CN212594995U

CN212594995U - VOCs processing apparatus of minimum emission

Info

Publication number: CN212594995U
Application number: CN202020794955.XU
Authority: CN
Inventors: 孙万存; 孙万启
Original assignee: Beijing Sharing Environment Engineering Co ltd
Current assignee: Beijing Sharing Environment Engineering Co ltd
Priority date: 2020-05-13
Filing date: 2020-05-13
Publication date: 2021-02-26
Anticipated expiration: 2030-05-13

Abstract

The utility model relates to the technical field of waste gas treatment, and discloses a VOCs treatment device with ultralow emission, which comprises an absorption tower set, VOCs gas flows out of the absorption tower set and then enters a main pipeline, a combustible gas detector, an air blower and a main pipeline valve are sequentially arranged on the main pipeline, and the VOCs gas flows out of the main pipeline and then enters catalytic oxidation equipment for catalytic oxidation treatment and tail gas discharge; the upstream end of the bypass branch is communicated with the main pipeline, the communication position of the bypass branch and the main pipeline is positioned at the downstream side of the blower, and the downstream end of the bypass branch is communicated with an exhaust pipe of the catalytic oxidation equipment; and a bypass valve is arranged on the bypass branch, and the bypass valve and the main pipeline valve are controlled to be opened or closed according to the numerical value fed back by the combustible gas detector. When the concentration of the combustible gas exceeds the limit value, closing the main pipeline valve and opening the bypass valve to ensure the safety of the system; set up spark arrester, water-sealed tank on the trunk line, can effectively prevent the backfire, improve the holistic security of system.

Description

VOCs processing apparatus of minimum emission

Technical Field

The utility model relates to an exhaust-gas treatment technical field especially indicates a VOCs processing apparatus of ultralow emission.

Background

For organic solvents and fuels such as benzene, acetone, methanol, butanol, ethyl acetate, ethanol and the like, mainly organic matters volatilized and discharged in the operation process of vacuum pumps and storage tanks of pharmaceutical factories are strict in discharge requirements, the discharge requirements are difficult to achieve by common treatment methods, and even if an incineration method is applied, the method has great hidden dangers in safety.

SUMMERY OF THE UTILITY MODEL

The utility model provides a VOCs processing apparatus of ultralow emission has solved among the prior art problem that processing method security is poor and can not reach the emission requirement.

The technical scheme of the utility model is realized like this: a device for treating VOCs with ultralow emission comprises an absorption tower set, VOCs gas flows out of the absorption tower set and then enters a main pipeline, a combustible gas detector, an air blower and a main pipeline valve are sequentially arranged on the main pipeline, and the VOCs gas flows out of the main pipeline and then enters catalytic oxidation equipment for catalytic oxidation treatment and tail gas discharge; the upstream end of the bypass branch is communicated with the main pipeline, the communication position of the bypass branch and the main pipeline is positioned at the downstream side of the blower, and the downstream end of the bypass branch is communicated with an exhaust pipe of the catalytic oxidation equipment; and a bypass valve is arranged on the bypass branch, and the bypass valve and the main pipeline valve are controlled to be opened or closed according to a numerical value fed back by the combustible gas detector.

As a preferable technical scheme, the absorption tower group at least comprises a first-stage absorption tower and a second-stage absorption tower, the first-stage absorption tower and the second-stage absorption tower are arranged in series, and the VOCs gas sequentially flows through the first-stage absorption tower and the second-stage absorption tower.

As a preferred technical scheme, a fire retardant assembly is further arranged on the main pipeline, and the fire retardant assembly is located on the upstream side of the catalytic oxidation equipment.

As a preferred technical scheme, the fire retardant component at least comprises a fire retardant, the fire retardant is arranged between the main pipeline and the catalytic oxidation equipment, and the VOCs gas flows through the fire retardant and then enters the catalytic oxidation equipment.

