CN110508127B

CN110508127B - VOCs handles with high-efficient heat accumulation formula catalytic oxidation reactor

Info

Publication number: CN110508127B
Application number: CN201910755279.7A
Authority: CN
Inventors: 骆光雷; 侯荣; 王庆欢; 王刚; 韩青
Original assignee: Yanqi Jinhe Mountain Environmental Protection Technology Co ltd; Xinjiang Mountain Jin He Energy Science Co ltd
Current assignee: Yanqi Jinhe Mountain Environmental Protection Technology Co ltd; Xinjiang Mountain Jin He Energy Science Co ltd
Priority date: 2019-08-15
Filing date: 2019-08-15
Publication date: 2021-09-10
Anticipated expiration: 2039-08-15
Also published as: CN110508127A

Abstract

The invention relates to the technical field of VOCs (volatile organic compounds) gas treatment equipment, and discloses a high-efficiency heat accumulating type catalytic oxidation reactor for VOCs treatment, which comprises a reaction tank, wherein partition plates are arranged on the upper part and the lower part of an inner cavity of the reaction tank, the inner cavity of the reaction tank is divided into an air inlet cavity on the upper part, a backflow cavity on the lower part and a heat insulation layer in the middle part by the two partition plates, a four-way valve is arranged at the top end of the reaction tank, a backflow pipe is arranged at the bottom end of the reaction tank, a reaction cavity is arranged in the heat insulation layer, a plurality of reaction cavities are arranged in the heat insulation layer and distributed in a honeycomb shape, a preheating pipe is arranged in each reaction cavity, the top end of each reaction cavity is communicated with the inner cavity of the air inlet cavity, and the bottom end of each reaction cavity is communicated with the bottom cavity of the heat insulation layer. According to the invention, the reaction cavity is sleeved with the preheating pipe, and the four-way valve and the return pipe are matched to exchange heat between the VOCs gas and the reacted VOCs gas, so that energy loss during multiple heat storage exchange is avoided, the reaction process can be continuously carried out without frequently switching valves, and thus, the use, maintenance and replacement of vulnerable parts are avoided.

Description

VOCs handles with high-efficient heat accumulation formula catalytic oxidation reactor

Technical Field

The invention relates to the technical field of VOCs (volatile organic compounds) gas treatment equipment, in particular to a high-efficiency heat accumulating type catalytic oxidation reactor for VOCs treatment.

Background

VOCs, i.e., volatile organic compounds, are defined as organic compounds having a saturated vapor pressure at room temperature of greater than 70Pa and a boiling point at atmospheric pressure of 260 ℃ or less, or all organic compounds having a corresponding volatility with a vapor pressure at 20 ℃ of greater than or equal to 10 Pa. The aerosol is directly discharged into the atmosphere, so that the atmospheric oxidation is easily enhanced, the aerosol is formed by converting air particles, the visibility (dust haze) is influenced, and meanwhile, the health of a respiratory system of a human body is influenced, so that diseases such as poisoning and carcinogenesis are caused. Common treatment technologies for VOCs include activated carbon adsorption, regenerative combustion, catalytic combustion, low-temperature plasma, photocatalyst purification, biological filter, absorption, condensation, membrane separation, and the like. The regenerative combustion method is RTO, VOCs in the waste gas are thermally oxidized and cracked and heat is released to heat the heat accumulator, and the heated heat accumulator heats the low-temperature waste gas to be treated, so that fuel consumption required by waste gas temperature rise is saved. The equipment used by the RTO is a heat accumulating type oxidizer, which adopts a heat accumulator which is arranged in a furnace body and has the function similar to that of a heat exchanger of heat accumulating ceramics and the like, when waste gas passes through the heat accumulator, the gas passes through the filler alternately through continuous cold and heat exchange, and heat exists in the filler in the process of transferring, thereby achieving the purposes of purifying organic waste gas and saving energy at the same time.

