Industrial production is inseparable from boilers, emission control of atmospheric pollutants boiler air pollution control in Shanghai to expand and intensify the focus of the project. Currently, Shanghai Industrial boilers alternative clean energy has been completed, nitrogen oxides (NOx) emissions of major pollutants as a boiler, the boiler due mostly low shelf emission source of ambient air near the ground and ozone greater PM2.5 influence, therefore, this release the new standard, the boiler will be low-nitrogen transformation, improve Shanghai air quality, protect people's lives and health and other aspects demand a strong thrust of great significance. Throughout the country, Beijing, Tianjin and other places have started low-nitrogen transformation boilers for low-nitrogen transformation has a more mature technology reserves. Based on the above considerations, for the effective control of NOx emissions from boilers, to further deepen cooperative control of PM2.5 and ozone, according to the standard first, to further accelerate the transformation of governance principles, it is necessary once again to revise the standard boiler.
According to local environmental standards and revision procedures, the Municipal Environmental Protection Bureau held a meeting to hear the relevant departments, enterprises and the opinions and suggestions of experts, and in 2017 August 4 to September 15 in the online open standard full text to solicit public opinion. At the same time the Ministry of Ecology Environment solicit written opinions Municipal Development, City Commission by letter and other related commissioned Bureau, industry organizations and boilers, production units and other enterprises. Municipal Environmental Protection Bureau and the Municipal Quality and Technical Supervision on January 19, 2018 organized the expert technical review meeting, the panel agreed that standards through technical review. Approval by the Municipal Environmental Protection Bureau and the Municipal Quality and Technical Supervision audit report to the municipal government.
The new standard has been revised for several aspects, one is no longer on the "central heating boiler and the nominal amount of evaporation less than 65t / h boiler cogeneration" provisions alone time; the second is to simplify the original class standard boiler merged into " gaseous fuel boiler "and" boilers "categories; are three different degrees of contamination tightened limits particulate matter, sulfur dioxide and nitrogen oxides; four new boiler is implemented from the date of implementation of this standard, the boiler given a transition period of about two years.
New standards for gaseous fuel boiler particulate matter, sulfur dioxide and nitrogen oxides are applied strict limits, but mainly considering the control of nitrogen oxide emissions, and further improve air quality. In the transition period boiler (1 October 2020) to limit nitrogen oxide 150mg / m³; after a transitional period of 50mg / m³. Date of implementation of new boiler nitrogen oxides from standard starting execution 50mg / m³ limit. Taking into account the comprehensive utilization of straw in Shanghai, biomass fuel boilers follows the standards of the original project control and limit requirements.
Gas boiler room location should pay attention to these issues need to pay attention to the location of gas boiler room boiler room of a problem than how specific to the site, more customers just curious boiler room and other buildings safe distance, do have customers believe boiler room just fills the room, as long as the boiler plant went on line, do not need to sun and rain. But in fact, the boiler room location is very important, it is related to a series of questions of your initial investment and system planning, job handling and safety protection. With gas boiler, for example, for us to introduce issues related to pay attention to the orientation of the boiler room. 1, the orientation of the gas boiler room should be summarized gas type, boiler capacity, operating pressure, supply and return water temperature, the system in the form of building types and other factors to consider. 2, natural gas boiler room planning should be "boiler room planning norms" (GB50041-2008), "town gas planning norms" (GB50028-2006), "building plans for fire protection" (GB50016-2006), "the senior civilian in accordance with existing national norms architectural plans for fire protection "(GB50045-95) (2005), and" 3 5 mw hot water boiler safety skills supervision "(labor pan word  No. 7) are summarized concluded. If there are local with local codes, with the satisfaction to consider. 3, gas boiler room should be set in separate buildings on the ground, if the conditions are bound, connected to the main building or need to set up in the basement of the main building, semi-basement, while the first floor, the top floor and center floor, shall be approved by the local fire, safety supervision and environmental protection part of the agreement. 4, gas boiler room directly prohibit people gathered in the room (such as public baths, classrooms, auditoriums, shops, restaurants, waiting rooms, etc.) or at the top, bottom, or top lax immediate neighborhood of the mouth on both sides. 5, the new residence should not be connected to the boiler room, boiler room and other adjacent buildings, the wall adjacent to the firewall. Boiler room on the ground should be flat without steps, and should prevent accumulation of water. 6, because the conditions there are shackles, located in the basement boiler need, center or top floor high-rise buildings or multi-layer, prior consent of the city, prefecture-level and above safety watchdog agree. In addition to the above requirements satisfaction, it should also be satisfied: (1) each boiler rated evaporation does not exceed 4t / h, the vapor pressure does not exceed the rated 1.6MPa. (2) oil is necessary, as a fuel gas or electric heating boiler. (3) the fuel supply line adapter using welding backing. 7, as provided in the boiler room in the basement or the first half-layer or multi-layer high-rise buildings, it is necessary to fit together the following conditions: (1) each boiler rated evaporation does not exceed 10t / h, the vapor pressure does not exceed the rated 1.6MPa. (2) Each boiler necessary to have reliable overpressure protection device interlock and interlock the bottom level protection. (3) accessories and safety interlock protection device for each boiler to regular maintenance and experiments to ensure active, reliable. (4) the building structure between the boiler should be the appropriate seismic measures. (5) operating independently fireman fireman operating permits necessary to hold the appropriate level of boiler and continuous operation of the same class more than five years, has not had trouble occurs. (6) the need to have lax security channel.
