CN219588962U

CN219588962U - Single-tower electric RTO device with thermal bypass

Info

Publication number: CN219588962U
Application number: CN202320424660.7U
Authority: CN
Inventors: 王诗顺
Original assignee: Durr Painting Systems Engineering (shanghai) Co ltd
Current assignee: Durr Painting Systems Engineering (shanghai) Co ltd
Priority date: 2023-03-08
Filing date: 2023-03-08
Publication date: 2023-08-25
Anticipated expiration: 2033-03-08

Abstract

The utility model discloses a single-tower electric RTO device with a thermal bypass. The device comprises: the device comprises a horizontal box body, a lower air inlet bellows, a ceramic heat accumulator, ceramic tiles with special structures, an electric heating element, a heat bypass pipe, a regulating valve and an upper air inlet bellows. The utility model eliminates the heat exchanger buried in the heat accumulator, and effectively solves the problems of corrosion or abrasion risk of the heat exchanger and difficult field maintenance of the heat exchanger. Through setting up special structure's ceramic tile in the heat accumulator, draw forth unnecessary heat to the heat by-pass pipe from special structure's ceramic tile to through the flow of the governing valve adjustment hot flue gas on the heat by-pass pipe, can directly close the governing valve on the heat by-pass pipe completely under the standby mode, effectively solved the unnecessary heat loss problem under the RTO standby mode.

Description

Single-tower electric RTO device with thermal bypass

Technical Field

The utility model relates to the technical field of heat storage combustion devices, in particular to a single-tower electric RTO device with a thermal bypass.

Background

RTO is an organic waste gas treatment device with high-efficiency purification, and is totally called as RTO regenerative thermal oxidation furnace device. RTO is a device that combines chinese and western technology. Compared with the traditional catalytic combustion and direct combustion TO furnace, the TO furnace has the characteristics of high heat efficiency (more than or equal TO 95%), low operation cost, capability of treating high-concentration waste gas in large air quantity, and the like, and can also perform secondary waste heat recovery when the concentration is slightly high, so that the production operation cost is greatly reduced.

In the prior art, patent document CN 101435338A discloses a method and a device for destroying methane in low-concentration gas in coal mine, which destroy methane by adopting a heat-accumulating flameless combustion mode, and the direction switching is completed through a switching valve, so that the method and the device are mainly applied to the process engineering or similar engineering for destroying methane in low-concentration gas in coal mine, and the process is as follows:

A. the oxidation bed is electrified and is started to be heated to more than 800 ℃ through electric heating;

B. inputting coal mine low-concentration gas methane into an oxidation bed, and enabling the methane and oxygen to react rapidly and release heat;

C. storing the heat to maintain the continuous reaction;

D. discharging the reacted clean waste gas out of the oxidation bed;

E. switching the direction, and then inputting the coal mine low-concentration methane gas into an oxidation bed to perform oxidation reaction and release heat;

F. the heat exchanger buried in the heat accumulator is used for outputting redundant reaction heat;

G. repeating the steps B, C, D, E and F.

The prior art disclosed in the patent outputs redundant heat through a heat exchanger buried in a heat accumulator, the heat exchanger is buried in the middle of the heat accumulator for a long time, and has high corrosion or abrasion risk, and the heat accumulator needs to be removed firstly during regular maintenance, so that the heat accumulator is very inconvenient. Because the heat exchanger is buried in the heat accumulator all the time, in the standby mode of the RTO, in order to avoid damage of the heat exchanger, the heat exchanger needs to maintain a minimum flow rate, and part of heat in the heat accumulator is taken away by the heat exchange medium, so that unnecessary heat loss is caused. The heat recovery system with the on-site patented technology is suitable for the working condition that the VOC concentration of the waste gas is relatively stable, such as coal mine low-concentration methane which is claimed by the patent owner, the working condition that the VOC concentration has large fluctuation, or the production of customers is discontinuous, for example, the production period of 8 hours/day and 5 days/week, and the heat recovery system in the form of a heat exchanger has poor applicability. In addition, the prior art disclosed in the patent outputs redundant heat through a heat exchanger buried in a heat accumulator, and the temperature of water or steam correspondingly fluctuates greatly along with the switching of the flowing direction of clean air.

