On the whole, lower consumption of coal-fired boilers, but there are environmental risks, many new coal-fired boilers enterprises are also faced with the situation of environmental transformation or replacement, post huge investment costs.
We learned from Zhenjiang Municipal Environmental Protection Bureau, to further promote the Battle of Blue Sky, enhance air quality, the city actively carry out biomass boiler investigation and remediation work has been completed seven bathrooms demolition of straw biomass boiler work in built-up urban area .
Biomass boiler pollution remediation has been a major focus of air pollution control, some of the city bathhouses, hotels, restaurants in the use of raw materials process boilers, illegally blended with coal, waste wood, waste and other substances, not advanced treatment of smoke, nitrogen oxides and other pollutants directly into the atmosphere, some impact on air quality.
According to relevant regulations, Zhenjiang city, the city built the region prohibited the use of straw biomass boilers, the current investigation and the bathroom were 10 straw biomass boiler, in which 7 have been removed, two shutdown ready transformation. At the same time, straw biomass boiler outside the urban area will be completed before the end of June classification renovation work, all dedicated boiler using biomass briquette students, prohibit blended with other fuels, coal, wood, etc., and must complete the construction of the bag efficient dust embodiments, emissions guarantee compliance.
Hot water boiler circulating water system related issues: a hot water boiler circulating water system shall have the following to prevent the hot water circulation pump suddenly stopped, furnace water vapor and water hammer protection measures: 1 into the circulating pump, the a check valve provided with a bypass tube between the tube diameter should be similar and the manifold, and the bypass pipe cross-sectional area of not less than 1/2 of the cross sectional area of the main pipe; shall flow and a check valve flow direction of the pump in the same direction. 2. Set weight of formula inching valve in the inlet pipe section of the circulating pump, drain pipes which overpressure can open the access to the tank or drain. Second, hot water boiler circulating water system is also designed to meet the following requirements: 1 should be mounted on each cut-off valve or valve outlet pipe boiler, boiler feed water, the supply should be located on the water shut-off valve and check valve. 2. The hot water boiler is running in parallel, the control valve to be provided on each boiler inlet, so that the deviation of parallel boiler water temperature does not exceed 10 ℃. 3. The boiler water outlet pipe portion at the top and easy accumulation of gas should be installed and the exhaust gas collection means, not less than an exhaust valve DN20.4. Minimum system at low and recesses, should be arranged drainpipe and drain valve . The hot water system should be water pipe back to facilitate the installation position Qingtao decontamination, before and after the decontamination and closing the valve should the pressure gauge, and a small charge of 1 to 2 ratio of the bypass pipe. 6. The boiler should be provided with a plurality of trap and sump for hotspots, catchment trap and drain valve shall be arranged, thermometers, pressure gauges. Third, the hot water circulating pump of choice, shall meet the following requirements: a total flow pump shall be calculated: wherein G── pump flow (t / h); Q── total for the heat (kW); K1── net heat loss additional coefficients, k = 1.05 ~ 1.1; tg── water temperature (℃); th── return temperature (℃); G0── bypass flow rate (t / h), the bypass does not when G = 0.2 pump head should be calculated as follows: H = 1.1 (H1 + H2 + H3 + H4) H── wherein the pump head (m); H1── water boiler water pressure drop (m) provided by the boiler manufacturer, estimating 5.6MW or less forced circulation hot water boiler preferably H 8 ~ 15m =; H2── pressure loss in the boiler room of the water circulation system piping (m), according to the size of the system preferably H = 5 ~ 10m; H3── boiler room to the user the most unfavorable supply and return pipe pressure loss (m); pressure loss H4── most unfavorable internal system user (m). 3. The circulating pump flatter characteristic curve should be selected pump type, the parallel operation of the same pump model appropriate. 4. A pump circulating pump, the system should be able to withstand the hydrostatic pressure and increased pressure operation.
Firstly, the thermal efficiency of the boiler is generally ordinary only 85% -91%, while the thermal efficiency of condensing boilers are generally higher than 100%, fast boiler manufacturers thermal efficiency condensing boilers even reach 108% of higher. This extra 10% to 20% will come from the use of condensing boiler technology into full play the effectiveness of sensible heat and latent heat reached. Ordinary boiler exhaust gas temperature is high, the water vapor produced during combustion of the fuel are discharged with the flue gas from the breathing tube, a large part of the heat loss. This part of the condensing heat recovery furnace by heating return water heating system and then to improve the thermal efficiency of the boiler by reducing the exhaust gas temperature. In the same amount of gas consumption, the lower the return water heating system, furnace thermal efficiency of the condensing heat recovery boiler, the more the higher. Third, differences in treatment scaleFree Chat
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