boiler exhaust heat recovery
The difference between hot water and steam boiler exhaust heat recoverys of the boiler as a heat medium for air conditioning, heaters, low temperature oven drying equipment, textile and the hot water tank is heated by a variety of low-temperature, heat transfer and air-conditioning coil equipment. Hot water as a heat medium has the following advantages: 1. Generally the lower the heat medium water temperature of the heat medium, and large temperature difference between the flue gas, boiler exhaust gas temperature is relatively low, and thus higher boiler efficiency. 2. Closed hot water supply system small amount of water and sewage rate is much smaller than the steam boiler, waste water is also smaller. And lower boiler water quality requirements, less the cost of water treatment. 3. The specific heat capacity of water is large, a large hot water system capacity, strong heat storage capacity. When the thermal conditions or hydraulic failure condition a short time, without significantly heating conditions cause large fluctuations. 4. pump hot water heating system can be used for long-distance transportation, a small heat loss, heating large radius, to adapt to the requirements of urban planning central heating. The hot water temperature is low, less heat transfer coefficient, thermal efficiency is relatively low as the heat medium heating major drawback. Present predominantly of boiler steam boiler, steam as a heat medium main advantages are: a low cost, wide adaptability, can meet the heat requirements of the various users have different requirements for temperature and pressure simultaneously; 2 nontoxic. directly heating food, even if leaking would not harm the environment; 3 high steam temperature, a large latent heat of vaporization, the heat transfer area can be reduced relative to the hot water device, reduce costs; 4 hot inert small, heat faster when the steam supply, the cold disappear just as quickly when the steam stop. Since the heating medium steam condensate recovery is difficult, resulting in waste and water latent heat. Even with condensate recovery, condensate recovery in the process, because water easily dissolved oxygen and other impurities, but also easy to cause harm to the boiler. Oxygen to the water, salt and other impurities cause boiler fouling, corrosion and other problems affecting the safety and energy efficiency of the boiler.
Fang faster work on clean fuel boiler exhaust heat recoverys more than twenty years, whether it is research and development or manufacturing fields have achieved remarkable results. The launch of the "Euromonitor 5" series boilers, the company's new low-nitrogen boiler, using advanced FGR combustion technology, nitrogen oxide emissions below 30mg / m3, our first-tier cities can be used normally. Remote monitoring system is to attract the attention of the participants. Jumping curve data, real-time display operating status boiler; detailed data analysis and fault early warning program, Fang fast "black technology", making the boiler to get rid of "silly Big Ben rough" image and become intelligent high-tech incarnation.
Use hot water boiler exhaust heat recovery and hot water boiler works mainly heating and bathing two purposes. Through the hot water circulation pump circulating the hot water tank insulation, the heating cycle hot water tank, may be achieved bath object; circulation pump for circulating water through the hot water heating conduit, through the heat sink (radiator) can live up to the requirements of heating ; hot water boiler and hot water circulating pump with heat exchanger can be achieved bathing and heating dual function. Natural circulation boiler water, into the water were taken over from the top of the drum, the water from the water distribution pipe guide and drop into the front side lower header pipe, through the waterwall tubes heating rise. The front drum, rear end plate is provided with impermeable boundary falling rising flow, only the lower half of the drum cross-impermeable partition plate. For the forced circulation, the water access to the front end of the lower header, the front drum increases to upper waterwall tubes (waterwall downcomer Cancellation time), and then transferred to the waterwall tubes downcomer side to side lower header, then into the side of the cloth water wall tube rose to the drum, and from the front row convection bank down to the next drum, and finally between the upper and lower drum and several circuitous flow of water from the rear end of the drum.
In the case where the fuel consumption is constant, the lower the heating system return, the more condensing heat recovery heat recovery, the higher the thermal efficiency of the boiler exhaust heat recovery. Using condensing gas boiler than ordinary gas boiler can save more operating costs.
1 million kcal / h boiler, for example, natural gas consumption of the conventional type boiler 126.5Nm³ / h (natural gas low heat value 8500kcal / Nm³), consumption of natural gas condensing boilers 110Nm³ / h, when the boiler is operating 10 hours a day, heating period of 100 days, then the use of natural gas condensing boiler annual savings 16500Nm³, natural gas price of 1.8 yuan terms, annual savings of operating costs 29,700 yuan.