CN101963359A - Energy-saving device of incineration treatment system for volatile organic compounds containing nitrogen or/and sulfur - Google Patents

Abstract

An energy-saving device of a nitrogen or/and sulfur-containing volatile organic compound incineration treatment system comprises: an incinerator connected with a gas-guiding pipe and an exhaust pipe; a repurification unit arranged at the downstream of the exhaust pipe of the incinerator, repurifies the derived pollutant incinerated and burned by the incinerator, and discharges the purified air flow to the atmosphere through the exhaust pipe; a heat exchanger, which makes the air-bleed pipe recover the heat energy from the exhaust pipe. The invention has the effect of saving energy by additionally arranging the heat exchanger, and can improve the re-purification efficiency and the thermal drying desorption purification effect.

Description

Energy-saving device for nitrogen-containing and/or sulfur-containing volatile organic compounds incineration treatment system

technical field

The invention relates to an energy-saving device for an incineration treatment system for volatile organic compounds containing nitrogen or/and sulfur.

Background technique

Organic solvents widely used in life and production are easy to volatilize into gases at room temperature, so they are also called Volatile Organic Compounds (VOCs), and most VOCs are toxic to the human body and must be treated; Quality monitoring data show that ozone produced by the reaction of odor precursors such as VOCs and NOx with light has replaced suspended particles as the main pollutant affecting the Air Pollution Index (PSI). Therefore, strengthening the control of VOCs emissions is the current air pollution One of the key points of prevention and control; however, using an incinerator to incinerate is one of the VOCs waste gas treatment methods. Under appropriate conditions, the VOCs removal rate can reach more than 99%, and the products after combustion are usually water, carbon dioxide, nitrogen oxides, and sulfur oxides. Therefore, it is a method that can effectively treat VOCs and odor contained in exhaust gas.

Secondly, if an incinerator is used to incinerate nitrogen-containing or/and sulfur-containing volatile organic compounds (such as listed in the table below), it must be shown in Figure 1, and a denitrification or/and The desulfurization re-purification unit 20 is used to re-purify the derived pollutants (nitrogen oxides (NOx) or/and sulfur oxides (SOx)) after incineration and combustion before being discharged into the atmosphere; however, due to denitrification or/and The repurification unit 20 for desulfurization has a minimum temperature limit, which generally must be above 200°C (preferably between 300°C and 400°C) to obtain better purification efficiency, especially if the derived pollutant is sulfur For oxides (SOx), there is another problem of acid corrosion dew point that must be paid attention to; and the re-purification technology of this derived pollutant is a well-known and public technology, so it will not be described in detail here; however, the airflow flowing through the re-purification unit 20, Usually the temperature of the outlet airflow of the incinerator 10 is controlled above the required working temperature (as mentioned above 200°C) of the repurification unit 20 to achieve the effect of repurification; It is still very high (maybe between 200°C and 400°C), and it can be fully recycled by heat.

Furthermore, in order to prevent volatile organic compounds with high boiling point from remaining on the inlet side of the incinerator, which may cause smoldering or tar formation during shutdown, general incinerators (especially regenerative incinerators) need to regularly upgrade the incinerator The temperature of the airflow is used for high-temperature baking mode (Bake out process), and the residual high-boiling volatile organic compounds are heated and desorbed.

Contents of the invention

The main technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art, and provide an energy-saving device for an incineration treatment system for volatile organic compounds containing nitrogen or/and sulfur, which has the function of adding a heat exchanger to save energy Efficacy, and can improve the performance of repurification and the effect of heat drying desorption purification.

The technical solution adopted by the present invention to solve its technical problems is:

An energy-saving device for an incineration treatment system for volatile organic compounds containing nitrogen or/and sulfur, which is characterized in that it includes: an incinerator connected with an air induction pipe and an exhaust pipe; Downstream of the air pipe, the derivative pollutants after being incinerated and burned by the incinerator are repurified, and the purified airflow is discharged to the atmosphere through the discharge pipe; a heat exchanger enables the air induction pipe to recover heat energy from the discharge pipe.

The aforementioned energy-saving device for the incineration treatment system of volatile organic compounds containing nitrogen and/or sulfur, wherein the incinerator is a recovery type incinerator, a regenerative incinerator or a rotary regenerative incinerator.

The aforementioned energy-saving device for the incineration treatment system of nitrogen-containing and/or sulfur-containing volatile organic compounds, wherein the incinerator installs a fan in the air induction pipe or exhaust pipe.

The aforementioned energy-saving device for the incineration treatment system of volatile organic compounds containing nitrogen and/or sulfur, wherein the heat exchanger is a shell-and-tube or plate heat exchanger.

The aforementioned energy-saving device for the incineration treatment system of nitrogen-containing and/or sulfur-containing volatile organic compounds, wherein the repurification unit is one or a combination of denitrification and/or desulfurization equipment.

The aforementioned energy-saving device for the incineration treatment system of volatile organic compounds containing nitrogen and/or sulfur, wherein the induction pipe or the discharge pipe is selected to avoid the bypass pipe of the heat exchanger, and the first thermometer and the second thermometer are arranged At the inlet and outlet of the incinerator, the opening degree of the bypass pipe control valve is adjusted through a controller by means of the detected temperature signal.

The beneficial effect of the present invention is that it has the effect of adding a heat exchanger to save energy, and can improve the repurification efficiency and the effect of thermal drying, desorption and purification.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a structural schematic diagram of an existing incineration system for volatile organic compounds containing nitrogen or/and sulfur.

