By Mr.J 2019-11-12 08:32:44
With the continuous promotion of coordinated development of city clusters in key national regions, urbanization strategy and rural revitalization strategy, the degree of urbanization development in China has been gradually improved. In recent years, the scale of cities has been rapidly expanded, people's consumption level has been constantly improved, and garbage production has been increasing, and many cities have been surrounded by garbage.In the section of "accelerating the reform of ecological civilization system and building a beautiful China", the 19th National Congress of the Communist Party of China (CPC) listed the issue of garbage treatment as "prominent environmental problems", and clearly required "strengthening solid waste and garbage disposal", so as to form a space pattern, industrial structure, mode of production and way of life that can save resources and protect the environment.How to deal with waste reasonably and effectively has become the focus of environmental protection for the government and the public.At present, under the principle of waste disposal reduction, recycling and harmless, waste incineration power generation gradually shows great advantages and forms a competitive emerging industry, which has become an important development direction of waste disposal.
The frequent occurrence of major climate disasters in the world in 2012 is the result of mankind's increasingly profound understanding of the destructive effects of climate warming.Climate warming is caused by the uncontrolled use of fossil fuels by human beings, which increases the carbon dioxide content in the atmosphere year by year, strengthens the greenhouse effect and destroys the laws of atmospheric circulation.Now the world is exploring new energy sources to replace fossil energy and scientific ways of industrial production and application. Solar energy, wind energy and nuclear energy have been developed and utilized practically.However, the development and utilization technology of biomass industrial energy is just beginning and will last a long time.
Biomass energy comes from solar energy and CO2in the atmosphere. Plants absorb CO2and sunlight in the atmosphere during their growth and synthesize various organic substances, some of which are used by animals to form animal energy.When the organisms and their products are burned, they release energy and at the same time release the absorbed CO2into the atmosphere in equal amount.For the global atmosphere system, the CO2increment of this energy use to the atmosphere is zero, which is called carbon zero emission.There is a huge amount of biomass fuel on earth. If fully utilized, it will play an important role in reducing CO2emissions.The development, research and utilization of solid, liquid and gaseous fuels of plant straw are under development.
Many projects to increase the flue gas external circulation, according to the on-site reaction, the flue gas recirculated condensed water is a lot, in winter, the wind duct will even freeze.This is because the hot and humid smoke and combustion fresh air mixed, mixed steam beyond the mixed air temperature of the saturated humidity, the excess steam formed condensed water.CO2 in the flue gas will dissolve in the condensed water. If the acidic condensed water enters the burner or fan, it will easily corrode the components of the burner or fan.Measures must be taken to prevent condensation from entering the burner or fan.Add heat preservation for recirculating smoke pipe, reserve condensate water outlet, fresh air and preheat.
Condensate water discharge device shall be set at the lowest point of each section of the circulation flue. If there is a mixing bellows, condensate water discharge device shall be set on the mixing bellows. If necessary, condensate water discharge device may also be set on the fan.Condensate water discharge device recommended made of water seal type, the highest point of the water seal lower than the lowest point of the flue gas pipeline, for the convenience of condensate water discharge.
Fuel more intelligent control system, adopt international famous brand PLC as the core controller, according to different fuels, the choice of different control procedures, to realize the automatic ignition, automatic flame-out protection system, automatic adjustment, automatic wind load and coal proportion adjustment of oil and gas, combustion fault automatic monitoring alarm, can implement chain and equipment protection, at the same time, the control system can also be used with equipment integration for an organic whole, to realize automatic equipment operation parameters setting and burner operation parameters matching, improve overall equipment automatic control effect.
From the perspective of heat transfer calculation, the measures to reduce the smoke exhaust temperature are analyzed from the following aspects: increasing the heat exchange surface, improving the heat exchange efficiency of the heating surface, improving the heat exchange temperature difference by using a lower temperature source, and reducing the influence of corrosion on the heat exchange efficiency.As gas boiler host first meet the low nitrogen flame furnace volume and size requirements, the second host of convection heating surface is a main export in order to reduce the smoke temperature, general control in 150 ~ 250 ° C, in order to avoid the smoke temperature increases along with the flue design difficulty of heat preservation, high smoking temperature is too low will cause corrosion in furnace convection heating surface forming wall condensation, therefore, furnace domestic demand to design proper heating surface, the physical dimension more representative chamber size.Increasing the heat exchange surface should mainly consider increasing the heat exchange area of the equipment in the rear of the boiler, which is more favorable for rapidly reducing the exhaust temperature.The second is to have a lower inlet water temperature can be used for heat exchange temperature difference characteristics;Third, corrosion resistant materials can be used to improve its service life.The new structure of efficient heat exchange mainly adopts the form of staggered tube arrangement, efficient heat exchange finned tube, plate heat exchanger, etc., to increase the flue gas disturbance and contact surface, reduce the heat resistance of flue gas stratification, and improve the heat exchange efficiency of medium and flue gas.
Clean energy consumption and utilization is a systematic problem involving power supply, power grid and power load.At present, the consumption of clean energy in China is mainly faced with the following difficulties: first, the reverse distribution of resources and demand. Most of the landscape resources are distributed in the "three north" region, while the water energy resources are mainly concentrated in the southwest region, while the power load is mainly concentrated in the central, eastern and southern regions.Second, the rapid development of clean energy does not match the growth rate of electricity consumption in recent years. In recent years, with the active support of national policies, the installed capacity of clean energy, especially wind power and photovoltaic power generation, has maintained a fast growth rate, far exceeding the growth rate of electricity consumption of the whole society.Third, the processing of wind power and photovoltaic power generation is affected by natural conditions, and there are relatively large fluctuations. After large-scale grid connection, it brings great challenges to power system dispatching and operation.At present, China's power system is not fully adapted to such a large scale of volatile new energy access.