Hot alkaline recycling device of calcining furnace

Abstract

The invention relates to a hot alkaline recycling device of a calcining furnace and a using method of the device. The hot alkaline recycling device comprises a feeding tower, conveying machines, the calcining furnace, fuel gas, a preheater, an air compressor, a preheating fan, a fluidization fan, a stage separation device, washers, an electrostatic dust collector, a decontamination fan and an ash hopper. The stage separation device comprises a first-stage stage separation part, wherein a stage separation channel of the first-stage stage separation part is communicated with a top gas outlet of the calcining furnace, is further connected with the washers and is communicated with the calcining furnace; and the washers, a tray washer and a wet type electrostatic dust collector are sequentially communicated.

Description

technical field [0001] The invention relates to an alkali recovery equipment and a process thereof, in particular to an alkali recovery equipment. Background technique [0002] Soda ash is the main industrial raw material. Building materials, glass, metallurgy, transportation and other industries are closely related to soda ash. In recent years, the domestic soda ash industry has developed very rapidly. 2000 (25 million) tons / year. In the main process of soda ash manufacturing, wet heavy alkali (NaHCO 3 +H 2 0) is calcined into soda ash, and the process is mostly completed by rotary calciner in China. The calciner is heated by steam, and the treatment of the tail gas discharged from the furnace is a hot topic in the soda ash industry in recent years. [0003] The soda industry generally uses a rotary calciner, which processes wet heavy alkali, and the composition of wet heavy alkali and other types of alkali is shown in Table 1-4. After a series of physical and chemica...

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Problems solved by technology

The gas discharged from the calciner contains a mixture of sodium carbonate and sodium bicarbonate, and after passing through the primary cyclone dust collector, there are still about 8000~20000mg / m 3 dust content, the tail gas volume of the calciner is generally 35000 ~ 42000m3 3 / h, the amount of dust is 8000mg / m 3 ×35000m 3 / h=280kg / h, that is, each furnace has 280kg of finished alkali per hour dissolved and washed away by the water in the cooling tower. Generally, a soda ash plant with an annual output of 600,000 tons / year is equipped with four calciners of the same specification. About 24 × 300 × 4 × 280 = 8064 tons of soda ash are discharged every year. According to the current price of soda ash at 1500 yuan / t, and the estimated value of recycled alkali is 1000 yuan / t, then there will be sodium carbonate and carbonate worth 8.064 million yuan per year Sodium hydrogen is discharged into wastewater, which wastes resources and pollutes the environment

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