CN103936310A - Method used for improving cement raw material grindability and reducing TOC discharge with kitchen waste - Google Patents
Method used for improving cement raw material grindability and reducing TOC discharge with kitchen waste Download PDFInfo
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- CN103936310A CN103936310A CN201410062677.8A CN201410062677A CN103936310A CN 103936310 A CN103936310 A CN 103936310A CN 201410062677 A CN201410062677 A CN 201410062677A CN 103936310 A CN103936310 A CN 103936310A
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- raw material
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- grindability
- kitchen waste
- kitchen excess
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
- Y02P40/121—Energy efficiency measures, e.g. improving or optimising the production methods
Abstract
The invention discloses a method used for improving cement raw material grindability and reducing TOC discharge with kitchen waste. According to the method, the kitchen waste collected from municipal solid waste is mixed with raw materials which are used for preparing cement raw material; and an obtained mixture is delivered into a flour mill for grinding, wherein the outlet of the flour mill is provided with a gamma-Metric analyzer used for real-time monitoring on chemical components of the discharged cement raw material. According to the method, kitchen waste is added into a raw material grinding system so as to improve grindability of the cement raw material, and reduce power consumption of the flour mill; ash obtained via combustion of the kitchen waste can be used for replacing clay raw material; TOC discharge of a cement production system is reduced at the same time; a large amount of organic substances with relatively heat value are obtained via drying of the kitchen waste, and are burnt in a preheater so as to generate heat energy, so that the temperature of waste gas is increased, and waste heat power generation is increased; the kitchen waste is subjected to low-temperature drying grinding, a large amount of residual heat energy obtained via cerement plant waste heat power generation is recycled, a kitchen waste dewatering problem is solved, and processing cost of the kitchen waste is reduced.
Description
Technical field
The invention belongs to cement slurry grinding technical field, relate in particular to and utilize domestic waste to improve raw material grindability and reduce cement production system TOC generation, reduce energy consumption and TOC quantity discharged.
Background technology
The main raw material of manufacturing Portland clinker comprises calcareous raw material, clayey raw material, ferro-controlling raw material etc.Because the mineral deposition age of various raw materials is different, its structure is also different, therefore, is had the grindability of different grades by the formulated raw material of different material.Adopt the different raw material of vertical mill grinding, usual method is by adjusting the operating parameters of Vertical Mill, to guarantee out that the fineness of mill raw material meets the control requirement of manufacture of cement, as adjusted the parameters such as grinding roller pressure, bed thickness, powder separating machine rotating speed, injection flow rate and mill ventilation amount of Vertical Mill.Guaranteeing same grinding fineness, the raw material of the same tonnage of grinding, the poor required power consumption of raw material of grindability will increase.For the raw material of difficult especially mill, except adjusting mill operating parameters, also adopt the raw material of the difficult mill of the good raw material substitution part of grindability to participate in raw material preparation.
Due to kitchen excess complicated components, its composition, along with different geographical, Various Seasonal all can have greatly changed, therefore, directly adds raw mill by the kitchen excess sorting out without fermentation or mummification, easily affects the steady running of grinding machine.External common way is that the remaining kitchen excess of domestic waste sorting is carried out to landfill or compost treatment; If the organic content in the excess of kitchen is higher, first carry out fermentative processing, to reclaim biogas and generate electricity, after fermentation, remaining part is carried out compost or landfill disposal again.
Domestic patent [CN201110221010.4] discloses process integration and the system thereof of a kind of municipal garbage pre-treatment and cement kiln comprehensive utilization of resources, its method need to be by after rubbish fermentation mummification 10～20d, remaining inert component is participated in to cement slurry preparation and enter raw mill, thereby avoid the interference of kitchen excess composition fluctuation to grinding machine.This patented technology be only to provide a kind of process domestic waste processing method, and squad of bodyguards's cement slurry production technology is brought improvement, and before processing needs rubbish to carry out fermentative processing, complex process.
In addition, contriver discloses a kind of method of utilizing New Type Dry-process Cement Production system to process domestic waste in the patent of the patent No. [2004100660883] of application in 2004, the method utilizes cement produced with the dry method production system effectively to process domestic waste (comprising kitchen excess, noncombustibles and combustiblematerials etc.), but the complicated components of domestic waste and have very large fluctuation with the variation of seasonal climate, brings difficulty to the production control of cement slurry.This patent also only provides a kind for the treatment of process of utilizing cement production system to carry out domestic waste, do not find that wherein kitchen excess can also effectively improve the quantity discharged of cement slurry grindability and reduction production system TOC, so do not relate to the improvement to cement slurry production technology.
In the < < cement kiln synergic processing solid waste pollution control criterion > > (GB30485-2013) that China has just promulgated, using total organic carbon (TOC) as pollution from exhaust emission thing, control first one of index, in 6.5 of this standard, point out that " when cooperative disposal solid waste, cement kiln and kiln tail bootstrap system aiutage total organic carbon (TOC) should not surpass 10mg/m because of the concentration that cooperative disposal solid waste increases
3.Still do not suppress at present the practical approach of TOC discharge both at home and abroad.
Summary of the invention
For the defect existing in prior art and technical problem, the invention provides a kind of method of utilizing kitchen excess to improve cement slurry grindability and reducing TOC quantity discharged, the method not only efficient recovery has been processed domestic waste, also improve the grindability of cement slurry, realized the energy-saving and cost-reducing of Vertical Mill; Also help simultaneously and reduce cement production system TOC quantity discharged
For solving the problems of the technologies described above, the present invention has adopted following technical scheme: a kind of method of utilizing kitchen excess to improve cement slurry grindability and reducing TOC discharge, after the kitchen excess that domestic waste is sorted out mixes with the required raw material raw material of preparation cement slurry, send into pulverizer and carry out grinding, the γ-Metric analyser that goes out to grind raw material chemical composition for Real-Time Monitoring is disposed in the outlet of described grinding machine.
As preferably, the addition of described kitchen excess is 5～10% of raw material raw material.
As preferably, described raw material raw material comprises Wingdale, clay and iron ore, and Wingdale account for 75～95% of raw material raw material weight.
Further improve, described kitchen excess and Wingdale first carry out pre-mixing and enter raw meal prepared from lime storehouse, then participate in raw material preparation.
That further, mixes with raw material raw material also comprises noncombustibles and a small amount of remaining combustiblematerials that domestic waste sub-elects; Wherein non-combustible be dregs, brick, watt, sand, stone, soil, glass etc., combustiblematerials is paper, phytoclasts, plastics or rubbery chip.Thereby when improving cement slurry grindability, can reclaim domestic waste and reduce municipal pollution.
Further, to account for the weight of kitchen excess, noncombustibles and combustiblematerials minimum be 60% to described kitchen excess.
The present invention enters vertical mill system by the kitchen excess after domestic waste sorting after controlling, and to improve the grindability of raw material, reduces the current consumption of Vertical Mill, suppresses the discharge of cement production system TOC simultaneously.Its grinding aid effect mainly comes from two aspects: one: owing to containing a certain amount of organic percolate in the excess of kitchen, the composition (as alcohols, amine, carboxylic-acid etc.) that wherein contains liquid grinding aid, in grinding process, these organic percolates have infiltrated in the microscopic checks of Wingdale, the closure that stops newborn crackle, promote the expansion of crackle, played the effect of grinding aid, make the grindability of raw material obtain improving largely.Its two, kitchen excess directly with Wingdale pre-mixing, more even, the grinding machine being conducive in grinding process is stablized.In raw material process for preparation, the ratio of Wingdale is generally 75%～90%, is a kind of composition of ratio maximum in raw material raw material; Method of the present invention is evenly delivered to kitchen excess at conveyor (3) and above mixes with Wingdale by endless belt conveyor (2), because kitchen excess contains a high proportion of moisture content, and there is certain cohesiveness and plasticity-, before entering Vertical Mill, kitchen excess fully mixes with Wingdale thus, compare with water spray in Vertical Mill, can more directly effectively change the flow state of material, make material in Vertical Mill, form stable material bed, thereby reduced or eliminated because of material bed slippage or the unstable energy consuming.In addition, because excess composition fluctuation in kitchen is larger, the present invention has adopted γ-Metric analyser (10) to carry out examinations to going out to grind the chemical composition of raw material, thereby realized dynamically adjusting in real time of raw material preparations, effectively overcome because of the impact of excess composition fluctuation in kitchen on raw ingredients fluctuation, met the control requirement of manufacture of cement to raw material rate value.
Be used for the raw material of manufacture of cement as the major parts such as Wingdale, clay belong to sedimentogeneous rock, the organic molecule wherein containing is mostly the small organic molecule below C40, common every production 1kg grog, and the organic carbon of being brought into by conventional raw material is 1.5g～6g.This part organism is especially below 350 ℃ in low-temperature heat process, and very easily cracking and volatilization form TOC.Its effect that suppresses TOC discharge of the present invention mainly comes from two aspects: one: organism major part contained in the excess of kitchen is high molecular polymer, at 350 ℃, be difficult to below decompose and volatilization, with kitchen excess Substitute For Partial raw material, by reducing the consumption of raw material, reduce the generation of TOC; Its two: the high molecular polymer in the excess of kitchen, micromolecular organism is had to network control effect, suppressed the volatilization of its low temperature, thereby suppressed the generation of TOC.
Beneficial effect: with respect to prior art, in the present invention, raw mill system adds kitchen excess to improve the grindability of raw material, and the power consumption of reduction raw mill, has suppressed the generation of TOC, and the lime-ash forming after kitchen excess burns can replace clayey raw material; Kitchen excess contains the organic substance that a large amount of calorific values is higher after drying simultaneously, in preheater internal heat generation burning, makes spent air temperture increase, and can improve cogeneration amount; Kitchen excess adopts oven drying at low temperature grinding technology, has recycled in large quantities the residual heat after Technology in Surplus Heat Power Generation of Cement Factory, has solved kitchen excess dehydration problem, reduces the production processing cost of kitchen excess.
Accompanying drawing explanation
Fig. 1 is that kitchen of the present invention excess enters the process flow diagram of Wingdale conveyor from storage hole;
Fig. 2 is the structural representation of cement raw material mill system of the present invention;
Fig. 3 is that the excess front and back, kitchen that add of the present invention enter to grind KH, the SM of raw material and the wave pattern of IM mean value (γ-Metric result);
Fig. 4 is the wave pattern that adds excess front and back, kitchen to go out to grind raw ingredients of the present invention.
Wherein, kitchen excess storage hole 1, endless belt conveyor 2, conveyor 3, raw meal prepared from lime storehouse 4, clayey raw material batch bin 5, ferriferous raw material batch bin 6, correction material batch bin 7, allotment computing platform 8, Vertical Mill 9, γ-Metric analyser 10, cyclone cylinder 11, dust-precipitator 12, chimney 13.
Embodiment
Below in conjunction with accompanying drawing and with specific embodiment, further illustrate the present invention.Should understand these embodiment and only for the present invention is described, is not used in and limits the scope of the invention, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present invention.
Embodiment 1
Lab scale test: small-sized Vertical Mill experiment porch, raw material feed quantity is 150kg/h, kitchen excess addition is 15kg/h.After the raw materials such as the raw refuse classification in city kitchen excess out and the required Wingdale of preparation raw material, clay, iron ore are fully mixed, sending into small-sized Vertical Mill experiment porch carries out grinding, and under equal conditions contrasts with the grinding experiment of not adding kitchen excess.Result shows: after adding kitchen excess, the power consumption of small-sized Vertical Mill experiment porch has reduced by 1.2 KWhs/ton of raw material.
Embodiment 2
, a cement clinker production line of 5000t/d, the raw material feed quantity of supporting Vertical Mill is 420t/h.Embodiment is as follows:
1), according to the requirement of raw material preparation in cement production process, determine the chemical composition of the kitchen excess that domestic waste sorts out; The chemical composition of domestic certain kitchen, city excess (butt, %) as shown in table 1 below:
Table 1
| Loss | SiO 2 | Al 2O 3 | Fe 2O 3 | CaO | MgO | K 2O | Na 2O | SO 3 | Cl - |
| 52.10 | 27.09 | 4.74 | 3.10 | 6.50 | 0.88 | 1.20 | 1.20 | 0.31 | 1.05 |
Result shows: the lime-ash main component that the burning of kitchen excess forms is afterwards SiO
2, can be used for replacing clayey raw material.
2) kitchen excess enters behind cement mill, is deposited in excess storage hole, kitchen 1, then by endless belt conveyor 2, enters Wingdale conveyor 3, and the addition of kitchen excess is mono-day operation 10～15h of 30t/h(), after mixing with Wingdale, enter raw meal prepared from lime storehouse 4;
3) after the according to target rate value preparation of Wingdale, kitchen excess, clayey raw material, ferriferous raw material, correction material, by conveyor, be delivered to Vertical Mill 9 and carry out grinding; Its rate target value is as shown in table 2 below:
Table 2
4) go out to grind raw meal powder after cyclone cylinder 11 separation, dust-precipitator 12 gather dust, by conveyor, be delivered to raw material homogenizing silo.On conveyor, be provided with γ-Metric analyser 10, to going out to grind the chemical composition of raw material, carry out Real Time Monitoring, and analytical results is fed back to allotment computing platform 8, allocate in real time the ratio of raw material, thereby overcome the impact that kitchen excess composition fluctuation causes raw material rate value fluctuation.
Add before and after the excess of kitchen, enter the material chemical composition of mill and the fluctuation situation (γ-Metric result) of rate value as shown in Figure 3.Comparison diagram 3 is not difficult to find out: add before and after the excess of kitchen, enter to grind the KH of raw material, the mean value of SM and IM there is no larger variation, but its fluctuating range changes to some extent, add after the excess of kitchen, the rate value fluctuating range that enters to grind raw material has increased slightly, but the self-acting control effect due to γ-Metric, accomplished the timely adjustment of chemical composition, the composition fluctuation that draws mill raw material is diminished, fluctuate consistent with the raw material rate value that goes out to grind that does not add kitchen excess, its fluctuation deviation is all within controlling the scope requiring, finally go out to grind the rate value of raw material as shown in Fig. 4 and table 3, meet and guaranteed the quality control requirement of manufacture of cement.
Table 3
5) effect finally obtaining: Vertical Mill economize on electricity reaches 0.81 KWh/ton of raw material, economize on electricity 1,800,000 degree/year; Water saving reaches 14～16 kg/ton raw material, economizes on water 3.5 ten thousand tons/year; Save 1.2 ten thousand tons/year of clayey raw materials; Increase cogeneration amount 3,000,000 degree/year, TOC quantity discharged reduces 40%.
Claims (6)
1. one kind is utilized kitchen excess to improve cement slurry grindability and reduces the method that TOC discharges, it is characterized in that: after the kitchen excess that domestic waste is sorted out mixes with the required raw material raw material of preparation cement slurry, send into grinding machine and carry out grinding, the γ-Metric analyser that goes out to grind raw material chemical composition for Real-Time Monitoring is disposed in the outlet of described grinding machine.
2. utilize according to claim 1 kitchen excess to improve cement slurry grindability and reduce the method that TOC discharges, it is characterized in that: the addition of described kitchen excess is 5～10% of raw material raw material.
3. utilize according to claim 2 kitchen excess to improve cement slurry grindability and reduce the method for TOC discharge, it is characterized in that: described raw material raw material comprises Wingdale, clay and iron ore, and Wingdale account for 75～95% of raw material raw material weight.
4. utilize according to claim 3 kitchen excess to improve cement slurry grindability and reduce the method that TOC discharges, it is characterized in that: described kitchen excess and Wingdale first carry out pre-mixing and enter raw meal prepared from lime storehouse, then participating in raw material preparation.
5. utilize according to claim 4 kitchen excess to improve cement slurry grindability and reduce the method for TOC discharge, it is characterized in that: the noncombustibles that also comprising of mixing with raw material raw material, domestic waste sub-elected and the combustiblematerials of a small amount of remnants; Wherein non-combustible be dregs, brick, watt, sand, stone, soil, glass etc., combustiblematerials is paper, phytoclasts, plastics or rubbery chip.
6. utilize according to claim 5 kitchen excess to improve cement slurry grindability and reduce the method for TOC discharge, it is characterized in that: it is 60% that described kitchen excess accounts for the weight of kitchen excess, noncombustibles and combustiblematerials minimum.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105776916A (en) * | 2016-03-13 | 2016-07-20 | 石家庄新华能源环保科技股份有限公司 | Low-carbon-emission cement production device |
| CN111659693A (en) * | 2019-03-07 | 2020-09-15 | 东莞市金铭信息技术咨询有限公司 | Non-combustible processing system |
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| CN1623698A (en) * | 2004-12-17 | 2005-06-08 | 中材国际工程股份有限公司 | Process for treating urban house refuse using dry method cement production system |
| CN1644551A (en) * | 2004-12-17 | 2005-07-27 | 中材国际工程股份有限公司 | Method for inhibiting urban house refuse fermentation |
| CN2778417Y (en) * | 2005-03-07 | 2006-05-10 | 中材国际工程股份有限公司 | Device for treating urban domestic refuse by means of wet method cement production system |
| CN102218433A (en) * | 2011-03-24 | 2011-10-19 | 华新环境工程有限公司 | Municipal refuse drying system |
-
2014
- 2014-02-24 CN CN201410062677.8A patent/CN103936310B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1623698A (en) * | 2004-12-17 | 2005-06-08 | 中材国际工程股份有限公司 | Process for treating urban house refuse using dry method cement production system |
| CN1644551A (en) * | 2004-12-17 | 2005-07-27 | 中材国际工程股份有限公司 | Method for inhibiting urban house refuse fermentation |
| CN2778417Y (en) * | 2005-03-07 | 2006-05-10 | 中材国际工程股份有限公司 | Device for treating urban domestic refuse by means of wet method cement production system |
| CN102218433A (en) * | 2011-03-24 | 2011-10-19 | 华新环境工程有限公司 | Municipal refuse drying system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105776916A (en) * | 2016-03-13 | 2016-07-20 | 石家庄新华能源环保科技股份有限公司 | Low-carbon-emission cement production device |
| CN111659693A (en) * | 2019-03-07 | 2020-09-15 | 东莞市金铭信息技术咨询有限公司 | Non-combustible processing system |
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| CN103936310B (en) | 2015-07-29 |
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