mini coal fired steam boiler

ZG is in the forefront of the domestic research on energy saving circulating fluidized bed boiler, ZG with a boiler manufacturing license, "ASME S", "ASME U" stamp, is a large state-owned enterprise, after 70 years of development, in the national and international scope to establish a good brand image, with annual production of power plant boiler, industrial boiler (coal, oil and gas, biomass), 12000 tons of waste heat mini coal fired steam boilers, pressure vessel,more than 16000 tons of metal and other 9 series more than 200 varieties of production capacity.

Today, the principle of mini coal fired steam boiler and the construction of steam boiler too many forms, take an ordinary fast-packed 4-ton steam boiler. Water is heated into steam in the drum and heat is emitted by fire in the furnace, which is the principle of the steam boiler. Say the boiler first the pot. The boiler is a drum boiler with water cooling. Two return pyrotechnic tubes are arranged in the left and right parts of the drum, and the front cigarette box in the front part of the drum is turned back. Between the drum and the bottom box, there is a drop tube and a water-cooled tube, forming the frame of the combustion chamber. There is a steam separator on the top of the drum to reduce the water produced by steam. The heating surface of the boiler body is the lower part of the drum, the water-cooled pipe and the Pyrotechnic pipe The combustion part is composed of a chain grate and a drive device, and a combustion chamber composed of a boiler rack on the grate frame. Surrounded by refractories. Coal from coal hopper, there are coal gate to control the thickness of coal seam while sealing the front of the air. The lower part of the combustion chamber is the place where the blast enters, and this kind of boiler has great resistance and needs forced blast. Cinder, discharged from the back of the grate through hawk iron and sent out of the furnace by the slag extractor. From the back of the boiler, the flue gas goes forward from the first return pipe of the boiler, the second return pipe returns to the rear part of the boiler, and then goes into the dust collector to separate the ash, and then through the draught fan, it is discharged from the chimney. The induced draft fan not only discharges smoke, but also It is necessary for the negative pressure operation of the boiler. Essential water level gauges, pressure gauges, safety valves, thermometers, electric pumps that can replenish water under pressure, and steam pumps that can also be used in the event of power outages. Boiler water must be softened and water treatment equipment. Steam boilers are force vessels and safety devices are necessary. All steam boilers can work better only in accordance with the correct operating methods.

