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Straw generator
Straw generator
Straw generator Straw is a good clean and renewable energy, including the stems, leaves and seed shells of various plants. It is one of the most potential new energy sources for development and utilization, and has good economic, ecological and social benefits. Straw power generation is a power generation method that uses crop straw as the main fuel. It is divided into straw gasification power generation and straw burning power generation. Straw generators are also supporting equipment for large agricultural processing projects such as vegetable oil plants, alcohol plants, and starch plants.
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Straw generator
Straw generator
Straw is a good clean and renewable energy, including the stems, leaves and seed shells of various plants. It is one of the most potential new energy sources for development and utilization, and has good economic, ecological and social benefits. Straw power generation is a power generation method that uses crop straw as the main fuel. It is divided into straw gasification power generation and straw burning power generation. Straw generators are also supporting equipment for large agricultural processing projects such as vegetable oil plants, alcohol plants, and starch plants.

Straw is a good clean and renewable energy, and it is one of the new energy sources with the most development and utilization potential. It has good economic, ecological and social benefits. In the process of biomass recycling, the emitted CO2 and biomass regeneration When the absorbed CO2 reaches the carbon balance, it has the effect of zero CO2 emission, and has potential contribution value to alleviate and ultimately solve the greenhouse effect problem.
Straw power generation is a power generation method that uses crop straw as the main fuel. It is divided into straw gasification power generation and straw burning power generation. Straw gasification for power generation is to burn straw in an oxygen-deficient state to cause a chemical reaction to generate high-grade, easy-to-transport, and highly efficient gas, and use the generated gas to generate electricity. However, the straw gasification power generation process is complicated and difficult to adapt to large-scale applications, and is mainly used for smaller-scale power generation projects. Direct combustion of straw for power generation is the only realistic way to achieve large-scale applications in the early 21st century.
Straw generator is one of the most important forms of optimized utilization of straw. With the promulgation of the "Renewable Energy Law" and "Renewable Energy Power Generation Price and Cost Sharing Management Trial Measures", straw power generation has attracted much attention, and straw power generation is showing a rapid growth trend. Straw is a good clean and renewable energy. The calorific value of every two tons of straw is equivalent to one ton of standard coal, and its average sulfur content is only 3.8‰, while the average sulfur content of coal is about 1%. In the process of regeneration and utilization of biomass, it will make an important contribution to alleviating and ultimately solving the problem of greenhouse effect.
Steam cycle

In the 20th century, the rapid development of fossil fuel power generation technology represented by coal has greatly increased the power generation efficiency, steam temperature and pressure of the entire power plant. For straw burning power generation equipment, great development has also been made. However, compared with coal-fired equipment, there is relatively little experience in the design and construction of straw burning power generation equipment. Moreover, straw also has unique characteristics, making it difficult to achieve higher steam parameters. Especially the high chloride content in straw increases the possibility of boiler corrosion under high steam pressure. The power generation efficiency of most straw burning power plants can only reach about 30%. Generally speaking, straw power plants provide heat while generating electricity to increase the efficiency of the entire power plant. All these problems have been resolved.
 
