The combustion mode of China's coal-fired industrial boilers is mainly based on layer-burning furnaces, while the chain furnaces in the layer-burning furnaces dominate. Due to the large variety of coal used in industrial boilers in China, the changes are large and the quality is poor. Each boiler has only one type of coal that is most suitable, that is, the design of coal. Therefore, it is necessary to carry out boilers due to coal, furnace and local conditions. Technical transformation, so as to meet the purpose of ensuring production, keeping warm, safe and economical operation, saving energy, eliminating smoke and dust, and protecting the environment. Specifically, the following five requirements are met.
Boiler renovation requirements
1. Improve combustion and improve boiler thermal efficiency
For the stratified furnace, the exhaust loss Q2 and the mechanical incomplete combustion loss. It is the two largest heat loss, so it is necessary to take targeted improvement and combustion adjustment measures to improve thermal efficiency, reduce heat loss and improve furnace combustion according to coal type and sputum type.
2. Guaranteed output or increased output
If the enterprise needs to increase its output, it is necessary to increase the heating surface appropriately, increase the water wall in the original furnace or increase the convection heating surface in the flue, rebuild the furnace arch, and re-arrange the furnace.
3. Improve mechanization and automation, improve working conditions
Improve the combustion mode s to improve the way of coal transportation, coal feeding, slag removal s automatic water supply device, high water level automatic control and signal device response computer control management to improve working conditions and improve management.
4. Eliminate smoke and dust, protect the environment
Improve or adopt a new type of dust collector, use low-sulfur coal or install desulfurization equipment to treat slag removal and desulfurization wastewater, reduce equipment noise, prevent disturbances, etc. Reduce the pollution of boiler emissions to the environment.
5. Improve the safety performance of the boiler
Improve the water supply situation, increase or replace the new water treatment equipment, deoxidation equipment, improve the unreasonable structure in the design and manufacture, and make the pot safe and economical.
Selection of energy-saving retrofit scheme for industrial boilers
Basic requirements for the design
The transformation of the boiler requires a correct and scientific design, and the following requirements must be met.
(1) Safe and have a certain service life.
(2) Economy and save fuel and electric energy, improve thermal efficiency, and meet production requirements.
(3) Try to adopt new technologies and new processes.
(4) Civilized and hygienic, with a good environment and the effect of eliminating dust and dust, the emission of soot and ash should comply with the national environmental protection standards.
(5) Reasonable, to eliminate the unreasonable or imperfect factors in the design and manufacture of the original boiler. (6) The newly heated surface should meet the safety requirements and be safe and reliable through water circulation accounting.
(7) Improve the degree of mechanical automation and improve working conditions.
Basic principles and procedures for programme selection
The difference between scheme selection and scheme evaluation is that the latter is the evaluation of the technical feasibility and economic rationality of a scheme, while the former is to achieve the optimal scheme of the selected scheme, and the alternatives are made before the selection. Comparison of the schemes, after comprehensive consideration of both technical and economic aspects, then determine the trade-off. Therefore, the basis of the program selection is the evaluation of the program. Only the evaluation options are available. After all the evaluation indicators have quantitative data, the selection of the program can achieve the best results. In fact, the choice of schemes is very complicated. Different schemes often have their own advantages and disadvantages. When making decisions, they should combine the actual situation of the unit to grasp the main contradictions and solve the key problems and complete the choice.
Before the plan is selected, the running equipment must be evaluated accordingly. The boiler evaluation is a complicated
The working process generally includes conducting necessary investigations on the historical status of the boiler, consulting the relevant design data of the boiler unit, asking the professional department to conduct performance tests, and then conducting data comparison analysis to find the problem and determine the cause of the problem, making a transformation or Improvement measures, after the implementation of the measures, re-examination tests to determine the effect of the transformation and to prove the correctness of the initial evaluation.
Study the specific transformation project or content within the direction of the transformation determined by the evaluation
Only after the boiler transformation project has been determined according to the above process, can we make multiple technical solutions for each project and then select the most suitable one.
