CN104926073A - Method for preparing desulfurizer by utilizing municipal sludge - Google Patents
Method for preparing desulfurizer by utilizing municipal sludge Download PDFInfo
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- CN104926073A CN104926073A CN201510297574.4A CN201510297574A CN104926073A CN 104926073 A CN104926073 A CN 104926073A CN 201510297574 A CN201510297574 A CN 201510297574A CN 104926073 A CN104926073 A CN 104926073A
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Abstract
The invention discloses a method for preparing desulfurizer by utilizing municipal sludge. The method comprises the following steps: conducting high-pressure dehydration on the municipal sludge to obtain highly dried sludge; adding quicklime and an additive iron oxide into the highly dried and dehydrated sludge to ensure sludge calcification, and then carrying out mixing and stirring with a stirrer; conducting natural drying treatment and vibratory screening on the obtained mixture to obtain a granular product, namely the desulfurizer. The method provided by the invention has the advantages that as quicklime and iron oxide are added into the municipal sludge, the desulphurization efficiency is improved, and the calorific value of the municipal sludge can be utilized; the resource utilization of the municipal sludge is combined with in-furnace desulphurization, so that the treatment of a waste with another waste is realized.
Description
Technical field
The invention belongs to municipal sludge disposal technology field, be specially a kind of method of adding calcium oxide and additive and preparing sweetening agent in the deep dehydration mud of city.
Background technology
Municipal sludge is the product after municipal sewage treatment, is a kind of extremely complicated heterogeneous body be made up of organic relic, microorganism, inorganic particle, colloid etc.The main characteristic of mud is water ratio high (can up to more than 99%), and organic content is high, and easily corruption is smelly, and particle is comparatively thin, and proportion is less, jelly liquid, be the concentrated thing between liquid and solid, be difficult to carry out solid-liquid separation by sedimentation.The a large amount of hazardous and noxious substances contained in mud can produce huge harm to the mankind, animal health and environment, and therefore properly disposing sludge is particularly crucial.
In the last few years, municipal sludge disposed the important environmental issue having become countries in the world growing interest, and mud handling capacity is huge, shortage technology and equipment supports and remains the problem that need solve in sludge disposal problem.On the other hand, coal is as the current main energy sources of China, and burn the SO produced
2pollution problem receives increasing concern, reduces coal fire discharged SO
2the simplest method is desulfuration in furnace, and utilizing mud to prepare new and effective desulfuration in furnace agent becomes a new problem, and it is that the recycling of municipal sludge proposes a new thinking.
Summary of the invention
Technical problem: the invention provides a kind of recycling realizing municipal sludge, the municipal sludge that utilizes that the sweetening agent specific surface area made is large, desulfuration efficiency is high prepares the method for sweetening agent.
Technical scheme: the method utilizing municipal sludge to prepare sweetening agent of the present invention, comprises the following steps:
The first step, the municipal sludge height press-dehydrating that municipal wastewater process is produced, obtained high level cadre's dewatered sludge;
Second step, be 10% ~ 40% by CaO/DS mass percent, ferric oxide/DS mass percent is 5% ~ 7%, adds unslaked lime and ferric oxide additive, make mud calcification in high level cadre's dewatered sludge, adopt agitator mix and blend again, wherein DS is over dry mud;
3rd step, the mix products obtained by described second step carry out nature drying and other treatment;
4th step, carry out vibratory screening to the drying and other treatment product that described 3rd step obtains, the granular product obtained is sweetening agent.
Further, in the first step, municipal sludge water ratio is 80% to 97%, and obtained high level cadre's dewatered sludge water ratio is 60% to 65%.
Further, in the 3rd step, the water ratio of drying and other treatment after product is 25% to 30%.
Further, in the 4th step, the particle diameter obtaining granular product after vibratory screening is that 30 orders are to 40 orders
The present invention is by the municipal sludge of high level cadre's dehydration, add Wingdale and ferric oxide, add Wingdale, hazardous and noxious substances in mud can be eliminated, water in the calcium and the mud that add reacts heat production, and mud moisture content is reduced, and calcium further improves the natural mummification effect of mud, make final moisture percentage in sewage sludge be less than 30%, reach the effect of sludge stabilizing; Additive, through preferably, is chosen to be ferric oxide, and sweetening agent prepared by mud, in desulphurization reaction process, catalytic oxidation occurs, reduces reaction activity, improve desulfuration efficiency; Containing a certain amount of organism in municipal sludge, in high temperature desulfurizing process, the calorific value of mud obtains utilization.The recycling of mud combines with desulfuration in furnace by the present invention, achieves the treatment of wastes with processes of wastes against one another.
