A self-heating maintenance type catalytic purification equipment for VOCs pollutants of a port terminal

Abstract

The application discloses a self-heat maintaining type catalytic purification device for VOCs pollutants in a port, which comprises an air inlet pipe, an air outlet pipe, a purification cylinder, a catalytic pipe and an air inlet partition plate. The catalytic pipe is located on the axis of the purification cylinder and divides the purification cylinder into a central axis space and an outer ring space. The central axis space and the outer ring space are communicated at the first end of the purification cylinder. The catalytic pipe is internally provided with a whole porous catalyst. The air inlet pipe is communicated with the outer ring space at the second end of the purification cylinder, and the air outlet pipe is communicated with the central axis space at the second end of the purification cylinder. The air inlet partition plate is arranged between the purification cylinder and the catalytic pipe. The self-heat maintenance of catalytic oxidation reaction can be realized. After the device is started, continuous electric heating or external energy supply is not needed for heating and maintaining the high temperature of the device, energy waste is reduced, and the safety hidden danger caused by high-temperature operation is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of VOCs pollutant purification, and relates to a self-heat maintaining type catalytic purification equipment for VOCs pollutants of a port terminal. BACKGROUND

[0002] In the process of oil and gas storage and handling, in order to maintain the pressure balance in the storage tank and oil tank, gas exchange with the outside world is needed in port terminals, fuel and hazardous chemical storage tank areas, gas stations and other places. A large amount of high-concentration oil gas will be discharged. A large amount of volatile organic compounds (VOCs), especially hydrocarbons, not only cause resource waste, but also cause serious air pollution and safety hazards. If these volatile organic compounds accumulate in a relatively closed space such as a cabin, reach the explosion limit, and the temperature is too high or sparks are generated, a fire, explosion or other safety accident may occur. In addition, most of the main components of oil gas are carcinogenic substances, and after being irradiated by ultraviolet light, oil gas will undergo a series of photochemical reactions with other harmful gases in the air to form more toxic pollutants. Polluted air and water can harm human health through breathing, skin contact, drinking water, etc.

[0003] In China, the oil and gas recovery and treatment equipment and facilities of crude oil terminals are mainly based on activated carbon adsorption method. However, the adsorption method requires a large amount of adsorbent, and the adsorption efficiency will gradually decrease during use. The desorption or regeneration process of a large amount of saturated adsorbent will inevitably cause secondary air pollution. The construction and operation cost of deep cooling equipment is very high, and due to the long pipeline, the safety risk of the storage tank and the pipeline is large. The catalytic combustion equipment can directly oxidize low-concentration volatile organic components into non-toxic and harmless carbon dioxide and water at a relatively low temperature through specific catalyst materials, without causing secondary pollution, without the need to replace consumables, and even without fire during the catalytic combustion process, which is a safe and ideal technical solution for oil and gas purification equipment.

[0004] The existing catalytic combustion equipment usually needs a high temperature of 400 DEG C or higher to make the catalyst achieve an ideal purification efficiency. In addition, due to the unstable concentration of pollutant gas, in order to maintain a high purification efficiency, the equipment needs to be always kept at a high operating temperature. The high temperature maintenance of the existing equipment needs electric heating or other external energy supply heating, which not only causes a large amount of energy waste, but also brings certain safety hazards due to the high operating temperature. SUMMARY

[0005] In order to solve the problem that the catalytic combustion equipment in the prior art needs a high temperature of 400 DEG C or above to make the catalyst achieve ideal purification efficiency, and in order to maintain a high purification efficiency, the equipment needs to be kept at a high operating temperature all the time due to the instability of the concentration of pollutant gas, the high temperature maintenance of the existing equipment needs electric heating or other external energy supply heating, which not only causes a large amount of energy waste, but also brings certain safety hazards due to the high operating temperature, the present application provides a self-heating maintenance type catalytic purification equipment for VOCs pollutants of a port terminal.

