china oil water tube hot water boiler prices

The heat loss of exhaust smoke is the largest of all kinds of heat loss in boiler. Generally, the heat loss of exhaust smoke is 6% of the heat fed into the furnace, and the heat loss of exhaust gas increases 0.5% when the temperature of exhaust gas increases by 12 ℃ and 15 ℃. So the exhaust temperature is one of the most important indicators of boiler operation. The following are several possible causes of increased flue gas temperature in the furnace: (1) slagging and ash accumulation on the heated surface. No matter it is the slag accumulation in the water-cooled wall of the furnace, or the ash deposition in the superheater, convection tube bundle, economizer and preheater, the thermal resistance of the flue gas measurement will increase, the cooling effect of the flue gas will become worse due to the deterioration of the heat transfer, and the exhaust temperature will rise. (2) excess air coefficient Big. Under normal conditions, the exhaust temperature increases with the increase of excess air coefficient at furnace outlet. After the increase of excess air coefficient, although the amount of smoke increased, the rate of smoke increased, and the convection heat increased, the increase of heat transfer was not as much as that of the increase of flue gas. It can be understood that after the increase of smoke speed, the flue gas leaves the heating surface without time to transfer heat to the working fluid. (3) the air leakage coefficient is too large. The flue gas leakage in the furnace and rear shaft of a negative pressure boiler is inevitable and the leakage coefficient allowed by a certain heating surface is specified. When the air leakage coefficient increases, the effect on the exhaust temperature is similar to that of the superheated air coefficient. And the air leaks away. The closer the furnace is, the greater the influence on the rise in exhaust temperature. (4) Water supply temperature. When the steam turbine load is too low or the high pressure heater is out of line, the feed water temperature of the boiler will be lowered. Generally speaking, if the fuel quantity is kept constant, the heat transfer temperature difference of the economizer decreases and the heat absorption of the economizer decreases when the feed water temperature is increased, which makes the exhaust temperature increase. (5) moisture in the fuel. The increase of moisture in the fuel increases the amount of smoke, thus increasing the exhaust temperature. (6) Boiler load. Although the boiler load increases proportionally, the amount of smoke, the amount of steam, the amount of water supplied, and the volume of air increase proportionally, however, the flue gas temperature at the furnace outlet increases proportionally. Increase, so that the exhaust temperature increased. After increasing the load, the outlet temperature of the furnace increases, the heat transfer temperature difference of the convection heating surface increases and the heat absorption increases. Therefore, the more the convection heating surface is, the less the influence of the boiler load on the exhaust gas temperature is. (7) fuel varieties. When the low calorific value gas is fired, the radiative heat transfer in the furnace decreases due to the decrease of furnace temperature, and the non-combustible components in low calorific value gas, mainly N _ 2, CO _ 2 and H _ 2O, increase the amount of flue gas, so the exhaust temperature increases. Although the excess air coefficient of furnace outlet is lower than that of coal burning, the ash content in the fuel oil is very low after the pulverized coal furnace is changed to burn oil, although the excess air coefficient at the furnace outlet is lower when burning oil. There is no larger ash particle in flue gas, and there is no cleaning effect of larger ash particle on the heating surface, and the convection heating surface is polluted more seriously. Therefore, combustion is not good, often smoke-emitting boiler smoke temperature rise. When there is a steel ball dust removal device at the tail, the exhaust temperature is slightly lower than that of burning coal because the tail is cleaner. (8) the operation mode of pulverizing system. For a closed pulverizing system with a silo, when the pulverizing system is in operation, as a part of the water in the fuel enters the furnace, the furnace temperature decreases and the flue gas increases, and the cold air leaking into the pulverizing system enters the furnace as a primary air during the operation of the pulverizing system. Reduction of air flow through air preheater To raise the exhaust temperature. On the contrary, when the pulverizing system is shut down, the exhaust temperature decreases.

This year, Hubei Province, will continue to carry out prevention and control of air pollution control, effectively promote the province's environmental air quality improved, and issued the "2019 Annual Hubei ecological system of air pollution prevention and control program of work", as follows.

First, ultra-low emissions and actively promote the transformation of key industries. The province's new coal-fired thermal power units fully implemented ultra-low emissions standards. Actively promote small coal-fired thermal power ultra-low emission transformation, Wuhan, Xiangyang, Yichang and other places to complete before the end of 2019. Circulating fluidized bed boiler unit to achieve ultra-low emissions before the year 2019, tobacco dust W flame boiler units, to achieve ultra-low sulfur dioxide emission limit requirements. Ultra-low emissions and actively promote the transformation of the steel industry, the whole process to reduce air pollutant emissions.

Second, the depth of key industries mentioned standard upgrade. Promote the implementation of major cities in key industries especially emission limits, strictly enforce the "Notice on the implementation of some key cities in particular air pollutants emission limits" (Provincial Environmental Protection Bureau Bulletin 2018 No. 2), advance planning to enact governance project, and accelerating coking industry desulfurization and denitrification projects. According to the national unified deployment and actively carry out industrial furnaces governance special action. Complete waste discharge permit issued in accordance with the work list management requirements.

Third, the total coal consumption in key areas to promote control. Actively cooperate with relevant departments to implement controls total coal consumption in key areas, focusing on reduction of non-coal for electricity. With the relevant departments to promote the commercial coal quality control and supervision of bulk coal sales, strengthen the management and control of coal consumption, promoting the use of clean coal.

Fourth, the optimal adjustment of high-pollution fuel combustion zone ban. Control Department of Ecology Environment "high-pollution fuel directory" to improve the demand by the City People's Government in accordance with the ambient air quality, energy consumption structure and affordability, local conditions choose ban combustion zone ban burning of the fuel mix category, supervise the implementation of the relevant control requirements. Urban cities and states to complete high-pollution fuel combustion zone ban optimal adjustment before the end of 2019.

Fifth, to carry out rectification of coal-fired boilers. Carry out coal-fired boilers out of looking back, resolutely combat the resurgence of acts of the boiler has been eliminated. The county level and above urban area actively eliminate 10 tons of steam per hour coal-fired boilers and furnaces and tea, operating the stove, grain storage and drying equipment, coal-fired facilities, in principle, to a new 35 tons of steam per hour of fuel coal boiler. Actively promote the upgrading coal-fired boilers environmental protection facilities renovation and construction of facilities on-line monitoring, adherence to the "gas will change," the principle of steady progress "from coal to gas."

How to prevent china water tube hot water boiler prices hot water boiler explosion belongs to special equipment, but also a high temperature and pressure of thermal equipment, there will be some failures during operation, these are normal, but if not handled properly heat is likely to occur water boiler explosion. So, for safety equipment and personal safety, we have to understand some common sense prevention hot water boiler explosion. 1, the hot boiler explosion accident prevention boiler in strict accordance with GB50041-1992 "boiler room design specifications" of the design should be in thermal calculation and strength calculation, structural arrangements should be fair, the selection should be qualified. Manufacture of boilers, construction plans should ensure compliance with national quality boiler scale delineation. Boiler safety accessories should be complete, agile and reliable, and maintenance schedule, often check on the failure of the annex should be replaced. Maintenance schedule by part of the boiler to the boiler, external maintenance, the existence of a timely topic for repair and reconstruction, to ensure test quality. 2, fuel, gas hot water boiler furnace explosion prevention hot water boiler furnace point to double-check each gas line, oil line is tight (leak), pressure is normal, Installation and reconstruction of new oil and gas pipelines necessary to purge and clean. Check the ignition lead before the drum whether the fan has to take the air 5 ~ 10min, after ignition failure to analyze the reasons, then the ignition process to take the air ignition. Boiler use permit and inspection certificate did not apply for the boiler, furnace stokers right to refuse point. Enterprises should have a great fireman layout of manipulating evidence of experience points furnace fireman, fireman staff should strengthen the inspection tour, identify problems in time to prevent stalling, stalling once found, should immediately cut off fuel boiler installation should be controlled protection, including automatic ignition , flame protection, automatic adjustment of combustion and the necessary alarm chain protection.

Working principle and structural characteristics of steam boiler

Steam boiler has brought great convenience to industry. Steam boiler has driven the development of the times. The following is a brief introduction to the structural characteristics and working principle of steam boiler. Steam boiler is a machine that mainly produces steam, and many people use it, but many of them do not know much about its structure and working principle. It makes use of coal, oil, natural gas and other water-tube steam boilers with limited capacity and pressure. There is a large desire to space, and easy to arrange, steam boiler in a variety of forms. Water is heated in the drum into steam, and the heat emitted by fire in the furnace is the principle of a steam boiler. Work of steam boiler Principle:

1, the heat generated by pulverized coal combustion in the furnace is first absorbed by the water wall through radiative heat transfer, and the water boiling of the water wall is vaporized, producing a large amount of steam into the steam drum for steam separation (except for direct flow furnaces). The separated saturated steam enters the superheater and continues to absorb the flue gas heat at the top of the furnace and the horizontal flue and the tail flue through radiation and convection, and enables the superheated steam to reach the required working temperature. The steam boiler for power generation is usually equipped with a reheater, which is used to heat the steam after the high-pressure cylinder does work, and the reheat steam comes out of the reheater to go back to the middle, and the low-pressure cylinder continues to do the work to generate electricity.

2. When the pulverized coal stove is working, The position of the center of the flame will affect the amount of evaporation, generally speaking, if the center of the flame is low, the amount of evaporation will be large, and the position of the center of the flame will also affect the temperature of the superheated steam or reheated steam, as well as the high value of the flame center and the small amount of evaporation. When the flame center is low, the superheated steam, especially the reheated steam temperature, will be low and vice versa.

3, the arrangement of burners, as far as coal powder furnace is concerned, there are many kinds of combustion modes, such as front and rear wall, tangential combustion, double tangential combustion, and so on, each of which has its own characteristics. The influence on steam can not be directly determined because the same furnace can not apply the above-mentioned arrangement methods at the same time.

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