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Device and method for preventing crystallization of urea dissolution tank

A technology of dissolving tank and urea, applied in the directions of dissolving, dissolving, mixing, etc., can solve the problems of accelerating the crystallization and corrosion of the entire passage of the bucket elevator, so as to solve the problem of urea crystal plate dead, avoid crystal plate dead, and reduce deposition blockage. Effect

Pending Publication Date: 2018-11-30
CHINA HUANENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Crystallization began to occur from the bucket elevator, and the gate valve connecting the bucket elevator to the top of the dissolution tank was dead, so that it was in the open state for a long time, which accelerated the crystallization corrosion of the entire channel of the bucket elevator, and finally had to replace the entire bucket elevator

Method used

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  • Device and method for preventing crystallization of urea dissolution tank
  • Device and method for preventing crystallization of urea dissolution tank
  • Device and method for preventing crystallization of urea dissolution tank

Examples

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example 1

[0032] The device of the present invention, such as figure 1 As shown, it mainly consists of urea dissolving tank 12, urea crusher 3, urea feeding port 2, feed filter screen 4, dissolving tank gate valve 5, mixer 9, exhaust port 10, discharge port 13 and desalinated water flushing spray system Composition; the desalinated water flushing spray system includes a desalinated water main pipe 1, a desalinated water flushing pipe 7, a desalted water spray pipe 8 and a micro-spray rod 11; the upper part of the urea dissolving tank 12 is provided with a dissolving tank gate valve 5 and a drain The gas port 10 is provided with a discharge port 13 at the bottom; the urea feed port 2 is provided on the urea crusher 3, and the feed filter 4 is provided between the urea crusher 3 and the dissolving tank gate valve 5; the desalted water main pipe 1 is in communication with the desalinated water flushing pipe 7 and the desalinated water spray pipe 8, and the desalted water flushing pipe 7 is...

Embodiment 2

[0039] A kind of method for preventing the crystallization of urea dissolving tank of the present invention, on the basis of the device described in embodiment 1, comprises the following steps,

[0040] Step 1, first pour the desalinated water into the urea dissolving tank 12 through the desalinated water flushing pipe 7 by spraying through the feed filter 4, and then add the crushed and removed urea particles into the urea dissolving tank 12, and close it after the feeding is completed Dissolving tank gate valve 5;

[0041] Step 2, during the stirring process for the preparation of the urea aqueous solution, the desalted water is sent into the micro-spray rod 11 through the de-salted water spray pipe 8 through the stirring axis of the mixer 9, and the working pressure of the micro-spray rod 11 is 0.05Mpa-0.1Mpa, And spray through some water spray holes to suppress the entrainment of mist caused by stirring and temperature rise in the urea dissolving tank 12, so as to prevent ...

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Abstract

The present invention discloses a device and a method for preventing crystallization of a urea dissolution tank. The device comprises a urea crusher arranged outside the urea dissolution tank, a stirrer arranged in the urea dissolution tank and a demineralized water rinsing and spraying system connected with the urea crusher and the stirrer. The method comprises the following steps: step 1, a dissolution tank gate valve is closed after material feeding of the urea dissolution tank; step 2, mist entrainment of the urea dissolution tank is inhibited; and an opening connecting passage of the ureadissolution tank is avoided to be blocked by crystals; and step 3, hardened crystals and urea crystals are timely rinsed. The device and the method for preventing the crystallization of the urea dissolution tank can effectively avoid and remove the formed urea crystals, thus ensure the normal operation of the urea dissolution tank, ensure a smooth progress of a subsequent hydrolysis reaction unit, eliminate an addition of impurities into the hydrolysis system, reduce deposition and blockage of bulk materials from source, effectively avoid the appearance of the hardening of the crystals at a material feeding port, are obvious in a cleaning effect, economical and reliable, and have broad application and promotion prospects.

Description

technical field [0001] The invention relates to the technical field of flue gas nitrogen oxide pollutant removal, in particular to a device and method for preventing crystallization of a urea dissolution tank. Background technique [0002] Coal-fired power plants emit large amounts of nitrogen oxides (NO x ). In 2011, the Ministry of Environmental Protection issued the "Emission Standards of Air Pollutants for Thermal Power Plants", which requires all new thermal power units to be NO x Emissions up to 100mg / m 3 , the National Development and Reform Commission and other "Coal Power Energy Conservation and Emission Reduction Upgrading and Transformation Action Plan (2014-2020)" proposed that new units NO x Emission limit up to 50mg / m 3 . The core of controlling NOx emissions from coal-fired power plants is flue gas denitrification technology, and urea hydrolysis is one of the most popular denitrification methods because of its safety and reliability. [0003] At present,...

Claims

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Application Information

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IPC IPC(8): B01F7/18B01F3/20B01F1/00B01F15/02B01F23/70
CPCB01F21/10B01F23/70B01F27/90B01F35/7179B01F2101/2204
Inventor 向小凤张波张向宇高宁陆续徐宏杰
Owner CHINA HUANENG GRP CO LTD
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