What is the emission of carbon and nitrogen oxides in Maierzi kiln compared with coke shaft kiln?

Metallurgical lime is produced by coke shaft kiln and three 155m3 blast furnace gas shaft kilns. Due to the low technical level of equipment, low output, high energy consumption and poor product quality, it is difficult to meet the demand for activated lime in steelmaking, and the environmental pollution is serious, which is inconsistent with the development goals of Liugang (Group) Company to fully exercise secondary energy, vigorously develop circular economy, realize energy conservation and emission reduction and clean production. In order to eliminate backward lime production equipment and build a large-scale and precursor active lime production line matching the steelmaking capacity, the company decided to build five converter gas melting kilns with a daily output of 600 tons of metallurgical lime.

From 2007 to 20 12, Liuzhou Iron and Steel (Group) Co., Ltd. introduced five Merz kilns (R4S type) with the latest 600-ton hanging barrel structure by stages, with a total investment of about 325 million yuan and an annual design capacity of 120,000 tons, which matched the steelmaking capacity of120,000 tons.

1 and No.2 maerz kilns are supporting projects of 8 million tons of steel in Liugang. Construction started in September 2007 and was completed and put into operation in June and July 2008 respectively.

No.3 Maierzi Kiln is a complete set of 6,543,800,000 tons of steel in Liugang. Construction started in June, 2065.438+00 and was completed and put into production in September.

Maierzi No.4 Kiln and No.5 Kiln are supporting projects of 0/20,000-ton steel in Liugang. After dismantling four vertical coke kilns, the Group started construction at the original site of the vertical coke kilns in April 2065 and April 438+02, and completed and put into operation in February 2065, February 438+02 and February/0/2 respectively.

1 and No.2 maerz kilns are completely designed by foreign parties. In the production process, there have been huge accidents, such as the big brick falling off the hanging cylinder, the seam cracking of the ash hopper at the bottom of the kiln, the air leakage and ash leakage, the blockage of the gas ring pipe and the premature combustion of the spray gun, which have seriously affected the normal production of the lime kiln.

In view of the shortcomings of ofNo in production practice. 1 and No.2 and No.3 Maierzi kilns have been improved in furnace design, refractory selection, hanging cylinder pouring block construction, fan selection and centralized filtration of fan inlet air, and excellent results have been achieved.

20 1 2, during the construction of No.4 and No.5 maerz kilns, as the website of Wuhan, comprehensively absorbed the mature technologies of the first three maerz kilns, and made brand-new design and construction improvement in view of the shortcomings existing in the production and operation of the first three kilns. At present, these two maerz kilns are in the best operation state.