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Device and process for recycling water heat energy by using melamine

A melamine and recycling technology, applied in heat exchange equipment, lighting and heating equipment, separation methods, etc., can solve the problems of large amount of circulating cooling water, large drainage, and high energy consumption, and achieve energy saving, reduction in addition and emissions. Effect

Active Publication Date: 2019-01-18
青海黎明化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Current industry design methods such as figure 1 As shown, specifically: after the temperature of the recycled water in the wastewater decomposition tower drops to 160-170°C through heat recovery, the temperature is directly lowered to about 60°C by using circulating cooling water, and then enters the recycling water tank; while the water in the waste water stripping tower, Then discharge it directly after cooling to 50°C; this treatment method requires a large amount of circulating cooling water, high energy consumption, large displacement, and a large amount of supplementary water, which should be improved

Method used

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  • Device and process for recycling water heat energy by using melamine
  • Device and process for recycling water heat energy by using melamine

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A unit for producing 10t / h melamine, 66t / h hot water is recycled and the temperature is 163°C. A set of 4.2 million kcal lithium bromide refrigeration unit is added to reduce the temperature of the recycled hot water to 75°C and generate a low temperature of 15°C at the same time. water.

[0030] Add a heat exchange area of ​​250m to the discharge line of the waste water stripper 2 The original 20t / h 50°C discharge water is cooled with the above-mentioned 15°C low-temperature water, and the temperature is lowered to 25°C.

[0031] The above-mentioned water at 25°C is used to wash the exhaust gas of the melamine drying device, so that the drying exhaust gas can be discharged up to the standard. At the same time, the washing water is recycled to the melamine production system.

[0032] In this way, the water discharge is reduced by 20t / h, and the desalinated water supply is reduced by 20t / h. At the same time, circulating and reclaiming hot water reduces the circulating ...

Embodiment 2

[0034] A device for producing 7.5t / h melamine, recycling hot water 50t / h at a temperature of 160°C, and adding a set of 2.5 million kcal lithium bromide refrigeration unit to reduce the temperature of recycled hot water to 80°C, while generating 12°C low temperature water.

[0035] Add a heat exchange area of ​​200m to the discharge line of the waste water stripper 2 The original 15t / h 50°C discharge water is cooled with the above-mentioned 12°C low-temperature water, and the temperature is lowered to 20°C.

[0036] The above-mentioned water at 20°C is used to wash the exhaust gas of the melamine drying device, so that the drying exhaust gas can be discharged up to the standard, and the washing water is recycled to the melamine production system.

[0037] In this way, the water discharge is reduced by 15t / h, and the desalinated water supply is reduced by 15t / h. At the same time, circulating and reclaiming hot water reduces the circulating cooling water volume by 450t / h.

Embodiment 3

[0039] A set of equipment for producing 5t / h melamine, 33t / h hot water is recycled and the temperature is 168°C, a set of lithium bromide refrigeration unit of 2 million kcal is added to reduce the temperature of recycled hot water to 75°C, and a low temperature of 10°C is generated at the same time. water.

[0040] Add a heat exchange area of ​​120m to the discharge line of the waste water stripper 2 The original 10t / h 50°C discharge water is cooled with the above-mentioned 10°C low-temperature water, and the temperature is lowered to 20°C.

[0041] The above-mentioned water at 20°C is used to wash the exhaust gas of the melamine drying device, so that the drying exhaust gas can be discharged up to the standard, and the washing water is recycled to the melamine production system.

[0042] In this way, the water discharge is reduced by 10t / h, and the desalinated water supply is reduced by 10t / h. At the same time, circulating and reclaiming hot water reduces the circulating c...

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Abstract

The invention discloses a device and process for recycling water heat by tripolycyanamide. The process comprises the specific steps that after tripolycyanamide recycled water is added into a waste water decomposition tower to be decomposed, wherein the heat of one part of waste water is recycled to obtain waste water of 160-170 DEG C; then the temperature of waste water is further lowered to 75-80 DEG C through a lithium bromide refrigerating unit, and meanwhile low-temperature water at 7-20 DEG C is prepared; the waste water at 75-80 DEG C is cooled to 60 DEG C through a cooler to be used as recycled water for recycling; the other part of water treated in the waste water decomposition tower enters a waste water vaporization tower and then is subjected to heat recycling and cooled to obtain waste water at 45-60 DEG C; and the low-temperature water at 7-20 DEG C is used for cooling the waste water to obtain waste water at 15-30 DEG C. The waste water is used for washing tripolycyanamide vented tail gas and then recycled. According to the device and process, adding and discharging of system water are reduced, the amount of circulating cooling water used for cooling the recycled water is decreased, and energy saving and emission reduction are achieved.

Description

technical field [0001] The invention relates to a method for utilizing waste heat from melamine wastewater, in particular to a device and a process for reducing energy consumption and waste water discharge by utilizing melamine cyclically to recover hydrothermal energy, belonging to the field of energy conservation and emission reduction in chemical production. Background technique [0002] During the production of melamine, wastewater containing a small amount of melamine, oxidized aminotriazine (OAT) and ammonia will be generated, which needs to be recycled and discharged after wastewater decomposition and stripping. Current industry design methods such as figure 1 The details are as follows: after the temperature of the recycled water in the waste water decomposition tower drops to 160-170 °C after heat recovery, the temperature of the circulating cooling water is directly lowered to about 60 °C and enters the recycling water tank; and the water in the waste water strippi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B15/06F28F19/00B01D53/14
CPCB01D53/14B01D2252/103B01D2257/406F25B15/06F28F19/00
Inventor 杨晓勤卢钢
Owner 青海黎明化工有限责任公司