Tail gas treatment device for top loading of combustible liquid

Abstract

The utility model relates to the technical field of combustible liquid transportation in the coking industry, in particular to a tail gas treatment device for top loading of combustible liquid, which is characterized in that a first exhaust pipeline is provided with a branch tee joint to be connected with a second exhaust pipeline, and the second exhaust pipeline is connected with a chimney sequentially through a filter; a fifth electromagnetic valve is arranged on the first exhaust pipeline, and a fourth electromagnetic valve is arranged on the second exhaust pipeline; an outlet pipeline of the charging pump is connected with the material storage tank through a circulating pipeline; a first electromagnetic valve is arranged on the circulating pipeline; a second electromagnetic valve is arranged between the first tee joint and the second tee joint; a third electromagnetic valve is arranged behind the self-operated regulating valve on the nitrogen pipe; the first electromagnetic valve, the second electromagnetic valve and the fifth electromagnetic valve are in interlocking control with a liquid level monitoring alarm in the tank car; and the third electromagnetic valve and the fourth electromagnetic valve are in interlocking control with an oxygen monitoring alarm on the exhaust pipeline II. The device has the advantages that nitrogen is replaced and discharged into the atmosphere before being loaded, and after the oxygen content reaches the standard, the nitrogen is connected back to a diffused gas main pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of flammable liquid transportation in the coking industry, in particular to an exhaust gas treatment device for top loading of flammable liquid. Background Art

[0002] The coking products obtained by the coking industry, such as light oil, phenol oil, naphthalene oil, washing oil, anthracene oil, anthracene oil, asphalt and other liquid products, are all flammable liquids and are basically transported by tank trucks. There are currently two methods for treating exhaust gas from the coking industry. One is the method of introducing a negative pressure gas system as recommended by the "Environmental Protection Design Code for Iron and Steel Industry" (GB50406-2017). This method uses the front suction of the blower of the gas purification device to recover the exhaust gas into the negative pressure gas pipeline, which basically eliminates the unorganized emission of the exhaust gas. The gas purification system can also recover benzene, ammonia and various fraction gases in the exhaust gas, turning the exhaust gas into treasure and improving the on-site environment. However, the amount of exhaust gas recovered by this method is too large, and the main component is nitrogen, which affects the calorific value of the gas. Few processes use this method; the other is the absorption method plus incineration method, that is, after the exhaust gas is washed with washing oil, the exhausted exhaust gas is sent to the incinerator through the exhaust draft fan, and the remaining harmful substances are completely removed by combustion, which completely solves the environmental protection problem of the exhaust gas. This method is widely used.

[0003] The tail gas from coking is divided into four categories. The first category is the exhaust gas from storage tanks, including the exhaust gas from Class C products, such as raw material tar tanks, phenol oil tanks, oil wash tanks, anthracene oil tanks, asphalt tanks, etc.; the exhaust gas from Class B products, such as industrial naphthalene tanks, high-temperature modified asphalt tanks, kerosene tanks, etc.; the exhaust gas from Class A products, such as light oil tanks, etc., are nitrogen-sealed exhaust gases, do not contain air, and can be sent to the incinerator for incineration treatment; the second category is non-condensable combustible gas, such as the exhaust gas after cooling the modified asphalt reactor, the main component of which is methane. After on-site testing, the calorific value is higher than that of coal gas, and can be used as fuel gas; the third category is the exhaust gas from tank truck unloading, which is nitrogen-sealed when unloading and does not contain air, and can be incorporated into the exhaust gas from the storage tank for incineration treatment; the fourth category is the exhaust gas from tank truck loading. The exhaust gas contains air during the loading process. If it is directly incinerated, there may be a risk of explosion. The current design is to incorporate it into the exhaust gas from the storage tank and send it to the incinerator.