As a preferred technical scheme, the device also comprises a water-sealed tank, wherein the water-sealed tank is arranged between the flame arrester and the catalytic oxidation equipment, and VOCs gas flowing out of the flame arrester flows through the water-sealed tank and then enters the catalytic oxidation equipment.

Preferably, a plate heat exchanger, an electric heater and a catalyst are arranged in the catalytic oxidation device, and the VOCs gas is preheated at the plate heat exchanger, heated at the electric heater, and finally treated in the catalyst and then discharged.

Preferably, the exhaust gas discharged from the catalyst flows into the plate heat exchanger.

The beneficial effects of the utility model reside in that: the ultra-low emission VOCs treatment device absorbs high-concentration VOCs gas through the absorption tower set, so that the concentration of the VOCs gas is reduced; the combustible gas on-line detector detects the gas flowing out from the absorption tower set, and when the concentration of the combustible gas contained in the gas exceeds the limit value, the main pipeline valve is closed, and the bypass valve is opened to ensure the safety of the system. The catalytic oxidation equipment further carries out high-temperature oxidation treatment on the tail gas, and the discharged tail gas reaches below 1/3 of a stricter emission standard and reaches the safety standard of the petrochemical industry. Set up spark arrester, water-sealed tank on the trunk line, can effectively prevent the backfire, improve the holistic security of system.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic diagram of the present invention.

In the figure, 1-absorption tower group; 11-a first-stage absorption tower; 12-a secondary absorption column; 3-a combustible gas detector; 4-a blower; 5-a bypass valve; 6-main pipeline valve; 7-flame arrestors; 8-water sealing the tank; 9-a catalytic oxidation device; 91-plate heat exchanger; 92-an electric heater; 93-catalyst.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments, and the descriptions of these embodiments are used to help understanding the present invention, but do not constitute a limitation of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

A VOCs processing apparatus with ultra-low emission is shown in figure 1 and comprises an absorption tower set 1, wherein the absorption tower set 1 at least comprises a first-stage absorption tower 11 and a second-stage absorption tower 12, the first-stage absorption tower 11 and the second-stage absorption tower 12 are arranged in series, and VOCs gas flows through the first-stage absorption tower 11 and the second-stage absorption tower 12 in sequence. Of course, one absorption tower or three or more absorption towers can be arranged according to the actual requirement of tail gas purification.

VOCs gas flows into the main pipeline after flowing through the absorption tower set 1, the combustible gas detector 3, the air blower 4 and the main pipeline valve 6 are sequentially arranged on the main pipeline, and the VOCs gas flows out of the main pipeline and then enters the catalytic oxidation equipment 9 for catalytic oxidation treatment and tail gas discharge.

The upstream end of the bypass branch is communicated with the main pipeline, the communication position of the bypass branch and the main pipeline is positioned at the downstream side of the blower 4, and the downstream end of the bypass branch is communicated with an exhaust pipe of the catalytic oxidation device 9; and a bypass valve 5 is arranged on the bypass branch, and the bypass valve 5 and the main pipeline valve 6 are controlled to be opened or closed according to the numerical value fed back by the combustible gas detector 3.

When the combustible gas detector 3 detects that the concentration of the combustible gas exceeds the limit value, the main pipeline valve 6 is closed, and the bypass valve 5 is opened to ensure the safety of the system.

A fire retardant component is also arranged on the main pipeline and is positioned at the upstream side of the catalytic oxidation equipment 9. Preferably, the flame retardant assembly comprises at least a flame retardant 7, the flame retardant 7 being disposed between the main conduit and the catalytic oxidation unit 9, and the VOCs gas passing through the flame retardant 7 and entering the catalytic oxidation unit.

Further, the back-fire relief subassembly still includes water-sealed tank 8, and water-sealed tank 8 sets up between spark arrester 7 and catalytic oxidation equipment 9, and the gaseous flow through of VOCs who flows out spark arrester 7 reentries catalytic oxidation equipment 9 behind the water-sealed tank 8.