Combustion power generation
Build two independent straw warehouses in the power plant. Each warehouse has a gate, and the transport truck can be driven in through the gate, and then stop on the weighbridge to weigh, and the straw must be tested for moisture content. Any bale of straw with a moisture content of more than 25% is considered unqualified.
In power plants, this test is performed by infrared sensors installed on automatic cranes. In China, you can manually insert the detector into each straw bale to test the moisture. The detector can store 99 sets of measurement values. After measuring all the straw bales, the measurement results can be stored in a computer connected to the weighbridge. Then use a forklift to unload the cargo, and enter the empty weight of the transport truck into the computer. The computer can calculate the net weight of the straw based on the weight before and after and the water content.
When the truck is unloading, the forklift puts the straw bales into a predetermined position; at the other end of the warehouse, the forklift puts the straw bales on the feeding conveyor; the feeding conveyor has a buffer table that can keep the straw for 5 minutes; The straw is conveyed from the feeding table to the feeding system through a feeding conveyor with a sealed gate (fireproof); the straw bale is pushed onto two vertical screws, the straw is shredded by the rotation of the screw, and then the straw The rods are transferred to the screw automatic feeder, and the straws are pressed into the sealed feeding channel through the feeder, and then reach the hearth. The hearth is a water-cooled vibrating hearth, which is specially developed for straw burning power plants
Boiler system
The boiler adopts a natural circulation drum boiler, the superheater is arranged in the flue in two stages, and the economizer and air preheater are arranged at the end of the flue. Due to the relatively high content of alkali metals in straw ash, the flue gas is highly corrosive at high temperatures (above 450°C). In addition, the melting point of fly ash is relatively low, which is prone to slagging. If the ash becomes solid and semi-fluid, it will be difficult to remove during operation, which will hinder the heat transfer from flue gas to steam in the pipeline. In severe cases, it will even completely block the flue gas passage and block the flue gas in the boiler. Because of these problems, the superheater system was specially designed and used in most straw power plants in the world.
Operating system
Turbines and boilers must be consistent in starting, partial load, and shutdown operations. It is very important to coordinate the work of boilers, steam turbines and air condensers.
Power generation device
Steam turbine unit. A steam turbine, also called a steam turbine engine, is a rotary steam power device. High-temperature and high-pressure steam passes through a fixed nozzle to become an accelerated airflow and then sprays onto the blades, which rotates the rotor with blade rows while doing external work. Steam turbines are the main equipment of modern thermal power plants and are also used in the metallurgical industry, chemical industry, and ship power plants

According to steam parameters (pressure and temperature), the steam turbine of the cleaning system is divided into:
—— Low pressure steam turbine: the main steam pressure is less than 1.47Mpa;
—— Medium-pressure steam turbine: main steam pressure is 1.96—3.92Mpa;
——High-pressure steam turbine: the main steam pressure is 5.88-9.8Mpa;
—— Ultra-high pressure steam turbine: the main steam pressure is 11.77-13.93Mpa;
—— Subcritical pressure steam turbine: the main steam pressure is 15.69-17.65Mpa;
—— Supercritical pressure steam turbine: the main steam pressure is greater than 22.15Mpa;
—— Ultra-supercritical pressure steam turbine: main steam pressure is greater than 32Mpa;
 
Cleaning system
After the wet flue gas purification system, install a bag filter to collect the fly ash in the flue gas. The discharge of the bag filter is less than 25mg/Nm. The bag filter is a pulse jet type, and the container is cleaned by a pulse of compressed air.
by-product
Straw usually contains 3-5% ash. This ash is collected in the form of boiler fly ash and slag/bottom ash. This ash is rich in nutrients such as potassium, magnesium, phosphorus and calcium, and can be used as a highly efficient agricultural fertilizer.

Main advantage
Straw has been considered as the green renewable energy with the largest scale of development and utilization among new energy sources. The promotion of straw power generation will be of great significance:
1. Large amount of crop stalks, wide coverage and sufficient fuel sources.
2. The sulphur content of straw is very low. The relevant research of the International Energy Agency shows that the average sulfur content of straw is only 3.8 parts per thousand, while the average sulfur content of coal is about 1%. And the low-temperature combustion produces less nitrogen oxides, so the flue gas after dust removal is not desulfurized, and the flue gas can be directly discharged into the atmosphere through the chimney. The national operation test shows that the flue gas after dust removal of the straw boiler can fully meet the environmental protection requirements without other purification measures. Therefore, straw power generation not only has good economic benefits, but also good ecological and social benefits.
3. The calorific value of straws of various crops is slightly different, but the calorific value of straws is about 15000KJ/Kg, which is equivalent to 50% of standard coal. Among them, the calorific value of wheat straw and corn straw is the smallest among crop straws, and the low calorific value is 14.4 MJ/kg, which is equivalent to 0.492 kg of standard coal. Using straw to generate electricity can reduce coal consumption.
4. Straw stalks usually contain 3%~5% ash. This ash is collected in the form of boiler fly ash and slag/bottom ash. It is rich in nutrients such as potassium, magnesium, phosphorus and calcium, and can be used for high efficiency. Agricultural fertilizer.
5. As a fuel, coal mining has certain dangers, especially mine mining, which is difficult to manage. Compared with crop straw, it is less dangerous, easy to manage, and belongs to waste utilization.
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