Storage tank waste gas collection and treatment equipment

Abstract

The utility model discloses storage tank waste gas collection and treatment equipment which comprises a waste gas pretreatment system, a heat storage type high-temperature oxidation furnace and an absorption tower, after secondary air mixing, the gas passes through a flame arrester at the front end of the heat accumulating type high-temperature oxidation furnace and then enters the heat accumulating type high-temperature oxidation furnace to be incinerated, and the gas flowing through the heat accumulating type high-temperature oxidation furnace is exhausted from a chimney through an absorption tower; the heat accumulating type high-temperature oxidation furnace comprises a first heat accumulating chamber, a second heat accumulating chamber, a third heat accumulating chamber and an oxidation incineration chamber, and the oxidation incineration chamber is located above the first heat accumulating chamber, the second heat accumulating chamber and the third heat accumulating chamber. The heat accumulating type high-temperature oxidation furnace is arranged, the heat accumulating type high-temperature oxidation furnace is composed of three heat accumulating chambers and one oxidation chamber, the three heat accumulating chambers respectively execute the heat absorbing function, the heat releasing function and the cleaning function in turn, the combustion efficiency is high, and purification is thorough.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas collection and treatment, in particular to a storage tank waste gas collection and treatment device. Background Art

[0002] Organic waste gas treatment refers to the treatment of organic waste gas generated in the industrial production process by adsorbing, filtering and purifying. Usually, organic waste gas treatment includes formaldehyde organic waste gas treatment, benzene, toluene, xylene, etc. Due to the large emission volume, complex and diverse components, and pollution, resource and social nature, it needs to be harmless, resource-based, reduced and socialized. If it is not properly handled, it will pollute the environment and waste resources. At present, the treatment of organic waste gas generated in some factory areas (loading platforms) has problems such as incomplete waste gas purification, low combustion efficiency of purification equipment, low heat recovery efficiency, high failure rate, inconvenient maintenance and high operating costs. Utility Model Content

[0003] The purpose of the utility model is to provide a method to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a storage tank waste gas collection and treatment equipment, including a waste gas pretreatment system, a regenerative high-temperature oxidation furnace and an absorption tower. The waste gas passes through the molecular sieve of the waste gas pretreatment system to adsorb high-concentration waste gas, passes through the secondary mixed air and then passes through the flame arrester at the front end of the regenerative high-temperature oxidation furnace to enter the regenerative high-temperature oxidation furnace for incineration. The gas flowing through the regenerative high-temperature oxidation furnace is discharged from the chimney through the absorption tower. The regenerative high-temperature oxidation furnace is a three-bed structure, and the regenerative high-temperature oxidation furnace includes a first regenerative chamber, a second regenerative chamber, a third regenerative chamber and an oxidation incineration chamber. The oxidation incineration chamber The first heat storage chamber is located above the second heat storage chamber and the third heat storage chamber, and the oxidation incineration chamber is communicated with the three heat storage chambers. The oxidation incineration chamber is connected with a burner. Ceramic heat storage bodies are placed inside the first heat storage chamber, the second heat storage chamber and the third heat storage chamber. The bottoms of the first heat storage chamber, the second heat storage chamber and the third heat storage chamber are all connected with an air inlet pipe and an air outlet pipe. The air inlet pipe is connected through a main pipe, and a switching valve is arranged on the air inlet pipe. The other end of the air inlet pipe is connected with a fan. The air outlet pipe is connected through a discharge main pipe, and a switching valve is arranged on the air outlet pipe. The other end of the air outlet pipe is connected with an absorption tower.

[0005] Preferably, the bottoms of the first heat storage chamber, the second heat storage chamber and the third heat storage chamber are also connected to a heat bypass pipe, and the other end of the heat bypass pipe is connected to the main pipe of the air intake pipe.

[0006] Preferably, the oxidation incineration chamber is connected to a high-temperature exhaust pipe, a high-temperature exhaust valve is provided on the high-temperature exhaust pipe, and the other end of the high-temperature exhaust pipe is connected to an exhaust pipe.

[0007] Preferably, an air mixing box is provided at the air inlet of the regenerative high temperature oxidation furnace.

[0008] Preferably, an explosion relief plate is provided on the top of the furnace body of the regenerative high-temperature oxidation furnace.