[0006] The application provides a self-heating maintenance type catalytic purification equipment for VOCs pollutants of a port terminal, which comprises an air inlet pipe, an air outlet pipe, a purification cylinder, a catalytic pipe and an air inlet partition plate.

[0007] By adopting the monolithic porous catalyst material, the catalytic ignition temperature of oil and gas pollutants can be reduced to below 400 DEG C, the catalytic pipe arranged on the axis of the purification cylinder forms a double-layer reflux structure, the heat released in the catalytic oxidation reaction process in the central axis space is used to heat the gas flowing into the purification cylinder from the outer ring space, the self-heating maintenance of the catalytic oxidation reaction can be realized, after the equipment is started, the high temperature of the equipment does not need to be maintained by continuous electric heating or external energy supply heating, energy waste is reduced, the safety hazard caused by high temperature operation is reduced, the central heat source is used to heat the outer ring gas, a separate heat exchanger structure is not needed, the structure is simple and stable.

[0008] Optionally, the air inlet partition plate is arranged between the catalytic pipe and the purification cylinder and is uniformly distributed, the outer ring space is uniformly divided into a plurality of outer ring sub-spaces, the air inlet pipe is branched into at least two air inlet branch pipes, the number of the air inlet branch pipes corresponds to the number of the outer ring sub-spaces, and each air inlet branch pipe is communicated with the corresponding outer ring sub-space at the second end of the purification cylinder.

[0009] Optionally, the heating element and the temperature sensor are arranged in each outer ring sub-space, the front end of the air inlet pipe is connected with a gas flow detector and a gas concentration detector, the air inlet pipe is connected with an air pipeline provided with a gas flow controller, the air outlet pipe is provided with a pollutant concentration sensor, and the heating element, the temperature sensor, the gas flow detector, the gas concentration detector, the gas flow controller and the pollutant concentration sensor are connected to a system.

[0010] By setting the gas flow detector and gas concentration detector in the device, the required reaction temperature and oxygen concentration can be automatically calculated according to the gas flow and gas concentration, so that the device can automatically set the appropriate initial reaction temperature, and automatically add the corresponding amount of air according to the concentration change, so as to ensure the complete catalytic oxidation reaction, further improve the catalyst life, and reduce the operation temperature and danger of the device under the premise of ensuring the purification efficiency.

[0011] Optionally, during the catalytic reaction of the pollutants in the catalytic pipe, the heat released by the reaction is absorbed and stored by the catalyst carrier and the catalytic pipe, and the heat is conducted to the pollutant gas in the outer ring space.

[0012] By using the heat released by the catalytic oxidation reaction to heat the inlet gas, the temperature of the pollutant gas can continuously meet the required temperature for catalytic oxidation, and self-heating maintenance can be achieved without continuous heating.

[0013] Optionally, the heating component in the outer ring space starts to work when the device starts, stops working when the purification reaction in the catalytic pipe starts, and starts to work when the pollutant concentration sensor in the outlet pipe detects an increase in the pollutant concentration.

[0014] Optionally, the shape of the purification cylinder includes at least one of a circular cylinder or a square cylinder.

[0015] Optionally, the catalytic pipe is internally provided with a whole porous catalyst loaded with active components on a cordierite honeycomb carrier or a foamed metal.

[0016] By using the modularly designed whole porous catalyst, not only the quantity can be adjusted, but also the problems of unstable purification efficiency, frequent replacement of adsorption materials, and secondary pollution caused by re-desorption of the adsorbed oil and gas from the activated carbon in the existing activated carbon adsorption type oil and gas purification treatment device can be avoided.

[0017] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application.

[0019] Fig. 1 is an external schematic view of a self-heating maintenance type catalytic purification device for VOCs pollutants at a port provided by an embodiment of the present application;

[0020] Fig. 2 is a sectional view of the self-heating maintenance type catalytic purification device for VOCs pollutants at a port along the axis of the purification cylinder provided by an embodiment of the present application;

[0021] Fig. 3 is an external schematic view of a self-heat maintaining catalytic purification device for VOCs pollutants of a port terminal according to another embodiment of the present application.

