CN204865527U - Carbide slag desulfurization system - Google Patents
Carbide slag desulfurization system Download PDFInfo
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- CN204865527U CN204865527U CN201520494832.3U CN201520494832U CN204865527U CN 204865527 U CN204865527 U CN 204865527U CN 201520494832 U CN201520494832 U CN 201520494832U CN 204865527 U CN204865527 U CN 204865527U
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- carbide slag
- conveyer belt
- hopper
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Abstract
The utility model discloses a carbide slag desulfurization system, including the boiler having the circulation, driven the top of conveyer belt is equipped with the top baffle and lead to the conveyer belt of boiler feed inlet, and into coal scuttle is installed to the input that lies in the conveyer belt on the baffle of top, lies in into the delivery side of coal scuttle on the baffle of top and installs the carbide slag hopper, and the discharge gate below of carbide slag hopper is equipped with the metrological control system, and the discharge end of metrological control system is towards the conveyer belt, the hoist and mount of carbide slag above the hopper have can control the grab bucket of removing. The utility model has the advantages of reasonable design, utilizing the carbide slag as the desulfurizer, having saved the working costs widely, provide the economic base for desulfurization system can put into operation for a long time in succession, changing waste into valuables accords with circular economy and requires and national environmental protection policy, and the environmental protection is all good with economic benefits.
Description
technical field:
The utility model relates generally to field of environment protection, particularly relates to a kind of carbide slag desulfuration system.
background technology:
1. circulating fluid bed boiler desulfurization mechanism and influence factor
The desulphurization during combustion process of CFBB sends in stove by desulfurizing agent, and desulfurizing agent enters in stove first to calcine and generates calcium oxide, the sulfur dioxide gas precursor reactant that calcium oxide generates with fuel combustion again.The most frequently used desulfurizing agent is lime or lime stone, and its principle is the sulfur oxide haptoreaction that lime and coal combustion produce, and generates stable calcium sulfate.
CaCO
3(lime stone) → CaO+CO
2
CaCO
3, MgCO
3(dolomite) → CaO+MgO+2CO
2
Ca (OH)
2(calcium hydroxide) → CaO+H
2o
CaO+SO
2+1/2O
2→CaSO
4
Affect the major influence factors of desulfurization efficiency of circulating fluidized bed boiler: the impact of (1) Ca, S mol ratio.Ca, S mol ratio is considered to affect desulfuration efficiency and SO
2the primary factor of discharge, show according to test, when Ca, S mol ratio is 1.5 ~ 2.5, desulfuration efficiency is the highest, and when continuing to increase Ca, S mol ratio or desulfurization dosage, it is less that desulfuration efficiency increases, moreover, the input amount continuing to increase desulfurizing agent can bring other side effects, as increased physics heat loss, affects combustion conditions etc.(2) impact of bed temperature.The impact of bed temperature is mainly to change the reaction speed of desulfurizing agent, solid product distribution and pore plugging characteristic, thus affects the utilization rate of desulfuration efficiency and desulfurizing agent.Related documents shows, bed temperature controls, 850 ~ 900 DEG C time, can reach higher desulfuration efficiency.(3) impact of desulfurizing agent granularity, when adopting less desulfurizing agent particle diameter, desulfurizing agent specific area is large, and abundant with smoke contacts, desulfurized effect is good.General desulfurizing agent particle diameter chooses 0 ~ 2mm scope.(3) impact of circulating ratio.Circulating ratio is larger, and the recirculation of flying dust extends the time of staying of desulfurizing agent in bed, and improve the utilization rate of desulfurizing agent, desulfuration efficiency is higher.
utility model content:
The utility model object is exactly the defect in order to make up prior art, provides a kind of carbide slag desulfuration system, and it uses carbide slag as desulfurizing agent.
