Design and Implementation of Automatic Combustion Control System for Waste Incinerator

Design and Implementation of Automatic Combustion Control System for Waste Incinerator
In recent years, the size of the city and the resident population have been expanding and increasing, and accordingly more and more urban domestic garbage has been generated. From the perspective of urban development, how to deal with urban domestic garbage is an urgent problem to be solved. With regard to the treatment of municipal domestic waste, most of them are landfilled, incinerated and composted. The treatment effect of incinerated waste is very obvious. With the help of waste incineration power generation, it can also reflect the advantages of green, environmental protection and high efficiency.
1、 Basic overview of combustion automatic control system of grate type waste incineration power plant.
1. Understanding of grate furnace waste incineration.
Grate incinerator waste incineration is a waste incineration technology. Grate incinerator has various forms and uses, accounting for more than 80% of the world waste incineration power generation market. Its most obvious advantages are mature technology, stable operation, safe and reliable, less harmful gas emissions, strong adaptability, and is conducive to large-scale centralized treatment of garbage. Before incineration, most garbage can be directly incinerated without pretreatment, and the operation is convenient. However, grate furnace waste incineration also has the problem of high water content of sludge and large domestic waste can not be directly incinerated.
2. Principle of automatic combustion control: The automatic combustion control system is aimed at the current situation of the traditional combustion mode of manual ignition operation, poor production conditions, high labor intensity, poor safety, frequent casualties, lack of accident detection and early warning, real-time monitoring of combustion, and the ability to deal with abnormal phenomena. It has developed and designed a fully automatic combustion control system, which can effectively improve the reliability and safety of incineration and power generation, Achieve product quality and economic benefits. The main purpose of the automatic combustion control system is to ensure the stable combustion of garbage, and realize the automatic control and operation of garbage combustion such as feeding, air inlet and turnover frequency; Steam flow is an important parameter reflecting the operation status of combustion automatic control system.
2、 Current situation of waste incineration power generation.
So far, with the development of domestic waste treatment projects in China, according to statistics, the amount of waste produced in our people's daily life is about 10000 tons. The emergence of this situation will bring more severe challenges to the original municipal waste treatment system. Incineration has become one of the more common treatment methods in the current stage of waste treatment.
At present, China's domestic waste incineration power generation has been carried out for many years. Domestic waste incineration workers have explored a set of waste disposal modes suitable for China's national conditions, and constructed corresponding incineration equipment components according to the characteristics of waste incineration treatment. However, due to the late development of waste incineration technology in China, there are still some problems in the actual operation of incineration equipment.
3、 Design index of automatic combustion control system.
The combustion system of the waste incinerator should be controlled stably to avoid boiler shutdown due to improper operation. Therefore, the combustion control objectives of the incinerator are to maintain stable combustion, stable steam flow, continuous high temperature in the furnace, and the emission of atmospheric pollutants below the limit value to reach the design value of the heat intensity.
4、 Automatic combustion control strategy.
1 Sensitivity analysis of combustion control.
During the operation of the incineration system, due to the complex composition of waste and the long time from feeding to fuel combustion, the variable adjustment of the combustion system needs a certain degree of freedom to better conform to the characteristics of waste incineration. Therefore, it is necessary to focus on the maintenance of the measuring instruments of various variables related to the system, improve the calibration frequency, and ensure the normal operation of the instruments.
2. Waste promotion control.
The automatic combustion control system is based on the steam flow, calculates the gas supply through the calorific value, and accurately feeds the fuel through the control of the hydraulic system. The calorific value calculation in the feeding process is an important factor to ensure the combustion stability; At the same time, the automatic combustion control system should record the calorific value to ensure the feeding accuracy. In this process, it is necessary to ensure that the garbage is evenly laid on the grate and effectively turned over to achieve continuous and full combustion.
Automatic control of the incineration process in the incinerator can improve the accuracy, stability and working efficiency of the incineration quality, change the traditional manual operation mode, and reduce the injury to people caused by accidents. At the same time, according to the actual situation in various places, the grate incinerator can be appropriately improved to improve the efficiency of the grate incinerator, and promote the development of the waste incineration power generation industry, Create a cleaner living environment for mankind.

——Author：EBICO