《燃气锅炉安全保护装置故障分析（）》由会员分享，可在线阅读，更多相关《燃气锅炉安全保护装置故障分析（）（6页珍藏版）》请在金锄头文库上搜索。
1、燃气锅炉安全保护装置故障分析()Safety analysis of a gas furnace (using the advantages of gas-fired boiler heating)1. alarm device for high water level and low water levelHigh water level and low water level alarm interlock protection: beeps in the drum water level is too high or too low, to remind the stoker boile
2、r, program controller display high level or low level When the high water level of boiler can automatically discharge, and cut off the boiler water pump power, the water level control in a safe area; automatic start-up boiler water pump for water when the water level is low, until the normal high wa
3、ter level so far This precise automatic control requires that the protection device be sensitive and reliable There are three kinds of water level sensors commonly used in gas-fired boilers: floating ball type, magnet type and electrode type My unit level sensor safety device in the electrode, the s
4、ensing element electrode due to Iong-term contact with high temperature water or steam, electrochemical corrosion, fouling due to conductivity of electrode end can be destroyed; or the insulation between the electrode and the water column shell aging makes the signal circuit short circuit or electri
5、cal circuit due to the high temperature; to break or bad contact These factors result in malfunction or malfunction of the water level sensor2. overpressure protection device for boiler2 pressure controllers are installed on the steam boiler of our unit: the 1# pressure controller is a super pressur
6、e controller, dnd the 2# pressure controller is the normal working pressure controller The overpressure controller is used to protect the boiler from overpressure operation. It is the use of the corrugated tube elastic element with the pressure of lifting and elongation or shortening the variation c
7、haracteristics of the lever and the shifting arm through the toggle switch, the contact switch is open or closed, so as to achieve the purpose of pressure control. Its bellows, elastic components, electrical contacts, springs and other components are easy to damage, and if it is not found in time, i
8、t can not play the role of overpressure protection3. furnace safety protection deviceThe burner adopts the Nu-Way (force) burner imported from England, and its characteristic is that it can meet the working requirement under the condition of low pressure air supply (10 300imnbar) The program control
9、ler is very fine, with high pressure protection, low pressure protection, pressure leakage detecting device, safety device and leak detection program controller, automatic detection of gas valve (gas emergency shut-off valve, fire electromagnetic valve etc.) close solenoid valve and gas valve sealin
10、g tips But the ignition control program and flameout protection program dependent electric eye CDS (flame) composed of an ultraviolet photoelectric tube and flame monitoring integrated circuit board, the electronic components are often used to monitor the flame failure prone to aging lose effect, an
11、d once they are in danger of losing the role of furnace explosionTwo sensitivity test of safety protection device1. high water level and low water level alarm device connected to the sensitivity test of water level sensor and liquid level meter. In the first step, the water valve is closed in 5, whe
12、n the sensor, liquid level meter and close the water between the water level of drum space, slowly open the drain valve 4 and observe the level meter drop, low water level reaches the lowlevel lightthe device can observe the alarm and limit the low water level interlock protection device is started.
13、 At this time, the boiler program controller operates the emergency shutdown, while the boiler feed pump power is also cut off. The second step, to restore the boiler feed pump automatic operation,Close the water level gauge cock, open the drain valve 4, the use of steam washing inside the sensor, a
14、nd then close the valve 6, and then close the drain valve 4, slowly open the water inlet valve 5, the sensor using the drum pressure, then open the water level gauge cock which is connected with the sensor, liquid level meter to observe the water level reaches the high water leve1. Automatically sto
15、p the pump and the high water level alarm is norma 1. The third step, turn on the steam valve 6, fully open the water valve 5, again open the drain valve 4, flush the sensor after a few seconds, turn off the drain valve 4, so that the whole set of equipment to return to normaL2. sensitivity detectio
16、n of boiler overpressure interlock protection device, short connection of 2# pressure controller signal line, then start boiler.The first step is to test the safety valve first. The pressure controller to manually adjust the pressure, which is higher than that of the safety valve opening pressure of about 0. 2MPa in nonnal combustion boiler, the boiler room fireman slowly closed the main inlet valve sub cylinder, the boiler pressure, drum pressure bega
