Magnesium sulfate preparation system

A magnesium sulfate and pulping technology, applied in the direction of magnesium sulfate, etc., can solve the problems of crystal slurry transportation pipeline blockage, increase the floor area of ​​the device, increase the floor area, etc., to reduce system energy consumption, avoid pipeline blockage, The effect of saving floor space

Active Publication Date: 2014-02-19
ZHONGJING ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such a low oxygen content environment, the slurry mainly contains MgSO 3 Form exists, in order to produce the by-product magnesium sulfate heptahydrate, it is necessary to set up an oxidation fan with a large flow rate and an oxidation pool with a residence time of more than 10 hours, which increases the floor space and increases the energy consumption of the device, thus causing the use of magnesium oxide The production of magnesium sulfate heptahydrate from waste liquid produced by desulfurization requires high economic cost
Patent CN102631836A "New process for recovering magnesium sulfate heptahydrate from flue gas desulfurization of magnesium oxide", in the case of no oxygen balance and adjustment device at the front end, the converted MgSO 4 The amount is small, the conversion efficiency is about 40%, and the efficiency is too low to affect its economy
In addition, the crystallization method described in this patent is "air cooling crystallization". This crystallization method cannot control the size of crystal particles, and the product quality cannot be standardized.
[0004] There are other similar methods or processes, but as described in the two patents disclosed above, there are traditional impurity removal methods such as gravity sedimentation, which require a long residence time and a large equipment volume. , which inevitably causes the process to be unable to run continuously and increases the overall footprint of the device
Moreover, the magnesium sulfate solution is not suitable for the traditional method of concentrated crystallization. This method uses the characteristics of the solubility of magnesium sulfate to decrease when the temperature exceeds 60°C. This high-temperature crystallization method needs to consume more high-quality steam and will Causes frequent blockage of the slurry delivery pipeline, making it difficult to achieve continuous and stable production of by-products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Step 1: Add magnesium oxide powder to high-temperature condensed water from an evaporator at 60°C to make a magnesium hydroxide slurry, and pump it to the absorption tower.

[0057] Step 2: Control the oxygen content of the flue gas before desulfurization in Table 1 to 18% by using the flue gas oxygen content regulating device.

[0058] Step 3: The flue gas velocity at the entrance of the absorption tower is 3m / s, and the flue gas temperature at the entrance is 120°C. The pH value of the slurry tank area at the bottom of the absorption tower is controlled to fluctuate between 6 and 7 to obtain a magnesium sulfate solution.

[0059] Step 4: pass the magnesium sulfate solution through a precision filter of no less than 300 mesh filter media to achieve fine filtration of the magnesium sulfate solution.

[0060]Step 5: Set the temperature at 30°C and the density at 1.2t / m 3 The magnesium sulfate solution is sent to the three-effect evaporator for evaporation to obtain a t...

Embodiment 2

[0073] Under the same working conditions as in Example 1, step 2: utilize the flue gas oxygen content regulating device to control the flue gas oxygen content before desulfurization respectively at 23%, the desulfurization effect obtained and the magnesium sulfate output are as follows:

[0074] Table 423% Oxygen Desulfurization Project Emissions and Magnesium Sulfate Output

[0075] serial number

project

quantity

unit

1

Flue gas volume at the outlet of the desulfurization unit (working condition)

1384210

m 3 / h

2

exhaust temperature

50

℃

3

SO 2 emission concentration

<40

mg / Nm 3

4

Magnesium sulfate output

4.5

t / h

5

Magnesium Sulfate Quality

>98

% mass percentage

[0076] Magnesium sulfate quality and its test method are the same as in Table 3.

[0077] It can be seen from Examples 1 to 2 that the present invention utilizes the method for preparing...

Embodiment 3

[0079] Step 1: Add magnesium oxide powder to the condensed water of the boiler evaporation system at 60°C to make magnesium hydroxide slurry, and pump it to the absorption tower.

[0080] Step 2: Control the oxygen content of the flue gas before desulfurization in Table 5 at 18% by using the flue gas oxygen content regulating device.

[0081] Step 3: The flue gas velocity at the entrance of the absorption tower is 3m / s, and the temperature of the flue gas at the entrance is 118°C. The pH value of the slurry tank area at the bottom of the absorption tower is controlled to fluctuate between 6 and 7 to obtain a magnesium sulfate solution.

[0082] Step 4: pass the magnesium sulfate solution through a precision filter of no less than 300 mesh filter media to achieve fine filtration of the magnesium sulfate solution.

[0083] Step 5: Set the temperature at 30°C and the density at 1.2t / m 3 The magnesium sulfate solution is sent to the three-effect evaporator for evaporation to obt...

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Abstract

The invention discloses a magnesium sulfate preparation system. The system comprises a pulping device, a flue gas oxygen content adjusting device, a desulphurization device, a supplementary oxidation device, a filtering device, an evaporating device, a cooling crystallization device and a separator. The flue gas oxygen content adjusting device is used for controlling the oxygen content of a flue gas before desulphurization in a range of 15-25vt%; and the evaporating device and the cooling crystallization device are arranged in a separate manner. The method can simultaneously realize the efficient desulphurization of the magnesium oxide flue gas and the preparation of the high-quality magnesium sulfate product, and avoids the secondary pollution problem caused by landfill treatment of gypsum which is a common wet calcium method desulphurization byproduct.

Description

technical field [0001] The invention relates to a system for producing magnesium sulfate, in particular to a system for producing magnesium sulfate by using slurry after flue gas desulfurization. Background technique [0002] The desulfurization process based on the traditional limestone gypsum method has been widely used in the desulfurization industry. Desulfurization gypsum, a by-product of desulfurization projects, is difficult to reuse and forms solid waste, causing secondary pollution to the environment. In 2012, the thermal power plants of China's five major power companies produced 60 million tons of desulfurized gypsum. How to deal with these solid wastes has become a headache for various enterprises, governments at all levels, and environmental protection agencies. The reality that China is short of sulfur but not short of gypsum (gypsum) has made most environmental protection practitioners start to think about how to develop new desulfurization technologies that a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/40
Inventor 童裳慧
Owner ZHONGJING ENVIRONMENTAL TECH CO LTD
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