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Flue gas waste heat recovery heat exchanger

Views: 13     Author: Site Editor     Publish Time: 2023-03-13      Origin: Site

Flue gas waste heat recovery heat exchanger


Industrial Boiler Waste Heat Recovery Heat Exchanger

The use efficiency of industrial oil, gas, and coal-fired boiler waste heat recovery is about 70%, and among the wasted heat, flue gas heat accounts for the majority. Usually, the exhaust gas temperature at the tail of steam and hot water boilers is above 280~350 degrees. Using the boiler economizer to recover this part of heat can increase the boiler inlet water temperature, blast temperature or directly generate steam production and domestic gas.


Hotel boiler waste heat recovery heat exchanger

Use the waste heat gas discharged from the boiler flue to make hot water or heating gas, and heat it simultaneously during the heating process of the boiler. The hot water and hot gas produced can be used directly or auxiliary. The modification of the boiler is extremely simple, just install and replace the gas-gas or gas-water heat exchanger produced by Vrcoolertech in a section of the boiler flue, which has the advantages of not affecting the ignition, combustion, consumption of the boiler, no need to stop business, safety, environmental protection, Features such as energy saving, investment payback period is 12-18 months.


Kitchen flue gas waste heat recovery heat exchanger

The kitchen flue gas waste heat recovery is directly installed in the back flue of the traditional boiler stove, using the heat energy carried by the boiler exhaust gas temperature at about 500-600 degrees to produce hot water and send it to the water storage tank for backup. The hot water stored in the water tank can be used for the kitchen For personal use, it can also be used for other occasions. The kitchen flue gas heat exchanger effectively reduces the exhaust gas temperature and reduces fire hazards. It automatically starts and runs along with the stove fire, without manual operation, and the stove thermal efficiency is increased by more than 30%.

boiler heat recovery


Other ways of flue gas waste heat recovery:


1. Waste heat recovery device (air-water)

The heat pipe waste heat recovery device is a special equipment for coal, oil and gas boilers. It is installed at the boiler smoke port to recover the waste heat of flue gas to heat domestic water or boiler water supply.

Its structure is shown in the figure: the lower part is the flue, the upper part is the water tank, and there is a partition in the middle. There are safety valves, pressure gauges, and temperature gauge ports on the top, and the water tank has water inlet and outlet ports and sewage outlets. When working, the flue gas flows through the flue of the waste heat return device of the heat pipe to scour the lower end of the heat pipe. In order to prevent ash plugging and corrosion, the exhaust gas temperature at the outlet of the waste heat recovery device is generally controlled above the dew point, that is, the exhaust gas temperature of fuel oil and coal-fired boilers is ≮130°C, and the exhaust gas temperature of gas-fired boilers is ≮100°C, saving fuel by 4-18%.

Waste Heat Recovery Heat Exchanger


2. Waste heat recovery device (gas-gas)

The heat pipe waste heat recovery device is a special equipment for fuel oil, coal and gas boilers. It is installed in the boiler smoke port or flue, and heats the air after recovering the waste heat of the flue gas. The hot air can be used for boiler combustion and drying materials.

Its structure is as shown in the figure: tube boxes around, the middle partition plate separates the channels on both sides, the heat pipe is a full-finned tube, and a single heat pipe can be replaced. When working, the high-temperature flue gas flows upward from the left channel to scour the heat pipe. At this time, the heat pipe absorbs heat, and the temperature of the flue gas releases heat drops. The heat pipes lead the absorbed heat to the right end, and the cold air washes the heat pipes downwards from the right passage, at this time, the heat pipes release heat, and the temperature of the air absorbing heat rises. The flue gas temperature at the outlet of the waste heat recovery device shall not be lower than the dew point.


air to air heat exchanger (3)


3. Waste heat ammonia absorption refrigeration

The absorption refrigeration unit that uses ammonia as the refrigerant and water as the absorbent to realize solution circulation is the ammonia water absorption refrigeration unit. Since ammonia is used as the refrigerant, the refrigeration temperature ranges from -30 to 5 degrees, and the application range is very wide. Waste heat recovery refrigeration can be used as an air conditioner or industrial cold source.


The waste heat recovery and utilization integrated system can recover and comprehensively utilize these low-grade waste heat, which is mainly used for heating domestic water, and also for heating and other purposes. At present, it has been applied to the fields of waste heat recovery and treatment of flue gas, utilization of geothermal water, waste heat utilization of industrial and civil sewage, heat recovery and utilization of industrial circulating cooling water, heat recovery and utilization of industrial wastewater, etc.


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