[0022] In the drawings, reference numerals:

[0023] 1, inlet pipe; 2, outlet pipe; 3, purification cylinder; 4, catalytic pipe; 5, inlet partition plate. DETAILED DESCRIPTION

[0024] The exemplary embodiments will be described in detail hereinbelow with reference to the drawings. In the following description, the same numbers refer to the same or similar elements unless otherwise represented. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they only represent examples of apparatuses and methods consistent with some aspects of the present application, as detailed in the appended claims.

[0025] The existing catalytic combustion device generally needs a high temperature of 400℃ or above to make the catalyst achieve an ideal purification efficiency. Moreover, due to the unstable concentration of pollutant gas, in order to maintain a high purification efficiency, the device needs to be kept at a high operating temperature all the time. The high temperature maintenance of the existing device needs electric heating or other external energy supply heating, which not only causes a large amount of energy waste, but also brings certain safety hazards due to the excessively high operating temperature.

[0026] In view of the problem that the high temperature maintenance of the existing device needs electric heating or other external energy supply heating, which not only causes a large amount of energy waste, but also brings certain safety hazards due to the excessively high operating temperature, the present application provides a self-heat maintaining catalytic purification device for VOCs pollutants of a port terminal. Figs. 1-3 The self-heat maintaining catalytic purification device for VOCs pollutants of a port terminal according to the present application will be described below.

[0027] As shown in Figs. 1-3 the self-heat maintaining catalytic purification device for VOCs pollutants of a port terminal, comprising: an inlet pipe 1, an outlet pipe 2, a purification cylinder 3, a catalytic pipe 4, and an inlet partition plate 5; the catalytic pipe 4 is located on the axis of the purification cylinder 3, and divides the purification cylinder 3 into a central axis space and an outer ring space; the central axis space and the outer ring space are communicated at a first end of the purification cylinder; the catalytic pipe 4 (i.e. the central axis space) is internally provided with a monolithic porous catalyst; the inlet pipe 1 is communicated with the outer ring space from a second end of the purification cylinder 3, and the outlet pipe 2 is communicated with the central axis space from the second end of the purification cylinder 3; the inlet partition plate 5 is arranged between the purification cylinder 3 and the catalytic pipe 4.

[0028] Optionally, the catalytic tube 4 and the purification cylinder 3 are provided with evenly distributed air inlet baffles 5, which evenly divide the outer ring space into a predetermined number of outer ring subspaces; the air inlet pipe 1 is branched into at least two air inlet branch pipes, the number of air inlet branch pipes corresponds to the number of outer ring subspaces, and each air inlet branch pipe communicates with the corresponding outer ring subspace from the second end of the purification cylinder 3.

[0029] The outer ring space is evenly divided, and the air inlet pipe 1 is divided into multiple air inlet branch pipes, so that the gas flowing into the outer ring space from the air inlet branch pipes is evenly distributed.

[0030] The gas containing VOCs pollutant components such as oil gas flows into the air inlet pipe 1, and then flows into each air inlet branch pipe through the air inlet pipe 1, and evenly flows into the outer ring space of the purification cylinder 3 from the second end of the purification cylinder 3, and flows into the catalyst in the central axis space at the first end of the purification cylinder 3, and flows out along the air outlet pipe 2 after being purified by the catalyst.

[0031] Each outer ring subspace is provided with a heating element and a temperature sensor; the front end of the air inlet pipe 1 is connected with a gas flow detector and a gas concentration detector, and the air inlet pipe 1 is connected with an air pipeline connected with a gas flow controller; the air outlet pipe 2 is provided with a pollutant concentration sensor; the heating element, the temperature sensor, the gas flow detector, the gas concentration detector, the gas flow controller, and the pollutant concentration sensor are connected to the system, and the system receives and analyzes the collected data.

[0032] Optionally, the heating element includes an electric heating wire, and the temperature sensor includes a thermocouple.

