CN101797474A - Desulphurization system, method and the boiler of power plant that comprises this desulphurization system - Google Patents
Desulphurization system, method and the boiler of power plant that comprises this desulphurization system Download PDFInfo
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- CN101797474A CN101797474A CN 201010153035 CN201010153035A CN101797474A CN 101797474 A CN101797474 A CN 101797474A CN 201010153035 CN201010153035 CN 201010153035 CN 201010153035 A CN201010153035 A CN 201010153035A CN 101797474 A CN101797474 A CN 101797474A
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- desulfurization absorbent
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Abstract
The present invention relates to technology that the flue gas that boiler of power plant produces is carried out desulfurization, the boiler of power plant that relates more specifically to a kind of desulphurization system, method and comprise this desulphurization system.This desulphurization system comprises: the desulfurization absorbent storage facilities, and it is used to store desulfurization absorbent; The desulfurization absorbent conveying equipment is connected to the downstream of desulfurization absorbent storage facilities, is used for carrying the desulfurization absorbent of desulfurization absorbent storage facilities; Desulphurization absorbent, the downstream that it is connected to the desulfurization absorbent conveying equipment is used for the desulfurization absorbent from the desulfurization absorbent conveying equipment is supplied to desulphurization plant; This desulphurization system is characterised in that described desulfurization absorbent is that the municipal middle water lime coagulation is handled the waste pulp that produces.
Description
Technical field
The present invention relates to technology that the flue gas that boiler of power plant produces is carried out desulfurization, relate more specifically to the municipal middle water lime coagulation is handled the application as the desulfuration in furnace absorbent of the waste pulp that produces.
Background technology
In power production process, the consumption of cooling water accounts for 60～80% of power plant's total water consumption, therefore, can carry out advanced treating to the secondary treatment yielding water (middle water) of municipal sewage plant, so that be used as the supplementing water of power plant cooling water.Municipal sewage secondary treated wastewater reuse recirculated cooling water faces water quality inferiority, and is higher firmly temporarily, contains polluters such as ammonia nitrogen, phosphate and microorganism waste pulp, causes cooling water system chemistry and biological fouling easily, and causes problem such as equipment corrosion.The lime coagulation Processing Test shows, the lime coagulation method is carried out advanced treating to municipal middle water can effectively reduce basicity, carbonate hardness, turbidity in the water, organic matter and ammonia nitrogen also there is certain removal ability, this method operating cost is low, effluent quality is good, can guarantee stable, the safe operation of circulating cooling water of power plant system fully.
The lime treatment method is that to control out water ph value be 10.3～10.5 by adding milk of lime, carry out three reactions as shown in Figure 1, produce a large amount of CaCO3 crystallizations of various forms, reduce temporary hardness in the water, generate crystallization nuclei simultaneously and can also play cohesion, suction-operated other impurity; And the rising of the pH value that causes of milk of lime has also been created condition for ammonia nitrogen and phosphatic removal.
As shown in Figure 2, the figure shows the flow chart of municipal middle water lime coagulation treatment system.After municipal middle water comes water to add the bactericide clorox, directly enter pressure mixer, in pressure mixer, add flocculating agent (bodied ferric sulfate) and flocculation aid (PAM solution), the pressure mixer water outlet enters mechanical accelerating purifying pool, in depositing reservoir, add milk of lime, implement softening, flocculate and clarify process.The pH value of depositing reservoir water outlet is 10.3-10.5, turbidity＜15mg/L.The depositing reservoir water outlet enters single chamber single layer filter device after realizing that through steam-water separator carbonated drink is separated, and realizes filter process in filter, the delivery turbidity＜2mg/L of filter.The water outlet of filter enters in the pressure mixer to be added sulfuric acid to regulate pH value is 7.5-8.5.The pressure mixer water outlet enters in the soft water pond, and the water outlet of soft water pond is as circulating water system and Boiler water Feeding System system.And the spoil disposal of depositing reservoir is delivered to mud pit, is delivered to the continous way concentration basin by the spoil disposal delivery pump again and concentrates, and the mud after concentrating is delivered to centrifugal drier by sludge pump, the mud cake outward transport after processed.
As indicated above and with reference to Fig. 2, in order to solve mud (waste pulp) problem that municipal middle water lime treatment system produces, dewaterer need be set it is carried out dehydrating operations, thereby can consume quite a large amount of electric energy, and the outward transport of the mud cake after the processed also can cause the certain economic burden to power plant.Therefore, need a kind of method and system that can directly utilize the waste pulp of municipal middle water lime treatment system generation effectively, thereby save the operation of dehydration and mud cake outward transport, and then reduce power plant's production cost, increase economic efficiency.
