Device and method for producing magnesium sulfate

A technology of magnesium sulfate and desulfurization tower, applied in the direction of magnesium sulfate, energy input, etc., can solve the problems of difficult maintenance, high production cost per ton of ore, and too much steam consumed by magnesium sulfate, so as to save the operation cost of desulfurization and reduce the production cost. Effect

Active Publication Date: 2015-03-25
ZHONGJING ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By adopting the device and method of the present invention, by installing a heat exchanger in the flue for evaporation and concentration, no need to consume steam for concentration and crystallization in the production process of by-products, it can solve the problem that the current magnesium desulfurization waste liquid produces magnesium sulfate. The problems of higher production costs and increased desulfurization operating costs can also solve the problems of impurities in the magnesium sulfate products directly produced in the tower and the difficulty of system maintenance.

Method used

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  • Device and method for producing magnesium sulfate
  • Device and method for producing magnesium sulfate

Examples

Experimental program
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Effect test

specific Embodiment approach

[0055] use figure 1 Described device manufactures a specific embodiment of magnesium sulfate, and described method comprises the steps:

[0056] a. The flue gas enters the interior of the desulfurization tower 1 from the flue gas inlet 7 through the flue, and passes through the first-stage SO 2 Absorption spray layer 3, secondary SO 2 Absorption spray layer 4, three-stage SO 2 After the desulfurization absorption reaction is carried out in the absorption spray layer 5, it is finally dehydrated and defogged by the demister 6, and then directly discharged through the flue gas outlet 8 of the top chimney;

[0057] b. The absorption liquid pumped out by the slurry circulation tank 2 is filtered by the discharge pump 19 and filtered by the filter 18, and then enters the flue heat exchanger 13 for evaporation and concentration, and the crystal-containing material after evaporation and concentration is sent to the crystallization tank 14;

[0058] C, the solid-liquid mixture that ...

Embodiment 1

[0061] Example 1 Sintering machine flue gas desulfurization project

[0062] Step 1: Add industrial tap water to the magnesium oxide powder to make magnesium hydroxide slurry, and send it to the circulating slurry pool 2 at the bottom of the desulfurization tower 1 .

[0063] Step 2: Make the sintering machine flue gas (with an oxygen content of 13vt%) with a flow velocity of 2.5-3.5m / s and a temperature of 110-180°C enter the desulfurization tower 1 from the flue gas inlet 7 of the desulfurization tower 1 through the flue 12 .

[0064] Step 3: Pass Level 1 SO 2 Absorption circulation pump 9, secondary SO 2 Absorption circulation pump 10, three-stage SO 2 The absorption circulating pump 11 sends the slurry in the circulating slurry pool 2 into the first-stage SO2 Absorption spray layer 3, secondary SO 2 Absorption spray layer 4, three-stage SO 2 The absorption spray layer 5, after the absorption reaction, the slurry falls into the circulating slurry pool 2.

[0065] Ste...

Embodiment 2

[0078] Example 2 Coal-fired boiler flue gas desulfurization project

[0079] Step 1: Add industrial tap water to the magnesium oxide powder to make magnesium hydroxide slurry, and send it to the circulating slurry pool 2 at the bottom of the desulfurization tower 1 .

[0080] Step 2: Make the coal-fired boiler flue gas (with an oxygen content of 13vt%) with a flow velocity of 2.5-3.5m / s and a temperature of 110-180°C enter the desulfurization tower 1 from the flue gas inlet 7 of the desulfurization tower 1 through the flue 12 .

[0081] Step 3: Pass Level 1 SO 2 Absorption circulation pump 9, secondary SO 2 Absorption circulation pump 10, three-stage SO 2 The absorption circulating pump 11 sends the slurry in the circulating slurry pool 2 into the first-stage SO 2 Absorption spray layer 3, secondary SO 2 Absorption spray layer 4, three-stage SO 2 The absorption spray layer 5, after the absorption reaction, the slurry falls into the circulating slurry pool 2.

[0082] ...

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Abstract

The invention provides a device and a method for producing magnesium sulfate and specifically provides a device and method for producing the magnesium sulfate by use of waste heat of flue gas outside a magnesium oxide process-based desulfurization waste solution tower. The device comprises a desulfurizing tower, a flue, a heat exchanger, a crystallizer and a dryer; the heat exchanger is located at the periphery of at least one section of the flue to evaporate and concentrate a magnesium sulfate-containing solution from the desulfurizing tower under the action of the waste heat of flue gas. According to the device and the method for producing magnesium sulfate, concentration and crystallization are realized without consuming steam in the byproduct production process, and therefore, the byproduct production cost is reduced, the desulfurization operating cost is saved and the system maintenance difficulty is reduced under the premise that the normal desulfurization efficiency is guaranteed.

Description

technical field [0001] The invention relates to a device and method for producing magnesium sulfate, in particular to a device and method for producing magnesium sulfate by using waste heat of flue gas outside a magnesium oxide desulfurization waste liquid tower. The device and method of the present invention are especially suitable for coal-fired boilers, sintering machines, pellets, rotary kiln flue gas and other fields requiring flue gas desulfurization. Background technique [0002] Using magnesium oxide desulfurization process and preparing desulfurization waste liquid to generate magnesium sulfate by-product not only solves the problem of desulfurization gypsum produced by traditional calcium desulfurization, but also offsets the operation and maintenance costs of part of the desulfurization unit through the sale of magnesium sulfate by-products, from Compared with the traditional calcium method, it has greater market application advantages in terms of technology and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/40
CPCY02P20/129C01F5/40C01P2006/80
Inventor 童裳慧
Owner ZHONGJING ENVIRONMENTAL TECH CO LTD
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