Improved device of low-pressure system of carbon dioxide air stripping urea device

Abstract

The invention discloses an improved device of a low-pressure system of a carbon dioxide air stripping urea device. The device comprises a low-pressure methylamine condenser, a liquid level tank, a first pump group, a first circulating cooler, a first circulated cooling water inlet pipe and a first circulated cooling water outlet pipe, wherein any section of the first circulated cooling water inlet pipe or the first circulated cooling water outlet pipe is communicated with a water supply tank. In the invention, the water supply tank is additionally arranged to continuously supply water to the system so as to balance the working pressure of low-pressure circulating water; and after the improved device is used, the pressure and the temperature of the system do not greatly fluctuate any more, and the circulating water system cannot be short of water, thereby the operation pressure and the operation temperature of the system are stabilized. A washing section is additionally arranged between the liquid level tank and a subsequent section device, thus system carries less liquid, absorbs less pressure and recovers more energy, the consumption is lowered and the output is increased.

Description

technical field [0001] The invention relates to an improvement of a carbon dioxide stripping urea plant in the synthetic ammonia and urea process, in particular to an improved device for the low-pressure system of the carbon dioxide stripping urea plant which can reduce costs, increase output, and increase benefits. Background technique [0002] In the urea production design of 300,000 tons per year, the low-pressure system is the main bottleneck restricting production. In other urea plants of the same scale, the low-pressure system has also been modified many times, but the effect is not obvious. The operating pressure and temperature of the original low-pressure methylammonium condensing system fluctuate greatly, making it difficult to operate. After the water temperature rises, some desalted water will evaporate, and some will leak. In the closed-circuit cooling system, water shortages often occur, reducing the cooling effect, while the production load is heavy and the co...

AI Technical Summary

Problems solved by technology

The operating pressure and temperature of the original low-pressure methylammonium condensing system fluctuate greatly, making it difficult to operate. After the water temperature rises, some desalted water will evaporate, and some will leak. In the closed-circuit cooling system, water shortages often occur, reducing the Cooling effect, at the same time the production load is heavy and the consumption is large

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