At present, use through the rotary valve to a plurality of cavities in turn in the rotation type RTO, switching frequency is higher, so require highly to the structure of valve, the valve belongs to easily trouble spare, and the maintenance or change more difficult, on the other hand, because the catalyst in the reacting chamber is easily poisoned, traditional RTO's enclosed construction is also loaded down with trivial details to the change of catalyst, consequently provides a VOCs handles with high-efficient heat accumulation formula catalytic oxidation reactor, aims at solving above-mentioned problem.

Disclosure of Invention

Aiming at the defects of the existing high-efficiency heat accumulating type catalytic oxidation reactor for treating VOCs in the background technology in the using process, the invention provides the high-efficiency heat accumulating type catalytic oxidation reactor for treating VOCs, which has the advantages of simple structure, low valve control requirement, high heat exchange efficiency and convenient catalyst replacement and solves the problems in the background technology.

The invention provides the following technical scheme: a high-efficiency heat accumulating type catalytic oxidation reactor for treating VOCs (volatile organic compounds) comprises a reaction tank, wherein partition plates are arranged on the upper portion and the lower portion of an inner cavity of the reaction tank, the two partition plates divide the inner cavity of the reaction tank into an air inlet cavity on the upper portion, a backflow cavity on the lower portion and a heat insulation layer on the middle portion, a four-way valve is arranged at the top end of the reaction tank, a backflow pipe is arranged at the bottom end of the reaction tank, a reaction cavity is arranged inside the heat insulation layer, a plurality of reaction cavities are arranged in the heat insulation layer and distributed in a honeycomb shape, a preheating pipe is arranged inside the reaction cavity, the top end of the reaction cavity is communicated with the inner cavity of the air inlet cavity, the bottom end of the reaction cavity is communicated with the bottom cavity of the heat insulation layer, the top end of the preheating pipe extends out of the reaction tank, the bottom end of the preheating pipe is communicated with the inner cavity of the backflow cavity, the bottom end of the four-way valve is communicated with the inner cavity of the backflow cavity, the other end of the return pipe is communicated with the bottom cavity of the heat preservation layer, and the inner wall of the reaction cavity is provided with an electric heating pipe.

Preferably, the preheating pipe is movably sleeved in the reaction cavity, and the outer surface of the preheating pipe, which is positioned in the inner cavity of the reaction cavity, is coated with a VOCs gas reaction catalyst.

Preferably, the fracture shapes of the reaction cavity and the preheating pipe are both regular hexagons.

Preferably, six corners of the preheating pipe are fixedly connected with separation heat-conducting plates, the other ends of the separation heat-conducting plates are connected to the inner corners of the reaction chamber in a sliding mode, and the surfaces of the separation heat-conducting plates are coated with VOCs gas reaction catalysts.

Preferably, the electrothermal tube is installed at the lower half part of the reaction chamber.

The invention has the following beneficial effects:

1. according to the invention, the reaction cavity is sleeved with the preheating pipe, and the four-way valve and the return pipe are matched to exchange heat between the VOCs gas and the reacted VOCs gas, so that energy loss during multiple heat storage exchange is avoided, the reaction process can be continuously carried out without frequently switching valves, and thus, the use, maintenance and replacement of vulnerable parts are avoided.

2. According to the invention, the plurality of honeycomb-shaped reaction chambers are arranged in the partition plate, the preheating pipe is sleeved in each reaction chamber, and the catalyst is coated on the outer surface of the preheating pipe, so that VOCs gas can be more fully subjected to heat exchange, the utilization rate of reaction waste heat is ensured, meanwhile, the catalyst on the preheating pipe can be greatly and conveniently replaced by disassembling and assembling the preheating pipe, and the working flow is simplified.

Drawings

FIG. 1 is a schematic cross-sectional view of the internal structure of the present invention;

FIG. 2 is a schematic cross-sectional view of the middle portion of FIG. 1 in accordance with the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2 according to the present invention.

