JPS5842797Y2 - Automatic cleaning rotary heat exchanger - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rotary heat exchanger having an automatic cleaning mechanism.

For example, a method of recovering waste heat from a dryer, exchanging heat with fresh outside air using a regenerative rotary heat exchanger, and returning the waste heat to the dryer is well known as a conventional method.

The decisive problem with such waste heat recovery equipment is that the waste air often contains oil mist, etc., which collides with the heat transfer surface of the heat exchanger. During cooling and heat dissipation, this condenses and adheres to the heat transfer surface of the heat exchanger, gradually reducing the heat exchange performance.

The purpose of the present invention is to eliminate the above-mentioned drawbacks and provide a waste heat recovery device that has an automatic cleaning function that keeps the heat transfer surface clean and uncontaminated even after long-term operation, and that does not deteriorate in performance.

To this end, the present invention injects a high-temperature emulsion of detergent, steam, and air at high speed onto the high-temperature waste gas side of the heat transfer surface, and causes the emulsion to collide with the heat exchanger element, thereby removing contaminants attached to the element. It was designed to do so.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to figures showing one embodiment.

In FIGS. 1 and 2, 1 is a heat exchanger main body, and a header 8 having two or more injection nozzles 10 is disposed in front of the high-temperature exhaust gas side passage of the heat exchanger main body 1, that is, on the return air side, and further A filter 6 for passing high-temperature waste air is arranged in front of it.

A heat exchanger element 19 is installed inside the heat exchanger body,
A blower 2 for sucking waste air is installed at the rear of the high-temperature waste air side passage of the heat exchanger body, that is, on the exhaust side, and a filter 3 for sucking outside air is installed in front of the outside air supply side passage of the heat exchanger body, that is, on the outside air side. Furthermore, a blower 4 for sucking outside air is installed at the rear, that is, on the air supply side, and is connected to a device that generates waste heat, such as a dryer 5.

The injection nozzle 10 is installed at a substantially right angle toward the heat exchanger element 19, and as shown in FIG. 12a are formed separately, air and detergent are automatically sucked in by the negative pressure caused by the injection of steam S, and the main injection of steam and mixture can be performed. The detergent is supplied from the inside of the detergent storage tank/drain receiver 14 through the detergent suction pipe 13 and to the detergent suction port 9 via the detergent regulating valve 12.

A detergent spray drain 15a having a drain outlet 15 is installed at the bottom of the heat exchanger main body 1 so that the detergent can flow back to the detergent storage tank/drain receiver 14, and the detergent storage tank/drain receiver 14 is equipped with a baffle. Install the plate 16.

Reference numerals 17 and 18 are a steam valve opening timer and a steam valve closing timer.

Next, talking about the flow of air for heat recovery, waste air discharged at high temperature and high humidity from a device that generates waste heat, such as a dryer 5, passes through a filter 6 through an exhaust air duct to filter out solid contaminants. heat exchanger element 1
The heat is emitted at 9, cooled, and discharged outdoors by blower 2.

On the other hand, low-temperature fresh air enters the heat exchanger through the filter 3, passes through the heat exchanger element 19, receives heat, becomes high temperature, is sucked by the blower 4, and is sent to the dryer.
Used again for drying.

Regarding the automatic cleaning function, if you set the steam blow-off timer every 2 hours and set the blow-off duration timer to 2 minutes, flushing will be performed for 2 minutes every 2 hours.

When the steam blow-off valve 7 is opened, steam passes through the header 8 and is ejected from the nozzles 10 (plurality), but at this time, the detergent from the storage tank 14 is sucked through the detergent suction pipe 13, and at the same time, the detergent from the storage tank 14 is sucked into another air intake port 9. More air is inhaled and steam is produced,
An emulsion of air and detergent is injected from the opening and impinges on the heat transfer surface, washing away the contaminating mist.

At this time, the propellant, which sucks air and becomes bubbles, ruptures upon impact and generates a small amount of ultrasonic waves, enhancing the cleaning effect.

Oil mist condenses and adheres, accumulates and solidifies over time, but as a result of experiments, according to the present invention, normal mist
For example, in the case of drying textile products, it was possible to easily purify them by spraying an emulsion of steam, solvent, and air for about 2 minutes once every 2 hours, and it was possible to maintain sufficient heat transfer efficiency.

Table 1 shows the characteristics of recovery efficiency, where A is the result for the heat exchanger of the present invention and B is the result for the conventional heat exchanger.The present invention can maintain high efficiency.

In addition, the waste heat recovery device of the warping sluice shear was installed in a sizing dryer, which is widely used in textile factories, and the device according to the present invention was installed and operated, and the following results were obtained.

Exhaust air amount 5530 NM3/min Exhaust air temperature
80℃ Energy savings 0, 34 x 109Kcal/
Annual fuel savings: 42.6071/year Energy savings: 2,140,000 yen/year, and by using this device, which used heavy oil for 17 months, 3550 l/month can be saved, and consumption of 64,501/month has been reduced. It became.

That is a savings of 35.5%. As described above, according to the present invention, a high-temperature emulsion containing a mixture of detergent, steam, and air can be injected at high speed onto a heat exchanger element using a cleaning device with an extremely simple configuration. In particular, oil mist, which affects heat exchange efficiency, can be removed extremely efficiently, and the exchange efficiency of the heat exchanger can be maintained at a good level at all times, providing superior effects that cannot be expected from conventional heat recovery methods. Therefore, it has a great energy saving effect and has a very high industrial value.

In the above, the header 8 having the nozzle 10 is installed on both front and rear sides of the heat exchanger element 19 in the high-temperature waste gas side passage to sufficiently clean the entire depth of the element. In addition, it is advantageous to be able to move the element into a lateral position to prevent contamination.

[Brief explanation of drawings]

FIG. 1 is a route map showing an example of the device of the present invention, FIG. 2 is a schematic side view of the main parts thereof, and FIG. 3 is a sectional view of the nozzle. Code 1 is the heat exchanger body, 8 is the steam blowing header, 9
is an air intake port, 10 is a nozzle, 12 is a detergent adjustment valve, 12
a is a detergent inlet, and 19 is a heat exchanger element.

Claims (1)

[Scope of utility model registration request] Immediately before the rotating element of the high-temperature waste air side passage of the heat exchanger body, that is, on the return air side, there is a steam injection nozzle directed toward the rotating element of the waste air side passage, and the steam is sucked in near the injection port with negative pressure. An air intake port and a cleaning intake port are respectively disposed via an intake amount adjusting valve, and a cleaning device is arranged to control the opening/closing operation of the steam valve of the steam injection nozzle by an opening/closing timer. Automatic cleaning rotary heat exchanger.