JPS61101233A - Combustion treatment apparatus - Google Patents

Abstract

PURPOSE:To treat exhaust gas containing an org. solvent at low cost by uniformizing a gas stream, by well mixing the heated exhaust gas containing the org. solvent with combustion gas in a combustion furnace and providing a buffle containing a Cr-compound so as to insert the same in said furnace. CONSTITUTION:The greater part of solvent-containing exhaust gas is heated while passed through a heat exchanger 5 by a blower 4 to be sent to a combustion furnace 6 and contacted and mixed with high temp. combustion gas to be introduced into a reaction furnace 7 where the solvent component is oxidized and removed under a stay time and temp. condition required for the oxidation of the solvent component in the exhaust gas. A buffle 8 comprising Cr- compound-containing refractory, which is provided with openings for uniformizing a gas flow speed, is inserted in the furnace to allow reaction to easily advance. The gas after reaction is exhausted out of the system from an exhaust port 9 while sensible heat thereof is recovered by a heat exchanger 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a combustion treatment apparatus for exhaust gas containing an organic solvent.

[Conventional technology]

From the perspective of air pollution, exhaust gas containing organic bath agents such as toluene is required to be quickly buried and discharged below the WL level. Generally, the treatment method is to collect it by adsorbing it on activated carbon, etc. However, in cases where the exhaust gas has a low degree of a and there is little merit in recovering it, combustion, in which the organic bath agent is oxidized by combustion, is adopted.

The combustion method is a method in which high-temperature gas produced by t-burning LPG in heavy oil or kerosene is mixed with exhaust gas containing a solvent, and a portion of the bath agent is completely oxidized and decomposed. In this case, if the reaction temperature is low, the oxidation of the solvent component will be insufficient and the regulation gold cannot be cleared. However, increasing the reaction temperature increases fuel consumption, which is undesirable. One method of promoting oxidation at a low reaction temperature is to use the entire catalyst, but this method has problems with catalyst poisoning and cost.
9. Not necessarily economical.

That is, the combustion method requires high temperatures in order to burn and decompose the bath agent components above the minimum ignition temperature. When the solvent components are dilute, more co-fuel is required to maintain high temperatures. In order to minimize the amount of auxiliary fuel consumed, the efficiency of preheating the exhaust gas containing bath agent components should be improved.
It is necessary to consider how to improve the mixing sound of combustion gas and bath agent components. In particular, from the point of view of energy conservation, combustion at low temperatures using catalysts has been widely put into practical use, but this method is limited in the types of bath additives that can be used due to the damage and performance deterioration of the catalyst, and the exhaust gas All heavy metal dust and mist inside must be thoroughly removed.

[Problem that the invention seeks to solve]

The present inventors solved the problem with the above conventional method? Nine points to solve,
In particular, we focused on processing equipment using the combustion method, developed a combustion furnace with improved performance and low cost, and arrived at the present invention.

[Means for solving problems]

The present invention relates to a heat exchanger that raises the temperature of exhaust gas containing an organic bath agent, a combustion furnace that brings the heated exhaust gas into contact with high-temperature combustion gas and mixes it, and a reaction system that completely oxidizes and removes organic solvent components in the exhaust gas. In the combustion treatment equipment called Furnace Eri, a panfur material containing all the chromium compound and provided with an opening to make the gas flow rate uniform in the reactor. Regarding the equipment.

That is, in the present invention, the combustion gas and the exhaust gas containing the bottom part of the No. 1 solvent are mixed in the furnace, and at the same time, the entire acid fraction of the solvent can be achieved at a low temperature. It is assumed that the insertion baffle has a full role V'ffc, also known as tr#.

[For production]

The apparatus of the present invention will be explained below based on the drawings.

Fig. g1 is a typical diagram of the combustion processing apparatus according to the present invention. Fuel passes from a fuel tank 1 through a fuel pump 2 and is burned in a burner 3. On the other hand, exhaust gas containing bath additives (hereinafter referred to as
The exhaust gas (abbreviated as "exhaust gas") is passed through the blower 4 (9), the majority of which passes through the heat exchanger (also boiler (1), etc.) 5 and is heated up, and is then heated to the combustion furnace 6.
sent to. Note that some exhaust gas is also used as secondary air. The heated exhaust gas is brought into contact with and mixed with high-temperature combustion gas in a burnishing furnace 6, and is led to a reaction furnace 7. child\
Under the residence time and temperature conditions required for oxidizing the bath agent components in the exhaust gas, the bath agent components are oxidized and removed to below the regulation value.

The gas after the reaction is recovered by the sensible total heat exchanger (or boiler) 5 and then discharged from the system through the outlet 9.

In the apparatus of the present invention, one or two baffles 8 made of a chromium compound refractory are inserted into the reactor 7 in order to facilitate the simultaneous reaction. An example of a baffle cross section is shown in FIG. The actual opening of the baffle is determined by taking into account the contact area with the processing gas and the rectification effect.

〔Effect of the invention〕

(1) Exhaust gas that has come into contact with fuel combustion gas (gas to be treated)
C. Highly efficient oxidation could not be expected with conventional methods because the temperature distribution was non-uniform. However, according to the present invention, by passing the entire chrome refractory baffle with appropriate openings, the combustion gas and the exhaust gas can be mixed and have a uniform temperature distribution, thereby promoting oxidation.

(2) In the process of passing through a chromium refractory having an appropriate opening, it comes into contact with the chromium oxide surface of the refractory, and its catalytic action can promote the total oxidation of the organic bath agent.

Below, the effect of installing a baffle made of chrome refractory F in the apparatus of the present invention will be shown in Examples.

In the following examples, toluene, which is relatively difficult to process, was used as a solvent component.

Comparative Example 1 (Without baffle) At appropriate reaction temperature and residence time, the oxidation rate of toluene was 60%.

Comparative Example 2 (When one baffle made of quartz stone was inserted into the furnace) When the reaction time and residence time were the same as in Comparative Example 1, the oxidation rate of toluene was 68%.

Example 1 (When one baffle made of chromium refractory was inserted into the furnace) When the reaction time and residence time were the same as in Comparative Example 1, the oxidation rate of toluene was 80%.

Example 2 (Made of chrome refractory and inserted into a baffle't-2F) When the reaction time and residence time are the same as in Comparative Example 1, 100%
Example 5 (Example 1) 9i1! When one baffle made of a chromium refractory with a high chromium chloride content is inserted into the furnace.Toluene conversion under the same conditions as Example 1 The removal rate is 90
6th in %.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the combustion processing apparatus of the present invention. Second
The figure shows an example of a cross section of a baffle according to the device of the present invention. Sub-agent 1) Meifu agent Ryo Hagiwara - 2nd drawing, continuation amendment February 7, 1985

Claims (1)

[Claims] Combustion consisting of a heat exchanger that raises the temperature of exhaust gas containing organic solvents, a combustion furnace that contacts and mixes the heated exhaust gas with high-temperature combustion gas, and a reactor that oxidizes and removes organic solvent components in the exhaust gas. A combustion processing apparatus characterized in that a baffle material containing a chromium compound and provided with an opening for uniforming the gas flow rate in the reactor is provided in the reactor.