and then is filtered and sent into the chimney or exhaust pipe for standard emission.

[0064] Since the activated carbon tank 403 can absorb more combustible materials, it is more prone to spontaneous combustion. The activated carbon outlet temperature transmitter 407 monitors the gas temperature at the outlet of the activated carbon tank 403 in real time, and when the temperature is abnormally high, a high fire risk alarm is issued and the filtering spray pneumatic valve 413 is opened to spray and extinguish the fire or cool down.

[0065] When a single device is isolated for maintenance, since two symmetrical filtering branches are provided, the asphalt fume can bypass the isolated device through the first jumper pipe 409 or the second jumper pipe 410, and when any single device is isolated for maintenance, the normal filtering of the filtering unit will not be affected.

[0066] In the embodiments of the present application, the technical features not described in detail are prior art or conventional technical means, which will not be described here.

[0067] Finally, it should be noted that the above embodiments are only specific implementations of the present application, which are used to illustrate the technical solutions of the present application, but not to limit them. The protection scope of the present application is not limited to this. Those skilled in the art should understand that any person skilled in the art can modify or easily think of changes to the technical solutions described in the above embodiments within the technical scope disclosed by the present application, or make equivalent replacement to some technical features; and these modifications, changes or replacements do not change the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should be covered within the protection scope of the present application.

Claims

1. An intelligent control device for treating asphalt fume, comprising a control unit, characterized in that, The control unit is electrically connected to an air intake diversion unit, an alkaline washing unit, a coke catching unit, and a filtration unit arranged in sequence. The air intake diversion unit includes a storage tank flue gas inlet and a loading flue gas inlet. The coke catching unit includes an electric coke catching device. The alkaline washing unit includes an alkaline washing tower. The bottom of the alkaline washing tower is an alkaline washing liquid pool, and the upper part of the alkaline washing tower is an alkaline washing spray pipe. The lower side wall of the alkaline washing tower has an air inlet and a water inlet from top to bottom. The air inlet of the alkaline washing tower 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 is an alkaline washing tower outlet connected to the inlet of the coke catching unit. An alkaline washing differential pressure transmitter... One pressure port is connected before the air inlet of the alkaline washing tower, and another pressure port of the alkaline washing differential pressure transmitter is connected after the air outlet of the alkaline washing tower. The bottom opening of the alkaline washing tower is connected to the alkaline solution inlet. An alkaline solution circulation port is provided on the lower part of the side wall of the alkaline washing solution tank. The alkaline solution circulation port is connected to the alkaline washing spray pipe through a first circulation branch and a second circulation branch connected in parallel. The filtration unit includes a filter electric fire damper connected after the inlet of the filtration unit. The other end of the filter electric fire damper is connected to a first filter branch and a second filter branch connected in parallel. The rear ends of the first filter branch and the rear ends of the second filter branch are connected to the chimney. The first filter branch is along the gas flow direction. The system is sequentially equipped with 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. Similarly, 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. 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 located between the second activated carbon butterfly valve and the activated carbon box outlet. The activated carbon box is equipped with a fire-retardant sprinkler system. The fire-resistant spray inlet of the activated carbon box is connected to the fire-resistant liquid supply port. Along the liquid flow direction, the pipeline between the fire-resistant liquid 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. The second activated carbon butterfly valve is connected to the inlet of the fan, and the fan outlet is equipped with a fan outlet butterfly valve. 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.

2. The intelligent control device for asphalt fume treatment according to claim 1, characterized in that, The storage tank flue gas inlet is connected to one end of the third pneumatic valve, and the other end of the third pneumatic valve is connected to one end of the 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 the 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 intelligent control device for asphalt fume treatment according to claim 1, characterized in that, The coke-catching unit inlet is connected to the electric coke-catching air inlet, and the pipeline between the coke-catching unit inlet and the electric coke-catching air inlet is sequentially equipped with a coke-catching electric fire-prevention valve and a coke-catching unit inlet temperature transmitter. The upper part of the electric coke catching unit is equipped with a coke-catching pressure transmitter, a coke-catching temperature transmitter, and an insulation box temperature transmitter. The coke-catching fire-prevention spray inlet at the upper part of the electric coke catching unit is connected to the fire-prevention liquid supply port through two parallel coke-catching spray pipelines. One branch coke-catching spray is equipped with a first coke-catching spray ball valve, and the other coke-catching spray branch is sequentially equipped with a second coke-catching spray ball valve, a coke-catching spray pneumatic valve, and a third coke-catching spray ball valve along the coke-catching spray liquid delivery direction.

4. The intelligent control device for asphalt fume treatment 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.

5. The intelligent control device for asphalt fume treatment according to claim 4, 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.

6. The intelligent control device for asphalt fume treatment according to claim 5, 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 liquid tank. A liquid level sensor and a pH sensor are installed in the alkali washing liquid tank.

7. The intelligent control device for asphalt fume treatment 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.

8. The intelligent control device for asphalt fume treatment according to claim 1, 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.

9. A method for intelligent control of asphalt fume treatment, characterized in that, In the intelligent control device for asphalt fume treatment described in claim 1, in the alkaline washing unit, if the pH value of the alkaline washing solution is low but the liquid level is within the normal range, the alkaline inlet is opened to replenish high-concentration alkaline solution and raise the pH value to a suitable range; if the alkaline washing solution level is low, the water inlet is used to replenish water while monitoring the pH value of the alkaline washing solution. If water replenishment causes the pH value to be low, the alkaline inlet is opened again to replenish high-concentration alkaline solution and raise the pH value to a suitable range; if the pH value of the alkaline washing solution is low and the liquid level is high, and the pH value cannot be adjusted by replenishing alkaline solution, the control unit prompts the staff to drain the alkaline solution; if the alkaline washing solution level reaches the minimum or maximum limit, the alkaline washing circulation spray stops, and the control unit issues an alarm.

10. The intelligent control method for asphalt fume treatment according to claim 9, characterized in that, In the filtration unit, when filtration is performed, the first filtration branch and the fan of the first filtration branch are turned on. The asphalt fumes are driven by the fan to pass through the wire mesh filter box and the activated carbon box in sequence, and the filtration is completed and sent into the chimney or exhaust stack to meet the emission standards. The activated carbon outlet temperature transmitter monitors the gas temperature at the outlet of the activated carbon box in real time. When the temperature is abnormally high, it issues a high fire risk alarm and opens the filter spray pneumatic valve for spraying fire extinguishing or cooling. When performing isolation maintenance on a single piece of equipment, the asphalt fumes bypass the isolated equipment through the first or second cross-connection, without affecting the normal filtration of the filter unit.

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