A methanol evaporation oxidation process device for the production of formaldehyde by silver method

Abstract

The invention discloses a methanol evaporation and oxidation process device for production of silver-method methanal. The methanol evaporation and oxidation process device for production of silver-method methanal comprises a vaporizer mixer, a superheater, a filter, a flame arrester and an oxidizer, wherein the vaporizer mixer is a tube sheet heat exchanger; an upper end cover of the tube sheet heat exchanger is an atomization space; an air inlet is formed in the top of the atomization space; a methanol inlet and a soft water inlet are formed in the lateral wall of the atomization space and connected with atomization nozzles; air is mixed with atomized methanol and water gas and then enters the tube pass of the heat exchanger; a hot source circulates in the shell pass of the heat exchanger; an outlet of the tube pass of the heat exchanger is sequentially connected with inlets of the superheater, the filter, the flame arrester and the oxidizer. An air blower is not needed, and air resistance does not exist; meanwhile, after the novel process is adopted, the utilization rate of waste heat is greatly increased, the cooling loads are much lower than the cooling loads of cooling water of one tower of methanal in an old process, and the old process increases the usage amount of cooling water.

Description

Technical field [0001] The invention belongs to the technical field of chemical production process and equipment, and mainly relates to a formaldehyde production process device. Background technique [0002] The existing silver method formaldehyde includes the reboiler method and the bubbling method. Because the reboiler method consumes a lot of steam, it has been phased out. The bubbling methanol evaporator is composed of a methanol evaporator, a methanol circulation pump, a superheater, a batching steam distributor, a mixing filter, and a flame arrestor. The vaporization of methanol is the air passing through the methanol liquid layer in the evaporator and bubbling the methanol liquid. The methanol in the evaporator is exchanged with formaldehyde through a methanol circulation pump to realize the vaporization of methanol. After the exhaust gas is mixed, it is superheated with steam through a superheater to more than 100 degrees and completely vaporized and then sent to the ox...

AI Technical Summary

Problems solved by technology

[0003] Disadvantages of the current process: 1. The wind of the blower passes through the liquid layer of the evaporator. Due to the certain resistance of the liquid layer, the outlet pressure of the fan is increased by 5-10KPA, which reduces the operation cycle of formaldehyde production by about 15 days per year, and increases The operating power of the fan is increased, and the power consumption is increased by 1 degree / ton of formaldehyde

2. Since the methanol in the evaporator needs to be pumped out and then heated externally, two more high-power pumps are used, and the operating power is increased by about 2 degrees per ton of formaldehyde

3. Since raw steam is used for raw steam as ingredients in this process, a large amount of steam is wasted, thus increasing about 0.2 tons of steam / ton of formaldehyde

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