oil fired vertical hot water boiler

oil fired vertical hot water boiler

Wenzhou City, Zhejiang Province, is one of the countries and determined implementation of the regional focus of the Battle of Blue Sky. In order to improve air quality in the city of Wenzhou, improve people's livelihood well-being, for the governance of air pollution, Wenzhou City, developed and introduced the "winning Blue Sky Battle action plan" (hereinafter referred to as "embodiment"), give the city the power to defend "Wenzhou blue." Program 2020, in Wenzhou PM2.5 average concentration is maintained at 35 micrograms / cubic meter (city maintained at 31 micrograms / cubic meter), air quality control over the ratio of the number of days of 90% (93% city control ), severe weather and pollution more effectively controlled.

"Plan" also lists the specific implementation timetable: by 2020, the basic completion of provincial trunk pipeline construction, the basic realization of natural gas every county, the city's natural gas consumption amounted to 570 million cubic meters. In principle, to new natural gas cogeneration and gas chemical projects. By 2020, the city's total coal consumption decreased by 5% compared with 2015, accounting for the proportion of total energy consumption fell to 42.8% or less.

There are several types of "big coal" will be gradually phased out, including environmental protection, energy, security and other non-compliance of 300,000 kilowatts coal-fired units, 10 steam tons / hour and tea furnace coal-fired boilers, around the built-up area , operating a stove, grain storage and drying equipment, coal-fired facilities, more than 10 steam tons / hour and 35 steam tons / hour of coal-fired boilers. Before the end of 2020, 300,000 kilowatts and above thermoelectric coal-fired boilers and small coal-fired thermoelectric backward within the range of 15 km radius of the heating and power plants all closed down integration.

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.

Gas pressure fired vertical hot water boiler pressure introduction gas hot water boiler: gas pressure hot water boiler pressure vessel belongs, as always pressure hot water boiler is full of water, so no water level, but to be fitted with pressure gauges, safety valves and thermometers. Circulating pump pressure hot water boiler heating system is generally used in water pump, which is pumping systems engineering backwater sent to the boiler, it is necessary to overcome the resistance of the systemic circulation, but also to maintain a certain pressure boilers, hot water does not guarantee high temperature vaporization . Pressure hot water boiler can not only supply low-temperature water, but also to supply hot water Features: 1, boiler design, manufacturing, supervision and inspection are strictly according to "hot water boiler Safety Supervision" ensure long-term security and stability of the boilers. 2, the boiler body is a shell type three return all wet back downstream pyrotechnic pipe structure, large combustion flame in combustion chamber a slight positive pressure, combustion heat load is low, less NOx emissions of harmful substances. Through advanced machine test bed to test several times to verify the boiler under various load operation can get good thermal performance, qualified flue gas emissions targets as well as a wide range of burner adapter. 3, before and after the boiler smoke box with a special heat insulation materials, high temperature, low thermal conductivity, good anti-radical quenching heat capacity, greatly extending the life of the smoke box. A lower smoke box is provided with a condensate drain, water condensed reduce corrosion of the pressure receiving member. 4, the boiler and each pot spout means disposed reasonable to optimize the pot water circulation, prevent scale generation, but also help to improve the water side heat transfer. Set hand hole, inspection hole in the poor circulation of weak links, to facilitate regular inspection and maintenance. 5, the temperature of the boiler smoke box structure compared to dry wet back boiler back, greatly reduced, the smoke box solves the frequent need to maintain the operation of the phenomenon; 6, a large volume of water boiler design, the load fluctuation of furnace not sensitive to large changes in the load range of users still apply. 7, industrial boilers professional artists and designers carefully designed appearance, novel and unique and yet with the surrounding environment coordination. Sino-Swiss boiler completely changed the image of heavy industrial boilers, industrial boilers is a new concept of low-carbon twenty-first century. Construction and installation points: 1 explosion-proof door is provided on the fuel, the rear of the gas-fired boiler or pipe smoke, explosion door location should be conducive to explosion venting. For gas explosion likely to endanger the safety of the operator occasions, should be installed on the guide tube pressure relief blast doors. 2. Installation of boiler and its auxiliary equipment, water treatment equipment should meet the technical requirements of the device manufacturer. Equipment foundation must be the arrival of equipment and after verification and design drawings before construction. 3. When mounting the device, the device should be avoided, to install the floor material are collected together. Column using a construction, the beam lifting device, must first verify that the carrying capacity of the beam, the column. 4. After the pressure test acceptance oil, gas, water, steam pipe installation, according to "Industrial metallic pipeline construction and acceptance" in GB50235-1997. The main construction practices and node configuration detail see National Building Standard Design Atlas. 02R110 "Gas (oil) boiler room engineering design and construction Atlas" 02R111 "small vertical, horizontal tank Atlas" 02R112 "Tank dome Atlas"

How to prevent fired vertical hot water boiler 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.

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