JPH02146462A - Automatic cleaning device of latent heat recovery device for hot water supply apparatus - Google Patents

Abstract

PURPOSE:To automatically and efficiently prevent a liquid path from being fouled, by a method wherein detergent is fed at regular intervals into the path that passes through a latent heat recovery device, and the water level in a hot water storage is monitored constantly to supply water automatically. CONSTITUTION:Pipes 13 and 9 that are connected to a latent heat recovery device 8 are likely to be fouled by mineral oil contained in the exhaust gas supplied to the latent heat recovery device 8. However, as detergent is fed from a detergent container 19 to the latent heat recovery device 8 through a valve 20 and a fed pipe 22 at specified intervals set by a timer 21, the exhaust gas comes into contact with the detergent, and the mineral oil is dissolved into waste liquid and discharged outside through valve 18. As a result, the exhaust gas is always cleaned, so that the fluid path in the latent heat recovery device 8 is not fouled by the exhaust gas.

Description

[Detailed Description of the Invention] [Field of Industrial Application] Recently, as one type of combined heat and power generation device, power generation is performed using the driving force of a gas engine, diesel engine, gas turbine, etc. (hereinafter referred to as the engine), and the exhaust gas thereof is utilized. Water heaters that produce high-temperature water have appeared.

The present invention relates to an automatic cleaning device for a latent heat recovery device used in the above-mentioned water heater using exhaust gas.

[Prior Art] The present applicant has developed a water heater that effectively utilizes exhaust gas.
For example, as shown in FIG. 2, a gas engine 1. AC generator 2. Cooling water heat exchanger 3. The patent application has been filed for a hot water supply system comprising a gas/liquid direct type latent heat recovery device (hereinafter referred to as a latent heat recovery device), a hot water heat exchanger 5, and a hot water supply pipe 7.

Incidentally, the latent heat recovery n5 is connected to a water supply pipe 9. which has a faucet 9a with a shower-shaped tip above it. It is provided with an exhaust pipe 10, a packed bed 11 in the substantially middle part directly below the water supply pipe 9, and a hot water storage part 12 and an exhaust gas supply pipe 13 in the bottom part. Also,
Exhaust gas is supplied to the exhaust gas supply pipe 13 from the exhaust pipe 1c of the gas engine 1, and the exhaust pipe 1c is formed into an exhaust manifold in which exhaust ports of, for example, four cylinders are combined into one supply port. It is preferable.

15 and 16 are hot water pumps, 17 and 18 respectively
are each a solenoid valve.

The primary side of the hot water heat exchanger 5 is the hot water storage section 1 of the latent heat recovery device.
Using the hot water supplied from 2 as a heat source, tap water (
20℃) etc. is converted into hot water (52℃), and the clean hot water is supplied to the heat exchanger 3.
Most of the hot water on the next side is recovered latent heat through the branch pipe 19.
5. Reused as supply water (this amount is 25℃ water)
Furthermore, highly acidic water and water produced in excess during heat conversion are drained from the pond branch pipe 20 via the solenoid valve 18. In this way, the supply water is circulated from the primary side of the hot water heat exchanger 5 to the latent heat recovery n5, so that the supply water (2) for the latent heat recovery n5 is only necessary at the beginning, and can be largely saved thereafter.

The gas engine 1 drives the alternating current generator 2 to generate electric power, and the high-calorie exhaust gas (500° C.) discharged from the engine 1 is supplied to the latent heat recovery n5.

In this state, when the supply water (tap water at 20°C) is supplied from the water supply pipe 9 to the latent heat recovery unit n5, the exhaust gas and water come into direct contact within the latent heat recovery unit, and the hot water storage unit 12 Hot water (52°C) is stored in the hot water pump 15, converted to clean hot water in the heat exchanger 5, and then reheated to 80°C in the heat exchanger 3 to be sent to the hot water pipe 6.
Hot water is supplied from

[Problems to be Solved by the Invention] By the way, in the above-mentioned prior application, in order to recover heat from the high-calorie exhaust gas generated by the gas engine 1, the exhaust gas is brought into direct contact with water to recover heat. In combination with a gas/liquid direct contact type latent heat recovery device (hereinafter referred to as the latent heat recovery device), the exhaust gas is improved so that the latent heat of vaporization can also be recovered, and the exhaust gas release temperature is almost atmospheric temperature. Although it is a water heater that uses gas, 1. In this case, the fluid circuit provided in the latent heat recovery device and its discharge section is contaminated by the mineral oil contained in the exhaust gas, so the disadvantage is that the efficiency of heat recovery decreases as this contamination increases. .