Disclosure of Invention

The embodiment of the utility model provides a single-tower electric RTO device with a thermal bypass, which is used for solving the problems of corrosion or abrasion of a heat exchanger and inconvenient maintenance, and avoiding the problem of unnecessary heat loss caused by the damage of the heat exchanger in a standby mode of the heat exchanger.

The embodiment of the utility model provides a single-tower electric RTO device with a thermal bypass, which comprises:

the horizontal box body is provided with an exhaust gas inlet channel and a clean gas outlet channel on one side;

the ceramic heat accumulator is arranged in the horizontal box body and is used for heat storage and heat exchange; the ceramic heat accumulator and the bottom surface of the horizontal box body are arranged at intervals to form a lower air inlet air box, and the ceramic heat accumulator and the top surface of the horizontal box body are arranged at intervals to form an upper air inlet air box; the lower air inlet bellows and the upper air inlet bellows are used for static pressure, steady flow and distribution of gas;

an electric heating element disposed within the ceramic thermal mass, capable of heating the ceramic thermal mass;

the ceramic bricks are arranged in the ceramic heat accumulator, so that the air flow in the ceramic heat accumulator is uniformly distributed and extends to the outer side of the horizontal box body to form a heat bypass air flow channel;

a heat bypass pipe which is arranged outside the horizontal box body and communicated with a heat bypass airflow channel formed by the ceramic bricks and is used for outputting reaction heat of oxidation reaction for generating volatile organic compounds;

the regulating valve is arranged on the heat bypass pipe and can regulate the flow of hot smoke in the heat bypass pipe.

Further, the exhaust gas inlet channel and the clean gas outlet channel are arranged on the same side of the horizontal box body side by side.

Further, the single tower electric RTO device with thermal bypass further comprises:

a first switching valve connected to the exhaust gas intake passage;

and the first cylinder is connected to the first switching valve and used for controlling the first switching valve.

the second switching valve is connected to the clean gas outlet channel;

and a second cylinder connected to the second switching valve for controlling the second switching valve.

Further, the ceramic heat accumulator is horizontally arranged in the horizontal box body, and the electric heating element is horizontally arranged in the ceramic heat accumulator.

Further, the ceramic heat accumulator is divided into a plurality of reaction units along the extending direction of the ceramic heat accumulator, and a thermal bypass airflow channel extends from the ceramic brick corresponding to each reaction unit; the heat bypass pipe is arranged parallel to the extending direction of the ceramic heat accumulator and is communicated with all the heat bypass airflow channels.

and the thermocouple extends into the ceramic heat accumulator and is used for measuring the temperature of the central layer of the ceramic heat accumulator.

Further, the thermocouple is arranged at the top of the horizontal box body and extends into the horizontal box body.

and a heat storage device connected to the heat bypass pipe and located at an outlet side of the regulating valve.

Further, the heat storage device includes:

the two ends of the heat storage device shell are respectively provided with an air inlet and an air outlet;

the ceramic heat storage brick is arranged inside the heat storage device shell and is positioned between the air inlet and the air outlet;

and the heat accumulating brick support grid is arranged on one side of the ceramic heat accumulating brick and is positioned on one side adjacent to the air inlet.

The single-tower electric RTO device with the thermal bypass provided by the embodiment of the utility model has the advantages that no metal heat exchange element is buried in the heat accumulator, no corrosion or abrasion risk exists, the heat accumulator is not required to be removed for regular maintenance, the flow of hot flue gas can be quickly regulated by the thermal bypass regulating valve under the working condition that the VOC concentration has larger fluctuation, the system is ensured to be always stable in a self-sustaining combustion state, and when the waste gas concentration at an RTO inlet is lower than the concentration of RTO self-sustaining combustion operation, the thermal bypass regulating valve is completely closed, so that the electric RTO is ensured to operate under the minimum electricity consumption. The corrosion or abrasion of the heat exchanger is reduced, and the problem of inconvenient maintenance is avoided.

In the embodiment, the heat exchanger buried in the heat accumulator is omitted, so that the problems of corrosion or abrasion risk of the heat exchanger and difficult field maintenance of the heat exchanger are effectively solved. Through setting up special structure's ceramic tile in the heat accumulator, draw forth unnecessary heat to the heat by-pass pipe from special structure's ceramic tile to through the flow of the governing valve adjustment hot flue gas on the heat by-pass pipe, can directly close the governing valve on the heat by-pass pipe completely under the standby mode, effectively solved the unnecessary heat loss problem under the RTO standby mode. Through setting up special structure's ceramic tile in the heat accumulator, draw forth the unnecessary heat to the heat by-pass pipe from special structure's ceramic tile, according to VOC's concentration, through the governing valve on the heat by-pass pipe quick adjustment hot flue gas's flow.

