Online anti-blocking monitor system for economizer ash conveying system

Abstract

The invention discloses an online anti-blocking monitor system for an economizer ash conveying system. A pneumatic pipeline (valve) and an ash conveying pipeline are included in the ash conveying system. Bin pumps are arranged on the ash conveying pipeline through pipelines and are connected with automatic discharging valves. An expansion joint is connected to each automatic discharging valve. Each expansion joint is connected with an economizer ash bucket through a manual discharging valve. A temperature measurement thermal resistor for measuring the temperature of ash in the corresponding bin pump is additionally mounted at the shoulder position of each bin pump. The measured ash temperature is stored in a unit DCS control system through a DCS system connecting signal cable and a DCS clamp part, relevant logical configuration is carried out, the temperature is input into a CRT image of a monitor computer so that operation personnel can monitor the temperature change of the ash, and then the feeding and conveying conditions of the bin pumps are judged through the ash temperature change tendency; and when the temperature changes abnormally, it shows that material feeding and discharging of the bin pumps are not balanced, the ash blocking condition happens, the operation personnel are reminded of in-site checking, the ash blocking judgment accuracy is improved, the maintaining time is shortened, and the maintenance amount and environment pollution during maintenance are reduced.

Description

technical field [0001] The invention relates to a coal economizer used in a thermal power plant, in particular to an online anti-blocking monitoring system for an ash conveying system of the economizer. Background technique [0002] The monitoring of the economizer pneumatic ash conveying system currently used in thermal power plants is as follows: figure 1 As shown, it is composed of economizer ash hopper 1, manual unloading valve 2, expansion joint 3, automatic unloading valve 4, warehouse pump 5, pneumatic pipeline (valve) 9, ash conveying pipeline 10, pressure transmitter 11 and The pressure connection signal cable 12 required by the DCS system, the DCS access card 13, and the monitoring computer 14 are composed. When the boiler flue gas passes through the economizer ash hopper 1, the flow direction of the flue gas is changed, and the large particle fly ash falls into the economizer ash hopper 1 through centrifugal force. The collected large particle fly ash is controll...

AI Technical Summary

Problems solved by technology

[0004] 1. Due to factors such as changes in coal quality or improper personnel adjustments, coking and ash accumulation in the flue will result. In order to ensure the cleanliness of the tail flue pipe, increase the heat transfer effect, and improve the efficiency of the boiler, the flue will be blown soot from time to time. This causes fly ash to contain larger coke particles, coke blocks or foreign matter, which are collected in the ash hopper of the economizer, and larger coke particles, coke blocks or foreign matter enter the ash conveying bin pump unit and ash conveying pipeline, easily causing the Blockage at the bottom of the pump or in the ash pipe

[0005] 2. Since the ash conveying system of the economizer is generally composed of multiple ash conveying bin pump units, when any ash conveying chamber pump unit conveys ash and blocks ash, the pressure monitoring system cannot find the specific ash conveying chamber pump unit. Personnel cannot find out in time, resulting in a large amount of dust accumulation in the ash hopper of this unit, which affects the safety of the ash hopper

[0006] 3. The ash conveying pipeline pressure measuring point of the economizer is abnormal or the device is faulty, resulting in inaccurate measurement instructions, and the operator cannot judge the ash conveying condition, and cannot find out and deal with it in time, resulting in the blockage of the ash conveying pipeline system

[0007] Ash blockage in the ash conveying system cannot be detected in time, which will affect the stability and reliability of the ash conveying system, increase the amount of maintenance; increase the wear and tear of downstream equipment; and increase the risk of collapse of the ash hopper of the economizer

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