For this reason, operators regularly inspect and clean the areas contaminated by mineral oil, but maintenance and inspections are complicated, and there has been a desire to find a way to automatically and efficiently prevent contamination.

An object of the present invention is to provide an automatic cleaning device for a latent heat recovery device for a hot water supply device that solves these problems.

[Means for Solving the Problems] The present invention is combined with a gas/liquid direct contact type latent heat recovery device (hereinafter referred to as a latent heat recovery device) that recovers heat by bringing exhaust gas into direct contact with water, thereby recovering the latent heat of vaporization. In a hot water supply system using exhaust gas that can recover heat and is designed to improve the temperature at which the exhaust gas is released so that it is almost atmospheric temperature, detergent is added at regular intervals to the fluid circuit that passes through the latent heat recovery device. The present invention relates to an automatic cleaning device for a latent heat recovery device for a hot water supply device, which is configured to supply water, monitor the water level in a hot water storage section, and automatically supply water.

[Example] An embodiment of the present invention shown in FIG. 1 will be described below.

In the same figure, components equivalent to those in FIG. 2 are designated by the same reference numerals.

IQ is a detergent storage container containing non-polluting detergent, 20 is a solenoid valve, 21 is a timer that opens and closes this solenoid valve 20 at fixed time intervals, and 22 is a supply pipe that supplies detergent to latent heat recovery n5. be.

23 is a water supply pipe for supplying water to the hot water storage section 12, and 24 is a ball tap that detects the water level of the hot water storage section 12.

The water level in the hot water storage section 12 is monitored by the ball tap 24, and when the water level falls below a predetermined level, water is automatically supplied from the water supply pipe 23.

The detergent is a special detergent that can dissolve mineral oil, such as the all-purpose detergent "New Apollo" (trade name: manufactured by Affinity Kasei).

[Function] In the above configuration, the gas engine 1 drives the alternator 2 to generate electric power, and the high calorific exhaust gas (500°C) discharged from the engine 1 recovers 2% of latent heat.
8, and in this state, the supply water <20°C
When water (tap water) is supplied from the water supply pipe 9 to the latent heat recovery unit 5, the exhaust gas and water come into direct contact within the latent heat recovery unit, and hot water (52°C) is stored in the hot water storage unit 12 using the so-called latent heat recovery method. This is similar to the technology of the prior application in that the hot water is converted into clean hot water by the heat exchanger 5 via the hot water pump 15, and then reheated to 80°C in the heat exchanger 3 and then supplied from the hot water supply pipe 6. .

By the way, the pipe 1 connected to the latent heat recovery device 8 due to the mineral oil contained in the exhaust gas supplied to the latent heat recovery device n5
Magnitudes 3 and 9 are likely to be contaminated.

In the case of the present invention, detergent is supplied from the detergent storage container 19 to the latent heat recovery n5 via the valve 20 and the supply pipe 22 at predetermined time intervals determined by the settings from the timer 21. During the process of supplying the exhaust gas into the latent heat recovery device, the exhaust gas is brought into contact with a detergent, whereby mineral oil components in the exhaust gas are dissolved in the waste liquid and discharged to the outside via the valve 18.

Therefore, the exhaust gas is constantly cleaned and does not contaminate the fluid path for latent heat recovery n5.

Incidentally, the combustion generated water generated during the heat recovery process in latent heat recovery n5 increases, and the pH of latent heat recovery n5 decreases and tries to become acidic. Water is drained appropriately.

On the other hand, the ball tap 24 constantly monitors the water level in the hot water storage section 12, and when the water level is about to drop below a predetermined level, this is automatically detected and water is supplied from the water supply pipe 23. I have to.

[Effect of the invention] In the present invention, the latent heat recovery device is used as a gas/water heat exchanger for exhaust gas, and the hot water obtained by the latent heat recovery device is reheated by the cooling water heat exchanger via the heat exchanger. In a water heater designed to

This invention relates to an automatic cleaning device for a latent heat recovery device for a hot water supply system that effectively and appropriately cleans the latent heat recovery device, and has the following excellent effects.