Drawings

The technical solution and other advantageous effects of the present utility model will be made apparent by the following detailed description of the specific embodiments of the present utility model with reference to the accompanying drawings.

FIG. 1 is a side view of a single tower electric RTO apparatus with thermal bypass provided by an embodiment of the present utility model.

FIG. 2 is a top view of a single tower electric RTO apparatus with thermal bypass according to an embodiment of the present utility model.

Fig. 3 is a schematic view illustrating the effect of the heat storage device according to the embodiment of the present utility model.

Fig. 4 is a schematic structural diagram of a heat storage device according to an embodiment of the present utility model.

Description of the embodiments

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

Specifically, referring to fig. 1 to 4, an embodiment of the present utility model provides a single-tower electric RTO device with thermal bypass, where the single-tower electric RTO device with thermal bypass includes: the horizontal box body, the lower air inlet bellows 5, the ceramic heat accumulator 6, the ceramic brick 7, the electric heating element 8, the heat bypass pipe 9, the regulating valve 10 and the upper air inlet bellows 13.

Wherein, one side of the horizontal box body is provided with an exhaust gas inlet channel and a clean gas outlet channel; the ceramic heat accumulator 6 is arranged in the horizontal box body and is used for heat storage and heat exchange; the ceramic heat accumulator 6 and the bottom surface of the horizontal box body are arranged at intervals to form a lower air inlet air box 5, and the ceramic heat accumulator 6 and the top surface of the horizontal box body are arranged at intervals to form an upper air inlet air box 13; the lower intake bellows 5 and the upper intake bellows 13 are used for static pressure, steady flow and distribution of gas; an electric heating element 8 is arranged in the ceramic heat accumulator 6 and can heat the ceramic heat accumulator 6; the ceramic bricks 7 are arranged in the ceramic heat accumulator 6 and are used for uniformly distributing the air flow in the ceramic heat accumulator 6 and extending to the outer side of the horizontal box body to form a heat bypass air flow channel; the heat bypass pipe 9 is arranged outside the horizontal box body and communicated with a heat bypass airflow channel formed by the ceramic bricks 7, and is used for outputting reaction heat of oxidation reaction for generating volatile organic compounds; the regulating valve 10 is arranged on the heat by-pass pipe 9, and can regulate the flow of hot flue gas in the heat by-pass pipe 9.

Further, the single tower electric RTO device with thermal bypass further comprises: a first switching valve 3 connected to the exhaust gas intake passage; a first cylinder 1 connected to the first switching valve 3 for controlling the first switching valve 3.

Further, the single tower electric RTO device with thermal bypass further comprises: a second switching valve 4 connected to the clean gas outlet channel; a second cylinder 2 connected to the second switching valve 4 for controlling the second switching valve 4.

Further, the ceramic heat accumulator 6 is horizontally arranged in the horizontal box body, and the electric heating element 8 is horizontally arranged in the ceramic heat accumulator 6.

Further, the ceramic heat accumulator 6 is divided into a plurality of reaction units along the extending direction, and a thermal bypass airflow channel extends from the ceramic tile 7 corresponding to each reaction unit; the heat bypass pipe 9 is disposed parallel to the extending direction of the ceramic heat storage body 6 and communicates with all the heat bypass airflow passages.

Further, the single tower electric RTO device with thermal bypass further comprises: a thermocouple 12 extending into the ceramic heat accumulator 6 for measuring the temperature of the central layer of the ceramic heat accumulator 6.

Further, the thermocouple 12 is disposed at the top of the horizontal housing and extends into the horizontal housing.

Further, the single tower electric RTO device with thermal bypass further comprises: a heat storage device 11 connected to the heat bypass pipe 9 and located on the outlet side of the regulator valve 10. The newly added heat storage device 11 can effectively solve the problem of temperature fluctuation of hot flue gas.