Beneficial effect: the present invention compared with prior art, has the following advantages:
The sulphur-fixing agent be commonly used at present in desulfurization technology is calcium oxide, and carbonate-free lime particle is spherical small-particle, assembles agglomerating; Pure mud granule surface relief is uneven, and specific surface area and porosity is larger; In the sweetening agent that the present invention obtains, calcium oxide particle is attached to the irregular surface of dewatered sludge, presents stratiform, calcium oxide and sulfurous gas contact area is increased, is more conducive to same SO
2gas contact and reaction, in high temperature desulfurizing reaction process, there is catalytic oxidation, reduce reaction activity, improve desulfuration efficiency further in additive ferric oxide;
The method rationally disposed from the angle municipal sludge of recycling economy has: (1) using after sludge treatment as fertilizer, carry out Land_use change; (2) after drying sludge for material of construction; (3) fuel is made, for generating.And municipal sludge is made sweetening agent, both can burn as fuel, increase again the effect of desulfuration in furnace, effectively can dispose municipal sludge, achieve and turn waste into wealth, be a new disposal options;
In the process preparing sweetening agent, CaO mixes with mud, not only eliminate hazardous and noxious substances in mud, also with the moisture generation chemical heat release in mud, cause moisture content in mud to be subject to thermal evaporation, moisture content in further reduction mud, calcium further improves mud nature mummification effect simultaneously, makes final moisture percentage in sewage sludge be less than 30%, reaches the effect of sludge stabilizing, greatly reduce sludge drying cost, solve moisture percentage in sewage sludge high-leveled and difficult in the bottleneck problem of recycling.
Conventional sweetening agent is calcium oxide, cannot burn, and does not have a calorific value, and with the sweetening agent that municipal sludge is prepared into, and sends into when burning together with coal in stove, not removing only sulphur, and the calorific value in mud can be utilized further.
Accompanying drawing explanation
Fig. 1 is inventive desulfurization agent preparation method schema.
Embodiment
Below in conjunction with embodiment and Figure of description, the present invention is further illustrated.
Embodiment 1
The first step, be the municipal sludge of about 80% by water ratio, be diluted to moisture about 90%, add the agent of high level cadre's dehydrating and conditioning, then at pressure be 1.6MPa diaphragm filter press under extrusion dehydration 30min, obtained high dewatered sludge, water ratio about 60%;
Second step, by CaO/DS mass ratio=10%, ferric oxide/DS mass ratio=5%, (DS is over dry sludge quantity) adds CaO and ferric oxide additive in high level cadre's dewatered sludge, then adopts stirring mixer to be uniformly mixed 20min;
The natural mummification under field conditions (factors) of 3rd step, mixture, temperature is down to normal temperature, and water ratio is about 25%;
4th step, carry out particle diameter screening, the particle collected between 30 orders to 40 orders is sweetening agent.
Embodiment 2
The first step, by water ratio 90% municipal sludge add amendment, pressure be 1.2MPa diaphragm filter press under extrusion dehydration 30min, obtained high dewatered sludge, water ratio about 65%;
Second step, by CaO/DS mass ratio=20%, ferric oxide/DS mass ratio=6%, adds CaO and ferric oxide additive, then adopts stirring mixer to be uniformly mixed 30min in obtained high dewatered sludge;
The natural mummification under field conditions (factors) of 3rd step, mixture, temperature is down to normal temperature, and water ratio is about 30%;
4th step, carry out particle diameter screening, the particle collected between 30 orders to 40 orders is sweetening agent.
Embodiment 3
The first step, by water ratio 97% municipal sludge add amendment, extrusion dehydration 40min under the air pressure type pressure filter that pressure is 1.4MPa, obtained high dewatered sludge, water ratio about 62%;
Second step, by CaO/DS mass ratio=40%, ferric oxide/DS mass ratio=7%, adds CaO and ferric oxide additive, then adopts stirring mixer to be uniformly mixed 25min in obtained high dewatered sludge;
The natural mummification under field conditions (factors) of 3rd step, mixture, temperature is down to normal temperature, and water ratio is about 28%;
4th step, carry out particle diameter screening, the particle collected between 30 orders to 40 orders is sweetening agent.
Recording through test, is temperature 900 DEG C, calcium to sulphur mole ratio Ca/S=2.0, SO at desulfurization condition
2when entrance concentration is 1%, calcium-based desulfurizing agent sulfur-fixing rate reaches 61%, 61.86%, 62% respectively, higher than carbonate-free lime sulfur-fixing rate with this understanding.