[0033] The gas flow detector is used to detect the pollutant flow of the front end flow in the air inlet pipe 1, and the gas concentration detector is used to detect the pollutant concentration of the front end flow in the air inlet pipe 1, and the system calculates the required catalytic temperature and oxygen concentration of the rear end reaction according to the pollutant flow and the pollutant concentration, and controls the air pipeline to be matched into the air inlet pipe 1 with a predetermined amount of air, adjusts the heating power in the outer ring space of the purification cylinder 3, and heats the gas in the outer ring space to the required temperature. The heated gas flows through the catalytic tube 4 from the first end of the purification cylinder 3, the pollutants are oxidized into chlorine dioxide and water, and are discharged through the air outlet pipe.

[0034] By setting the flow and concentration detection instruments in the equipment and connecting them with the system, the system can dynamically adjust according to the pollutant concentration of the inlet air according to the operating conditions of the equipment.

[0035] During the catalytic pollutant reaction in the catalytic tube 4, the heat released by the reaction is absorbed and stored by the catalyst carrier and the catalytic tube 4, and the heat is conducted to the pollutant gas in the outer ring space.

[0036] In practical application, the heating element in the outer space starts to work when the device starts, stops working when the purification reaction in the catalytic tube 4 starts, and starts to work when the pollutant concentration sensor in the outlet pipe 2 detects an increase in the pollutant concentration.

[0037] When the purification reaction starts, the heating module in the outer space can stop working, and the heat transferred by the catalytic tube 4 to the surrounding can make the temperature of the pollutant gas reach the required temperature for the catalytic reaction at all times.

[0038] When the pollutant concentration decreases, the heat released by the reaction also decreases, the overall reaction temperature decreases, and the system automatically restores the working state of the reduced temperature. The pollutant concentration sensor is provided in the outlet pipe 2, and when the pollutant concentration in the outlet pipe 2 is detected to increase, the heating module in the system is actively turned on to further increase the reaction temperature until the discharged gas after the reaction meets the standard.

[0039] In cooperation with the monitoring of the sensor, the heating module only needs to be started temporarily when the device starts or the purification efficiency decreases, and can be self-heated and maintained in most processes, avoiding energy waste.

[0040] The concentration, flow rate, and oxygen concentration of the pollutant are monitored, the initial reaction temperature is automatically set, and an appropriate amount of air is supplemented to promote the catalytic oxidation reaction.

[0041] Optionally, the shape of the purification cylinder 3 includes at least one of a circular cylinder or a square cylinder.

[0042] For example, the purification cylinder 3 of the circular cylinder and the catalytic tube 4 of the square tube are shown in this application, and the air inlet partition plate 5 is connected with the edges of the square tube, respectively, to divide the outer space into four outer sub-spaces.

[0043] In practical application, the purification cylinder 3 can be provided as a square cylinder, and the waste heat utilization can be achieved by using a plate-type cross structure. The purification cylinder 3 and the catalytic tube 4 can also be designed into other shapes according to actual needs, which will not be described here.

[0044] Optionally, the catalytic tube 4 is internally provided with a whole porous catalyst loaded with cordierite honeycomb carriers or foamed metal active components, and the whole porous catalyst is modularly designed and the number is adjustable. The low-temperature catalytic oxidation material used in this embodiment can realize catalytic purification of VOCs of oil and gas pollutants in the port terminal, and can avoid the safety hidden trouble caused by excessively high operating temperature.

[0045] In summary, the self-heat maintaining type port wharf VOCs pollution catalytic purification equipment provided by the application can reduce the catalytic ignition temperature of oil and gas pollutants to below 400 DEG C by using the monolithic porous catalyst material, and can realize self-heat maintenance of the catalytic oxidation reaction by setting the catalytic tube on the axis of the purification cylinder to form a double-layer reflux structure, and by using the heat released in the internal catalytic oxidation reaction process to heat the gas flowing into the purification cylinder in the outer ring space, so that the high temperature of the equipment can be maintained without continuous electric heating or external energy supply after the equipment is started, thereby reducing energy waste and reducing the safety hazards caused by high temperature operation. The central heat source is used to heat the outer ring gas, and a separate heat exchanger structure is not needed, so that the equipment is simple in structure and high in stability.

