The first type is the bare pipe water wall. This is the simplest structure of the water wall. The advantage is that ordinary seamless steel pipes can be used, and it is more convenient to replace the water wall pipe. The disadvantage is that the temperature of the furnace wall is still high, and heavy refractory bricks are required. The steel frame of the corresponding boiler should be strengthened. , The air leakage of the furnace wall is relatively large. Old-fashioned high-pressure boilers and medium and small boilers are used more frequently.
The second tupe is the membrane water wall. The membrane water wall is welded by seamless steel tubes with fins. The Water Wall Tubes are connected by fins to make the water wall into a whole. This kind of water wall is called a membrane water wall. Its function is to strengthen the heat transfer of the water wall and greatly reduce the temperature of the furnace wall. The furnace wall does not need refractory bricks, but only requires thermal insulation materials. Compared with the conventional heavy furnace wall, the weight can be reduced by 60% ~ 70%, the furnace wall heat storage is reduced by 80%, the start and stop time is shortened, and the fuel consumption is reduced. The load of the furnace steel frame is greatly reduced, saving refractory materials and steel.
The third type is the pierced pipe water wall. The barbed pipe water wall pipe is made by welding many grab nails with a length of 20 to 26 mm and a diameter of 6 to 12 mm on the water wall pipe. It is mainly used to lay the gas belt. Generally, for boilers that burn fuel with low calorific value and low volatile content, in order to stabilize the fire, pierced pipe water walls are often used for laying the fire protection belt.
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PwC's latest Financial Review of the Global Automotive Industry pointed out that in the next four years, while several mature automotive markets in the world will continue to grow, the largest breakthrough growth will come from four emerging economies: China , Brazil, Russia, and India, which will account for more than 40% of total global light vehicle production growth, and account for 52% of the industry's global projected capacity growth. China is expected to surpass Germany this year to become the world’s third largest automobile producer after the United States and Japan.
At the fifth annual meeting of the Chinese automotive industry development held on the 5th, Zhang Zhengzhi, deputy chief engineer of the China Automotive Technology and Research Center, said that from the beginning of the "Eighth Five-Year Plan" to the end of the "Tenth Five-Year Plan", China's private cars will be owned for fifteen years. The proportion of vehicle ownership has increased from 15.8% to 58.5%.
In 2006, China’s auto market will surpass Japan, ranking second in the world. Around 2012, China's auto market will exceed 10 million. After 2020, China's auto market may exceed 20 million vehicles to become the world's largest auto consumption market. 
The boiler water wall is the main radiation heat surface, arranged inside the boiler chamber and proceeds the heat exchange directly with the high temperature flame. The convection tubes are the convection heat surface of the boiler, arranged between the boiler chamber outlet and the end heat surface and proceed the heat exchange directly with the high temperature fume. The water wall and convection tubes are the main heat surface of the boiler, the tubes diameter for both generally usedΦ 51-60mm boiler steel tubes, also as the request.