The Study Of Increasing Production And Decreasing Consumption And Equipment Reconstruction On Φ3200 Self Return Soda Ash Steam Calciner

Soda is a very important basal chemical product. The calcination of sodium bicarbonate is the crucial working procedure of soda production. The high-efficiency and energy-saving equipment of calcination is Steam calciner at present. According to the technique and economical problems such as short running period, low production and high consumption that encountered in the running of the largest self return soda ash Steam calciner inland at Honghe Chemcial Inc., this paper analyses the cause of the problems above mentioned and puts forward the solutions to reconstruct the calciner to increase production and to decrease consumption .Via the reconstruction at the entrance of return soda ash of calciner, the quantity of return soda is increased, and this changes the way that soda enter the calciner from discontinuous entering to continuous entering, avoids scaring at the entrance of return soda of calciner, and prolongs the running period of calciner. Meanwhile, we change the discharging approach, which is that from discharging the non-condensable gas out of calciner from its head to the exterior of rear, or to discharge the non-condensable gas automatically without any discharging tubule by utilizing the forward flow between steam and cooling water. As a result, the puzzle, which is that the running period of calciner is affected by the leak of non-condensable gas tubule, gets solved absolutely. The running period of calciner is prolonged from 20 days in 1990 to three month. It can be over half a year now. The running efficiency of self return soda ash Steam calciner is improved to 96%. This comes up to the advanced standard of soda industry.Aiming at the problem, which is that the production of calciner is low, this paper puts forward three momentous technique-improving measures. One is that improving the rotation numbers of calciner from 4r/min to 5r/min. Another is that increasing the heating area of 1# calciner from 2670 m~2to 3307 m~2. The heating area of 2 calciner increases much bigger, its total heating area is up to 3600 m . And changing the relative flow direction between steam and cooling water from adverse current to forward flow. This enhances heat transfer and forces hydrophobic. And the third is that reinforcing the 1.88-meter- long premixing section of 1# calciner and adding new premixing section to 2# calciner. The total length of the premixing section comes up to 5.32 meters. So the premixing effection gets improved. Via the three large technique improving measures aforesaid , the capability of calciner is improved apparently, the throughput of 1# calciner, with the capability for 400-450t/d before, is improved to 550t/d, it reaches the designed capability for the first time. The throughput of 2# calciner is improved to 550~600t/d, it overpasses the designed capability which is 550t/d, it increases 37.5%. The quality of soda ash also gets improved because of the amelioration of the premix of return soda and sodium bicarbonate. The consumption of steam is reduced from 1530kg/t to 1484kg/f, it reduces 3% and saves 8349t steam in one year, this can save RMB 568,000 yuan. The running current of 2 calciner is reduced from 220-260A before to 180-200A, this saves 120,000- 180,000kwh in one year, that is RMB 50,400-75,600 yuan.The sealing problem of calciner is a big technology puzzle concerned by the whole industry. Two improving solutions for the seal of calciner are represented through analyzing and comparing the principle and the structures of the seal. Their common characteristic is to make the soda ash, which is leaked to the front of mechanical seals, back to the inner calciner. The functing of mechanical seals is to isolate the inner gas and the air outside. The implementing results of the two solutions show that the waste of soda ash is reduced, the density of inner gas(CO2) changes little and the operation environment is ameliorated.The pulverous efflux of insulated material of calciner results in environmental pollution, destroys the lubrication of the rolling ring and supporting wheel and theinc...