CN103446871A - Light-calcined magnesia calcining furnace desulfurization technique and system - Google Patents
Light-calcined magnesia calcining furnace desulfurization technique and system Download PDFInfo
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- CN103446871A CN103446871A CN2013104061086A CN201310406108A CN103446871A CN 103446871 A CN103446871 A CN 103446871A CN 2013104061086 A CN2013104061086 A CN 2013104061086A CN 201310406108 A CN201310406108 A CN 201310406108A CN 103446871 A CN103446871 A CN 103446871A
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- calcining furnace
- desulfurizing tower
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- heat exchanger
- circulating slot
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Abstract
The invention provides a light-calcined magnesia calcining furnace desulfurization technique and system. The technique comprises steps as follows: light-calcined magnesia and water are added into a slurrying tank for slurrying, and the slurry enters a recycling tank; the slurry in the recycling tank is pumped to the top of a desulfurizing tower by a recycle pump and performs reflux absorption with fume which enters the bottom; the absorbed fume is discharged to air by a subsequent exhaust blower; the liquid on the bottom of the desulfurizing tower returns into a finned heat exchanger to be naturally cooled by an axial fan; the desulfurized solution enters the recycling tank; an air blower is additionally arranged in the recycling tank, and magnesium sulfite in the oxidizing solution also performs the function of further cooling; and when the solution concentration reaches 250 g/L, the solution is pumped to a magnesium cement construction material system to be used as a magnesium cement raw material. Only an ammonium chloride recycling process exists in the whole technical process, and thus, the technique is environment-friendly and clean.
Description
Technical field
The present invention relates to a kind of magnesite that utilizes and produce sulfur removal technology and system thereof in the light calcined magnesia process, belong to the comprehensive utilization field of nonmetal resource.
Background technology
At present, the equipment that utilizes the magnesite calcining to produce light calcined magnesia is mainly the methods such as calcining shaft kiln and rotary kiln, but mainly still take the calcining shaft kiln in actual production as main, on China Haicheng, Dashiqiao and other places, have hundreds of calcining shaft kilns, device structure is consistent, all adopt and take the direct-fired shaft kiln that hot dirty gas is fuel, its flow process comprises: magnesite is rejected assorted ore deposit through pretreatment, washing earth etc., the piece that is broken into 100-250mm rises to the shaft kiln top through lifting device, adds in bell, by bell, adds in kiln.Pass into air in gas generator bottom and steam produces coal gas in stove, enter shaft kiln bottom burner through dedusting, heat exchanger, and come in and go out air after preheating by air blast, same gas-fired, burn till material from drawing off at the bottom of kiln, carries out processing.The waste gas that calcining produces is discharged from the chimney at kiln top.Because chimney height generally only has 5 meters smells that therefore near chimney, can smell the sulfur dioxide of flue gas generation, environment is exerted an influence.At present at China Haicheng, In Dashiqiao Area hundreds of the such calcining furnaces that distributing, very large to local environmental disruption.But, because the industry profit is low, it is expensive that desulfurization provides, can produce secondary pollution after desulfurization in addition, most enterprises do not have the desulfurizer that can move.
Summary of the invention
The present invention seeks to be to provide a kind of light burnt powder calcining furnace sulfur removal technology and system thereof, utilize the self-produced light burnt powder of calcining furnace as desulfurizing agent, when the sulphur in flue gas is removed, the by-product Adlerika, solution is directly used in the production of magnesium cement building material, realized whole system flue gas qualified discharge, the material of by-product, as the raw material of other operations, forms the sulfur removal technology of a zero-emission simultaneously.
Another object of the present invention is the system of desulfurization.
One aspect of the present invention provides a kind of light burnt powder calcining furnace sulfur removal technology, and this technique comprises the following steps:
A. at first will grind in the above light calcined magnesia of 100 orders and adding of water stock tank and change slurry, the slurry after the change slurry enters in circulating slot.
