Process and device for reclaiming hydrolysis desorption heat energy

A technology for recovering equipment and heat energy, which is applied in the preparation of organic compounds, preparation of urea derivatives, chemical instruments and methods, etc. It can solve the problems of unstable operation of the first suction tower, great influence of circulating water, waste of circulating water, etc. Achieve the effect of saving cost, reducing emptying volume and reducing consumption

Active Publication Date: 2010-09-08
LUXI IND EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Disadvantages of the current process: circulating water is used as a cooling medium, which causes waste of circulating water and energy consumption; at the same time, circulating water is greatly affected by seasonal temperature, which brings unstable factors to the operation of the first suction tower

Method used

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  • Process and device for reclaiming hydrolysis desorption heat energy
  • Process and device for reclaiming hydrolysis desorption heat energy
  • Process and device for reclaiming hydrolysis desorption heat energy

Examples

Experimental program
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Embodiment 1

[0018] A recovery process for hydrolysis and desorption heat energy. The gas from the hydrolysis and desorption tower 1 is sent to the second dimethyl liquid preheater 2 to cool down to 100°C and then enters the gas-liquid separator 3. The condensate obtained after separation enters the reflux Pump 5, the obtained gas directly enters the middle section of the second-stage decomposition tower 4 to backflush the descending urine.

[0019] A recovery device for hydrolysis and desorption heat energy, comprising a hydrolysis and desorption tower 1, the hydrolysis and desorption tower 1 is connected to a second dimethyl liquid preheater 2, the second dimethyl liquid preheater 2 is connected to a gas-liquid separator 3, and the gas-liquid The upper end of the separator 3 communicates with the second-stage decomposition tower 4, and the lower end is connected with a reflux pump 5.

Embodiment 2

[0021] A recovery process for hydrolysis and desorption heat energy. The gas from the hydrolysis and desorption tower 1 is sent to the second dimethyl liquid preheater 2 to cool down to 130°C and then enters the gas-liquid separator 3. The condensate obtained after separation enters the reflux Pump 5, the obtained gas directly enters the middle section of the second-stage decomposition tower 4 to backflush the descending urine.

[0022] A recovery device for hydrolysis and desorption heat energy, the structure is the same as that of Embodiment 1.

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Abstract

The invention relates to a process and a device for reclaiming hydrolysis desorption heat energy. The process comprises the following steps: introducing gas from a hydrolysis desorption tower to a second preheater for a secondary ammonium carbamate solution for cooling, introducing to a gas-liquid separator, introducing a separated condensate to a reflux pump, and directly introducing the obtained gas to the middle section of a second-stage decomposing tower to carry out the backblowing on descending urine. The invention omits the water-cooling device in the original hydrolysis desorption flow, and lowers the consumption of circulating water; the hydrolysis desorption gas phase is directly introduced to the second ammonium carbamate preheater to make full use of the energy of the hydrolysis desorption gas phase, thereby raising the use ratio of the energy, and simultaneously reducing the gas release of the system; and the use of the technology can save about 0.1 ton of circulating water per ton of carbamide and save 10 kilograms of steam per ton of carbamide, thereby saving the cost.

Description

Technical field: [0001] The invention relates to the secondary utilization of hydrolysis and desorption gas phase heat energy in urea production, in particular to a recovery process and equipment for hydrolysis and desorption heat energy. Background technique: [0002] The gas phase heat energy reuse technology of the hydrolysis desorption tower has always been a problem that is difficult to solve and often overlooked by many enterprises. Especially with the continuous expansion of urea production, the country pays more attention to environmental protection issues, and the gas phase heat energy reuse of the hydrolysis desorption tower is more obvious. important. Existing hydrolysis desorption tower gas phase flow process (as attached figure 1 )Condition: [0003] After the gas phase of the hydrolysis desorption tower is completely condensed by the gas phase cooler, the non-condensable gas enters the tail suction tower for absorption and then is emptied, and the condensate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C273/02C07C275/00
Inventor 张庆喜王延峰魏传国刘吉祥陈才修
Owner LUXI IND EQUIP
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