CN107267250B - Boiler anti-contamination additive and preparation and application thereof - Google Patents
Boiler anti-contamination additive and preparation and application thereof Download PDFInfo
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- CN107267250B CN107267250B CN201710463168.XA CN201710463168A CN107267250B CN 107267250 B CN107267250 B CN 107267250B CN 201710463168 A CN201710463168 A CN 201710463168A CN 107267250 B CN107267250 B CN 107267250B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L9/00—Treating solid fuels to improve their combustion
- C10L9/10—Treating solid fuels to improve their combustion by using additives
Abstract
The invention relates to a boiler anti-contamination additive, and a preparation method and an application thereof, wherein the additive comprises the following components in parts by weight: MnWO425-35 parts; al (Al)3(SiO3)320-30 parts of a solvent; SiO 2210-20 parts; al (Al)2O35-15 parts of a solvent; cr (chromium) component2O310-20 parts; MnO21-10 parts. Compared with the prior art, the invention can effectively improve the ash melting point of the easily-contaminated fuel without changing the structure and the operation condition of the boiler, reduce the cohesiveness of the easily-contaminated fuel, obviously reduce the problems of slag bonding and ash deposition of the easily-contaminated fuel boiler for combustion, enhance the heat transfer effect of the heat exchange tube, reduce the smoke discharge loss of the boiler and improve the boiler efficiency; the ventilation power consumption is reduced, and the service power is saved; the risk that the normal operation of steam and water in the heating surface is influenced by the slag is effectively reduced, and the overheating and pipe explosion of the steam and water pipe are prevented; the corrosion of the slagging to the metal pipe wall is reduced. The invention aims at solving the problems of slag bonding and dust accumulation of fuels easy to contaminate and expands the application range of the boiler to the fuels easy to contaminate.
Description
Technical Field
The invention relates to the technical field of boilers, in particular to a boiler anti-contamination additive and preparation and application thereof.
Background
The energy structure of more coal, less gas and poor oil determines that coal is still the leading energy of China for a long time in the future. The thermal power plant is undoubtedly a large coal consumer, a considerable part of the thermal power plant is low-rank coal, and when the boiler burns the low-rank coal, serious ash accumulation and slag bonding are easily caused. As the ash has much higher thermal resistance than the metal wall, the heat transfer effect is reduced, the boiler smoke discharge loss is increased, the boiler efficiency is reduced, and the ventilation power consumption is increased. Meanwhile, the slag bonding has locality, so that the normal operation of steam and water inside the heating surface is influenced. Serious slag bonding can block a flue gas channel and a slag discharge port of a hearth, overheat a steam-water pipe and explode the pipe, and damage the continuous operation of equipment. Slagging also contributes to metal corrosion. In order to remove the slag, the boiler has to be shut down for maintenance frequently, the boiler is shut down for maintenance once every 3 months in short time, and the boiler is shut down for maintenance once every 6 months in long time, so that the continuous operation time of the boiler is greatly shortened, and huge economic loss is caused. Some boilers are also forced to operate at low loads for long periods of time to prevent slagging. Therefore, the ash deposition and slag bonding seriously affect the availability, output and safety of the boiler, and bring huge economic loss. Therefore, on the premise of not changing the structure and the operation condition of the boiler, it is very important to find a high-efficiency, energy-saving, low-cost and strong-adaptability boiler anti-pollution additive.
At present, the anti-contamination additive is various in types, and can be divided into 3 types according to the main components of the additive: with kaolinThe main anti-pollution additive, such as patent CN 102786998A, CN 104371790A, CN 104327903A, has good effect, but has large dosage, high transportation cost, slow effect and poor fuel adaptability, and the combined water evaporation and heat absorption of kaolin can reduce the boiler efficiency; with Cr2O3Chromium-based anti-contamination additives with the main components of the oxidant and the adsorbent, such as patent CN 104845698A, CN 104910996A, CN103060051A, although the effect is quick, the effect is general, and the fuel adaptability is poor, so the popularization is difficult; with Al2O3Pure substance and SiO2Pure substance-based oxide anti-contamination additives, such as patent CN 104371789A, CN 104745270A, CN 104164270A, have good effect but high raw material cost and poor fuel adaptability. Although the three anti-contamination additives have advantages, the application range of the anti-contamination additives is greatly limited due to the disadvantages of large dosage, high transportation cost, slow effect and poor fuel adaptability, and the anti-contamination additives are difficult to popularize in the true sense. Therefore, the research and development of the boiler anti-contamination additive with high efficiency, energy conservation, low cost and strong adaptability is very important.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the boiler anti-pollution additive which is high in efficiency, energy-saving, low in cost and strong in adaptability, and the preparation and the application thereof.