Above-described embodiment is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention; some improvement and equivalent replacement can also be made; these improve the claims in the present invention and are equal to the technical scheme after replacing, and all fall into protection scope of the present invention.
Claims (4)
1. utilize municipal sludge to prepare a method for sweetening agent, it is characterized in that, the method comprises the following steps:
The first step, the municipal sludge height press-dehydrating that municipal wastewater process is produced, obtained high level cadre's dewatered sludge;
Second step, be 10% ~ 40% by CaO/DS mass percent, ferric oxide/DS mass percent is 5% ~ 7%, adds unslaked lime and ferric oxide additive, make mud calcification in high level cadre's dewatered sludge, adopt agitator mix and blend again, wherein DS is over dry mud;
3rd step, the mix products obtained by described second step carry out nature drying and other treatment;
4th step, carry out vibratory screening to the drying and other treatment product that described 3rd step obtains, the granular product obtained is sweetening agent.
2. the method utilizing municipal sludge to prepare sweetening agent according to claim 1, is characterized in that: in the described the first step, and municipal sludge water ratio is 80% to 97%, and obtained high level cadre's dewatered sludge water ratio is 60% to 65%.
3. the method utilizing municipal sludge to prepare sweetening agent according to claim 1, is characterized in that: in the 3rd described step, and the water ratio of drying and other treatment after product is 25% to 30%.
4. the method utilizing municipal sludge to prepare sweetening agent according to claim 1, is characterized in that: in the 4th described step, and the particle diameter obtaining granular product after vibratory screening is that 30 orders are to 40 orders.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105110601A (en) * | 2015-10-13 | 2015-12-02 | 中国石油化工股份有限公司 | Method for preparing desulfurization agent from excess activated sludge |
| CN111606549A (en) * | 2020-05-12 | 2020-09-01 | 广东中林建筑园林工程有限公司 | Municipal sludge drying method |
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| CN101250456A (en) * | 2008-02-01 | 2008-08-27 | 刘志刚 | Technique for producing synthetic fuel by sludge of municipal sewage plant |
| CN201737917U (en) * | 2010-05-13 | 2011-02-09 | 焦永乐 | Equipment for synthesizing fuel with sludge |
| CN102212403A (en) * | 2011-05-13 | 2011-10-12 | 江苏欣法环保科技有限公司 | Method and device for preparing formed sludge fuel |
| CN102603152A (en) * | 2012-03-08 | 2012-07-25 | 佛山市环保技术与装备研发专业中心 | Sludge deep dehydration conditioning agent and application thereof |
| CN102658084A (en) * | 2012-05-18 | 2012-09-12 | 东南大学 | Preparation method of nickel nitrate modified sludge activated carbon |
| CN103537177A (en) * | 2013-10-30 | 2014-01-29 | 武汉钢铁(集团)公司 | Modified calcium-based desulfurizing agent for dry desulfurization of sintering gas and preparation method of modified calcium-based desulfurizing agent |
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2015
- 2015-06-03 CN CN201510297574.4A patent/CN104926073A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101250456A (en) * | 2008-02-01 | 2008-08-27 | 刘志刚 | Technique for producing synthetic fuel by sludge of municipal sewage plant |
| CN201737917U (en) * | 2010-05-13 | 2011-02-09 | 焦永乐 | Equipment for synthesizing fuel with sludge |
| CN102212403A (en) * | 2011-05-13 | 2011-10-12 | 江苏欣法环保科技有限公司 | Method and device for preparing formed sludge fuel |
| CN102603152A (en) * | 2012-03-08 | 2012-07-25 | 佛山市环保技术与装备研发专业中心 | Sludge deep dehydration conditioning agent and application thereof |
| CN102658084A (en) * | 2012-05-18 | 2012-09-12 | 东南大学 | Preparation method of nickel nitrate modified sludge activated carbon |
| CN103537177A (en) * | 2013-10-30 | 2014-01-29 | 武汉钢铁(集团)公司 | Modified calcium-based desulfurizing agent for dry desulfurization of sintering gas and preparation method of modified calcium-based desulfurizing agent |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105110601A (en) * | 2015-10-13 | 2015-12-02 | 中国石油化工股份有限公司 | Method for preparing desulfurization agent from excess activated sludge |
| CN111606549A (en) * | 2020-05-12 | 2020-09-01 | 广东中林建筑园林工程有限公司 | Municipal sludge drying method |
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