Problems in incineration of garbage power generation, high temperature corrosion; combustion stability and complete combustion; pollutant discharge; on-grid electricity price is high. Compared with the main unit of the power grid, the coal-fired thermal power unit has a smaller capacity. Only the Internet can help the stable operation of small units. However, at present, the efficiency of China's incineration of garbage power generation units is too low, and the electricity price is too high, which can reach 23 times the electricity price of coal-fired units. From the perspective of economic efficiency, incineration of garbage generator sets is not competitive. Considering that the incineration of waste has good environmental and social benefits, incineration of waste-to-energy can be supported by local governments and power companies. However, at present, China has the conditions to build cities and regions that burn garbage power stations. The power shortage problem is not as serious as it was a few years ago. The main tasks of the power industry are: gradually shut down small units to improve the power supply structure; Separate from the plant network to promote the competitiveness of the entire power system. Characteristics of incineration garbage heating mode:
(1) Avoid high temperature corrosion. If a saturated steam of 0.8 MPa is used for heating, the steam temperature is 170, and the saturated steam of 1.2 MPa is used for heating, and the steam temperature is 190. At this time, the metal wall temperature can be controlled to not exceed 300. If hot water is used for heating, the wall temperature of the metal pipe will be lower. Does not cause high temperature corrosion of sulfur, chlorine and its compounds.
(2) The air is preheated to a higher temperature. In the power generation mode, in order to ensure the generation of superheated steam with higher temperature and pressure, the heating surface of the waste heat boiler is usually arranged: in the direction of the flow of the flue gas and the direction of the decrease of the flue temperature, the water wall tube superheater convection tube bundle is arranged in order to save coal. The air preheater, so the temperature of the air preheating is usually lower, below 250, mostly below 200. If there is a CAO system, the air is only preheated by the wall crevice, and the air temperature is not expected to exceed 120. In the heating mode, the heating surface of the waste heat boiler can be arranged as: air preheater water wall tube convection tube bundle economizer. This allows the air to be preheated to a higher temperature, usually up to 350-400, and if necessary, to an air temperature of 450-500.
(3) Flexible adaptation. The flexible adaptability of incineration waste heat supply is as follows: its scale can be smaller than the scale of incineration waste power generation, and the supply of garbage is reduced. Therefore, it is suitable for both large cities and small and medium cities. Investment costs are low, and even cities and regions with underdeveloped economies can afford it. Incineration of garbage to generate electricity requires high pressure and temperature of steam. Therefore, it is required that the garbage has a high calorific value, and the incineration of the garbage to supply heat has lower parameters of the heat medium. Therefore, the calorific value of the garbage can be lower, as long as It can meet the calorific value required for incineration. There is no problem of generating electricity online. In the summer, when the heating supply is greatly reduced, the recovered waste heat can be used as a heat source for the refrigeration unit.
The environment in which the pollutant forming layer is burned in the furnace is easy to form a low temperature, humid, and anoxic environment, which is conducive to the formation of hot air at a higher temperature and is favorable for formation. High temperature corrosion condition of the working condition The temperature of the superheater tube wall is high, and it is easy to be corroded by high temperature. The temperature of the metal wall of each heating surface is lower, which can avoid high temperature corrosion. The daily processing waste amount is 3001000t-50500t. The investment is larger and the economically developed large city is less suitable. The metropolitan areas of large cities and small and medium-sized cities with underdeveloped economy can be concluded by comprehensively comparing the two modes of waste-to-energy generation and heating: First, incineration of waste-to-energy requires high calorific value and more supply of waste. Currently, Only large cities with developed economies can meet this requirement. Therefore, to build an incineration waste power station, we must first study the local calorific value and output well and avoid blind actions. Second, whether it is a large city or a small or medium-sized city, there are problems such as excessive waste dumping, encroachment on land, pollution of surrounding environment and groundwater source. Incineration of garbage heating provides an effective way to dispose of garbage for small and medium-sized cities and large urban communities.
Natural Latex Tube,Latex Rubber Tube,Colorful Resistance Rope,Latex Resistance Rope
Changzhou Golden Oak Rubber Plastic Polymer Co.,Ltd , https://www.jnsatee.com