The purpose of the invention can be realized by the following technical scheme: the boiler anti-contamination additive comprises the following components in parts by weight:
MnWO4the anti-contamination effect is excellent, the ash melting point can be obviously improved, and the adaptability of the coal is excellent; al (Al)3(SiO3)3Shows good alkali metal conversion rate, can convert alkali metal into stable alkali metal aluminosilicate, and effectively reduces alkali metal corrosion and alkali metal contamination. MnWO4、Al3(SiO3)3、SiO2、Al2O3、Cr2O3、MnO2After combined use, the stain resistant agent more shows excellent stain resistant effect and excellent coal adaptability, and the mechanism is as follows: MnWO under high temperature condition4The high-melting-point tungsten compound is combined with part of inorganic elements in the ash to form a high-melting-point tungsten compound, so that the ash component is improved, the melting point of the ash is obviously improved, and meanwhile, unstable alkali metal compounds in the ash are combined with Al at high temperature3(SiO3)3、SiO2、Al2O3The reaction, alkali metal is converted into stable alkali metal aluminosilicate, further effectively reduces corrosion and contamination degree caused by alkali metal, and Cr in the formula2O3Has auxiliary effect, promotes the coke slag after the reaction to change from glass state to crystalline state, further leads the ash content to be rapidly formed, prevents the flowing coke slag from polluting the boiler, and MnO in the formula2The catalyst is used for catalyzing the anti-contamination reaction, so that the reaction rate is improved, the anti-contamination effect is stabilized, and the adaptability of the coal is improved.
A preparation method of the boiler anti-contamination additive comprises the following steps: the boiler anti-contamination additive is obtained by crushing the components and then uniformly mixing the components in parts by weight.
The components are crushed to a particle size of less than 200 μm.
The application of the boiler anti-contamination additive prepared by the preparation method is used for resisting contamination of a pulverized coal boiler or a fluidized bed boiler.
When the boiler is a pulverized coal boiler, the application comprises the following steps: the prepared additive and the fire coal are sent into a coal mill to be crushed and mixed, the obtained mixture is separated by a coarse powder separator and a fine powder separator in sequence, and then is stored and sent into a pulverized coal boiler through a powder feeding fan when in use.
When the boiler is a fluidized bed boiler, the application comprises the steps of: the prepared additive and desulfurizer powder are mixed and stored, and then are sent into a fluidized bed boiler through a powder feeding fan.
When the additive is applied, the weight ratio of the fuel to the additive in the pulverized coal fired boiler or the fluidized bed boiler is 100: (0.1 to 3).
Compared with the prior art, the beneficial effects of the invention are embodied in the following aspects:
(1) the patented formula has better anti-contamination effect and coal adaptability;
(2) simple preparation, simple application and wide application prospect.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Example 1
The preparation of the boiler anti-contamination additive of the invention comprises the following steps: the anti-soiling additive of this example is based on MnWO430 parts of Al3(SiO3)325 parts of SiO215 parts of Al2O310 portions of Cr2O315 parts of MnO25 parts by mass.
The preparation method comprises the following steps: the preparation method comprises the steps of crushing the components to the maximum particle size of less than 200 mu m, and then uniformly mixing the components in parts by mass.
The application method of the anti-staining additive comprises the following steps:
the prepared additive and the fire coal are fed into a coal mill together to realize the sufficient crushing and mixing of the fuel and the additive, and the mixture passes through a coarse powder separator and a fine powder separator in sequence and is finally stored in a coal storage bin and is fed into a boiler under the action of a powder feeding fan.
The using amount of the boiler anti-contamination additive is as follows: the mass ratio of the additive to the boiler fuel is 0.2: 100.
The boiler anti-contamination additive provided by the embodiment is applied to a certain 350MW lignite power station boiler (pulverized coal fired boiler), and the result shows that under the condition that a boiler system normally operates through long-time operation monitoring: the ash content is 93% in the form of alkali metal aluminosilicate, the measured ash melting point is 1507 ℃, the problems of ash deposition, slag bonding and heat exchange surface corrosion caused by alkali steam are reduced, the utilization efficiency of boiler equipment is improved, and the service life of the boiler is prolonged. The continuous operation time of the boiler reaches 273 days, and all operation data of the boiler are normal and stable.
Example 2
A formulation and preparation similar to example 1 was used, except that:
(1) the weight parts of the components are as follows: MnWO435 parts of Al3(SiO3)320 parts of SiO220 parts of Al2O315 portions of Cr2O320 parts of MnO210 parts of (A); (2) the additive obtained in the embodiment is used for a circulating fluidized bed boiler of a 135MW bituminous rock power station, and the mass ratio of the additive to the boiler fuel is 0.1: 100.
(3) The application method comprises the steps of mixing the prepared additive and the desulfurizer powder, storing the mixture in a desulfurizer bin, and then feeding the mixture into a fluidized bed boiler through conveying air.
Through practical tests, the ash content is 88% in the form of alkali metal aluminosilicate, the ash melting point is 1485 ℃, the problems of ash deposition, slagging and heat exchange surface corrosion caused by alkali steam are also reduced, the utilization efficiency of equipment is improved, and the service life of a boiler is prolonged. The continuous operation time of the boiler reaches 250 days, and all operation data of the boiler are normal and stable.
Example 3
A formulation similar to example 1, preparation and application methods were used, except that:
(1) the weight parts of the components are as follows: MnWO425 parts of Al3(SiO3)330 parts of SiO210 parts of Al2O35 parts of Cr2O310 parts of MnO21 part;
(2) the mass ratio of the additive to the boiler fuel is 3: 100.
Through practical tests, the ash content is 90% in the form of alkali metal aluminosilicate, the measured ash melting point is 1489 ℃, the problems of ash deposition, slag bonding and heat exchange surface corrosion caused by alkali steam are also reduced, the utilization efficiency of boiler equipment is improved, and the service life of the boiler is prolonged. The continuous operation time of the boiler reaches 266 days, and all the operation data of the boiler are normally stable.
Claims (7)
1. The boiler anti-contamination additive is characterized by comprising the following components in parts by weight:
MnWO425-35 parts;
Al3(SiO3)320-30 parts of a solvent;
SiO210-20 parts;
Al2O35-15 parts of a solvent;
Cr2O310-20 parts;
MnO21-10 parts.
2. A method for preparing the boiler anti-contamination additive according to claim 1, wherein the preparation method comprises the steps of: the boiler anti-contamination additive is obtained by crushing the components and then uniformly mixing the components in parts by weight.
3. The method of claim 2, wherein the components are pulverized to a particle size of less than 200 μm.
4. Use of the boiler anti-fouling additive obtained by the preparation method according to claim 2 or 3, wherein the additive is used for anti-fouling of a pulverized coal boiler or a fluidized bed boiler.
5. The use of a boiler anti-fouling additive according to claim 4, wherein, when the boiler is a pulverized coal boiler, the use comprises the steps of: the prepared additive and the fire coal are sent into a coal mill to be crushed and mixed, the obtained mixture is separated by a coarse powder separator and a fine powder separator in sequence, and then is stored and sent into a pulverized coal boiler through a powder feeding fan when in use.
6. The use of a boiler anti-fouling additive according to claim 4, wherein, when the boiler is a fluidized bed boiler, the use comprises the steps of: the prepared additive and desulfurizer powder are mixed and stored, and then are sent into a fluidized bed boiler through a powder feeding fan.
7. The use of a boiler anti-fouling additive according to claim 4, wherein the weight ratio of fuel to additive in the pulverized coal fired boiler or fluidized bed boiler is 100: (0.1 to 3).
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| CN107267250B true CN107267250B (en) | 2020-07-24 |
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| CN110107890B (en) * | 2019-04-02 | 2020-06-26 | 淄博齐林贵和热电有限公司 | Method for preventing circulating fluidized bed boiler from coking |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1105698A (en) * | 1994-01-20 | 1995-07-26 | 李小江 | Slag removing agent for solid fuel boiler |
| CN101475864A (en) * | 2009-01-19 | 2009-07-08 | 赵楠 | Non-sodium chloride environment-friendly type coal-saving combustion adjuvant special for cement |
| CN104164270A (en) * | 2014-07-24 | 2014-11-26 | 浙江百能科技有限公司 | Additive for improving Zhundong coal combustion and coking characteristics and use method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1111588C (en) * | 2000-07-21 | 2003-06-18 | 罗松涛 | Long-acting coal-saving comburant |
| JP2003082356A (en) * | 2001-09-07 | 2003-03-19 | Nippon Steel Corp | Apparatus and method for water-blowing into oven top space |
| CN1281725C (en) * | 2005-03-31 | 2006-10-25 | 中国民用航空学院 | Environmental protection energy-saving coal additives |
| CN103789060A (en) * | 2012-10-31 | 2014-05-14 | 临邑县鲁晶化工有限公司 | Novel combustion improver |
| CN105132075A (en) * | 2015-08-14 | 2015-12-09 | 上海理工大学 | Eastern Junggar coal slagging and contamination improvement additive and application method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1105698A (en) * | 1994-01-20 | 1995-07-26 | 李小江 | Slag removing agent for solid fuel boiler |
| CN101475864A (en) * | 2009-01-19 | 2009-07-08 | 赵楠 | Non-sodium chloride environment-friendly type coal-saving combustion adjuvant special for cement |
| CN104164270A (en) * | 2014-07-24 | 2014-11-26 | 浙江百能科技有限公司 | Additive for improving Zhundong coal combustion and coking characteristics and use method thereof |
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