The utility model is achieved through the following technical solutions:
A kind of carbide slag desulfuration system, include boiler, it is characterized in that: include circulation transmission and lead to the conveyer belt of boiler feed mouth, the top of conveyer belt is provided with top spacer, input top spacer being positioned at conveyer belt is provided with coal feeding bucket, exit side top spacer being positioned at coal feeding bucket is provided with carbide slag hopper, is provided with metering control system below the discharging opening of carbide slag hopper, and the discharge end of metering control system is towards conveyer belt; Carbide slag hopper upper lifting has the grab bucket that can move left and right.
A kind of carbide slag desulfuration system, it is characterized in that: the inner side of described coal feeding bucket and carbide slag hopper is equipped with anticorrosive coat, coal feeding bucket and the outer of carbide slag hopper are all provided with bunker wall vibration device.
A kind of carbide slag desulfuration system, it is characterized in that: described metering control system includes belt weighing batcher and screw(-type) feeder, the discharging opening of carbide slag hopper is towards on the belt of belt weighing batcher, the feed end of the discharge end subtend screw(-type) feeder of belt weighing batcher, the discharge end of screw(-type) feeder is towards conveyer belt.
The utility model uses replacing carbide slag with lime masonry to be desulfurizing agent, has following analysis and feature thereof:
Carbide slag is calcium carbide (CaC in acetylene production process
2) and the rear (CaC of water reaction
2+ H
2o → Ca(OH)
2+ C
2h
2↑) industrial solid castoff that discharges, the main component of carbide slag is Ca(OH)
2, also have moisture and other impurity in addition, in pulpous state, process and transport comparatively difficulty.The carbide slag water content of firm discharge, 80% ~ 90%, can make moisture content drop to 30% ~ 40% after press filtration is stacked.
Checking utilizes carbide slag to be feasible as desulphurizer of boiler, without the need to transforming original steam generator system by experiment.To the utilization of useless carbide slag, not only reduce the pollution of these waste residues to environment, and open new approach for treatment of wastes with processes of wastes against one another comprehensive utilization of resources.Utilize carbide slag as desulfurizing agent, cost savings operating cost, provide economic base, turn waste into wealth for desulphurization system can put into operation for a long time continuously, meet recycling economy and require and national environmental protection policy, environmental protection and economy benefit is all good.
Table 1, table 2 be carbide slag domain size distribution and Analysis of Physical after stacking airing.
Table 1 carbide slag domain size distribution
| Particle diameter μm | <1.09 | <2.55 | <7.07 | <13.98 | <38.86 | <54.64 | <76.82 |
| Accumulative share % | 0 | 4.99 | 22.81 | 45.11 | 87.47 | 97.46 | 100 |
Table 2 carbide slag Analysis of Physical
| Project | Data |
| Water content % | 32 |
| CaO mass fraction % after conversion | 61.74 |
| Specific area m 2·g -1 | 45.2 |
Carbide slag particle diameter concentrates on 13.98 ~ 54.46 μm as can be seen from Table 1, and from the angle of desulphurization reaction, the advantage adopting granule desulfurizing agent is fairly obvious.Table 2 can find out that carbide slag has higher calcium content and specific area, and from physical property, carbide slag has larger specific area compared with conventional limestone desulfurizing agent, the SO more easily and in flue gas
2react.
Carbide slag is used for CFBB flue gas desulfurization as desulfurizing agent following advantage:
(1) utilize useless carbide slag as desulfurizing agent, no longer purchase lime stone, reduce the production cost of steam power plant.The granularity of carbide slag can reach desulfurization requirement, does not need powder manufacturing apparatus, decreases the operation and maintenance cost of equipment.
(2) carbide slag sulfur removal technology is simple, only needs a set of feed and conveying equipment, invests little, technically reliable, is convenient to regulation and control.