■The fluid circuit that passes through the latent heat recovery device is constantly cleaned with detergent, so it is not contaminated with mineral oil in the exhaust gas and the efficiency of heat recovery does not decrease.

■For the above-mentioned cleaning, the supply of detergent is automatically performed at fixed time intervals using a timer.

It is efficient, maintenance personnel can be omitted, and it is economical.

■With a ball tap that monitors the water level in the hot water storage section and automatically supplies water when the water level drops below a certain level, the hot water storage section will not become sticky with detergent foam and the wash water will circulate through the latent heat recovery device. Good workability.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing one embodiment of the present invention. The system diagram shown in FIG. 1 is a system diagram showing a conventional example. 1: gas engine 2: alternator 3: cooling water heat exchanger; latent heat recovery device 9: water supply pipe 10: exhaust pipe 11; packed bed 12: hot water storage section 13: 1 exhaust gas supply pipe: detergent storage container 20 : Solenoid valve 21: Timer 22: Supply pipe 2 23: Water supply pipe 24: Ball tap

Claims (1)

[Claims] 1. A latent heat recovery device for a hot water supply device having the following configuration, characterized in that detergent is injected into a fluid circuit passing through the latent heat recovery device at predetermined time intervals. automatic cleaning equipment. a, a prime mover with exhaust gas from a gas engine, diesel engine, gas turbine, etc. (hereinafter referred to as engine); b, a coolant heat exchanger using hot water for cooling the prime mover as the primary heat source of the coolant heat exchanger; c. A gas/liquid direct latent heat recovery device (hereinafter referred to as the latent heat recovery device) comprising a packed bed formed by stacking fillers and a hot water storage section located at the bottom; d. A device for supplying water to the latent heat recovery device. A water supply pipe e, an exhaust pipe f that supplies the exhaust gas of the prime mover to the latent heat recovery device, an exhaust pipe g that releases the exhaust gas from the latent heat recovery device, and hot water discharged from the hot water storage part of the latent heat recovery device as a heat source. A hot water heat exchanger h that heats the supply water to hot water, a route 2 in which the hot water of the hot water heat exchanger is reheated by the cooling water heat exchanger, and this is converted into high-temperature water and is supplied for hot water supply, the following configuration: 1. An automatic cleaning device for a latent heat recovery device for a hot water supply device, characterized in that a detergent is injected into a fluid circuit passing through the latent heat recovery device at predetermined time intervals. a, a prime mover b with engine exhaust gas, a cooling water heat exchanger c that collects and uses not only hot water for cooling but also exhaust pipe heat as the primary heat source of the cooling water heat exchanger; A latent heat recovery device d comprising a packed bed formed by stacking fillers, a hot water storage section located at the bottom, a water supply pipe e for supplying water to the latent heat recovery device, and supplying exhaust gas from the prime mover to the latent heat recovery device. an air supply pipe f for discharging the exhaust gas from the latent heat recovery device, an exhaust pipe g for discharging the exhaust gas from the latent heat recovery device, a hot water heat exchanger h for heating the supplied water to hot water using the hot water discharged from the hot water storage section of the latent heat recovery device as a heat source, and the hot water The hot water of the heat exchanger is reheated by the cooling water heat exchanger, and this is made into high-temperature water. Path 3 is supplied for hot water supply. As the detergent, a non-polluting special detergent such as New Apollo (trade name) is used. An automatic cleaning device for a latent heat recovery device for a hot water supply device according to claim 1 or 2, wherein the device is configured as follows. 4. Equipped with a detergent storage container, a solenoid valve, a supply pipe, and a timer.The solenoid valve is opened and closed at each time set by the timer, and detergent is supplied from the detergent storage container to the latent heat recovery device at regular intervals via the solenoid valve and supply pipe. An automatic cleaning device for a latent heat recovery device for a hot water supply device according to claim 1 or 2. 5.Claim 1, wherein a ball tap is arranged in the hot water storage section of the latent heat recovery device, the water level in the hot water storage section is monitored by the ball tap, and water is automatically supplied to the hot water storage section when the water level falls below a predetermined level. Alternatively, the automatic cleaning device for a latent heat recovery device for a water heater according to 2.