Color-coating waste gas heat recovery method

A technology of waste gas heat recovery and color coating, which is applied to heating devices, drying gas layout, lighting and heating equipment, etc. Effect

Inactive Publication Date: 2008-04-16
HANGZHOU TAIXIN IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a color-coated waste gas heat recovery method, which mainly solves the problem in the prior art that the harmful gas containing organic solvents cannot be processed during waste gas heat recovery, and the air is easily polluted; the present invention It also solves the technical problems that the temperature required by the oven is high, the fresh air needs to be heated to the temperature required by the oven, energy is wasted, and the exhaust gas needs a lot of heat to be heated to the combustion temperature.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: A kind of color coating waste gas heat recovery method of this example, its steps are:

[0025] a. The exhaust gas from the oven passes through the heat exchanger of the machine, passes through the exhaust gas preheating chamber and the catalytic bed, and then passes into the heat exchanger of the machine; the exhaust gas exchanges heat with the catalyzed high-temperature gas and heats it to 300-400°C Catalytic light-off temperature;

[0026] b. The exhaust gas heated to the catalytic light-off temperature enters the catalytic bed for catalytic reaction, and the catalyst P t ,P d Under the action of oxidizing and converting harmful organic benzene into harmless water and carbon dioxide, the purpose of purifying waste gas is achieved. The waste gas contains organic benzene, and its main component is C 8 h 10 , the reaction formula is:

[0027]

[0028] c. After the catalyzed high-temperature gas is exchanged with the fresh air from the air filter...

Embodiment 2

[0030] Embodiment 2: A kind of color coating waste gas heat recovery method of this example, as shown in Figure 2, its steps are:

[0031] a. The exhaust gas from the oven passes through the heat exchanger of the machine, passes through the exhaust gas preheating chamber and the catalytic bed, and then passes into the heat exchanger of the machine; the exhaust gas exchanges heat with the catalyzed high-temperature gas and heats it to 300-400°C Catalytic light-off temperature; when the exhaust gas after heat exchange by the exhaust gas heat exchanger does not reach the design-controlled catalytic light-off temperature of 300-400°C, the burner uses light oil as fuel to heat up to the designed catalytic light-off temperature , the burner stops working when it is reached, and the system relies on the reaction heat of the exhaust gas to maintain the thermal balance of the system and achieve the best reactive power operation state;

[0032] b. The exhaust gas heated to the catalytic...

Embodiment 3

[0036] Embodiment 3: A kind of color coating waste gas heat recovery method of this example, as shown in Figure 2, its steps are:

[0037] a. The exhaust gas from the oven passes through the heat exchanger of the machine, passes through the exhaust gas preheating chamber and the catalytic bed, and then passes into the heat exchanger of the machine; the exhaust gas exchanges heat with the catalyzed high-temperature gas and heats it to 300-400°C Catalytic light-off temperature;

[0038]b. The exhaust gas heated to the catalytic light-off temperature enters the catalytic bed for catalytic reaction, and the catalyst P t ,P d Under the action of oxidizing and converting harmful organic benzene into harmless water and carbon dioxide, the purpose of purifying waste gas is achieved. The waste gas contains organic benzene, and its main component is C 8 h 10 , the reaction formula is:

[0039]

[0040] c. After the catalyzed high-temperature gas is exchanged with the fresh ai...

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Abstract

The invention relates to a method for heat reclaiming colorized painting exhaust gas and mainly solves the problem of air pollution caused by the prior art incapable of treating harmful gas with organic solvent when the colorized painting exhaust gas is heat reclaimed. The invention further solves the technical problems of higher temperature needed by an oven, the need of the additionally heating new wind up to the temperature needed by the oven and great waste of energy. The steps of the invention are as follows: the exhaust gas coming from the oven goes through a local heat interchanger and then is inlet into the local heat interchanger through an exhaust gas preheating chamber and a catalytic bed; the exhaust gas does heat exchange with high temperature catalyzed gas and is heated up to the catalyzing and initiation temperature; the exhaust gas heated up to the catalyzing and initiation temperature enters into the catalytic bed to do catalytic reaction; the high temperature gas after being catalyzed is inlet into a hot water heat interchanger for other devices through a new wind heat interchanger, doing heat exchange with the new wind from an air filter and a new wind blower; the new wind from the air filter and new wind blower is heated by the new wind heat interchanger and then conveyed to a circulated air system of oven.

Description

technical field [0001] The invention relates to a method for recycling waste gas, in particular to a heat recovery method for color-coated waste gas. Background technique [0002] The color coating production process needs to coat the coating material containing organic solvent on the strip, and the organic solvent will volatilize during the curing process of the coating material. If the organic solvent is not discharged and accumulates to a certain concentration, it will explode, and direct discharge will pollute the environment. The Chinese patent discloses a method for utilizing the heat energy of exhaust gas from enameled wire dipping oven (publication number: CN1967117A). The heat exchanger uses the heat energy of the exhaust gas in the exhaust pipe to heat the flowing cold air in the heat exchanger, and then guides the heated hot air in the heat exchanger to the enameled wire drying process through the pipe as the enameled wire drying process. Roasting heat can be us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B21/14F26B23/00
CPCY02P10/25Y02P70/10
Inventor 孙国根
Owner HANGZHOU TAIXIN IND
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