[0009] Preferably, the ceramic heat storage body is divided into a two-layer structure, and the air balancing plate of the static pressure chamber of the air inlet is filled with honeycomb ceramics, and the saddle-horse type ceramic filler is laid on it.

[0010] Preferably, the first heat storage chamber, the second heat storage chamber and the third heat storage chamber are connected with a purge pipe.

[0011] Preferably, the first heat storage chamber, the second heat storage chamber, the third heat storage chamber and the oxidative incineration chamber are insulated with refractory aluminum silicate fiber, and the internal insulation has three layers, including two layers of aluminum silicate fiber felt and one layer of aluminum silicate fiber module. A heat-resistant steel frame is arranged in the aluminum silicate fiber module and fixed to the furnace shell with anchors.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model sets up a regenerative high-temperature oxidation furnace, which is composed of three regenerative chambers and one oxidation chamber. The three regenerative chambers respectively perform heat absorption, heat release and cleaning functions, which are performed in turn, with high combustion efficiency and thorough purification. A new type of honeycomb ceramic carrier is used as a heat storage material, which has good heat storage effect, small resistance and long service life. The heat recovery efficiency is as high as 95% or more, the purification efficiency is as high as 99%, and the heat storage combustion method is adopted; regular ceramics are used as heat storage bodies, with high heat recovery rate, stable and reliable operation, low failure rate, simple maintenance and low operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the air intake of the first heat storage chamber, the air outlet of the second heat storage chamber, and the purge of the third heat storage chamber of the utility model.

[0015] Figure 2 It is a schematic diagram of the first heat storage chamber purging, the second heat storage chamber air intake, and the third heat storage chamber air outlet of the utility model.

[0016] Figure 3 It is a schematic diagram of the first heat storage chamber exhaust, the second heat storage chamber purge, and the third heat storage chamber intake of the utility model.

[0017] Figure 4 It is a schematic diagram of the working process of the utility model.

[0018] In the figure: 1. Regenerative high-temperature oxidation furnace; 2. Absorption tower; 3. First regenerative chamber; 4. Second regenerative chamber; 5. Third regenerative chamber; 6. Oxidation incineration chamber; 7. Burner; 8. Ceramic regenerative body; 9. Air inlet pipe; 10. Air outlet pipe; 11. Heat bypass pipe; 12. High-temperature discharge pipe; 13. Fan. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figure 1-4 The utility model provides a technical solution for storage tank waste gas collection and treatment equipment: it includes a waste gas pretreatment system, a regenerative high-temperature oxidation furnace 1 and an absorption tower 2. The waste gas passes through the molecular sieve of the waste gas pretreatment system to absorb high-concentration waste gas, passes through the secondary mixed air, and then passes through the flame arrester at the front end of the regenerative high-temperature oxidation furnace 1 to enter the regenerative high-temperature oxidation furnace 1 for incineration. The gas flowing through the regenerative high-temperature oxidation furnace 1 is discharged from the chimney through the absorption tower 2. The regenerative high-temperature oxidation furnace 1 is a three-bed structure. The regenerative high-temperature oxidation furnace includes a first regenerative chamber 3, a second regenerative chamber 4, a third regenerative chamber 5 and an oxidation incineration chamber 6. The oxidation incineration chamber 6 is located between the first regenerative chamber 3 and the second Above the heat storage chamber 4 and the third heat storage chamber 5, the oxidation incineration chamber 6 is communicated with the three heat storage chambers, the oxidation incineration chamber 6 is connected with a burner 7, and ceramic heat storage bodies 8 are placed inside the first heat storage chamber 3, the second heat storage chamber 4, and the third heat storage chamber 5. The bottoms of the first heat storage chamber 3, the second heat storage chamber 4, and the third heat storage chamber 5 are all connected with an air inlet pipe 9 and an air outlet pipe 10, the air inlet pipe 9 is connected through a main pipe, and a switching valve is provided on the air inlet pipe 9, the other end of the air inlet pipe 9 is connected with a fan 13, the air outlet pipe 10 is connected through a discharge main pipe, a switching valve is provided on the air outlet pipe 10, and the other end of the air outlet pipe 10 is connected to the absorption tower 2.