Summary of the invention
The present invention is intended to address the above problem.For this purpose, the invention provides a kind of method and system that the flue gas that boiler of power plant is discharged is carried out desulfurization of being used for.This method and system can directly utilize the mud (waste pulp) of municipal middle water lime treatment system generation as desulfurization absorbent effectively, and need not to carry out dehydrating operations, and saved the amount of lime in the wet desulfurizing process significantly, therefore had considerable business economic benefit and social enviroment protection benefit.
Particularly, according to an aspect of the present invention, provide a kind of desulphurization system that is used for boiler of power plant, this desulphurization system comprises: the desulfurization absorbent storage facilities, and it is used to store desulfurization absorbent; The desulfurization absorbent conveying equipment, the downstream that it is connected to described desulfurization absorbent storage facilities is used for carrying the desulfurization absorbent of described desulfurization absorbent storage facilities; Desulphurization absorbent, the downstream that it is connected to described desulfurization absorbent conveying equipment is used for the desulfurization absorbent from described desulfurization absorbent conveying equipment is supplied to desulphurization plant; It is characterized in that described desulfurization absorbent is that the municipal middle water lime coagulation is handled the waste pulp that produces.
In a preferred embodiment, described desulphurization plant is a boiler furnace, and described desulphurization absorbent is arranged on the water-cooling wall of boiler-burner bottom-more particularly be arranged at least one waste pulp atomizer at 1-3 rice, lower floor burner bottom, be used for waste pulp is injected into the boiler furnace bottom with atomizing type.
In a preferred embodiment, described waste pulp atomizer is a multi-stage hybrid steam atomizing nozzle, and the atomizing pressure of described waste pulp atomizer, atomizing angle and range depend on the concentration and the size of burner hearth of waste pulp.
In a preferred embodiment, described desulphurization system also comprises the purging dredging system that can optionally be connected to described waste pulp atomizer, is used for according to predetermined condition described waste pulp atomizer being purged and dredging.
In a preferred embodiment, described desulphurization plant is a desulfuration absorbing tower, and described desulphurization absorbent is arranged on the shower group on the described desulfuration absorbing tower, is used for waste pulp is ejected in the described desulfuration absorbing tower.
According to another aspect of the present invention, provide a kind of boiler of power plant, this boiler of power plant is characterised in that and comprises desulphurization system mentioned above.
According to a further aspect of the invention, provide a kind of sulfur method that is used for boiler of power plant, this method comprises the steps: to be provided with the desulfurization absorbent storage facilities, and this desulfurization absorbent storage facilities is used to store desulfurization absorbent; The desulfurization absorbent conveying equipment is set, and this desulfurization absorbent conveying equipment is connected to the downstream of described desulfurization absorbent storage facilities, is used for carrying the desulfurization absorbent of described desulfurization absorbent storage facilities; Desulphurization absorbent is set, and this desulphurization absorbent is connected to the downstream of described desulfurization absorbent conveying equipment, is used for the desulfurization absorbent from described desulfurization absorbent conveying equipment is supplied to desulphurization plant; It is characterized in that described desulfurization absorbent is that the municipal middle water lime coagulation is handled the waste pulp that produces.
Description of drawings
By the detailed description of carrying out below in conjunction with accompanying drawing, present invention will become more fully understood for those skilled in the art, in the accompanying drawing:
Fig. 1 is the schematic diagram of the chemical reaction that takes place in the municipal middle water lime coagulation treatment system;
Fig. 2 is the schematic process flow diagram of municipal middle water lime coagulation treatment system;
Fig. 3 schematically shows the preferred implementation that is used for the desulphurization system of boiler of power plant according to of the present invention;
Fig. 4 shows the partial enlarged drawing according to boiler of power plant of the present invention, wherein schematically shows the associated components (the waste pulp atomizer of more specifically saying so) of waste pulp conveying equipment.
The specific embodiment
The municipal middle water waste pulp as desulfurization absorbent by desulfuration in furnace and stove after desulfurization form, its technological process chemical process is as follows:
A. sulphur is consolidated in the pyrolysis of stove inner absorbent, referring to the agstone that will be milled down to about 325 orders, to be ejected into the upper furnace temperature with Pneumatic transfer method be 900～1250 ℃ zone, and CaCO3 decomposes immediately and generates CaSO4 with SO2 and a spot of SO3 reaction in the flue gas.
CaCO3＝CaO+CO2
CaO+SO2+1/2O2＝CaSO4
CaO+SO3＝CaSO4
B. the desulfuration absorbing tower humidification activation is consolidated sulphur, the large-size thermal power plant basic configuration is used the smoke limestone wet desulphurization device at present, flue gas makes flue gas further obtain work of water sprinkling for better material moisture by the absorption tower of wet desulphurization device, free CaO generates Ca (OH) 2 with the water reaction that sprays in the unreacted flue gas in the internal furnace of absorption tower, SO2 generates CaSO3 with generating Ca (OH) 2 fast reactions, has part to be oxidized to CaSO4.
