how to calculate hot water boiler thermal efficiency

What are the requirements should be equipped with general how to calculate hot water boiler thermal efficiency circulation pump and two kinds of water supply pump, the boiler is the hot water circulating in the system, it is necessary to use the circulation pump, the hot-water boiler system is to make the circulating pump and fill pump water boiler water loss at the same time be supplemented, you must use the fill pump. First, selection of a hot water boiler circulating pump 1, the flow rate of circulating pump, should be determined that the user heat consumption and pipeline heat loss temperature difference depending on design and other factors. When the bypass pipe mounted between the boiler and the circulating pump outlet pipe inlet pipe, it should be included in the cycle of water flow through the tube Wangpang. 2, not less than circulating pump head of each of the following: ① hot water boiler or heat exchanger inside the pressure drop across the system. ② supply and return water mains pressure drop. ③ pressure drop within the system user. 3, circulating pump operating in parallel, using a characteristic curve should be the same. 4, the number of circulating pumps of heating systems should be based on the size and operation mode determining adjustment, generally not less than two. When any one stops running, the total flow of the remaining water pump should meet the needs of the largest amount of circulating water pump, and reliable measures after a sudden over-temperature boiler pump, boiler water vapor and water hammer should have prevented. Second, the selection of a hot water boiler supply pump in claim 1, the flow of boiler feed water pump, in addition to the normal quantity of feed water should meet the hot water boiler system, due to an accident should meet the increased quantity of feed water, typically 4 to the normal quantity of feed water 5 times. 2, the supply pump head, not less than replenishment point pressure plus 3 × 104 ~ 5 × 104Pa. 3, the supply pump is generally not less than two, wherein a spare. 4, it should be equipped with automatic hot water boiler feed water means and the water supply means provided with manual control of the pump operation or division location fireman.

Third, to maintain a certain temperature difference between flow and return can improve the thermal efficiency

Condensing boiler circulation pump in the heating system used is a keep up the flow of water medium, so that the high-temperature water in the boiler to the end device comes out. But the circulation pump in the boiler is a certain speed, that is, no matter how much power in a condensing boiler combustion, a circulation pump is always in operation speed, the use of variable frequency pump, pump speed changes with power boiler changes, it will make flow and return temperature is maintained constant temperature difference, so to maintain a certain temperature difference between flow and return of the thermal efficiency can be improved.

3. Water rinse after pickling and pickling

Pickling effect is to deposit a metal wall from insoluble into soluble salts or complex, dissolved in the cleaning solution, then when the waste liquid discharge drain.

1) monitoring pipe system to be cleaned in the acid feed to a predetermined concentration, into the circulatory system, monitors and controls the flow tube and the flow rate of the washing water is cooled in the boiler wall tubes similar.

2) cleaning solution must strictly control the temperature of the pickling solution in pickling, cycle rate, liquid level in the drum of the acid tank, and one hour intervals, check cycle time, record truthfully problems.

3) When the cleaning cycle each circuit to a predetermined time, and measuring the concentration of the acid concentration of iron ions should be strengthened. When each circuit in the pickling solution ferric ion concentration and acid concentration and stable balance, pickling is expected to end, the detection tube can be removed to check the cleaning effect, when the inner pipe is still dirt to be monitored in the pipe system Replacing continue cleaning to clean the monitoring pipe, the circulation should IH, stopped before pickling.

4) the activated metal surface to prevent secondary rust, at the end of pickling acid should not be used directly by the process of emptying the flushing water on again, a purity of greater than 97% of the available continuous ejection nitrogen waste acid, may also be used in addition to salt water ejection waste acid, the acid using variable flow ejection flushing water, flushing water flow rate to be achieved purge rate more than doubled. Possible to shorten the washing time, rinse water to the discharge liquid Ph value of 4 to 4.5, until the iron content of less than 50mg / L.

Heating and hot water daily is an important basis for maintaining the northern region of the normal operation of enterprises; for Legal Daily organs and units, the how to calculate hot water boiler thermal efficiency is one of the indispensable energy equipment. Currently, work is facing north Heating equipment and facilities aging, increase energy conservation and environmental protection requirements and other issues. Daily logistics-related legal person responsible for improving the overall level of heating units, and the response advocated by the national energy saving, plans to purchase energy-efficient heating boiler. Considering the increasingly stringent environmental policy, Legal Daily authorities decided to use natural gas as boiler fuel. Fast boiler for 20 years, specializing in the production brand boiler, which had been successfully assisted more than Beijing enterprises and institutions, to provide clean heating. The party technical consultant fast boiler based on actual usage Legal Daily units, providing commercial condensing units 99KW vertical 1 hot water boiler.

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