Water tube and fire tube boilers are essentially the opposite in design. In a water tube boiler, water travels through tubes which are surrounded by the by-products of combustion, or flue gas. In a fire tube boiler, the flue gas travels through the tubes, which are surrounded by hot water. Fire tube boilers are typically designed with either three or four sets of tubes (three- or four-pass boilers). Every set of tubes that the flue gas travels through is considered a “pass”. Boilers designed for three-passes have the stack at the rear, and boilers designed for four-passes have the stack at the front. A boiler with more passes has a higher heat extraction rate and is more efficient then one with less passes.
Cade Shopping Mall is located in central Shanghai Hongkou District, Shanghai Daily larger flow of people in the region. The introduction of Shanghai air pollutant emission standards, biomassification power generation system flue gas emissions of nitrogen oxide emissions to less than 80 mg / m, Shopping Mall a coal-fired boilers have been used for many years, NOx emissions far super to this request, the urgent need to replace more environmentally friendly low nitrogen emission boilers. Other units through the use of fast Boiler introduction and understanding, determined and fast boiler to achieve cooperation, party fast to their specific needs to recommend one condensing gas hot water boiler of a 4.2MW for heating needs of the shopping center.
Multiple protection fuel steam biomassification power generation system is to ensure the safety of boiler necessary condition for people in the use of fuel steam boiler products, most consider is the safety issue, then the fuel steam boiler on under a certain amount of effort in terms of security, the following look at the fuel steam boiler the multiple protection. Boiler set inside a water level gauge, you will find instructions inconsistent, you also need a simple correction, can ensure real water level, water level as well as stun guns, water can be more accurate signal acquisition and timely alarm. Here the need to use relatively high sensitivity of the pressure controller, to different signals conveying different pressure signals to the automatic gain control for protection, a single regulator may be made of fire double fire the actual situation. Multiple protection to protect a certain extent, the safety of users, eliminating the need for users to unnecessary worry, but also solve the needs of users from the fundamental.
As low biomassification power generation system heat load case, the flow through the small steam, but the steam turbine requires the corresponding low temperature, generally do not result in too high wall temperatures of the superheater platen, use of time if a desuperheater adjusting the steam temperature control, since the flow of steam after desuperheating water injected into long, the flow rate is very low, the boiler outlet steam temperature the reaction very late pure, easily lead to low-temperature steam, and water may form a plug in the serpentine tube portion. In this case it should be disposed near the secondary steam desuperheater outlet, water in minor amounts, the fine steam temperature.