Shutdown four tons of gas boiler mini coal fired steam boiler shutdown and maintenance of fire into pressure shutdown, normal shutdown, emergency shutdown. A pressure fire fire shutdown shutdown pressure applied to temporarily stop the supply of steam, the boiler is shutdown pressure hot standby state. 1, before the pressure reduction appropriately to fire the boiler load, and according to the length of the seam thicker shutdown time, (up to 200mm) to accelerate the speed of the grate, the grate is stopped when rotated about 1.5 meters from the coal seam to the shutter. 2, stop blowers, blower suitably adjusted flap subsections, relying on a lean-burn natural ventilation is maintained. 3, the sewage, to allow the water level in the boiler water level. 4, Yang fire regularly, to prevent rotation of the furnace grate extinguish the fire bed. Young fire first before sewage water, then rinse water level gauge. II. Normal shutdown Normal shutdown for heating period ends, boiler pour fire into the buck repair or maintenance. 1, make a record before shutdown problems in operation, so that after the shutdown process. 2, the coal bucket coal memory runs out, the amount of toner to reduce the wind. 3. Stop the blower, draft fan stop and then the opened door grate ash. 4, after the steam supply is stopped out, the boiler to the boiler water to maintain a high level. 5, close the main steam valve, if the pressure rises to open the air exhaust valve suitable pressure relief. 6, stop the water supply to the boiler and economizer attention to monitoring changes in water temperature, open return pipe if necessary. 7, 4 to 6 hours after the furnace fire bed down exhausted, continued rotation of the cooling grate. Throughout the boiler throttle, the door should be kept closed. Allowed to naturally cool. 8, appropriate to open the pump, the boiler water and sewage. When the pressure drops to zero, open the air valve. 9, when the boiler water temperature is below 70 ℃, boiler water can be exhausted. Shutdown is complete. 10, less than 24 hours during shutdown. Avoid Shutdown cooling process, step-down too fast. Third, emergency shutdown emergency shutdown applies to the boiler accident, g combustion equipment damage, furnace or boiler structure collapsed wall is red-hot, a serious threat to the safe operation of the boiler when; h boiler pressure parts found serious distortion, leakage. when i found flue gas explosion or secondary combustion, boiler and seriously endanger the safety of operating personnel;; when endanger the safety of operation.. the safe operation of the boiler j endanger other unusual circumstances when. 2, the emergency shutdown procedures to immediately stop a blowing coal and reduce the wind; B rotates quickly grate, the pour slag pit coal or sand, wet ash coal burning fire to extinguish. , but not to the firebox water;. c boiler air valve, the relief valve opens quickly exhaust the steam pressure is reduced;. d after the fire goes out, stopping fan, opening the ash door and door, promote air circulation accelerated cooling; 3, emergency shutdown Notes a. when an accident and emergency shutdown due to lack of water, boiler feed water is strictly prohibited to, and shall not be such as to open the air valve or exhaust valve work on preventing boiler from sudden changes in temperature or pressure to expand accidents;. b when filled with water due to an accident and emergency shutdown, should immediately stop the water supply, reduce combustion, open the drain valve and drain, due to lower the water level, while opening the main steam pipe, the sub-cylinder and steam traps mother tube, water and prevent steam pipe with a large number of water hammer occurs. c. emergency shutdown operation to ensure the safety of the main event of an accident to calmly deal with, timely reporting, and make relevant records in the "log table boiler." d. Whether shutdown any case, we must maintain timely contact with steam departments.

Around at 10:12 on February 28, 2019, Zhangjiakou City Chabei Management District Kai Austrian Energy Management Services Ltd. Taiwan 15 tons of steam biomass boiler drum due to the control zone tearing a serious accident, killing three people the death of four people were injured.

Currently seven injured in hospital emergency treatment, cause of the accident is still under investigation, rehabilitation disposal is also an orderly manner.

Heartbreak is that similar incidents happened from the last time, only 28 days.

At 15:30 on January 2019 May 2009 55 points, Zhangjiakou City Hall Ltd. Hong Mei generating boiler scalding accident, three people were killed and one injured.

Boiler special equipment is clearly defined our country, whether it is manufacturing, purchase, installation, operation or maintenance, have strict operating guidelines. Now many have adopted new boiler intelligent control, operational safety compared to conventional boilers, more convenient; but that does not mean foolproof, vigilant and master the correct method of application, in order to minimize accidents frequency. After all, the cost of each accident are living lives.

Recalling these events boiler explosion

March 3, 2014, Xingtai City, Hebei Province, a steam boiler explosion. Boiler plant razed to the ground, surrounded by multi-family residential buildings, factories affected by the explosion were destroyed. According to the injured introduction, cause of the accident may be due to faulty boiler and pressure control instruments not work, the pressure continues to rise, leading to an explosion.

November 15, 2014, Wangcun Daiyue located in Tai'an City, congee shop offices under Daiyue Xiaoxiang Court Food Co. boiler explosion accident caused part of the building collapsed, the scene four different degrees of harm employees .

About 5 minutes, packaging wood factory near Jincheng territory of Huai'an City, Jiangsu Province, south of the village of Hope Town boiler explosion occurred at 9:00 on January 24, 2016.

February 28, 2016, after the city of Hebi in Henan Province Junxian Pi Mao Shan Street office building energy source of the village cents Ltd. boiler explosion occurred, resulting in many injuries and death.

May 12, 2016, hurt Fengxian Plastics Corporation boiler explosion occurred, resulting in many casualties.

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