B. the slurry in step a circulating slot being relied on circulating pump to squeeze into the desulfurizing tower top advances the flue gas entered with bottom and carries out counter-current absorption, flue gas after absorption is by the exhaust fan discharge atmosphere of back, and the liquid of desulfurizing tower bottom is got back in finned heat exchanger and relied on the axial flow blower machine naturally cooling.
C. the solution after step b desulfurization is entered in the circulating slot groove.Add air in circulating slot and agitate device, the magnesium sulfite in oxidizing solution plays further cooling left and right simultaneously, when solution concentration reaches 250 g/L, with pump, is delivered to the raw material of magnesium cement building material system as magnesium cement.
Light burnt powder content in step a is mainly magnesia, reaches more than 80%, wherein also contains a small amount of silica, iron oxide, calcium carbonate etc.The light burnt powder slurry that step b obtains step a and the sulfur dioxide in flue gas react.Liquid in circulating slot in step c is mainly magnesium sulfite machine Adlerika, with the further oxidation of air.Above-mentioned two reactions can be expressed by following equation:
Preferably, wherein said light burnt powder is the product of magnesite 950 ~ 1100 ℃ of calcinings, and content of magnesia is greater than 80%, changes the solid content 20 ~ 35% after the change slurry in stock tank.
Preferably, 95 ℃ of desulfurizing tower temperature in step b wherein, sulfur dioxide in flue gas is lower than 100 ppm.
Preferably, wherein in step c, the circulating slot temperature is 45-55 ℃, and final magnesium sulfate content is at 250 g/L, and magnesium sulfite content is less than 5g/L.
The process route that Fig. 1 is this technique.
The present invention provides a kind of system that realizes the inventive method on the other hand, and this system comprises 1, the light burnt powder calcining furnace; 2, desulfurizing tower; 3, exhaust fan; 4, finned heat exchanger; 5, axial flow blower; 6, axial flow blower; 7, circulating slot; 8, circulating pump; 9, change stock tank; 10, change stock pump, and, described light burnt powder calcining furnace 1 is connected to desulfurizing tower 2 bottom inlets, the desulfurizing tower gas vent is connected to the exhaust fan entrance, the liquid outlet of desulfurizing tower 2 is connected to the entrance of finned heat exchanger 4, and finned heat exchanger 4 outlets are connected to circulating slot top, axial flow blower 5,6 cooling fins heat exchangers, change stock tank 9 outlet connectionization stock pump 10 entrances, change the stock pump entrance and connect the circulating slot entrance.Referring to accompanying drawing 2, it is this system schematic.
While adopting the said equipment to carry out this technological process, at first will grind in the above light calcined magnesia of 100 orders and adding of water stock tank and change slurry, the slurry after the change slurry enters in circulating slot.Slurry in circulating slot relies on circulating pump to squeeze into the desulfurizing tower top to advance the flue gas entered with bottom and carry out counter-current absorption, flue gas after absorption is by the exhaust fan discharge atmosphere of back, and the liquid of desulfurizing tower bottom is got back in finned heat exchanger and relied on axial flow blower naturally cooling.Solution after desulfurization enters in the circulating slot groove.Add air in circulating slot and agitate device, the magnesium sulfite in oxidizing solution plays further cooling left and right simultaneously, when solution concentration reaches 250 g/L, with pump, is delivered to the raw material of magnesium cement building material system as magnesium cement.
Only have light burnt powder as desulfurization material in the whole technological process of the present invention, technique no liquid and solid waste discharge, be a typical eco-friendly cleaning procedure.
The accompanying drawing explanation
Below, describe by reference to the accompanying drawings embodiments of the invention in detail, wherein:
Fig. 1 is process route chart of the present invention.
Fig. 2 is the inventive method desulphurization system equipment, wherein this system comprise 1, the light burnt powder calcining furnace; 2, desulfurizing tower; 3, exhaust fan; 4, finned heat exchanger; 5, axial flow blower; 6, axial flow blower; 7, circulating slot; 8, circulating pump; 9, change stock tank; 10, change stock pump.
The specific embodiment
Embodiment 1
Take in the light burnt powder calcining furnace 1 that coal gas is thermal source, by the block magnesite of 50 ~ 120 mm, (its composition comprises: MgCO
382.38%, CaCO
38.81%, be more low-grade magnesite) from furnace roof, add, the high-temperature calcination temperature, 950 ~ 1100 ℃ of calcinings, obtains highly active light burnt powder, and the flue gas content that it effluxes (volume content %) is: N
2, 58.9%; CO
2, 31.8%; O
2, 1%; SO
2, 0.2%; Ar, 495ppm; H
2o, 8.2%.The output of calcining furnace is 3333 kg/h, wherein desulfurization per hour required light burnt powder be 50 kg/h, the slurry solid content is 25%, amount of slurry is 200 kg/h.SO in its flue gas after flue gas desulfurization
2amount is 45ppm, and the doctor solution internal circulating load is 30 m3/h, and 45 ℃, the flue gas after desulfurization temperature is increased to 61 ℃, has the water of 3% left and right to become steam.Through circular regeneration, reach 250 g/L at magnesium sulfate content, magnesium sulfite content is 4 g/L.
Embodiment 2
A kind of for realizing the system of above-mentioned light calcined magnesia calcining furnace sulfur removal technology, this system comprises 1, the light burnt powder calcining furnace; 2, desulfurizing tower; 3, exhaust fan; 4, finned heat exchanger; 5, axial flow blower; 6, axial flow blower; 7, circulating slot; 8, circulating pump; 9, change stock tank; 10, change stock pump, and, described light burnt powder calcining furnace 1 is connected to desulfurizing tower 2 bottom inlets, the desulfurizing tower gas vent is connected to the exhaust fan entrance, the liquid outlet of desulfurizing tower 2 is connected to the entrance of finned heat exchanger 4, and finned heat exchanger 4 outlets are connected to circulating slot top, axial flow blower 5,6 cooling fins heat exchangers, change stock tank 9 outlet connectionization stock pump 10 entrances, change the stock pump entrance and connect the circulating slot entrance.
Claims (6)
1. a light burnt powder calcining furnace sulfur removal technology, this technique comprises the following steps:
A. at first will grind in the above light calcined magnesia of 100 orders and adding of water stock tank and change slurry, the slurry after the change slurry enters in circulating slot;
B. the slurry in step a circulating slot being relied on circulating pump to squeeze into the desulfurizing tower top advances the flue gas entered with bottom and carries out counter-current absorption, flue gas after absorption is by the exhaust fan discharge atmosphere of back, and the liquid of desulfurizing tower bottom is got back in finned heat exchanger and relied on the axial flow blower machine naturally cooling;
C. the solution after step b desulfurization is entered in the circulating slot groove; Add air in circulating slot and agitate device, the magnesium sulfite in oxidizing solution plays further cooling left and right simultaneously, when solution concentration reaches 250 g/L, with pump, is delivered to the raw material of magnesium cement building material system as magnesium cement.
2. light burnt powder calcining furnace sulfur removal technology according to claim 1, wherein the light calcined magnesia in step a is self-produced from calcining furnace, more than particle diameter 100 orders.
3. light burnt powder calcining furnace sulfur removal technology according to claim 1 and 2, the desulfurization slurry content is 25%, along with internal circulating load raises, slurry content reduces gradually, finally is reduced to below 5%.
4. according to claim 1 or 2 or 3 described light burnt powder calcining furnace sulfur removal technologies, wherein said magnesium sulfate concentration is when 230-260 g/L, and solution enters magnesium cement building material system, and wherein magnesium sulfite is less than 5 g/L.
5. according to claim 1 or 2 or 3 or 4 described light burnt powder calcining furnace sulfur removal technologies, wherein said finned heat exchanger and circulating slot pass into air, the circulation fluid temperature can be reduced to 45 ℃, meet the circulation requirement.
6. one kind for realizing the system of the described light burnt powder calcining furnace of claim 1-5 any one sulfur removal technology, a kind of system that realizes the inventive method, this system comprises, the light burnt powder calcining furnace, desulfurizing tower, exhaust fan, finned heat exchanger, axial flow blower, axial flow blower, circulating slot, circulating pump, change stock tank, change stock pump, and, described light burnt powder calcining furnace is connected to the desulfurizing tower bottom inlet, the desulfurizing tower gas vent is connected to the exhaust fan entrance, the liquid outlet of desulfurizing tower is connected to the entrance of finned heat exchanger, the finned heat exchanger outlet is connected to the circulating slot top, axial flow blower, the cooling fins heat exchanger, change stock tank outlet connectionization stock pump entrance, change the stock pump entrance and connect the circulating slot entrance.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104446064A (en) * | 2014-12-03 | 2015-03-25 | 北京中晶佳镁环境科技股份有限公司 | Device and method for producing cement by virtue of flue gas desulfurization |
| CN104529205A (en) * | 2014-12-03 | 2015-04-22 | 北京中晶佳镁环境科技股份有限公司 | Cement production apparatus and method |
| CN104591568A (en) * | 2014-12-15 | 2015-05-06 | 北京中晶佳镁环境科技股份有限公司 | Magnesium sulfite cement and preparation method thereof |
| CN113440993A (en) * | 2020-03-24 | 2021-09-28 | 中国科学院过程工程研究所 | Purification system and purification method for organic silicon acid-containing waste gas |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1102357A (en) * | 1993-07-12 | 1995-05-10 | 三菱重工业株式会社 | Flue gas desulfurization method and system |
| JPH09271631A (en) * | 1996-04-04 | 1997-10-21 | Toyo Eng Corp | Desulfurization of exhaust gas |
| CN103239982A (en) * | 2013-05-24 | 2013-08-14 | 上海交通大学 | Method for dedusting and desulfurizing catalytic-cracking oil refining regenerated flue gas |
-
2013
- 2013-09-09 CN CN2013104061086A patent/CN103446871A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1102357A (en) * | 1993-07-12 | 1995-05-10 | 三菱重工业株式会社 | Flue gas desulfurization method and system |
| JPH09271631A (en) * | 1996-04-04 | 1997-10-21 | Toyo Eng Corp | Desulfurization of exhaust gas |
| CN103239982A (en) * | 2013-05-24 | 2013-08-14 | 上海交通大学 | Method for dedusting and desulfurizing catalytic-cracking oil refining regenerated flue gas |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104446064A (en) * | 2014-12-03 | 2015-03-25 | 北京中晶佳镁环境科技股份有限公司 | Device and method for producing cement by virtue of flue gas desulfurization |
| CN104529205A (en) * | 2014-12-03 | 2015-04-22 | 北京中晶佳镁环境科技股份有限公司 | Cement production apparatus and method |
| WO2016086733A1 (en) * | 2014-12-03 | 2016-06-09 | 童裳慧 | Apparatus and method for producing cement from flue gas desulphurisation |
| US10815153B2 (en) | 2014-12-03 | 2020-10-27 | Shanghui TONG | Apparatus and method for producing cement through flue gas desulfurization |
| CN104591568A (en) * | 2014-12-15 | 2015-05-06 | 北京中晶佳镁环境科技股份有限公司 | Magnesium sulfite cement and preparation method thereof |
| CN113440993A (en) * | 2020-03-24 | 2021-09-28 | 中国科学院过程工程研究所 | Purification system and purification method for organic silicon acid-containing waste gas |
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Application publication date: 20131218 |