JPS6149981A - Method of recovering waste heat from drying furnace for hydro-extraction - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Object of the Invention [Field of Industrial Application] The present invention relates to a method of utilizing exhaust gas from a draining drying oven.

[Prior art] Not only draining drying ovens but also direct combustion type drying ovens require the intake of fresh air necessary for combustion, so it is necessary to exhaust some of the warm air inside the oven. Maintains supply and exhaust balance.

By the way, the high temperature of such drying oven HSR etc. gas is around 140-150°C, so there is a lot of loss of thermal energy if it is simply released. It was used to preheat the air.

However, even if the heat of the exhaust gas is recovered and utilized by a heat exchanger, the heat recovery rate is about 7.110%, which is still insufficient for the utilization of the exhaust gas.

On the other hand, air conditioners for the purpose of heating workplaces suck in outside air, heat it, and then send it to the air. It was heated with a heater.

[Problems to be solved by the invention] For this reason, in buildings that have drying ovens nearby, exhaust heat from the exhaust gas from the drying oven is wasted, while air conditioners use a large amount of fuel to supply outside air to a specified level. There was an absurdity in heating to a constant temperature.

Therefore, when we focus on draining drying ovens in particular, unlike paint drying ovens, their exhaust gas does not contain toxic solvents, and apart from the unburned gas immediately after combustion starts, the exhaust gases directly have a negative impact on the human body. I'm not even close.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for effectively recovering exhaust heat from 77 gas of a draining drying furnace from the point of view of energy saving.

■2 Structure of the invention [Is the problem a force? In order to achieve such an objective, the method for recovering exhaust heat from a draining rotary furnace of the present invention removes a portion of the exhaust gas from the draining drying oven that circulates through combustion and the furnace to outside the system. The exhaust gas is introduced into an air conditioner through an exhaust path and an inlet path communicating with the exhaust gas, and the outside air introduced into the air conditioner is preheated by the exhaust gas, thereby achieving energy saving requirements.

F Example An actual example of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a system configuration for implementing the method of the present invention. This system introduces a portion of relatively high-temperature, moisture-containing, and high-enthalpy exhaust gas that is aired for draining (from P1 to J) into the air conditioner 2 through introduction paths A+ and A2. By preheating the outside air introduced into the air conditioner AVll 2 with the exhaust gas, purifying the exhaust gas together with the preheated outside air, and heating it, it can be painted, for example, as clean air at a constant temperature and humidity suitable for heating the workplace. This is to supply air to the booth.

The draining drying oven 1 passes the exhaust gas through the burner 3, filter 4, and air supply fan 5 in this order through return paths B+ and B2.8.
3, B4, and B5. Needless to say, when circulating the exhaust gas, a certain amount of fresh air is taken in from outside the system. In this system,
The introduction path ΔT is connected to a midway portion of the return path 8+ and B2, so that a portion of the exhaust gas can be supplied to the air conditioner 2.

Further, when the burner 3 is ignited, unburned gas is generated due to pre-purging, and in order to discharge this gas to the outside of the system, an outside exhaust passage C1 is formed as a branch from the intermediate portion of the introduction passages A+ and A2.

If the unburned gas mentioned above is directly introduced into the air conditioner 2, it will pollute the atmospheric environment inside the building and become harmful to the human body. In order to prevent the combustion exhaust gas from escaping out of the system as much as possible, a damper is provided to regulate the flow path of the exhaust gas. That is, the first damper 6 is provided in the middle of the introduction path A1, the second damper 7 is provided in the middle of the introduction path A2, and the third damper 8 is provided in the middle of the external exhaust path C1. ing.

When introducing exhaust gas into one air conditioner 2, first open the first and third dampers 6.8 and open the second damper 7 to exhaust unburned gas out of the system. That m'j
41 and the second damper 6.7, and open the third damper 8 to introduce the exhaust gas into the air conditioner 2. Therefore, unburned gas is used for air conditioning! In addition, completely combusted exhaust gas can be introduced into the air conditioner 2 without being wastefully discharged outside the system.

The air conditioner 2 converts adult outdoor air to zero and adjusts it to a predetermined humidity level of 64°C to make the air suitable for the working environment before sending it into a building such as a painting booth. For example, as shown in FIG. 2, this type of air conditioner 2 includes an insect screen 11 stretched over the front intake port of a housing 10, a roll mat filter 12 that removes coarse dust, and a roll mat filter 12 that removes fine particles. At the same time, a capillary filter 13 and a shower 14 that humidify, an eliminator 15 that removes water droplets, an Erofin heater 16 that heats, and an air supply fan 171) that supplies clean air at a predetermined temperature and humidity inside the housing 10
14 have been completed.

The air conditioner 2 in this system is connected to the introduction path A2 before the roll mat filter 12. Therefore, when outside air is taken into this air conditioner 2, the exhaust gas in a high enthalpy state joins the adult outside air.
Under the circumstances, this outside air is preheated, resulting in a state in which it has a higher enthalpy fg, that is, a higher heat (2) than before inhalation.

The thus preheated adult outside air and exhaust gas are purified by passing through the roll mat filter 12 and the water shower 14, and water droplets are removed by passing through the eliminator 15. Next, it is heated to a predetermined humidity using the Erofin heater 16 (above).
Since the inhaled outside air has been preheated and has achieved a high enthalpy state, less energy is required to raise it to a predetermined temperature.

The outside air and exhaust gas, which have been raised to a predetermined temperature, are then sent into the building by the air sending fan 17 as warm air for heating.

The supplied warm air does not contain unburned gas or solvent, and will not worsen the atmosphere inside the building.vr
Since the exhaust gas introduced from the draining drying furnace 1 contains moisture, a humidification step within the drying device 2 can be made unnecessary.

Note that the above-mentioned embodiment is merely an example, and various modifications can be made within the scope of the gist of the present invention. For example, the introduction path Al,
A2 is the return path B+,...,B5 as shown in FIG.
It is also possible to create a separate system separate from the . Further, unburned gas may be exhausted to the outside of the system in the middle of the air supply system from the air conditioner.

■0 Invention Glue J As is clear from the above description, the present invention provides an external exhaust path and an inlet path leading to this for a part of the exhaust gas of the draining drying oven that circulates between the combustion chamber and the furnace. The exhaust gas is then introduced into the air conditioner, and the outside air introduced into the air conditioner is preheated by the exhaust gas, which has the effect of being able to recover the exhaust heat from the exhaust gas from the drying oven for energy saving purposes. It is something that you have.

[Brief explanation of the drawing]

FIG. 1 is a system configuration block diagram showing an example of implementing the method of the present invention, FIG. 2 is a schematic 31-dimensional diagram without showing an example of an air conditioner, and FIG. 3 is a system configuration block diagram showing an example of implementing the method of the present invention. It is a system configuration block diagram. 1...Drying oven for draining, 2...Air conditioner, △1.
A2...Inlet path, C1...Exhaust path outside the system.

Claims (1)

[Claims] A part of the exhaust gas from the draining drying furnace that circulates in the combustion chamber and the furnace is introduced into the air conditioner through an external exhaust path and an introduction path that communicates with this, and the outside air introduced into the air conditioner is preheated with the exhaust gas. A method for recovering exhaust heat from a draining drying oven, characterized by: