JPH09122446A - Gas heating and purifying apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a heat storage body part in the inside of a purifying part from becoming abnormally high temperature which produces in the case that the concentration of a harmful gas component is high in a heat storage type purifying apparatus to oxidize and purifying harmful gases, e.g. CO(carbon monoxide), HC(hydrocarbons) in various kinds of waste gases, by heating. SOLUTION: The claimed apparatus is an apparatus to purify a gas containing harmful gases by heating, has a structure in which both ends of a purifying part 7 are switched to be an inlet and an outlet of a gas in every prescribed period, and is provided with a heating apparatus 10 and heat storage body layers in the middle of respective routes from both ends to the heating apparatus 10. At least two routes in which a gas flows from one heat storage body layer to the other heat storage body layer and which are switched by dampers 14, 15 are also formed in the apparatus and an apparatus to radiate heat is installed in one of the flow routes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat purifying apparatus for heating and oxidizing malodorous and harmful components such as CO (carbon monoxide) and HC (hydrocarbons) mixed in various exhaust gases to oxidize them and purify them. is there.

[0002]

2. Description of the Related Art In recent years, it has become indispensable to purify and discharge CO and HC components generated in various combustors, drying and heat treatment due to their harmfulness and odor. CO
As a method for purifying the exhaust gas and HC components, a method in which the exhaust gas itself is heated and reacted with oxygen in the gas has the highest purification efficiency and high reliability. Here, the temperature of the exhaust gas is raised and the oxygen in the air is C
To react with O or HC, a temperature of 800 to 900 ° C. or higher is required. 200 to 40 in the method using an oxidation catalyst
The reaction can proceed in the temperature range of 0 ° C. and waste of thermal energy can be eliminated.

A conventional gas purification device will be described below. 3A and 3B show an example of a conventional catalyst purifying apparatus, where FIG. 3A shows the main body of the catalyst purifying apparatus, and FIG. 3B shows the system including heat exchange. Reference numeral 25 is a catalyst purifying device main body, 27 is a heat exchanger, 22 is a heating device, and 23 is a catalyst. In (a), the exhaust gas is introduced into the heating device from 20, heated to a predetermined temperature by the heating device 22 and CO, HC and the like are oxidized and purified by the catalyst 23, and discharged from 24. At this time, the energy required to raise the temperature of the exhaust gas is discharged together with the gas. A system using a heat exchanger for the purpose of recovering a part of this energy is (b). In this case, the exhaust gas is introduced from 26, is heated in the heat exchanger 27, and proceeds along the arrow 21 to the main body of the catalyst purifying apparatus in the flow 25. The gas purified here enters the heat exchanger 27 again, is cooled, and is discharged from 28. That is, it is an object to reduce energy loss by recovering a part of the energy required for raising the temperature of exhaust gas.

On the other hand, FIG. 4 shows an example of a heating and purifying apparatus using a heat storage body, in which the state of (a) and the state of (b) are alternately repeated to reduce heat energy. 6
Is a heat storage body, and 10 is a heating device. Reference numerals 14 and 15 denote dampers for reversing the flow of exhaust gas containing harmful components in the purification section 7. In (a), the exhaust gas proceeds as indicated by arrows 1 to 3 and enters the purification portion 7 from 13. The heat storage body 6 passes through the lower part of the heat storage body 6 and is heated and purified by the heating device 10
The heat is taken away from the upper part of the cooling system, cooled, and exits the purification part from 12 and is discharged from 11. After a certain period of time, the dampers 14 and 15 are operated so as to change the flow direction of the exhaust gas as in (b). That is, the upper part of the heat storage body 6, which has taken away heat from the exhaust gas in (a), works to give heat to the exhaust gas this time, and supplements a part or most of the energy for heating the exhaust gas. That is, heat is confined in this purifying device to save energy.

FIG. 5 shows a slide damper 4 in which the purifying portion of the heating and purifying apparatus using the heat storage body shown in FIG. 4 is bent in a U shape so that the gas outlets and inlets on both sides of the purifying portion are flat. The gas flow direction can be reversed with.

Thermal energy can be reduced by alternately repeating the states (a) and (b) and the states (c) and (d). 6 is a heat storage body, 10 is a heating device.

[0007]

However, FIG.
In the conventional example shown in FIG. 5, a purification device with high heat exchange efficiency can be realized, but when the concentration of harmful components HC and CO contained in the exhaust gas is high, it is accompanied by heating purification (oxidation purification). The heat generation energy of HC and CO is accumulated in the heat storage portion inside the purification portion due to the reversal of the gas flow, and becomes an abnormally high temperature. In the case of a system that uses a catalyst between the heat storage body and the heating device, abnormally high temperature causes deterioration of the catalyst performance, and high temperature exhaust gas will flow to the damper part and gas outlet for reversing the gas flow. It also caused a great deal of damage to himself.

The present invention solves the above-mentioned problems of the conventional example, and does not cause the heat storage body to have an abnormally high temperature even in the case of exhaust gas containing high-concentration HC components and CO that generate a large amount of heat. An object of the present invention is to provide a configuration and a control method of a heat purification device that can be used with peace of mind.

[0009]

In order to achieve this object, the gas heating and purifying apparatus of the present invention uses a heat storage body separate from a heat storage body separately from a gas flow path flowing from one heat storage body to another heat storage body through a heating device. The flow passage is provided in the heat storage body. Then, these flow paths can be switched, and a switching operation is performed by operating a damper or the like based on the information while detecting the temperature of the heat storage body or the heating portion, and the heat generation of the HC component or CO is large and the temperature of the heat storage body is large. When the rise is abnormal, the flow path is switched to another flow path, and a device such as a fin for heat dissipation is provided in this separate flow path.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A heating device inside a purifying portion is provided with a temperature sensor in the vicinity thereof, and heats it to a temperature necessary for purifying harmful gas components. For example, when a temperature of 300 ° C. is required to purify harmful components in an apparatus using a catalyst, heating is performed until the temperature sensor reaches 300 ° C., and if the temperature exceeds 300 ° C., heating is stopped. 300 again if the temperature drops
It is controlled to heat up to ℃. On the other hand, when the concentration of harmful gas components is high and the amount of energy (heat generation) during oxidative purification is large and the heat generation amount exceeds the heat radiation amount from the purification part, the temperature of the catalyst and heat storage body near and near the heating device Rises above 300 ° C. In a region where the amount of heat generated is relatively small, the amount of heat radiation increases as the temperature rises, so the temperature is balanced at a certain temperature. However, if the calorific value is large,
Raises to a temperature range that may cause catalyst deterioration and equipment trouble. Therefore, in consideration of the safety of the device, a predetermined temperature (for example, 400 ° C) is set, and when the temperature sensor detects that this temperature is exceeded, the flow path from one heat storage body to the other heat storage body is automatically set by a damper or the like. To switch to a device for heat dissipation or a devised flow path. Whether to completely switch the flow path or to flow a part of the gas to another flow path according to the heat generation amount of the harmful gas component is adjusted by the information of the temperature sensor.

[0011]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, another flow passage (32) is provided between the heat storage layers of the purifying device having the structure shown in FIG. 4 shown in the conventional example, and the flow passage switching damper (31) can change the gas flow. It is a thing. When the temperature of the heating part (10) or the heat storage layer (6) is low, the gas is in the state of (a) in FIG. 1 and the gas flowing between the heat storage layers passes through the heating part (10). When the temperature is detected by the temperature sensor (16) and this temperature is likely to rise to the extent that it may adversely affect the safety of the device or the heat storage body, the damper (31) is operated to change the gas flow between the heat storage bodies to the heat radiation fin ( 33) Switch to the flow path having.
For this switching, it is desirable to send information from the temperature sensor (31) to the damper control portion and automatically switch according to the temperature. The gas switched to the flow passage with the heat radiation fins is cooled by the heat radiation action of this flow passage portion. That is, it has an effect of releasing an excessive amount of heat generated from the harmful gas.

(Embodiment 2) FIG. 2 shows another flow path (32) provided between the heat storage layers of the purification apparatus having the structure shown in FIG. It can be changed. When the temperature of the heating portion (10) and the heat storage layer (6) is low, the gas flows between the heat storage layers in the states of (a) and (b) of FIG. 2 and passes over the flow path switching damper (31). I will do it. Temperature sensor (1
When the temperature is detected in 6) and it seems that the temperature rises so as to adversely affect the safety of the device and the heat storage body, the damper (3
Operate 1) to change the flow of gas between the heat storage bodies to the radiating fins (3
3) to pass through the channel (32). For this switching, it is desirable to send information from the temperature sensor (31) to the damper control portion and automatically switch according to the temperature. The gas passing through the flow passage with the radiation fins is cooled by the heat radiation action of this flow passage portion. That is, it has an effect of releasing an excessive amount of heat generated from the harmful gas. The damper (31) is of a rotary type and can exert a great effect with a simple structure.

[Brief description of the drawings]

FIG. 1 (a) is a diagram showing a gas heating and purifying device of the present invention. FIG. 1 (b) is a diagram showing a state in which gas flow paths are switched in the device.

FIG. 2A is a top view showing another gas heating and purifying apparatus of the present invention. FIG. 2B is a front view of the same. FIG. 2C is a top view showing a state in which the gas flow is reversed in the apparatus.

FIG. 3 (a) is a diagram showing a configuration of a conventional catalyst purification device main body, and (b) is a diagram showing a configuration of a conventional catalyst purification system including a heat exchanger.

FIG. 4 (a) is a diagram showing a configuration of a conventional gas heating / purifying device main body, and FIG. 4 (b) is a diagram showing a state in which the gas flow of the device is reversed.

FIG. 5 (a) is a top view showing a conventional gas heating and purifying device (b) is a front view thereof (c) is a top view showing a state in which the gas flow is reversed in the same device (d) is a front view thereof

[Explanation of symbols]

 6 heat storage layer 10 heating device 31 damper 16 temperature sensor 32 one of gas flow paths

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B01D 53/36 103Z

Claims (2)

[Claims] 1. An apparatus for purifying by heating exhaust gas, atmosphere, and indoor air, wherein both ends of the purifying portion have a structure in which the inlet and the outlet of the gas are alternately switched at regular intervals, and the purifying portion is heated. In a heating and purifying device that is equipped with a device and has a heat storage layer on each way from both ends of the purification portion to the heating device, there are two or more flow paths for the gas to flow from the one heat storage layer to the other heat storage layer. A gas heating and purifying apparatus for flowing gas through at least one flow path by switching the flow paths. 2. Two from one heat storage layer to the other heat storage layer
The gas heating and purifying apparatus according to claim 1, wherein a device for heat dissipation is installed in at least one of the one or more flow paths.