Urea feeding device, urea feeding method, melamine production device and melamine production method

A technology of feeding device and feeding method, applied in feeding device, chemical instrument and method, organic chemistry and other directions, can solve problems such as loss of ammonia gas and increase of energy consumption

Pending Publication Date: 2022-05-10
SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome defects such as the loss of ammonia caused in the urea feeding process in the prio...

Method used

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  • Urea feeding device, urea feeding method, melamine production device and melamine production method
  • Urea feeding device, urea feeding method, melamine production device and melamine production method
  • Urea feeding device, urea feeding method, melamine production device and melamine production method

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Effect test

Embodiment 1

[0055] The present embodiment provides the urea feeding method, adopts such as figure 1 Shown feeding device, concrete steps are as follows:

[0056] Taking the 50,000-ton melamine plant as an example, the melamine produced per hour is 7 tons, and the solid urea raw material consumed is 21 tons. The urea feeding system device mainly includes a first front cut-off valve 3 , a first booster unit 1 , a first rear cut-off valve 5 , a urea washing tower 7 , a urea circulation pump 8 and a reaction unit 9 .

[0057] When feeding, open the first front cut-off valve 3, and send 2 tons of solid urea into the first booster unit 1. Close the first front cut-off valve 3 and the first rear cut-off valve 5, send in the ram gas, after the pressure of the booster unit is increased from normal pressure to 0.4Mpa, stop feeding the booster gas. Open the first cut-off valve 5 to send solid urea into the urea washing tower 7. The urea circulation volume is 1000m 3 / h, after the solid urea dire...

Embodiment 2

[0061] The present embodiment provides the urea feeding method, adopts such as figure 2 Shown feeding device, concrete steps are as follows:

[0062] Taking the 100,000-ton melamine plant as an example, the melamine produced per hour is 14 tons, and the solid urea raw material consumed is 42 tons. The urea feeding device mainly includes a first front cut-off valve 3 , a first booster unit 1 , a first rear cut-off valve 5 , a urea washing tower 7 , a urea circulating pump 8 , a reaction unit 9 and a premixing unit 10 .

[0063] When feeding, open the first front cut-off valve 3, and send 4 tons of solid urea into the first booster unit 1. Close the first front cut-off valve 3 and the first rear cut-off valve 5, send in the ram gas, after the pressure of the first boost unit 1 is increased from normal pressure to 0.8Mpa, stop feeding the boost gas. Open the first post-cut-off valve 5 to send the solid urea and liquid urea from the urea circulation pump to the urea washing tow...

Embodiment 3

[0069] The present embodiment provides the urea feeding method, adopts such as image 3 Shown feeding device, concrete steps are as follows:

[0070] Taking the 100,000-ton melamine plant as an example, the melamine produced per hour is 14 tons, and the solid urea raw material consumed is 42 tons. The urea feeding device mainly includes a first front cut-off valve 3 , a first booster unit 1 , a first rear cut-off valve 5 , a urea washing tower 7 , a urea circulating pump 8 , a reaction unit 9 and a premixing unit 10 .

[0071] When feeding, open the first front cut-off valve 3, and send 4 tons of solid urea into the first booster unit 1. Close the first front cut-off valve 3 and the first rear cut-off valve 5, send in the ram gas, after the pressure of the first boost unit 1 is increased from normal pressure to 1.0Mpa, stop feeding the boost gas. Open the first post-cut-off valve 5 to send the solid urea and liquid urea from the urea circulation pump to the urea washing towe...

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Abstract

The invention belongs to the technical field of melamine production, and particularly relates to a urea feeding device, a urea feeding method, a melamine production device and a melamine production method. The feeding device comprises a first boosting unit, a first front stop valve and a first rear stop valve, the urea washing unit, the reaction unit and the urea circulating pump are used for leading out the liquid urea from the urea washing tower, providing the liquid urea to the reaction unit and circulating the liquid urea back to the urea washing tower. The pressure of solid urea is increased through the pressure increasing unit, and the pressure in the urea washing tower is lower than that of the pressure increasing unit, so that ammonia gas loss, environmental pollution and device ammonia consumption increase caused by ammonia gas in the urea washing tower and ammonia gas dissolved in urea entering the outside from the urea washing tower are avoided. The solid urea is directly fed into the urea washing tower for melting, so that the energy consumption of extra melting urea is reduced. And the urea circulating pump for washing of the urea washing tower is used for circulating urea and providing heat, so that independent increase of circulation is avoided, and the power consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of melamine production, and in particular relates to a urea feeding device, a feeding method, and a melamine production device and method. Background technique [0002] Melamine is an important chemical product, and urea is the raw material for producing melamine. In production, most production enterprises do not have supporting urea production equipment, so there is no molten urea that can be used directly, and solid urea needs to be purchased as raw material. [0003] In the production process of melamine, solid urea needs to be prepared as liquid urea and then added to the production unit. In the existing technology, the process of producing melamine with solid urea as raw material is as follows: the solid urea is sent to a feeding tank through a screw feeder, and a steam heater is arranged in the feeding tank. The solid urea is indirectly heated by steam to a temperature above 132.7°C (the melting poin...

Claims

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Application Information

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IPC IPC(8): B01J4/00C07D251/60
CPCB01J4/001B01J4/008C07D251/60
Inventor 孔德利莫玉馨宋国天李忠云唐印
Owner SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD
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