Further, the thermal storage device 11 includes: a thermal storage device housing 11-1, ceramic thermal storage bricks 11-2, and a thermal storage brick support grid 11-3. The two ends of the heat storage device shell 11-1 are respectively provided with an air inlet and an air outlet; the ceramic heat storage bricks 11-2 are arranged inside the heat storage device shell 11-1 and are positioned between the air inlet and the air outlet; the heat accumulating brick support grille 11-3 is provided on one side of the ceramic heat accumulating brick 11-2 and on the side adjacent to the air inlet.

Along with the switching of the vertical direction of the clean gas, the temperature of the hot flue gas in the heat bypass pipe 9 can generate larger fluctuation, specifically, see the effect diagram of the heat storage device 11 in fig. 3 and the schematic structural diagram of the heat storage device 11 in fig. 4, and as an option, the newly added heat storage device 11 can greatly improve the fluctuation of the temperature of the hot flue gas through the heat storage effect of the ceramic heat storage bricks 11-2.

The single-tower electric RTO (Regenerative Thermal Oxidizer, heat accumulating combustion device) belongs to a heat accumulating flameless combustion device (Flameless Regenerative Thermal Oxidizer, FRTO), is mainly used for replacing the traditional fuel RTO, and is used on the project site without the traditional fuel. When the concentration of the exhaust gas at the RTO inlet exceeds the concentration of the RTO self-sustaining combustion operation, the surplus heat can be led out through the heat by-pass pipe 9 for other industrial purposes such as high-temperature desorption of zeolite wheels, exhaust gas preheating, hot water heating and the like. The single tower electric RTO can operate in standby mode with very low power consumption.

In the standby mode (also called thermal insulation mode), the first switching valve 3 and the second switching valve 4 move downwards at the same time, the valve plate and the valve seat are in a closed state, the regulating valve 10 is completely closed, at the moment, the single-tower electric RTO forms a completely closed cavity, and the excellent internal thermal insulation design and the excellent thermal insulation performance of the ceramic thermal accumulator 6 are matched, so that the RTO is ensured to operate in the standby mode with extremely small heat loss.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

The foregoing has described in detail a single-tower electric RTO device with thermal bypass provided by the embodiments of the present utility model, and specific examples have been applied herein to illustrate the principles and embodiments of the present utility model, where the foregoing examples are only for aiding in understanding the technical solution of the present utility model and the core idea thereof; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims

1. A single tower electric RTO device with thermal bypass, comprising:

the ceramic heat accumulator is arranged in the horizontal box body; the ceramic heat accumulator and the bottom surface of the horizontal box body are arranged at intervals to form a lower air inlet air box, and the ceramic heat accumulator and the top surface of the horizontal box body are arranged at intervals to form an upper air inlet air box;

a heat bypass pipe arranged outside the horizontal box body and communicated with a heat bypass airflow channel formed by the ceramic bricks;

2. The thermally bypassed single tower electric RTO device of claim 1, wherein the exhaust gas inlet channel and the clean gas outlet channel are disposed side-by-side on a same side of the horizontal tank.

3. The thermally bypassed single tower electric RTO device of claim 2, further comprising:

a first switching valve connected to the exhaust gas intake passage;

4. The thermally bypassed single tower electric RTO device of claim 2, further comprising:

the second switching valve is connected to the clean gas outlet channel;

5. The single tower electric RTO device with thermal bypass of claim 1, wherein the ceramic thermal mass is disposed horizontally within the horizontal housing and the electric heating element is disposed horizontally within the ceramic thermal mass.

6. The single tower electric RTO device with thermal bypass of claim 1, wherein the ceramic thermal mass is divided into a plurality of reaction units along the extension direction of the ceramic thermal mass, and each reaction unit has a corresponding ceramic tile extending out of a thermal bypass airflow channel; the heat bypass pipe is arranged parallel to the extending direction of the ceramic heat accumulator and is communicated with all the heat bypass airflow channels.

7. The thermally bypassed single tower electric RTO device of claim 1, further comprising:

8. The thermally bypassed single tower electric RTO device of claim 7, wherein the thermocouple is disposed at a top of the horizontal tank and extends into the horizontal tank.

9. The thermally bypassed single tower electric RTO device of claim 1, further comprising:

10. The thermally bypassed single tower electrical RTO device of claim 9, wherein the thermal storage device comprises: