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A heat integrated device for ammonia distillation and desulfurization by using chemical products

A technology of heat integration and ammonia distillation, which is applied in the field of heat sources of H2S desorption towers, can solve problems not involving heat integration between towers, and achieve the effects of synchronous optimization of heat, reduction of heat load, and reduction of power consumption

Active Publication Date: 2014-07-23
DALIAN UNIV OF TECH
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Problems solved by technology

[0007] The above-mentioned patents mainly carry out energy-saving transformation of a single tower, and do not involve heat integration between towers

Method used

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  • A heat integrated device for ammonia distillation and desulfurization by using chemical products

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Embodiment 1

[0022] As shown in the attached figure, at H 2 A reboiler for ammonia distillation wastewater is added at the bottom of the S desorption tower, the shell side of the reboiler is connected with the bottom of the desorption tower, and the tube side of the reboiler is connected with the ammonia distillation wastewater after heat exchange. Under normal working conditions, the temperature of the desulfurization lean liquid at the bottom of the desorption tower is 55-60 °C, and the temperature of the ammonia steaming wastewater is 78-85 °C. 65°C.

[0023] For the existing process, the pipeline of the ammonia distillation tower overhead sub-contractor is modified to make it compatible with H 2 The bottom of the S desorption tower is connected, and the H is pumped 2 The desulfurization lean liquid at the bottom of the S desorption tower is sent to the shell side of the sub-contractor at the top of the ammonia distillation tower, and after heat exchange with the ammonia gas at the to...

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Abstract

The present invention discloses a heat integrated device which can be wildly used between an ammonia distillation process and a desulfurization process in coking industry. The device comprises a steam reboiler, a H2S desorption tower, an ammonia distillation tower, an ammonia distillation wastewater reboiler, and an ammonia dephlegmator. The bottom of the H2S desorption tower is connected to the dephlegmator at the top of the ammonia distillation tower, the bottom of the H2S desorption tower is connected to the ammonia distillation wastewater reboiler, a desulfuration barren solution at the bottom of the H2S desorption tower is heated by using an ammonia distillation wastewater heater and the dephlegmator at the top of the ammonia distillation tower, and the low temperature exhaust heat of the ammonia distillation wastewater and the latent heat of water vapor in the ammonia distillation tower are recovered. According to the invention, via heat integration among different units, gradient utilization of energy is achieved, reducing the quantity of shared works, water consumption of the whole plant, and operating costs.

Description

technical field [0001] The invention provides a heat recovery method that can be widely used in the coking industry, and relates to a heat integration technology between ammonia distillation and desulfurization devices, specifically using the waste heat of the ammonia distillation tower as H 2 S desorption tower heat source. Background technique [0002] In the process of chemical production recovery, the ammonia distillation process mostly adopts steam stripping to steam ammonia, the ammonia-rich water is discharged from the top of the tower after stripping and desorption, and the wastewater from ammonia distillation is discharged from the bottom of the tower. The temperature at the bottom of the ammonia distillation tower is usually around 105-108 °C. The ammonia distillation wastewater first exchanges heat with the ammonia-rich water after ammonia washing. After the heat exchange, the temperature of the ammonia distillation wastewater drops to 78-85 °C. After exchanging ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/20B01D53/14C01C1/02
Inventor 董宏光胡定华张毅赵国强于博
Owner DALIAN UNIV OF TECH
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