Coal-fired steam boiler scale can cause harm and failure scale is the first coal-fired steam boilers, coal-fired steam boiler is the main cause of the accident, the danger main problems: wasting a lot of fuel: Because the thermal conductivity of the scale of only a few steel one tenth, so that the heating surface when the fouling of heat transfer will hindered, in order to maintain a coal-fired steam output, it is necessary to increase the temperature of the side of the fire, so that the external radiation and flue gas heat loss. Now can be used efficient and environmentally non-corrosive cleaning agent fired steam cleaning, expose the metal tube so that the device primaries, and to reduce biological fouling of algae because silt impact. While the peeling effect of iron on the iron oxide and ethylene, prolong the service life of coal-fired steam boilers, to reduce energy consumption and improve productivity. Fired steam after a long run, the inevitable emergence of scale, the problem of corrosion, scale coal-fired steam boiler formation is mainly due to the water with hardness components, high temperature, high pressure after continuously concentrated by evaporation, the coal-fired steam furnace with a series of physical, chemical, and finally heating surface to form a hard, dense scale, resulting in reduced heat transfer and the effect of corrosion under the scale factors, leads to a reduction endothermic coal-fired steam boiler waterwall furnace, burning coal steam boiler furnace exit temperature increases, the increase in the loss of coal-fired steam boilers. After scaling while reducing the heat transfer within the water wall, water wall tube wall temperature may lead to increased water wall lead to burst pipes, affect the safe operation of coal-fired steam boilers.
Gas steam boiler and the hydraulic classification precision classification by use gas steam boiler 1, an industrial gas steam boiler: heating and the like used in industrial production. Most of the parameters for the low, low capacity boilers, the fire bed combustion and thermal efficiency is relatively low. 2, power station boilers: mainly for power generation. Most high-parameter, large-capacity boiler, firebox and allow more efficient combustion. 3, the ship's boiler: a marine power. Such boilers generally low parameters, fuel oil, the requirements of small size, light weight, easy to move more. 4, locomotive boiler: The main use of locomotive power. Lower overall parameters are small capacity boilers, fire bed combustion, requires compact, movable. Two gas steam boiler in accordance with the kind of the working fluid and an output state classification can be divided into: 1, the steam boiler: the working fluid is steam outlet. 2, 3 5 mw hot water boiler: hot water as the working fluid outlet. 3, special working fluid boiler: export of special working fluids, such as certain organic matter. Three outlet gas steam boiler in accordance with the pressure of the working medium can be divided into: 1, pressure boiler: the outlet steam pressure 14MPA (140kgf / cm). 2, high-pressure boiler: the outlet steam pressure 10MPA (100kgf / cm). 3, sub-pressure boiler: the working fluid outlet pressure of 2.5MPa. 4, pressure in the boiler: the outlet steam pressure of 3.9MPa (39kgf / cm). 5, supercritical pressure boiler: outlet steam pressure is about 25MPa (about 250kgf / cm). 6, subcritical pressure boiler: outlet steam pressure of 17MPa (170kgf / cm?). 7, low-pressure boiler: the outlet refrigerant pressure (gauge pressure) is less than or equal to 1.3MPa (13kgf / cm). Accuracy of the hydraulic machine, determines the precision of the parts. However, only static accuracy to measure the level of accuracy of press is not very accurate. This is because the size of the mechanical strength of the press itself has a great influence on the punching accuracy. If the strength of the press itself is low, the machine will be modified such that the pressure at the instant of Ao punching pressure is reached, so that, when the above-described conditions in a static tune even good, also since the strength of the deformation caused by the sample bed, differences occur. This indicates that the accuracy of the press and has a lot of strength, and the magnitude of the intensity of the work has a great influence on the press, so that high-precision parts and punched continuous strong cold stamping, the accuracy must be selected high, and the rigidity of the press.
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