[0021] The bottom of the first heat storage chamber 3, the second heat storage chamber 4, and the third heat storage chamber 5 are also connected to a heat bypass pipe 11, and the other end of the heat bypass pipe 11 is connected to the main pipe of the air intake pipe 9. If the high temperature setting temperature of the regenerative high-temperature oxidation furnace is exceeded, the excess heat is mixed with the exhaust gas in the form of hot air through the heat bypass pipe and then introduced into the regenerative high-temperature oxidation furnace.

[0022] A high-temperature emission pipe 12 is connected to the oxidation incineration chamber 6, and a high-temperature emission valve is provided on the high-temperature emission pipe 12. The other end of the high-temperature emission pipe 12 is connected to the gas outlet pipe 10. When the temperature of the oxidation incineration chamber 6 reaches the high temperature of the oxidation chamber, it indicates that the VOC concentration in the exhaust gas is too high. At this time, the high-temperature emission valve is opened to discharge the excess heat directly to the chimney.

[0023] A mixing box is provided at the air inlet of the regenerative high-temperature oxidation furnace 1 to make the exhaust gas concentration relatively stable and avoid flash explosion. An explosion relief plate is provided on the top of the furnace body of the regenerative high-temperature oxidation furnace 1 to ensure that the temperature and explosion can be safely vented when the concentration is too high and the temperature in the furnace is too high or an explosion occurs.

[0024] The ceramic heat storage body 8 is divided into a two-layer structure. The air intake static pressure chamber wind plate is filled with honeycomb ceramics, and the saddle horse type ceramic filler is laid on it, which has the functions of high temperature impact resistance and wind equalization.

[0025] The first heat storage chamber 3, the second heat storage chamber 4, and the third heat storage chamber 5 are connected with a purge pipe. The first heat storage chamber 3, the second heat storage chamber 4, the third heat storage chamber 5 and the oxidation incineration chamber 6 are internally insulated with refractory aluminum silicate fiber. The internal insulation has three layers, including two layers of aluminum silicate fiber felt and one layer of aluminum silicate fiber module. A heat-resistant steel frame is arranged in the aluminum silicate fiber module and fixed to the furnace shell with anchors.

[0026] Working principle: the waste gas enters from the regenerative high temperature oxidation furnace 1, and an infrared combustible gas detector is installed at the inlet. The combustible gas is set to 25% LEL, and 50% LEL reaches the high limit alarm. After the alarm, the pneumatic cut-off valve automatically closes the system air intake, and the external exhaust valve automatically opens to ensure normal ventilation. The fresh air valve is fully opened and the burner is fully closed, and the regenerative high temperature oxidation furnace system performs fresh air cooling. If the waste gas does not reach 50% LEL (high limit), it can be introduced into the system for normal treatment.

[0027] The organic waste gas to be treated passes through the filter flame arrester and then enters the ceramic medium layer of the first heat storage chamber 3 through the induced draft fan (the ceramic medium "stores" the heat from the previous cycle). The ceramic releases heat and the temperature decreases, while the organic waste gas absorbs heat and the temperature increases. After leaving the heat storage chamber, the waste gas enters the oxidation chamber at a higher temperature. At this time, the temperature of the waste gas depends on the volume of the ceramic heat storage body 8, the waste gas flow rate and the geometric structure of the ceramic heat storage body 8.

[0028] In the oxidation incineration chamber 6, the organic waste gas is then supplemented by the burner and heated to the set oxidation temperature. The organic matter therein is oxidized and decomposed into carbon dioxide and water. Since the waste gas has been preheated in the first heat storage chamber 3, the fuel consumption of the burner is greatly reduced. The oxidation chamber has two functions: one is to ensure that the waste gas can reach the set oxidation temperature, and the other is to ensure that there is enough residence time to fully oxidize the VOC in the waste gas. The residence time designed for this project is 2.0 seconds. Residence time (t) = V (combustion chamber volume) * T temperature under standard conditions / V volume flow of waste gas under standard conditions * T combustion chamber temperature.

[0029] The waste gas flows through the first regenerator 3 and then heats up before entering the oxidation incineration chamber 6. After becoming purified high-temperature gas, it leaves the oxidation incineration chamber 6 and enters the second regenerator 4 (which has been cooled in the previous cycle, and the third regenerator 5 is in the purification state at this time), releases heat, and is discharged after cooling down. The second regenerator 4 absorbs a large amount of heat and then heats up (for heating the waste gas in the next cycle). The treated gas leaves the second regenerator 4 and is discharged into the atmosphere through the exhaust fan.