In the figure: 1. a reaction tank; 2. a partition plate; 3. a heat-insulating layer; 4. an air inlet cavity; 5. a reflux cavity; 6. a four-way valve; 6a, an air inlet; 6b, an air outlet; 6c, a reflux port; 7. a heat recovery valve I; 8. a heat recovery valve II; 9. a return pipe; 10. a reaction chamber; 11. a preheating pipe; 12. an electric heating tube; 13. separating the thermally conductive plates.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-3, a high-efficiency heat accumulating type catalytic oxidation reactor for treating VOCs comprises a reaction tank 1, wherein partition plates 2 are respectively arranged at the upper part and the lower part of an inner cavity of the reaction tank 1, the inner cavity of the reaction tank 1 is divided into an air inlet cavity 4 at the upper part, a reflux cavity 5 at the lower part and a heat preservation layer 3 at the middle part by the two partition plates 2, a four-way valve 6 is arranged at the top end of the reaction tank 1, the four-way valve 6 comprises an air inlet 6a, an air outlet 6b and a left reflux port and a right reflux port 6c, the air inlet 6a is communicated with a VOCs gas inlet, the air outlet 6b is communicated with the inner cavity of the air inlet cavity 4, the left reflux port and the right reflux port 6c are communicated with the bottom of the inner cavity of the heat preservation layer 3 through a three-way pipe, the other air port of the three-way pipe is communicated with the inner cavity of the reflux cavity 5 through a reflux pipe 9, a reflux valve I7 and a reflux valve II 8 are respectively arranged at the upper part and the lower part of the three-way pipe, and the reflux valve I7 control the three-way pipe is communicated with the reflux port 6c, the heat-returning valve II 8 controls the three-way pipe to be communicated with the gas circuit of the return pipe 9, the four-way valve of the four-way valve 6 actually only can be opened and closed by a valve to open and close the channels of the gas inlet 6a and the gas outlet 6b, the return ports 6c on the two sides can be communicated with the return ports 6c all the time, a reaction cavity 10 is arranged in the heat-insulating layer 3, the reaction cavity 10 is distributed in the heat-insulating layer 3 in a honeycomb manner, the upper part of the reaction cavity 10 is communicated with the inner cavity of the gas inlet cavity 4, the lower part of the reaction cavity 10 is communicated with the gas cavity between the heat-insulating layer 3 and the lower part of the partition plate 2, the gas cavity is communicated with one end of the three-way pipe, a preheating pipe 11 is sleeved in the reaction cavity 10, the bottom end of the preheating pipe 11 penetrates through the heat-insulating layer 3 and is communicated with the inner cavity of the return cavity 5, the top end of the preheating pipe 11 penetrates through the top end of the reaction tank 1 and is communicated with a VOCs gas equipment exhaust port (not shown in the figure), an electric heating pipe 12 is arranged on the inner wall of each reaction cavity 10, the electrical heating tube 12 is used for heating the VOCs gas in a compensation manner to promote the VOCs gas to reach a reaction temperature.

From this, admit air by air inlet 6a, the gaseous back that admits air chamber 4 that admits air of VOCs, pass through reaction chamber 10 again in proper order, the three-way pipe, back flow 9, backward flow chamber 5, preheating tube 11 to outside, in the interim, the VOCs gas that admits air chamber 4 after-reaction by the entering carries the heat, lead back to in the preheating tube 11 by the back flow 9 again, subsequent supplementary VOCs gas to in the reaction chamber 10 heats, in order to improve heat utilization ratio, simultaneously, by the electrothermal tube 12 gaseous compensatory heating again of VOCs after preheating, so that VOCs gas reaches reaction temperature. When preventing the start-up, the gaseous heating stroke of VOCs is short, can close heat recovery valve II 8, opens heat recovery valve I7 for the gaseous leading-in of VOCs of initial stage returns cross valve 6 and reentries into the chamber 4 that admits air, and after equipment operation is normal, close heat recovery valve I7, open heat recovery valve II 8 can.

