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Urea dilute urine solution treatment device and method

A solution processing and urea technology, applied in climate sustainability, ammonia preparation/separation, sustainable manufacturing/processing, etc., can solve problems such as aggravating production costs and environmental protection pressures, wasting steam condensate, and slowing decomposition. , to reduce the environmental pressure of enterprises, reduce production costs, and save costs

Pending Publication Date: 2020-05-12
ANHUI LIUGUO CHEM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Since the temperature of the dilute urine solution is 40 degrees when it is discharged from the dilute urine solution tank, the temperature required for decomposition is 150 to 200 degrees, and the dilute urine solution entering the hydrolyzer needs to be heated before decomposing, resulting in a slower decomposition rate; and The heating method is to directly add the external 2.5MPa medium-pressure heating steam into the liquid at the bottom of the hydrolyzer, so that the steam condensate generated by the heating steam is mixed with the hydrolyzate and cannot be recycled, wasting the steam condensate and increasing the hydrolyzate Emissions have increased the production cost of enterprises and the pressure on environmental protection

Method used

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  • Urea dilute urine solution treatment device and method
  • Urea dilute urine solution treatment device and method
  • Urea dilute urine solution treatment device and method

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Embodiment 1

[0041] Taking the urea plant with an annual output of 300,000 tons as an example, the amount of dilute urine solution processed by the hydrolyzer is 25t / h, and the medium-pressure steam consumed by the hydrolyzer is about 2t / h. The technical effects obtained by the present invention compared with those before the improvement are shown in the following table:

[0042]

[0043] 1. Economic benefit accounting:

[0044] The hydrolyzer processes 25 tons of dilute urine solution per hour, corresponding to the consumption of 2t / h of medium-pressure steam, the condensate produced by each ton of medium-pressure steam is calculated at 10 yuan, and the effective production time of the year is calculated as 300 days.

[0045]2. Annual discharge of steam condensate value:

[0046] 2t / h×24h / d×300d / y×10 yuan / t=144,000 yuan / year

[0047] 3. The annual discharge contains NH 3 About 5PPm steam condensate:

[0048] 2t / h×24h / d×300d / y=14400m 3 / y

[0049] Emission containing NH 3 The long...

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Abstract

The invention belongs to the technical field of urea production, and particularly relates to urea dilute urine solution treatment device and method. The device comprises a hydrolyzer for decomposing adilute urine solution, wherein a liquid inlet of the hydrolyzer is connected with the heating mechanism, the heating mechanism is used for heating a dilute urine solution entering the hydrolyzer, a liquid outlet of the hydrolyzer is connected with the evaporation mechanism, and the evaporation mechanism is used for heating a part of liquid phase decomposed by the hydrolyzer into steam and then conveying the steam to the hydrolyzer again to heat the hydrolyzer; and the liquid outlet of the hydrolyzer is also connected with the desorption tower through a heating mechanism. According to the invention, the dilute urine solution entering the hydrolyzer is gradually heated to the decomposition temperature, so that the dilute urine solution can be decomposed in the hydrolyzer, and the temperature of the decomposed liquid phase can be continuously utilized to heat the dilute urine solution, thereby effectively utilizing the heat energy and saving the cost.

Description

technical field [0001] The invention belongs to the field of urea production, in particular to a device and method for treating dilute urea solution. Background technique [0002] In the urea production plant, NH from the urea synthesis tower 3 , CO 2 , NH 4 COONH 2 , CO(NH 2 ) 2 、H 2 O five-element system gas-liquid mixture, the material after most of the unreacted matter is separated and recovered in the unreacted matter decomposition and recovery system is called urine, and its components are: Ur: 68wt%, H 2 O: 29wt%, NH 3 : 1.5wt%, CO 2 : 0.5wt% into the urine tank. The urine in the urine tank is pressurized by the urine pump and sent to the evaporation system to complete the separation of the water in the urine, and the urine is concentrated to 99.7wt% and sent to the granulator for granulation. The urine from the urine pump is decompressed and heated in the evaporation system to separate the water in the urine, and the evaporated water is separated into the e...

Claims

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Application Information

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IPC IPC(8): C01C1/08
CPCC01C1/08Y02P20/10
Inventor 王付生
Owner ANHUI LIUGUO CHEM CO LTD
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