Method for recovering ammonia from purge gas

A technology of purge gas and ammonia recovery, applied in the field of medium and small chemical fertilizer plants, can solve the problems of low added value of dilute ammonia water and ammonium bicarbonate, pollution, consumption of large amounts of water and energy, etc., and achieve good economic benefits.

Inactive Publication Date: 2007-01-10
窦和轩 +1
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Problems solved by technology

The added value of dilute ammonia water and ammonium bicarbonate is relatively low. The production process also co

Method used

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  • Method for recovering ammonia from purge gas
  • Method for recovering ammonia from purge gas

Examples

Experimental program
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Example Embodiment

[0036] Example 1: Isobaric recovery in theory and experiment

[0037] Different manufacturers, the outlet pressure of the purge gas is also different, and the ammonia content and temperature are also directly related, we choose the more representative 15 ℃, 2.2Mpa, 1m 3 For subsequent calculations, the specific composition is shown in Table 3.

[0038]

[0039] 1.1 Theoretical calculation

[0040] according to figure 1 Schematic diagram of the isobaric recovery process of purge gas ammonia:

[0041] At 0.25Mpa, the vaporization temperature of liquid ammonia is given by the gram-gram equation (ie formula 1)

[0042] ln(0.25 / 0.1)=23300 / 8.314(1 / 239.8-1 / T 2 )

[0043] (Assuming ΔH vap (Does not change with temperature in a small range)

[0044] Solution: T 2 =265.04K=-8.1℃ [actually -14℃, for the convenience of calculation, we take -10℃]

[0045] Look up the table to get the ΔH of liquid ammonia vaporized at -10℃ vap =22.030KJ / mol

[0046] Temperature / item

[0047...

Example Embodiment

[0091] Example 2 Purge gas ammonia isobaric + energy conversion and recovery

[0092] Such as figure 2As shown, isobaric recovery generally reduces the temperature of the purge gas to -10°C, so that most of the ammonia is condensed and separated, and the recovery rate is about 70%. After improvement, energy conversion is performed after isobaric recovery, and the Joule-Thomson effect is used to further reduce the purge gas temperature after recovering most of the ammonia, and then heat exchange can further increase the ammonia recovery rate. The improved device is shown as figure 2 After passing through two heat exchangers, the temperature of the purge gas is reduced to below -20℃, and the ammonia recovery rate will reach above 80%. When the recovery rate is 80%, the composition and related parameters of the remaining gas are shown in Table -7 .

[0093] At -20℃, the saturated vapor pressure of liquid ammonia is P = 0.1966Mpa

[0094] Vaporized ΔH vap (-20)=22573J / mol

[0095] Sup...

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Abstract

This invention relates to a method for recovering ammonia from relaxed gas, which condenses the relaxed gas with a heat-exchanger then to realize gas-liquid separation in a gas-liquid separation device, then the separated liquid ammonia goes back to the above exchanger to be depressed and evaporated to exchange heat for providing a part of cold volume, and gas from the separator can join in the heat exchange in the exchanger or to reduce the temperature by the energy converter then to exchange heat in the above energy exchanger. In this invention, the recovery of ammonia reaches to over 90%, not necessary to add any foreign refrigeration devices or cost extra energies.

Description

technical field [0001] The present invention relates to the recovery of gaseous ammonia in purge gas. Specifically, the present invention designs a new technological process for the recovery of purge gas ammonia. ; The ammonia in the nitrogen fertilizer factory's vent gas can be recovered, and finally gaseous ammonia or liquid ammonia can be obtained according to needs. Background technique [0002] In the past, the raw material gas for ammonia synthesis of small and medium-sized chemical fertilizer manufacturers in my country did not pass through the cryogenic device like the large chemical fertilizers put into production now, so the raw gas contained a large amount of methane, argon and other gases, resulting in the gas compressed into the ammonia storage tank containing concentrated The inert gases such as methane and argon that have been depleted cannot be completely reused like large-scale chemical fertilizer plants, and a part must be released. We call this part of the...

Claims

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Application Information

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IPC IPC(8): C01C1/12
Inventor 窦和轩高峰
Owner 窦和轩
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