The water-sealed tank 8 also plays a role of backfire prevention, and the flame arrester 7 in front of the water-sealed tank 8 plays a role of bidirectional flame retardance.

The catalytic oxidation device 9 is internally provided with a plate heat exchanger 91, an electric heater 92 and a catalyst 93, and the VOCs gas is preheated at the plate heat exchanger 91, heated at the electric heater 92, finally treated in the catalyst 93 and then discharged. Among them, the catalyst 93 may be a noble metal catalyst.

Gaseous VOCs by the absorbent absorption and discharge low concentration's VOCs gas of high concentration in the absorption tower subassembly, low concentration's VOCs gas gets into catalytic oxidation equipment 9 behind combustible gas detector 3, air-blower 4 and trunk line valve 6, spark arrester 7, water-sealed jar 8. VOCs gas firstly enters a plate heat exchanger 91 to be preheated, the preheated VOCs gas passes through an electric heater 92, the temperature can reach 280-320 ℃, the VOCs gas directly enters a catalyst 93, tail gas is subjected to complete thermal decomposition under the action of the catalyst to produce harmless gas, and the main components of the gas are carbon dioxide and water; with the release of heat of reaction.

The purified gas after the reaction flows into the plate heat exchanger for heat exchange 91, the purified gas flow is preheated in the plate heat exchanger 91 for VOCs gas with low concentration, and the purified gas flow flows through the exhaust pipeline after being cooled and is discharged to the atmosphere after reaching the standard through a chimney.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An ultralow emission's VOCs processing apparatus which characterized in that: the device comprises an absorption tower set, VOCs gas flows out of the absorption tower set and then enters a main pipeline, a combustible gas detector, an air blower and a main pipeline valve are sequentially arranged on the main pipeline, and the VOCs gas flows out of the main pipeline and then enters catalytic oxidation equipment for catalytic oxidation treatment and tail gas discharge; the upstream end of the bypass branch is communicated with the main pipeline, the communication position of the bypass branch and the main pipeline is positioned at the downstream side of the blower, and the downstream end of the bypass branch is communicated with an exhaust pipe of the catalytic oxidation equipment; and a bypass valve is arranged on the bypass branch, and the bypass valve and the main pipeline valve are controlled to be opened or closed according to a numerical value fed back by the combustible gas detector.

2. An apparatus for treating ultra-low emission VOCs as recited in claim 1, wherein: the absorption tower set at least comprises a first-stage absorption tower and a second-stage absorption tower, the first-stage absorption tower and the second-stage absorption tower are arranged in series, and VOCs gas flows through the first-stage absorption tower and the second-stage absorption tower in sequence.

3. An apparatus for treating ultra-low emission VOCs as recited in claim 1, wherein: still be equipped with the back-fire relief subassembly on the trunk line, the back-fire relief subassembly is located catalytic oxidation equipment's upstream side.

4. An apparatus for treating ultra-low emission VOCs as recited in claim 3, wherein: the back-fire relief subassembly includes the spark arrester at least, the spark arrester sets up the trunk line with between the catalytic oxidation equipment, the gaseous flow of VOCs gets into behind the spark arrester catalytic oxidation equipment.

5. An apparatus for treating ultra-low emission VOCs as recited in claim 4, wherein: still include the water seal jar, the water seal jar sets up the spark arrester with between the catalytic oxidation equipment, the outflow the gaseous stream of VOCs of spark arrester is through reentrant behind the water seal jar catalytic oxidation equipment.

6. An apparatus for treating ultra-low emission VOCs as recited in claim 1, wherein: the catalytic oxidation device is internally provided with a plate heat exchanger, an electric heater and a catalyst, VOCs gas is preheated at the plate heat exchanger and heated at the electric heater, and finally is treated in the catalyst and then discharged.

7. An apparatus for treating ultra-low emission VOCs as recited in claim 6, wherein: the exhaust gas discharged from the catalyst flows into the plate heat exchanger.