Device and method for improving steam generating rate of low-temperature waste heat recovery system for sulfuric acid

A low-temperature waste heat and recovery system technology, applied in chemical instruments and methods, sulfur compounds, sustainable manufacturing/processing, etc., can solve problems such as ineffective recovery of heat

Inactive Publication Date: 2014-02-19
俞向东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in the sulfuric acid production industry, a low-temperature heat recovery device has been installed in the dry suction section, and its main process is: 3 The process gas enters the high-temperature absorption tower, is absorbed by the spray acid in the tower, releases heat, and the acid temperature rises. The high-temperature concentrated acid is pumped and pressurized by the high-temperature circulating pump and sent to the evaporator to generate low-pressure steam. After the acid temperature decreases, it enters the mixer. Add water to reduce the acid concentration, and then send it to the high-temperature absorption tower to absorb SO 3 ;The acid produced by the device is connected from the circulating acid pipe at the outlet of the evaporator, and is supplied externally after being cooled by the feed water heater and desalted water heater.

Method used

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  • Device and method for improving steam generating rate of low-temperature waste heat recovery system for sulfuric acid
  • Device and method for improving steam generating rate of low-temperature waste heat recovery system for sulfuric acid
  • Device and method for improving steam generating rate of low-temperature waste heat recovery system for sulfuric acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] see figure 1 as shown,

[0037]The SO3-containing process gas is mixed with the secondary steam (with a pressure of 0.25±0.2MPa) produced by the second evaporator 9 at the entrance of the high-temperature absorption tower 1, and the SO3 in the process gas is absorbed by the circulating acid in the high-temperature absorption tower 1 to release heat Produce high-temperature concentrated sulfuric acid at 205±20°C. At this time, the low-grade heat in the secondary steam is converted into the heat of high-temperature concentrated sulfuric acid. The confluence of high-temperature concentrated sulfuric acid at the bottom of the tower enters the high-temperature circulation tank 2, and is sent to the high-temperature circulation pump 3 under pressure. Enter the evaporator 4 to generate (0.8±0.2MPa) low-pressure steam. After the concentrated sulfuric acid exits the evaporator 4, the acid temperature drops to 190±20°C to obtain the acid production of the system, and send a part ...

Embodiment 2

[0039] see figure 2 as shown,

[0040] The SO3-containing process gas is mixed with the secondary steam (with a pressure of 0.25±0.2MPa) produced by the second evaporator 9 at the entrance of the high-temperature absorption tower 1, and the SO3 in the process gas is absorbed by the circulating acid in the high-temperature absorption tower 1 to release heat Produce high-concentrated sulfuric acid at about 205±20°C. At this time, the low-grade heat in the secondary steam is converted into the heat of high-temperature concentrated acid. The confluence of high-temperature concentrated acid at the bottom of the tower enters the high-temperature circulation tank 2 and is pressurized by the high-temperature circulation pump 3. Send it to the evaporator 4 to generate (0.8±0.2MPa) low-pressure steam. After the concentrated sulfuric acid exits the evaporator, the acid temperature drops to 190±20°C to obtain the acid production of the system, and a part of the acid production of the sys...

Embodiment 3

[0042] see image 3 as shown,

[0043] The SO3-containing process gas is mixed with the secondary steam (with a pressure of 0.25±0.2MPa) produced by the flash tank 12 at the inlet of the high-temperature absorption tower 1, and the SO3 in the process gas is absorbed by the circulating acid in the high-temperature absorption tower 1, releasing heat to generate High-concentrated sulfuric acid at about 205±20°C. At this time, the low-grade heat in the secondary steam is converted into the heat of high-temperature concentrated acid. The confluence of high-temperature concentrated acid at the bottom of the tower enters the high-temperature circulation tank 2, and is sent to the high-temperature circulation pump 3 under pressure. Enter the evaporator 4 to generate (0.8±0.2MPa) low-pressure steam, and after the concentrated sulfuric acid exits the evaporator, the acid temperature drops to 190±20°C to obtain the acid production of the system. A part of the acid production is sent to ...

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Abstract

The invention discloses a device for improving a steam generating rate of a low-temperature waste heat recovery system for sulfuric acid, and provides a method for improving the steam generating rate of the low-temperature waste heat recovery system for sulfuric acid. According to the invention, high-temperature acid production heat of the low-temperature waste heat recovery system is used for generating secondary steam with lower pressure, the secondary steam is sent into a high-temperature absorption tower and serves as part of make-up water, latent heat of the secondary steam is brought back to the low-temperature waste heat recovery system to generate low-pressure steam with higher pressure, and the steam generating rate for low pressure steam production of the system can be increased from 0.45 t to about 0.57 t each time 1 ton of sulfuric acid is produced.

Description

technical field [0001] The invention relates to a device and method for improving the steam production rate of a sulfuric acid low-temperature waste heat recovery system. Background technique [0002] At present, in the sulfuric acid production industry, a low-temperature heat recovery device has been installed in the dry suction section, and its main process is: 3 The process gas enters the high-temperature absorption tower, is absorbed by the spray acid in the tower, releases heat, and the acid temperature rises. The high-temperature concentrated acid is pumped and pressurized by the high-temperature circulating pump and sent to the evaporator to generate low-pressure steam. After the acid temperature decreases, it enters the mixer. Add water to reduce the acid concentration, and then send it to the high-temperature absorption tower to absorb SO 3 ;The acid produced by the device is connected from the circulating acid pipe at the outlet of the evaporator, and is supplied ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/74
CPCY02P20/10Y02P20/129
Inventor 俞向东
Owner 俞向东
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