SU1320172A1 - Method of processing gypsum-containing raw material to sulfur dioxide and lime - Google Patents

Abstract

The invention can be used for the disposal of waste production in the form of phosphogypsum, borogipsa, etc. to produce sulfur dioxide and lime. The purpose of the invention is to stabilize the concentration of sulfur dioxide and lower the temperature of the thermal processing process of the hypersolving materials. Borogips or phospho-gypsum is burned with fuel. The process temperature is 980-1025 C. The fuel is divided into two streams. The first stream of fuel is burned in an exhausting furnace with an air-fuel ratio of 20-32 kg of air per 1 kg of fuel. The second stream is burned before being fed into the reactor when mixed with dust from the return cyclone and air in a ratio of 3-5 kg of air per 1 kg of fuel. The ratio of the first and second streams of fuel support 0,64-0,73. The result is roasting gas with a consistently set content of sulfur dioxide (9.5-10%) and a significant decrease in process temperature. 1 3.p. f-ly. - I L

Description

113201722

This invention relates to the methods of Example 2. The thermal decomposition rate of a gypsum-containing reactor is 467.6. kg / h of phosphoglop. Dark materials, such as phosphogypsum, are peredatura process 980 C. In the external borogips, and can be used, the furnace burns 55 kg / h of mazut with chemical production and air flow of 1760 kg / h (32 kg of air per 1 kg of fuel). Another part of the fuel oil (86.1 kg) is combusted with dust from the return cyclone and air in the amount of 4 kg of air per 1 kg 10

construction materials.

The purpose of the invention is to stabilize the concentration of sulfur dioxide in the gas phase and lower the process temperature.

The method is carried out as follows.

Pre-dried gypsum-containing raw material is fed to the thermal decomposition into the reactor. The fuel required for its combustion is divided into two streams with a ratio of the first to the second 0.64-0.73. The first flow is burned in a remote furnace at a mass ratio of air to fuel (20 mazut. The ratio of fuel flows is 0.64. The content of sulfur dioxide in the gas phase at the outlet of the reactor is 9.52%.

Example 3. Manufacturer - 5 th reactor 573.3 kg / h of phosphogypsum. Process temperature 57.3 kg / h of fuel oil is burned in the external furnace with an air flow rate of 1662 kg / (29 kg of air per 1 kg of fuel).

32) 1, and the resulting flue gases 20 Another part of the fuel oil (81.7 kg / h) is compressed under the reactor grate. The second fuel stream is burned before being fed into the reactor when mixed with dust from the return cyclone and air in a mass ratio of 3-5 kg of air per 1 kg of fuel. Incineration of the gas-dust mixture formed provides the process temperature of 980-1025 s. The resulting sulfur dioxide gas with a concentration of 9.5-10% is directed through a cyclone for recycling. A bite containing CaO is discharged from the reactor. Separate combustion of two fuel streams as a result of an increase in the volume of gases introduced into the reaction zone ensures uniform temperature of the firing zone, lowers the temperature of flue gases at the firing zone entrance, which contributes to quiet material burning and ensures stability of the gas phase at the outlet of the reactor.

Example 1. The capacity of the reactor is 490.7 kg / h of borogips. The process temperature is 1025 C. In the remote furnace, 73 kg / h of fuel oil are burned at an air flow rate of 1460 kg / h (20 kg of air per 1 kg of fuel). Another part of the fuel oil (100 kg / h) is burned in the injector-mixer in a mixture with the pulp coming from the cyclone

.2, Pop.1 method, I distinguish

the fact that the ratio of return, and air in an amount

3 kg per 1 kg of fuel oil. Relationship po and u with

fuel currents are 0.73. Soder-55 kov fuel supplied to the remote

sulfur dioxide in the gas phase of the furnace and for combustion mixed with dust

at the exit of the reactor 10%, maintained within 0,64-0,73.

Example 2. The performance of the reactor 467,6. kg / h of phosphoglop. The process temperature is 980 C. In the remote furnace, 55 kg / h of fuel oil are burned at an air flow rate of 1760 kg / h (32 kg of air per 1 kg of fuel). Another part of the fuel oil (86.1 kg) is combusted with dust from the return cyclone and air in the amount of 4 kg of air per 1 к.

fuel oil. The fuel flow ratio is 0.64. The content of sulfur dioxide in the gas phase at the outlet of the reactor is 9.52%.

Example 3. Manufacturer - 5 th reactor 573.3 kg / h of phosphogypsum. Process temperature 57.3 kg / h of fuel oil is burned in the external furnace with an air flow rate of 1662 kg / (29 kg of air per 1 kg of fuel).

It is mixed with dust from the return cyclone and air in the amount of 5 kg of air per 1 kg of fuel oil. The fuel flow ratio is 0.7.

The content of sulfur dioxide in the gas phase at the outlet of the reactor is 10%.

The use of the proposed method allows to reduce the process temperature to 980-1025 C and get

regional gases with a consistently set sulfur dioxide content of 9.5-10%.

Claims (1)

1. A method of processing gypsum-containing raw materials for sulfur dioxide and lime, including its thermochemical decomposition in a reducing environment created by burning fuel, collecting dust in a cyclone and returning it to the process, characterized in that, in order to stabilize the concentration of sulfur dioxide in gas phase and lower process temperatures, the fuel is divided into two streams, one of which is burned in a remote firebox with an air-fuel mass ratio (20-32): 1, and the second stream is burned before being fed into the reactor when mixed with dust from the cyclone return and air in a mass ratio of 3-5 kg of air per 1 kg of fuel. .2, Pop.1 method, we distinguish that the relationship is