Liquid ammonia vaporization method

A liquid ammonia and vaporizer technology, which is applied in the method of container discharge, gas/liquid distribution and storage, and equipment discharged from pressure vessels, etc., can solve the problem of reduced heat exchange efficiency, unstable ammonia pressure transportation, and poor operation safety. and other problems, to achieve the effect of maintaining continuous and stable discharge, making full use of heat exchange efficiency, and avoiding the increase of heat exchange thermal resistance.

Active Publication Date: 2013-03-20
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the circulation of steam or hot water is insufficient, the water in the air is cooled and frosted on the surface of the heat exchange tube of the ammonia heater, the thermal resistance of heat exchange is greatly increased, and the heat exchange efficiency is reduced
At the same time, the temperature difference between the inside and outside of the heat exchange tube of the ammonia vaporizer is large, the equipment is prone to fatigue, and the operation safety is poor. When the steam pressure fluctuates, the ammonia gas pressure transmission is unstable, and it is difficult to operate continuously and stably.

Method used

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  • Liquid ammonia vaporization method

Examples

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Effect test

Embodiment 1

[0026] 2.0MPa steam enters the reboiler tube side through the steam port at 643kg / h, heats the dimethoxymethane in the reboiler after heat exchange through the heat exchange tube, and the steam condenses to form water at 106°C and flows out at 643kg / h for reboil Dimethoxymethane is heated and vaporized at 536kg / h, heated to a temperature of 65°C, and becomes dimethoxymethane gas after heat exchange, and rises into the vaporizer, and the dimethoxymethane gas heats the tube side of the vaporizer , exchange heat with ammonia in the tube side of the evaporator, condense into a heat medium liquid, and then flow into the reboiler;

[0027] The liquid ammonia from the outside enters the tube side of the vaporizer at 1360kg / h, receives the heat provided by the heat medium gas and vaporizes into gaseous ammonia at a temperature of 52°C and a pressure of 1.0MPa. The gaseous ammonia is discharged through the outlet of the tube side of the vaporizer at a flow rate of 1360kg / h. The regulat...

Embodiment 2

[0029] 2.5MPa steam enters the reboiler tube side through the steam port at 598kg / h, heats the dimethoxymethane in the reboiler after heat exchange through the heat exchange tube, and the steam condenses to form water at 126°C and flows out at 598kg / h for reboiler Dimethoxymethane is heated and vaporized at 633kg / h, and heated to a temperature of 121°C. After heat exchange, it becomes dimethoxymethane gas and rises into the vaporizer, and the dimethoxymethane gas heats the tube side of the vaporizer , after heat exchange with ammonia in the tube side of the evaporator, it condenses into a heat medium liquid, and then flows into the reboiler, wherein the reboiler communicates with the evaporator;

[0030] The liquid ammonia from the outside enters the vaporizer tube at 1360kg / h, receives the heat provided by the heat medium gas, and vaporizes into gaseous ammonia at a temperature of 105°C and a pressure of 2.0MPa. The regulating valve directly controls the flow and pressure of ...

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Abstract

The invention discloses a liquid ammonia vaporization method. The liquid ammonia vaporization method is mainly used for solving the problems that equipment is subjected to water attack, the surface of a heat exchange pipe is frosted and the heat exchange efficiency is reduced due to the vaporization of liquid ammonia. The liquid ammonia vaporization method comprises the following steps: heating vapor enters a reboiler tube pass from a vapor port and heats a heat medium in a reboiler after being subjected to heat exchange with the heat exchange pipe, and water produced through vapor condensation flows out of the reboiler; the heat medium is heated to vaporize and becomes heat medium gas after being subjected to heat exchange, the heat medium gas rises into an vaporizer, heats a vaporizer tube pass and is condensed into heat medium liquid after being subjected to heat exchange with ammonia in the vaporizer tube pass, and the heat medium liquid flows into the reboiler; and liquid ammonia enters the vaporizer tube pass and is vaporized into gaseous ammonia after receiving heat supplied by the heat medium gas, and the gaseous ammonia is discharged from the outlet of the vaporizer tube pass.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for vaporizing liquid ammonia. Background technique [0002] The process of converting industrial liquid ammonia into gaseous ammonia is widely used in chemical equipment, refrigeration, heat treatment and other industries. Gaseous ammonia is often used in the amination reaction. Ammonia is mainly heated by a heater through liquid ammonia to vaporize it and maintain the required pressure. [0003] In the prior art, the vaporization of liquefied ammonia is provided by a vaporizer for heating hot water by electric heating, and the vaporizer vaporizes the industrial liquid ammonia. The heat of vaporization of ammonia is 327.3 kcal / kg. In industrial production, ammonia vaporization needs to absorb a lot of heat. When the vaporized gas production deviates from the design value, severe water hammer will occur in the ammonia vaporizer. When the circula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17C7/04
Inventor 杨建明吕剑赵锋伟马辉张伟庞国川石磊
Owner XIAN MODERN CHEM RES INST
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