[0004] The amount of tanker loading exhaust gas is smaller than that of the storage tank exhaust gas, which reduces the risk of explosion. It can be sent to the incinerator for incineration, but the explosion risk factor is not completely removed. It is necessary to monitor the oxygen content of the incineration exhaust gas in real time. When the oxygen content exceeds 2%, it must be discharged into the atmosphere to avoid the occurrence of explosion risk, which will inevitably cause certain harm to the environment. Therefore, tanker loading exhaust gas is still a dangerous factor in exhaust gas incineration treatment and needs to be solved urgently. Utility Model Content

[0005] The utility model aims to provide an exhaust gas treatment device for top loading of flammable liquids, which overcomes the shortcomings of the prior art. Before the tank truck is loaded, the internal space of the tank truck is replaced with nitrogen, and the exhaust process is monitored throughout by an oxygen analyzer. After the oxygen analyzer analyzes that the exhaust gas meets the standard, the exhaust gas is discharged back to the storage tank exhaust gas main pipe, and the tank truck is started to be loaded. The exhaust gas discharged during the loading process is merged into the storage tank exhaust gas main pipe. The exhaust gas does not contain air, and the loading process is fully automated.

[0006] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0007] An exhaust gas treatment device for top loading of flammable liquids comprises a material storage tank, a loading pump, a loading pipe and an exhaust pipeline 1, wherein the material storage tank is connected to the loading pipe under the unloading arm of a tank truck via a pipeline, a loading pump is arranged on the pipeline, a tank truck sealing cover matches the loading port on the top of the automobile tank truck, and an exhaust hose is arranged on the tank truck sealing cover and connected to the exhaust pipeline 1; it is characterized in that the exhaust pipeline 1 is provided with a branch tee connected to the exhaust pipeline 2, and the exhaust pipeline 2 is connected in sequence via a ceramic filter, an activated carbon filter and a chimney; the exhaust pipeline 1 is provided with a fifth solenoid valve, and the exhaust pipeline 2 is provided with a fourth solenoid valve; A first tee is provided on the outlet pipeline of the charging pump, the first tee is connected to the material storage tank through a circulation pipeline, and a first solenoid valve is provided on the circulation pipeline; a second tee is provided between the first tee and the tank truck unloading arm, and a second solenoid valve is provided between the first tee and the second tee; the second tee is connected to a nitrogen pipe, a self-operated regulating valve is provided on the nitrogen pipe, and a third solenoid valve is provided after the self-operated regulating valve; the first solenoid valve, the second solenoid valve and the fifth solenoid valve are interlocked with the liquid level monitoring alarm in the tank truck; the third solenoid valve and the fourth solenoid valve are interlocked with the oxygen monitoring alarm on the exhaust pipeline 2.

[0008] The ceramic filter is connected with a steam pipe.

[0009] The material storage tanks are multiple and arranged in parallel, and the tops of the material storage tanks are connected to the exhaust gas main pipe.

[0010] The lower end of the charging pipe is below the upper limit set for the tank truck.

[0011] A flow recording and accumulating instrument is provided on the feeding side of the second solenoid valve.

[0012] The liquid level monitoring alarm is equipped with any one of a float type liquid level sensor, a float ball type liquid level sensor or a static pressure type liquid level sensor.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1) Before loading the tank truck, complete the nitrogen replacement first, replace all the air in the tank truck with nitrogen, and the replaced oxygen-containing air is filtered through a ceramic filter and activated carbon, and discharged into the atmosphere to avoid impurities polluting the environment. After the oxygen content analyzer analyzes and meets the standards, the vented gas discharge pipe is connected back to the storage tank vented gas main pipe.

[0015] 2) After the tank truck has replaced the nitrogen, it starts loading. Since the exhaust gas does not contain oxygen, it can be safely merged into the storage tank exhaust to complete the incineration treatment. The entire loading process can be fully automated, and the labor intensity is significantly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the process flow of an embodiment of the utility model.

