Our factory vacuum system transformation summary

Foreword Hubei Shuanghuan Technology Co., Ltd. Salt Factory currently has three sets of vacuum evaporation salting devices (ie, I, ", and group tanks"), of which group I tank design production capacity of 20,000 tons / year, "the design capacity of the cans is 12 Ten thousand t/year, the design productivity of the group tank is 1+ million t/year. Due to the low degree of vacuum, the three sets of vacuum evaporation salt making devices of our factory have not reached the designed production capacity. For this reason, our factory has carried out a series of transformations on the vacuum systems of three sets of evaporation devices in recent years, and achieved good results.

2 20,000 tons vacuum evaporation evaporation system (Group I tank) vacuum system modification 2.1 Water spray pumping capacity is insufficient 2.1. 1 Calculated according to the empirical formula: = 29.27/6(273+ts)/p-Ps The condenser air volume/6 is compared with the water jet volume V.

Salt production process management.

2.1.2 From the empirical formula, it is calculated that the amount of air infiltration is greater than the volumetric volume of water sprayed by V9.7m3/>; the suction capacity of the water jet has a large gap between the ultimate vacuum and the steaming.

2.1.3 The salt industry actually proves that, under certain conditions, the water spray can only remove 100 kg of non-condensable gas produced under the condition of 0.090 MPa, and the steam spray can be used under the condition of 0.094 MPa. Take it away.

2.2 Conversion from two-stage water injection to two-level water injection + “class-level steam injection” 2.2.1 On January 2, 1998, the company used a group of tank shutdown maintenance opportunities, first eliminating the original water supply pump to the water tank and supplying the water pump. The inlet is directly connected to the circulation water tank; the condenser and the secondary water-spraying sewage pipe are changed to the atmosphere condenser water-sealing pool, which is to remove the small circulation between the original water supply pump, the water spray, and the water tank, so that the water spray water is directly used. Use recycled water.

2.2.2 On January 27, 1998, we opened a steam ejector at the top of the atmospheric condenser to suck the non-condensable gas in the atmospheric condenser together with the original water jet, 0.6MP+ steam from the drying plant. Welding a pipe! 57mm carbon steel pipe to the top of the steam ejector.

2.2.3 On January 28, 1998, we positioned and installed a condenser under the steam ejector and passed through the condenser water pipe to the water-sealing tank so that the suctioned non-condensable gas and mixed steam were introduced into the condenser. Vapor-liquid separation, and then discharged to the water seal pool. In addition, a tee is installed on the condensate inlet pipe so that the condensate can be directly used in the circulating water, and can also be used after being pressurized by a water supply pump.

2.2.4 The steam velocity of steaming is fast, and there are many entrained vapors. On January 29, 998, we opened one in the upper part of the steaming condenser and the upper part of the first-stage water spray condenser, and after entering the pipe, we entered. The secondary water spray and the secondary water spray re-suction the vaporized condenser and the upper vapor of the first-stage water spray condenser.

Table 1 Effect of Salt Reformation on Vacuum System Reconstruction Project Summer/Winter Pre-reconstruction Project After Modification Retrofitting After Reformation Vacuum Degree Effect Liquid Temperature (7) Best Vacuum Maximum End-point Temperature (7) Yield Significantly Increased Salt: 196,000 tons; after the transformation, salt was produced in 1998: 243,000 tons.

The economic benefits are significant at the company's internal price of raw salt of 108 yuan/t. In 1998, the Group I tank increased by 3 years and the annual output of 120,000 tons of vacuum evaporation salt making equipment (group tanks) vacuum system transformation tank was the factory (former Hubei chemical plant) itself The 120,000 t/year evaporation device designed, manufactured and installed was put into operation in June 1985. Because the main equipment of the device is made of carbon steel and the heating pipe is a brass pipe, after eight years of use, the evaporation tank body is seriously corroded, and the heating pipe is worn out over a large area, which seriously affects the normal operation of the device. In 1993, the salt factory used the company's overhaul opportunity to upgrade the atmospheric condenser of the vacuum equipment of the group's tanks in December 2001. The inner structure of the watering board was changed to a nozzle type, and the outer water supply pipe was arranged in three layers. There are 32 nozzles layered around the atmospheric condenser wall, making the heat exchange between gas and liquid changes from showering to mist, increasing the heat exchange area between gas and liquid, and enhancing the cooling of secondary steam. As a result, the after-effect vacuum is improved by 0.089 MP+ and stabilized at 0.094 MP+, which increases the driving force of the heat transfer process and increases the salt output.

4 annual production of 150,000 tons vacuum evaporation salt making device (group tank) vacuum 2丨 system transformation 4.1 from two-stage water spray transformation to a primary steam injection - water ring vacuum pump salt factory on January 5, 2002 for axial flow pump, Centrifuge and induced draft fan oil cooling water were recovered, totaling 9.328 m3/h, and a collecting bucket was installed for steaming condenser water.

Water ring vacuum pump 2BE12030 model meaning, working principle, main features and performance.

4.1.2.1 Meaning of each model Inhalation limit Absolute pressure code 11 Up to 160 kPa. Impeller length to diameter ratio code - nominal radius of the impeller in centimeters Note: Because the local atmospheric pressure is 1. 105Pa: 1.013x103kPa, so suction limit vacuum: atmospheric pressure - Absolute pressure working principle The impeller is eccentrically mounted in a nearly circular pump body. When the impeller rotates in the direction of the arrow in the figure, the liquid injected into the pump body forms a rotating liquid ring due to the centrifugal force. The inner surface of the liquid ring and the impeller A crescent-shaped space is formed between the hubs. When the impeller turns from point A to point B, the volume enclosed by two adjacent blades gradually increases, gas is sucked in from the outside, and when the impeller turns from point C to point A, , The corresponding chamber is changed from large to small, so that the original suction gas is compressed, when the pressure reaches the water ring vacuum pump schematic diagram a) a wide range of suction: the ultimate absolute pressure up to 33hPa, with a P-type injector, can Get a higher vacuum. ) Pumping capacity (extraction speed) is large: from the 2BE1 series vacuum pump type spectrum can be found 2BE12030 vacuum pumping rate is D) structural design is perfect: equipped with a flexible valve plate and exhaust port, to ensure the smooth operation of the process; Automatic drain valve to avoid over-hydraulic start; when anti-cavitation valve is installed, it can prevent cavitation damage during high vacuum operation; when installing spray device, it can make high temperature gas fully before entering the pump. Shrinkage, increase pumping volume.

Before the renovation, there are two levels of water spray (the schematic diagram shows the vacuum system before the reform of the I group tank). The schematic diagram of the vacuum system after the transformation is as follows: the effect after the transformation is used! After the vacuum system was modified from a two-stage water jet to a one-stage steam jet-water ring vacuum pump, the final vacuum was increased from -88 kPa to -95 kPa, the effective temperature difference increased by approximately 81, and the output increased by approximately 202. 5 Conclusion Our factory By I! After the vacuum system of the canning salt plant was reformed, the vacuum degree increased significantly and the yield increased significantly. In addition, our factory prepares to reform the vacuum system of salt-nitrate co-production plant put into operation in April 1999 and install a rotary spray device inside the secondary steam pipe to directly condense secondary steam to further improve the combined production of salt and nitrate. The degree of vacuum achieved double harvest of salt and nitrate products.

(:002-04 (edit / Lin Meiying)

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