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Sand acid low-position waste heat recovery method and recovery system thereof

A waste heat recovery, low-level technology, applied in the field of sand acid low-level waste heat recovery method and its recovery system, can solve problems such as insufficient heat utilization, achieve the effects of less heat waste, increase dilution heat, and increase steam production rate

Pending Publication Date: 2021-04-06
XIANGYANG LOMON TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a low-level waste heat recovery method for sand acid and its recovery system to solve the above-mentioned technical problem of insufficient heat utilization in the existing sulfuric acid production heat recovery technology

Method used

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  • Sand acid low-position waste heat recovery method and recovery system thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This embodiment processes SO according to the following steps 2 converted to SO 3 After the gas:

[0035] (1) SO 2 converted to SO 3 Afterwards, two-stage spraying was used to absorb SO 3 , the primary spray uses high-temperature acid with a mass fraction of 99.3% and 200°C, and the secondary spray uses low-temperature acid with a mass fraction of 98.5% and 70°C;

[0036] (2) The high-temperature acid with a mass percentage of not less than 99.5% output by the primary spray tower is passed into the mixer and diluted with water to obtain high-temperature acid at about 260°C;

[0037] (3) The high-temperature acid diluted with water is sent to the evaporator, where it exchanges heat with the water in the evaporator to generate steam. The temperature of the high-temperature acid after heat exchange is 200°C. According to the concentration and the liquid level of each circulation tank, part of it is sent back to the first stage Spraying, part of which is cooled down st...

Embodiment 2

[0044] This embodiment processes SO according to the following steps 2 converted to SO 3 After the gas:

[0045] (1) SO 2 converted to SO 3 Afterwards, two-stage spraying was used to absorb SO 3 , the primary spray uses high-temperature acid with a mass fraction of 99.3% and 200°C, and the secondary spray uses low-temperature acid with a mass fraction of 98.5% and 70°C;

[0046] (2) The high-temperature acid with a mass percentage of not less than 99.5% output by the primary spray tower is passed into the mixer and diluted with water to obtain high-temperature acid at about 260°C;

[0047] (3) The high-temperature acid diluted with water is sent to the evaporator, where it exchanges heat with the water in the evaporator to generate steam. The temperature of the high-temperature acid after heat exchange is 200°C. According to the concentration and the liquid level of each circulation tank, part of it is sent back to the first stage Spraying, a part of the temperature is grad...

Embodiment 3

[0050] This embodiment processes SO according to the following steps 2 converted to SO 3 After the gas:

[0051] (1) SO 2 converted to SO 3 Afterwards, two-stage spraying was used to absorb SO 3 , the primary spray uses high-temperature acid with a mass fraction of 99.1% and 200°C, and the secondary spray uses low-temperature acid with a mass fraction of 98.5% and 70°C;

[0052] (2) High-temperature acid with a mass percentage of not less than 99.5% output from the primary spray tower is passed into the mixer and diluted with water to obtain high-temperature acid at about 250°C;

[0053] (3) The high-temperature acid diluted with water is sent to the evaporator, where it exchanges heat with the water in the evaporator to generate steam. The temperature of the high-temperature acid after heat exchange is 200°C. According to the concentration and the liquid level of each circulation tank, part of it is sent back to the first stage Spraying, part of which is cooled down step...

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Abstract

The invention discloses a sand acid low-level waste heat recovery method and a recovery system thereof, and belongs to the technical field of sulfuric acid production heat recovery, SO3 is absorbed by adopting two-stage spraying, high-temperature acid with the mass fraction of 99.1%-99.3% and the temperature of 190 DEG C or above is adopted for first-stage spraying, and low-temperature acid with the mass fraction of 98.5% and the temperature of 70 DEG C or below is adopted for second-stage spraying. The high-temperature acid with the mass fraction not lower than 99.5% output by a first-stage spray tower is introduced into a mixer, and water is added for dilution. The high-temperature acid diluted by adding water is sent to an evaporator and exchanges heat with water in the evaporator to generate steam, the high-temperature acid is sent for the second-stage spraying after being cooled step by step, and the step-by-step cooling process comprises the steps that acid coming out of the evaporator is sequentially introduced into a medium-pressure feed water heater, a low-pressure steam feed water heater and a desalted water heater. The high-temperature acid sequentially exchanges heat with water in the medium-pressure feed water heater, the low-pressure steam feed water heater and the desalted water heater, and the desalted water sequentially enters the evaporator after being heated by the desalted water heater, the low-pressure steam feed water heater and the medium-pressure feed water heater.

Description

technical field [0001] The invention belongs to the technical field of sulfuric acid production heat recovery, and in particular relates to a method for recovering low-level waste heat of sand acid and a recovery system thereof. Background technique [0002] The process of producing sulfuric acid from sulfur includes sulfur roasting, SO 2 converted to SO 3 , SO 3 Absorption and other processes, the heat generated by these three processes accounted for 56%, 19% and 25% of the total heat respectively. At present, in the production of sulfuric acid, only the high-level heat energy in the sulfur roasting process is used to produce superheated steam as a by-product, while for SO 2 converted to SO 3 , SO 3 The low-level thermal energy in processes such as absorption has not been fully utilized. [0003] Currently SO 2 converted to SO 3 Finally, the commonly used technical means are: acid cooling after acid suction, the temperature of high-temperature flue gas is as high as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22B1/16F22B1/18F28G9/00C01B17/80
CPCF22B1/16F22B1/18F28G9/00C01B17/806Y02P20/10Y02P20/129
Inventor 曾小林王国锋卢慧军周海生江勇
Owner XIANGYANG LOMON TITANIUM IND CO LTD
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