[0017] In the figure: 1- material storage tank, 2- charging pump, 3- automobile tank truck, 4- tank truck unloading arm, 5- tank truck sealing cover, 6- ceramic filter, 7- activated carbon filter, 8- chimney, 9- self-operated regulating valve, 10- first solenoid valve, 11- second solenoid valve, 12- third solenoid valve, 13- fourth solenoid valve, 14- fifth solenoid valve, 15- charging pipe, 16- exhaust pipeline 1, 17- exhaust hose, 18- exhaust pipeline 2, 19- branch three-way, 20- first three-way, 21- second three-way, 22- nitrogen pipe, 23- circulation pipeline, O 2 AS-oxygen monitoring alarm, LSA-liquid level monitoring alarm, H-liquid level high limit. DETAILED DESCRIPTION

[0018] The technical solution of the present utility model will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the specific embodiments required to be used in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some implementation methods of the utility model. For ordinary technicians in this field, other specific embodiments can be obtained based on these specific embodiments without paying creative work.

[0020] The components of the embodiments of the present invention generally described and shown in the specific embodiments herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the utility model claimed, but only represents the selected embodiments of the utility model.

[0021] See Figure 1, is a schematic diagram of the structure of an embodiment of an exhaust gas treatment device for top loading of flammable liquids of the utility model, comprising a material storage tank 1, a charging pump 2, a charging pipe 15 and an exhaust pipeline 16, wherein the material storage tank 1 is connected to the charging pipe 15 under the tank truck unloading arm 4 through a pipeline, and a charging pump 2 is arranged on the pipeline, a tank truck sealing cover 5 matches the charging port on the top of the automobile tank truck 3, and an exhaust hose 17 is arranged on the tank truck sealing cover 5 and is connected to the exhaust pipeline 1 16; the exhaust pipeline 1 16 is provided with a branch tee 19 connected to the exhaust pipeline 2 18, and the exhaust pipeline 2 18 is connected to the ceramic filter 6, the activated carbon filter 7 and the chimney 8 in sequence; the exhaust pipeline 1 16 is provided with a fifth solenoid valve 14, and the exhaust pipeline 2 18 is provided with a fourth solenoid valve 13 ; A first tee 20 is provided on the outlet pipeline of the charging pump 2, and the first tee 20 is connected to the material storage tank 1 through a circulation pipeline 23, and a first solenoid valve 10 is provided on the circulation pipeline 23; a second tee 21 is provided between the first tee 20 and the tank truck unloading arm 4, and a second solenoid valve 11 is provided between the first tee 20 and the second tee 21; the second tee 21 is connected to the nitrogen pipe 22, and a self-operated regulating valve 9 is provided on the nitrogen pipe 22, and a third solenoid valve 12 is provided after the valve of the self-operated regulating valve 9; the first solenoid valve 10, the second solenoid valve 11 and the fifth solenoid valve 14 are interlocked with the liquid level monitoring alarm LSA in the automobile tank truck 3; the third solenoid valve 12, the fourth solenoid valve 13 and the oxygen monitoring alarm O on the exhaust pipeline 2 18 2 AS interlocking control.

[0022] The ceramic filter 6 is connected to a steam pipe for regeneration of the filter backflush core. Two material storage tanks 1 are arranged in parallel, and the top of the material storage tank 1 is connected to the exhaust gas main pipe. The lower end of the loading pipe 15 is below the upper limit H set for the tank car 3. The feed side of the second solenoid valve 11 is provided with a flow recording and accumulating instrument FRQ for loading and metering. The liquid level monitoring alarm LSA is equipped with any one of a buoy type liquid level sensor, a float type liquid level sensor or a static pressure type liquid level sensor.