Fig. 2 is a structural schematic diagram of the present invention.

Explanation of symbols in the figure:

10 incinerators

11 fans

12 bleed pipe

121 Bypass pipe

122 control valve

13 exhaust pipe

20 repurification unit

21 discharge pipe

211 bypass pipe

212 control valve

22 chimney

30 heat exchanger

31 first thermometer

32 second thermometer

33 controller

Detailed ways

At first, referring to shown in Fig. 2, the present invention includes:

An incinerator 10 is connected with an air induction pipe 12 and an exhaust pipe 13, and a fan 11 is arranged on the air induction pipe 12 or the exhaust pipe 13 to introduce and incinerate volatile organic compounds; and the incinerator 10 is a Recuperative Thermal Oxidizer, a Regenerative Thermal Oxidizer or a Rotary Thermal Oxidizer;

A purification unit 20 is arranged downstream of the exhaust pipe 13 of the incinerator 10, and is used for repurifying the derivative pollutants (nitrogen oxides or/and sulfur oxides) after incineration and combustion of the incinerator 10, and The purified gas flow is discharged to the atmosphere through the discharge pipe 21 and the chimney 22, and the repurification unit 20 is one or a combination of denitrification and/or desulfurization equipment;

A heat exchanger 30 can be a shell-and-tube heat exchanger or a plate heat exchanger, so that the air induction pipe 12 recovers heat energy from the discharge pipe 21 .

In addition, the air induction pipe 12 or the discharge pipe 21 is alternatively arranged to avoid the bypass pipe (121 or 211) of the heat exchanger 30, so as to control the flow of air flowing through the bypass pipe (121 or 211), Adjusting the air flow rate entering the heat exchanger 30 for heat recovery, to adjust the temperature of the exhaust gas flow introduced into the incinerator 10, that is, to further limit the temperature of the inlet and outlet of the incinerator 10; therefore, the first The thermometer 31 and the second thermometer 32 detect the inlet and outlet temperatures of the incinerator 10 at the inlet and outlet of the incinerator 10, and use the temperature signal to adjust the temperature of the bypass pipe (121 or 211) through a controller 33. Control the opening of the valve (122 or 212) to adjust the flow of air entering the heat exchanger 30 for heat recovery, and then control the outlet temperature of the incinerator 10 between 300°C and 400°C.

Based on the above-mentioned structure, the heat exchanger 30 added by the present invention compared with the prior art is to discharge the purified air stream purified by the re-purification unit 20 to the atmosphere after heat recovery; however, according to actual test results, it can be After adding the heat exchanger 30, the final discharge temperature of the purified gas flow is reduced from the original 350°C to 170°C, and the temperature of the exhaust gas flow introduced into the incinerator 10 is raised from the original 50°C to 230°C, and then Save the fuel (energy) consumed by the incinerator 10, which has the effect of saving energy; and can further control the high and low values of the inlet and outlet temperatures of the incinerator 10, thereby improving the repurification performance of the repurification unit 20 and preventing incineration The residual problem of high-boiling volatile organic compounds on the inlet side of the furnace 10 has the effect of improving the re-purification performance and heat-drying desorption purification.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still belong to within the scope of the technical solutions of the present invention.

In summary, the present invention fully meets the needs of industrial development in terms of structural design, practicability and cost-effectiveness, and the disclosed structure also has an unprecedented innovative structure, novelty, creativity and practicability, and meets the requirements of relevant According to the requirements of the invention patent requirements, the application is filed according to law.

Claims (6)

1. An energy-saving device for a nitrogen-containing or/and sulfur-containing VOC incineration treatment system, characterized in that it comprises: An incinerator connected with an air induction pipe and an exhaust pipe; The re-purification unit is arranged downstream of the exhaust pipe of the incinerator, and performs re-purification treatment on the derivative pollutants after incineration and combustion of the incinerator, and discharges the purified airflow to the atmosphere through the discharge pipe; A heat exchanger enables the induction pipe to recover heat energy from the discharge pipe. 2. The energy-saving device for the incineration treatment system of nitrogen-containing and/or sulfur-containing volatile organic compounds according to claim 1, wherein the incinerator is a recovery type incinerator, a regenerative incinerator or a rotary storage type Hot incinerator. 3. The energy-saving device for the incineration treatment system of nitrogen-containing and/or sulfur-containing volatile organic compounds according to claim 2, characterized in that: the incinerator installs a fan in the air induction pipe or exhaust pipe. 4. The energy-saving device for the incineration treatment system of nitrogen-containing and/or sulfur-containing volatile organic compounds according to claim 3, wherein the heat exchanger is a shell-and-tube or plate heat exchanger. 5. The energy-saving device for the nitrogen-containing and/or sulfur-containing VOC incineration treatment system according to claim 4, wherein the repurification unit is one or a combination of denitrification and/or desulfurization equipment. 6. The energy-saving device for the nitrogen-containing and/or sulfur-containing volatile organic compound incineration treatment system according to any one of claims 1 to 5, characterized in that: the air induction pipe or the discharge pipe is set to avoid The bypass pipe of the heat exchanger is provided with a first thermometer and a second thermometer at the inlet and outlet of the incinerator, and the opening degree of the bypass pipe control valve is adjusted through a controller by means of the detected temperature signal.

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