(3) the remaining ash content that burnt possesses making cement and the component needed for finished product compound completely, and is very low for the composition content of MgO that cement is harmful to.Due to CFBB belong to low-temperature burning (calcining heat 800 DEG C ~ 1400 DEG C) can complete cement formed in several thermochemical reaction process of less than 900 DEG C.Now, the calcic lime-ash obtained will be manufacture of cement " semi-mature material ", can be used for replacing part of cement raw material.
According to the principle of CFBB, in conjunction with on-the-spot actual, the desulfuration efficiency of desulphurization system should meet the requirement of current national discharge standard and Environmental Protection Agency, and considers to meet and be constantly tending towards strict SO from now on
2discharge standard
The production solid waste that the carbide slag source used produces for chemical plant.The carbide slag that chemical plant provides after press filtration water content about 40% ~ 50%, then through oven dry, the water content finally obtaining dry acetylene sludge powder can adjust between 1% ~ 10%.Angle of repose is the characterization parameter of powder granule mobility, can draw by carrying out mensuration to the angle of repose of different moisture content carbide slag, along with the angle of repose of the minimizing carbide slag of water content also reduces thereupon, show good mobility, the moisture carbide slag lower than 15% not easily occurs sticky stifled in conveying, storage process, can accurate feed proportioning.Control below 10% so the carbide slag that chemical plant provides dries whole moisture, such dry acetylene sludge powder viscosity is little, conveying feeding is convenient, can accurate-metering.
Special desulfurizing agent's feeding system is, ensure one of prerequisite of recirculating fluidized bed clean burning, the design of desulfurizing agent's feeding system rationally will be determined according to the quantity of boiler capacity and boiler body feeding point and position, and the layout of reasonable disposition system equipment and annex.Arrange according to boiler capacity, combustion parameter and coal handling system position and coal yard, adopt stokehold hybrid mode, namely in bunker coal course of conveying, add dry acetylene sludge powder desulfurizing agent, after carbide slag and coal dust mixing, send into hearth combustion.Concrete technology flow process is: in coal dust stockyard, a charging aperture opened by original coal conveyer belt upper spacer, external equipment hopper, carbide slag is delivered directly to coal supply belt by grab bucket through hopper, batcher, discharger, enter together with coal in stove burning and realize desulfurization, induction system can directly utilize original coal handling system.Frequency conversion type electronic scale is adopted to control the calcium carbide quantity of slag.
Carbide slag hopper size in the utility model: according to the on-the-spot Sizes design in steam power plant's raw coal stockyard, bucket location is located in coal conveyer belt top spacer, its top is wanted and driving grab bucket keeps certain safe distance, under ensureing that hopper has the prerequisite of larger angle, opening expands as far as possible, hopper inside lining anti-corrosive material, reduce carbide slag to the corrosiveness of hopper, make blanking smooth and easy simultaneously, bunker wall vibration device installed by the outer equal wall of coal feeding bucket and carbide slag hopper, ensures the smooth and easy of carbide slag blanking further.
Device for discharging is also had: the type selecting of device for discharging for foundation, ensures that carbide slag can fall from hopper smoothly with carbide slag consumption in the utility model.
Metering control system in the utility model: when moisture 15%, the loose volume weight of carbide slag is 600g/L, belong to light material, 1 ~ 50 micron particles is more than 80%, fine particles in carbide slag, the requirements of type selecting measuring accuracy high accuracy of measuring equipment is high, flexible adjustment, reliability and durability, selection ground is carbide slag conveying capacity.Consider the fluctuation of raw coal sulfur content, choose an assurance coefficient, the best desulfurization Ca/S of recirculating fluidized bed is between 1.5 ~ 2.5, the SO2 discharge standard limit that simultaneously looks to the future again strict further, according to the use amount of above condition determination carbide slag, and in conjunction with site space size, unit type is selected to be belt ashes dosing control system, this system is made up of belt weighing batcher and screw(-type) feeder, PLC is adopted to control, system stability, accurate measurement, weighing precision≤3%, moderate.