[0023] The utility model discloses a method for treating exhaust gas of top loading of flammable liquids. Before loading the tank truck, the internal space of the tank truck is replaced with nitrogen. When the oxygen content in the exhaust gas reaches the standard, the loading is carried out. During the loading process, the exhaust gas is directly connected to the main exhaust gas pipe. The specific operation process is as follows:

[0024] 1) Loading preparation, all valves are in the closed state, the loading pump 2 is started, the first solenoid valve 10 is opened, and the loading pump 2 is in the circulation state;

[0025] 2) Nitrogen replacement, the tank truck unloading arm 4 inserts the loading pipe 15 from the loading port of the automobile tank truck 3, and locks the tank truck sealing cover 5; the third solenoid valve 12 and the fourth solenoid valve 13 are opened, the nitrogen pipe 22 is connected to the automobile tank truck 3 for nitrogen replacement, and the replaced air is discharged into the atmosphere through the ceramic filter 6, the activated carbon filter 7 and the chimney 8; the exhaust process is monitored by the oxygen monitoring alarm throughout the process, and after the oxygen monitoring value is lower than the set value and meets the standard, the third solenoid valve 12 and the fourth solenoid valve 13 are closed, and the nitrogen replacement is completed;

[0026] 3) Material loading, open the second solenoid valve 11 and the fifth solenoid valve 14, close the first solenoid valve 10, the material enters the automobile tank truck 3 through the second solenoid valve 11 and the tank truck unloading arm 4, and the loading exhaust gas is sent to the exhaust gas main pipe through the exhaust hose 17 and the exhaust pipeline 16; when the liquid level monitoring alarm detects that the automobile tank truck 3 is full, close the second solenoid valve 11 and the fifth solenoid valve 14, open the first solenoid valve 10, and the charging pump 2 resumes the circulation state, and the loading is completed.

[0027] The above operation process is fully automated by the PLC control system. The pressure after the self-operated regulating valve 9 is 0.1-0.15MPa. The pressure in the nitrogen pipe 22 is 0.4-0.6MPa.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An exhaust gas treatment device for top loading of flammable liquids, comprising a material storage tank, a loading pump, a loading pipe and an exhaust pipeline, wherein the material storage tank is connected to the loading pipe under the unloading arm of the tank truck through a pipeline, a loading pump is provided on the pipeline, a tank truck sealing cover matches the loading port on the top of the tank truck, and an exhaust hose is provided on the tank truck sealing cover and connected to the exhaust pipeline; characterized in that: The exhaust pipeline one is provided with a branch tee connected to the exhaust pipeline two, and the exhaust pipeline two is connected in sequence through a ceramic filter, an activated carbon filter and a chimney; the exhaust pipeline one is provided with a fifth solenoid valve, and the exhaust pipeline two is provided with a fourth solenoid valve; the outlet pipeline of the charging pump is provided with a first tee, and the first tee is connected to the material storage tank through a circulation pipeline, and the circulation pipeline is provided with a first solenoid valve; a second tee is provided between the first tee and the tank truck unloading arm, and a second solenoid valve is provided between the first tee and the second tee; the second tee is connected to the nitrogen pipe, and a self-operated regulating valve is provided on the nitrogen pipe, and a third solenoid valve is provided after the self-operated regulating valve; the first solenoid valve, the second solenoid valve and the fifth solenoid valve are interlocked with the liquid level monitoring alarm in the automobile tank truck; the third solenoid valve and the fourth solenoid valve are interlocked with the oxygen monitoring alarm on the exhaust pipeline two.

2. The exhaust gas treatment device for top loading of flammable liquids according to claim 1, characterized in that: The ceramic filter is connected with a steam pipe.

3. The exhaust gas treatment device for top loading of flammable liquids according to claim 1, characterized in that: The material storage tanks are multiple and arranged in parallel, and the tops of the material storage tanks are connected to the exhaust gas main pipe.

4. The exhaust gas treatment device for top loading of flammable liquids according to claim 1, characterized in that: The lower end of the charging pipe is below the upper limit set for the tank truck.

5. The exhaust gas treatment device for top loading of flammable liquids according to claim 1, characterized in that: A flow recording and accumulating instrument is provided on the feeding side of the second solenoid valve.

6. The exhaust gas treatment device for top loading of flammable liquids according to claim 1, characterized in that: The liquid level monitoring alarm is equipped with any one of a float type liquid level sensor, a float ball type liquid level sensor or a static pressure type liquid level sensor.

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