Wherein, for making the gaseous heat exchange of VOCs more abundant, all establish reaction chamber 10 and preheating tube 11's fracture into regular hexagon, and six angles departments of preheating tube 11 all establish and separate heat-conducting plate 13, the spout slip joint of the interior angle setting of the other end preheating tube 11 of separating heat-conducting plate 13, separate the inner chamber of reaction chamber 10 for six littleer cavities by separating heat-conducting plate 13, in order to improve area of contact, and through at the surface of preheating tube 11 with separate heat-conducting plate 13 on the surface installation catalyst, can make catalytic oxidation reaction go on in reaction chamber 10, establish preheating tube 11 into detachable installation simultaneously, can put in order to change preheating tube 11 and the catalyst of separating poisoning on the heat-conducting plate 13.

Wherein, in order to maximize the use of heat, the electrothermal tube 12 is installed at the lower half part of the reaction chamber 10, and the catalyst coating amount on the outer surface of the preheating tube 11 is based on the top end of the electrothermal tube 12, and the catalyst content on the outer surface of the preheating tube 11 at the same height section as the electrothermal tube 12 is more than 2 times of that at the non-same height section.

In order to facilitate the installation of the preheating pipe 11, the invention provides an installation mode, namely the preheating pipe 11 is inserted from the upper part of the reaction tank 1, and the lower part of the preheating pipe 11 is screwed and fixed by nuts, the contact part of the upper part of the preheating pipe 11 and the top end opening of the reaction tank 1 and the contact part of the bottom of the preheating pipe 11 and the opening of the partition plate 2 are sealed by silica gel gaskets, in order to simplify the installation, a thin plate can be fixedly sleeved outside the preheating pipe 11, a notch is arranged at the corresponding position of the top end of the reaction tank 1, the thin plate is lapped on the top edge of the notch of the reaction tank 1, and the sealing is assisted by the silica gel gaskets, so after the preheating pipe 11 is inserted, the lower nuts are screwed, and the upper and lower parts can achieve the fastening and sealing effects.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a VOCs handles with high-efficient heat accumulation formula catalytic oxidation reactor, includes retort (1), its characterized in that: the upper lower part of the inner cavity of the reaction tank (1) is provided with partition plates (2), the two partition plates (2) separate the inner cavity of the reaction tank (1) into an air inlet cavity (4) at the upper part, a reflux cavity (5) at the lower part and a heat preservation layer (3) at the middle part, the top end of the reaction tank (1) is provided with a four-way valve (6), the bottom end of the reaction tank (1) is provided with a reflux pipe (9), the inside of the heat preservation layer (3) is provided with a reaction cavity (10), the reaction cavity (10) is provided with a plurality of heat preservation layers (3) and is in honeycomb distribution, the inside of the reaction cavity (10) is provided with a preheating pipe (11), the top end of the reaction cavity (10) is communicated with the inner cavity of the air inlet cavity (4), the bottom end of the reaction cavity (10) is communicated with the bottom cavity of the heat preservation layer (3), the top end of the preheating pipe (11) extends out of the outer part of the reaction tank (1), and the bottom end of the preheating pipe (11) is communicated with the inner cavity of the reflux cavity (5), the bottom end of the four-way valve (6) is communicated with the inner cavity of the air inlet cavity (4), one end of the return pipe (9) is communicated with the inner cavity of the return cavity (5), the other end of the return pipe (9) is communicated with the bottom cavity of the heat insulation layer (3), and the inner wall of the reaction cavity (10) is provided with an electric heating pipe (12);

the preheating pipe (11) is movably sleeved in the reaction cavity (10), and the outer surface of the preheating pipe (11) positioned in the inner cavity of the reaction cavity (10) is coated with a VOCs gas reaction catalyst;

the fracture shape of reaction chamber (10) and preheater tube (11) is regular hexagon, heat-conducting plate (13) is separated to six equal fixedly connected with in angle of preheater tube (11), the other end sliding connection who separates heat-conducting plate (13) is in the interior angle department of reaction chamber (10), the surface coating of separating heat-conducting plate (13) has VOCs gaseous reaction catalyst.

2. The reactor of claim 1, wherein the reactor comprises: the electrothermal tube (12) is arranged at the lower part of the reaction cavity (10).