The utility model has the advantages that:
The utility model reasonable in design, utilizes carbide slag as desulfurizing agent, cost savings operating cost, economic base is provided for desulphurization system can put into operation for a long time continuously, turn waste into wealth, meet recycling economy and require and national environmental protection policy, environmental protection and economy benefit is all good.
accompanying drawing illustrates:
Fig. 1 is structural representation of the present utility model.
detailed description of the invention:
See accompanying drawing.
A kind of carbide slag desulfuration system, include boiler, include circulation transmission and lead to the conveyer belt 1 of boiler feed mouth, the top of conveyer belt 1 is provided with top spacer 2, input top spacer 2 being positioned at conveyer belt 1 is provided with coal feeding bucket 3, exit side top spacer 2 being positioned at coal feeding bucket 3 is provided with carbide slag hopper 4, is provided with metering control system below the discharging opening of carbide slag hopper 4, and the discharge end of metering control system is towards conveyer belt; Carbide slag hopper 4 upper lifting has the grab bucket 5 that can move left and right.
The inner side of coal feeding bucket 3 and carbide slag hopper 4 is equipped with anticorrosive coat, and coal feeding bucket 3 and the outer of carbide slag hopper 4 are all provided with bunker wall vibration device.
Metering control system includes belt weighing batcher 6 and screw(-type) feeder 7, the discharging opening of carbide slag hopper 4 is towards on the belt of belt weighing batcher 6, the feed end of the discharge end subtend screw(-type) feeder 7 of belt weighing batcher 6, the discharge end of screw(-type) feeder 7 is towards conveyer belt 1.
Claims (3)
1. a carbide slag desulfuration system, include boiler, it is characterized in that: include circulation transmission and lead to the conveyer belt of boiler feed mouth, the top of conveyer belt is provided with top spacer, input top spacer being positioned at conveyer belt is provided with coal feeding bucket, exit side top spacer being positioned at coal feeding bucket is provided with carbide slag hopper, is provided with metering control system below the discharging opening of carbide slag hopper, and the discharge end of metering control system is towards conveyer belt; Carbide slag hopper upper lifting has the grab bucket that can move left and right.
2. a kind of carbide slag desulfuration system according to claim 1, is characterized in that: the inner side of described coal feeding bucket and carbide slag hopper is equipped with anticorrosive coat, and coal feeding bucket and the outer of carbide slag hopper are all provided with bunker wall vibration device.
3. a kind of carbide slag desulfuration system according to claim 1, it is characterized in that: described metering control system includes belt weighing batcher and screw(-type) feeder, the discharging opening of carbide slag hopper is towards on the belt of belt weighing batcher, the feed end of the discharge end subtend screw(-type) feeder of belt weighing batcher, the discharge end of screw(-type) feeder is towards conveyer belt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520494832.3U CN204865527U (en) | 2015-07-08 | 2015-07-08 | Carbide slag desulfurization system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520494832.3U CN204865527U (en) | 2015-07-08 | 2015-07-08 | Carbide slag desulfurization system |
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|---|---|
| CN204865527U true CN204865527U (en) | 2015-12-16 |
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ID=54809963
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104984658A (en) * | 2015-07-08 | 2015-10-21 | 合肥热电集团有限公司 | Acetylene sludge desulfurization system |
| CN109420427A (en) * | 2017-09-04 | 2019-03-05 | 淮安市水泥厂有限公司 | A kind of processing method being used for desulphurization denitration using industrial residue alkaline residue substitution lime stone |
-
2015
- 2015-07-08 CN CN201520494832.3U patent/CN204865527U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104984658A (en) * | 2015-07-08 | 2015-10-21 | 合肥热电集团有限公司 | Acetylene sludge desulfurization system |
| CN109420427A (en) * | 2017-09-04 | 2019-03-05 | 淮安市水泥厂有限公司 | A kind of processing method being used for desulphurization denitration using industrial residue alkaline residue substitution lime stone |
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| GR01 | Patent grant |