[0030] After the cycle is completed, the inlet and outlet valves are switched once and enter the next cycle. The exhaust gas enters the second regenerator 4 and is discharged from the third regenerator 5. Before switching, the purified gas is cleaned through the backflush pipe to clean the first regenerator 3 and purge the organic matter remaining in the pipeline and the room. This can make the exhaust gas purification rate higher, reaching more than 99%, and the valves of the three regenerators operate alternately.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0032] 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. A storage tank waste gas collection and treatment device, comprising a waste gas pretreatment system, a regenerative high temperature oxidation furnace (1) and an absorption tower (2), wherein the waste gas passes through a molecular sieve of the waste gas pretreatment system to adsorb high-concentration waste gas, passes through a secondary mixed air, and then passes through a flame arrester at the front end of the regenerative high temperature oxidation furnace (1) before entering the regenerative high temperature oxidation furnace (1) for incineration, and the gas flowing through the regenerative high temperature oxidation furnace (1) is discharged from a chimney through the absorption tower (2), characterized in that: The regenerative high-temperature oxidation furnace (1) is a three-bed structure, comprising a first regenerative chamber (3), a second regenerative chamber (4), a third regenerative chamber (5) and an oxidation incineration chamber (6), wherein the oxidation incineration chamber (6) is located above the first regenerative chamber (3), the second regenerative chamber (4) and the third regenerative chamber (5), and the oxidation incineration chamber (6) is communicated with the three regenerative chambers, and the oxidation incineration chamber (6) is connected to a burner (7), wherein the first regenerative chamber (3), the second regenerative chamber (4) and the third regenerative chamber (5) are connected to the burner (7), and the first regenerative chamber (3), the second regenerative chamber (4) and the third regenerative chamber (5) are connected to the burner (7), wherein ... A ceramic heat storage body (8) is placed inside, and the bottoms of the first heat storage chamber (3), the second heat storage chamber (4), and the third heat storage chamber (5) are all connected to an air inlet pipe (9) and an air outlet pipe (10), the air inlet pipe (9) is connected via a main pipe, and a switching valve is provided on the air inlet pipe (9), and the other end of the air inlet pipe (9) is connected to a fan (13), and the air outlet pipe (10) is connected via a discharge main pipe, and a switching valve is provided on the air outlet pipe (10), and the other end of the air outlet pipe (10) is connected to an absorption tower (2); The bottoms of the first heat storage chamber (3), the second heat storage chamber (4) and the third heat storage chamber (5) are also connected to a heat bypass pipe (11), and the other end of the heat bypass pipe (11) is connected to the main pipe of the air intake pipe (9); The oxidation incineration chamber (6) is connected to a high-temperature discharge pipe (12), a high-temperature discharge valve is provided on the high-temperature discharge pipe (12), and the other end of the high-temperature discharge pipe (12) is connected to an outlet pipe (10); The ceramic heat storage body (8) has a two-layer structure, the air intake static pressure chamber wind plate is filled with honeycomb ceramics, and the saddle horse type ceramic filler is laid on top.

2. A storage tank waste gas collection and treatment equipment according to claim 1, characterized in that: An air mixing box is provided at the air inlet of the regenerative high-temperature oxidation furnace (1).

3. The storage tank waste gas collection and treatment equipment according to claim 1 is characterized in that: The top of the furnace body of the regenerative high-temperature oxidation furnace (1) is provided with an explosion relief plate.

4. The storage tank waste gas collection and treatment equipment according to claim 1 is characterized in that: The first heat storage chamber (3), the second heat storage chamber (4) and the third heat storage chamber (5) are connected to a purge pipe.

5. The storage tank waste gas collection and treatment equipment according to claim 1 is characterized in that: The first heat storage chamber (3), the second heat storage chamber (4), the third heat storage chamber (5) and the oxidation incineration chamber (6) are internally insulated using refractory aluminum silicate fibers. The internal insulation has three layers, including two layers of aluminum silicate fiber felt and one layer of aluminum silicate fiber module.

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