Ammonia storage tank with gas ammonia valve and method for ammonia supply by gas ammonia/liquid ammonia conversion

A technology for ammonia storage tanks and valves, which is applied in the field of ammonia storage tanks with gas ammonia valves and the conversion of gas ammonia and liquid ammonia to supply ammonia, which can solve problems such as unfavorable system pressure, troublesome adjustment, leakage of pipeline joints and valve cores, etc. Achieve the effects of improving annealing quality, reducing labor intensity and stabilizing pressure

Inactive Publication Date: 2012-04-18
XINYU IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional ammonia storage tank is only equipped with a single liquid ammonia output valve. The summer weather is hot, and the evaporation of liquid ammonia is large, so that the pressure in the ammonia storage tank continues to rise. When the pressure of the ammonia storage tank exceeds 1.0MPa, the high pressure will cause the pipeline Leakage occurs in joints and valve cores, which not only wastes liquid ammonia, but also is not conducive to the control of system pressure. The pressure and flow must be adjusted 5 to 10 times per shift, and the pipeline joints and valves must be replaced frequently; when the ammonia storage tank When the pressure exceeds 2.0MPa, in order to avoid the explosion of the ammonia storage tank, the safety valve is forced to open to release the pressure, and the ammonia gas is released
The above operations are unsafe and troublesome to adjust

Method used

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  • Ammonia storage tank with gas ammonia valve and method for ammonia supply by gas ammonia/liquid ammonia conversion
  • Ammonia storage tank with gas ammonia valve and method for ammonia supply by gas ammonia/liquid ammonia conversion

Examples

Experimental program
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Embodiment 1

[0010] Example 1: Such as figure 1 Shown: a kind of ammonia storage tank with gas ammonia valve, on the outside of the end of the ammonia storage tank, there is a vertical liquid level gauge 1 which is convenient for observing the liquid level in the ammonia storage tank, and on the outside of the other end of the ammonia storage tank, there is a A thermometer 11 for observing the temperature in the ammonia storage tank; a liquid ammonia output valve 2 and a gas ammonia output valve 4 are respectively installed on the top surface of the ammonia storage tank, and the liquid ammonia output valve 2 and the gas ammonia output valve 4 are respectively connected to the evaporation tank through pipelines , the connecting pipe of the liquid ammonia output valve 2 goes deep into the bottom of the ammonia storage tank, and the gas supply mode is selected according to the external air temperature and the pressure in the ammonia storage tank; a filling pressure balance valve 3 is also in...

Embodiment 2

[0011] Example 2: combine figure 1 : A gas-phase ammonia and liquid-phase ammonia conversion ammonia supply method using an ammonia storage tank with a gas ammonia valve, the gas supply mode of the ammonia storage tank is switched with the rise and fall of the external temperature: the external temperature is greater than 20 ° C, the evaporation of liquid ammonia is large, Using the principle of liquid ammonia evaporation, vaporization, heat absorption, let the liquid ammonia evaporate into ammonia gas in the ammonia storage tank, when the pressure in the ammonia storage tank is 0.6MPa~0.8MPa, close the liquid ammonia output valve 2 of the ammonia storage tank, open the The ammonia gas output valve 4 of the ammonia tank supplies ammonia gas to the evaporation tank (not shown in the figure), so that the temperature in the ammonia storage tank decreases and the pressure decreases accordingly. The outside temperature is not higher than 20°C, the liquid ammonia evaporates less i...

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Abstract

The invention relates to an ammonia storage tank with a gas ammonia valve and a method for ammonia supply by gas ammonia/liquid ammonia conversion. The ammonia storage tank is characterized in that a gas ammonia output valve is further installed on the top surface of a conventional ammonia storage tank. The method for ammonia supply by gas ammonia/liquid ammonia conversion, in which the ammonia storage tank with the gas ammonia valve is used, has the characteristic of switching along with the rise and drop of external temperature: when the external temperature is higher than 20 DEG C and the pressure in the ammonia storage tank is from 0.6 MPa to 0.8 MPa, the gas ammonia output valve is opened to supply gas ammonia to an evaporation tank; and when the external temperature is not higher than 20 DEG C and the pressure in the ammonia storage tank is from 0.4 MPa to 0.6 MPa, a liquid ammonia output valve is opened to supply liquid ammonia to the evaporation tank. The method can reduce the temperature and pressure in the ammonia storage tank, thus avoiding overpressure and ensuring safe production.

Description

technical field [0001] The invention relates to an ammonia storage tank and an ammonia supply method, in particular to an ammonia storage tank with a gas ammonia valve and a gas ammonia and liquid ammonia conversion ammonia supply method. Background technique [0002] Bright annealing is usually required after the cold-rolled steel strip is rolled to meet the processing requirements of the subsequent process. In order to ensure that the surface of the steel strip is not oxidized during the annealing process, it needs to be protected with nitrogen and hydrogen after ammonia gas decomposition. The gas supply process is: open the liquid ammonia gas supply valve of the ammonia storage tank, the liquid ammonia is sent to the evaporation tank for evaporation, the ammonia gas is heated up by the heat exchanger, and sent to the 800°C decomposition furnace to be decomposed into nitrogen and hydrogen, and the nitrogen and hydrogen are then heat exchanged The temperature of the device...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17C1/00F17C13/04
Inventor 周勇前李期琇
Owner XINYU IRON & STEEL CO LTD
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