[0046] In addition, by setting the gas flow detector and the gas concentration detector in the equipment, the required reaction temperature and oxygen concentration can be automatically calculated according to the gas flow and the gas concentration, so that the equipment can automatically set the appropriate initial reaction temperature, and automatically add the corresponding amount of air according to the concentration change, so as to ensure the complete catalytic oxidation reaction, further improve the service life of the catalyst, and reduce the operation temperature and the danger of the equipment under the premise of ensuring the purification efficiency.

[0047] In addition, by using the heat released by the catalytic oxidation reaction to heat the inlet gas, the temperature of the pollutant gas can continuously meet the required temperature for catalytic oxidation, and self-heat maintenance can be realized without continuous heating.

[0048] In addition, by using the monolithic porous catalyst designed in a modular manner, not only the quantity can be adjusted, but also the problems of unstable purification efficiency, frequent replacement of adsorption materials and secondary pollution caused by the desorption of the activated carbon adsorbing oil and gas in the existing activated carbon adsorption type oil and gas purification treatment equipment can be avoided.

[0049] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0050] It should be understood that the application is not limited to the precise construction which has been described above and illustrated in the accompanying drawings and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is indicated only by the appended claims.

Claims

1. A self-sustaining catalytic device for the purification of VOCs pollutants in a port terminal, characterized by the fact that it comprises: The utility model relates to a kind of air purification device, including: Air inlet pipe, air outlet pipe, purification cylinder, catalytic pipe, air inlet baffle; The catalytic pipe is located on the axis of the purification cylinder, and divides the purification cylinder into central axis space and outer ring space;The central axis space and the outer ring space are communicated at the first end of the purification cylinder;The inside of the catalytic pipe is equipped with monolithic porous catalyst;The shape of the purification cylinder is circular cylinder or square cylinder;The inside of the catalytic pipe is equipped with monolithic porous catalyst of cordierite honeycomb carrier or foam metal load active component, and the monolithic porous catalyst is modular design; The air inlet pipe is communicated with the outer ring space from the second end of the purification cylinder, and the air outlet pipe is communicated with the central axis space from the second end of the purification cylinder; The air inlet baffle is arranged between the purification cylinder and the catalytic pipe;Uniformly distributed air inlet baffles are arranged between the catalytic pipe and the purification cylinder, and the outer ring space is evenly divided into a predetermined number of outer ring subspaces; The air inlet pipe branch is at least two air inlet branch pipes, and the number of the air inlet branch pipes corresponds to the number of the outer ring subspaces, and each air inlet branch pipe is communicated with the corresponding outer ring subspace from the second end of the purification cylinder; Each outer ring subspace is equipped with heating element and temperature sensor; The front end of the air inlet pipe is connected with gas flow detector and gas concentration detector, and the air inlet pipe is connected with air pipeline connected with gas flow controller; The air outlet pipe is equipped with pollutant concentration sensor; The heating element, the temperature sensor, the gas flow detector, the gas concentration detector, the gas flow controller and the pollutant concentration sensor are connected to the system, and the system receives and analyzes the collected data.

2. The catalytic purification apparatus for self-heating maintaining VOCs pollutants of a port wharf according to claim 1, characterized in that, During the catalytic pollutant reaction in the catalytic pipe, the heat released by the reaction is absorbed and stored by the catalyst carrier and the catalytic pipe, and the heat is conducted to the pollutant gas in the outer ring space.

3. The catalytic device for the abatement of VOCs pollutants from port terminals, according to claim 2, characterized in that, The heating element in the outer ring space starts to work when the equipment starts, stops working when the purification reaction in the catalytic pipe starts, and starts to work when the pollutant concentration sensor in the air outlet pipe detects that the pollutant concentration increases.

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