CaO+H2O＝Ca(OH)2
Ca(OH)2+SO2＝CaCO3+H2O
CaCO3+1/2O2＝CaSO4
Referring to Fig. 3 and Fig. 4, wherein Fig. 3 schematically shows the preferred implementation that is used for the desulphurization system of boiler of power plant according to of the present invention; And Fig. 4 schematically shows the partial enlarged drawing according to boiler of power plant of the present invention.Those skilled in the art are understood that easily, Fig. 3 and Fig. 4 only show preferred implementation of the present invention, true scope of the present invention obviously is not limited to this, under the situation that does not change the principle of the invention, those skilled in the art can make the various remodeling and the replacement scheme of illustrated embodiment, and these remodeling and replacement scheme all will fall within the scope of the present invention.The Reference numeral among Fig. 3 and Fig. 4 and the corresponding relation of associated components are as follows: 101 boiler furnaces; The continous way concentration basin of 102 municipal middle water lime coagulation treatment systems; 103 waste pulp storage pools; 104 cesspools; 10 waste pulp atomizers; 11 flowmeters; 12 jet chimneys; 13 compressed air pipings; 14 Hand-operated butterfly valves; 15 electric control valves; 16 pipe flushing pumps; 17 manual check-valves; 18 sludge pumps; 19 flushing pipes; 20 agitators; 21 waste pulp delivery pumps; 22 sewage vent lines; 23 sewage pumps; 24 mud, waste pulp conveyance conduit; 25 water-cooling walls; 26 slag buckets; The center line of X-X ' lower floor burner.
The waste pulp that municipal middle water lime coagulation treatment system produces is that waste pulp with concentration 2-5% in the continous way concentration basin 102 is delivered in the waste pulp storage pool 103 by sludge pump 18 as the desulfurization absorbent of boiler of power plant, waste pulp needs regularly to stir to prevent precipitation with agitator 20, waste pulp in the waste pulp storage pool 103 is transported to the waste pulp atomizer 10 of (being lower floor's burner bottom 1-3 rice) on the water-cooling wall 25 of boiler-burner bottom through the waste pulp induction system by waste pulp delivery pump 21, waste pulp atomizer 10 is injected into waste pulp the bottom of boiler furnace 101 with atomizing type, the waste pulp of atomizing contacts with the high-temperature ash (＞850 ℃) that pulverized coal firing boiler falls, directly impel waste pulp stream to produce with red-hot flue gas and mix strongly, moisture evaporates rapidly.Flue gas after the waste pulp evaporation and calcium carbonate granule are because little suction function of burner hearth system; rise through the combustion zone of burner hearth along boiler furnace 101; air-flow is subjected to the radiation of burner hearth wall and thermal-flame again; thereby the calcium carbonate granule that will be suspended in the air-flow heats rapidly; calcium carbonate granule has obtained enough heats and has reached uniform temperature (1500-1800 ℃) thereby the generation pyrolytic; make calcium carbonate decompose into calcium oxide; and with sulfur in smoke generation vulcanization reaction; generate calcium sulfate, finally reach the purpose of desulfurization.
Dioxin and heavy metal pollution material in calcium carbonate granule and the water vapour are all decomposed, under the high temperature in the discarded object the main organic harmful components rate of destroying by fire can reach more than 99.999%, heavy metal in the calcium carbonate granule can stripping after high-temperature fusion yet, gas time of staying of whole high-temperature region (＞4S) long, its follow-up flue gas can capture the pernicious gas that remains in the flue gas through the washing of electrostatic precipitator and desulfuration absorbing tower, has guaranteed that the flue gas that discharges is thoroughly purified.
When carrying out the waste pulp nozzle atomization, in order to adapt to this special media applications of waste pulp, waste pulp atomizer 10 must possess good atomization characteristics, suitable atomizing pressure, atomizing angle and range.The atomizing difficulty of the waste pulp that the municipal middle water lime coagulation is handled is bigger, therefore preferably adopts multi-stage hybrid steam atomizing nozzle.Atomizing steam temperature 〉=300 ℃, first order atomizing are to impact waste pulp stream with the multilayer vapor stream, this moment the waste pulp surface moisture run into superheated steam after vaporization immediately form calcium carbonate granule group and steam mixture; Second level atomizing is mixture strong disturbance and repeatedly impact wall and make the further all even refinement cluster of grains of mixing in mixing chamber and shower nozzle; Third level atomizing is that mixture sprays under the effect of pressure reduction, and the acting in conjunction of volume of mixture rapid expanding while with burner hearth gas strong friction disperses calcium carbonate granule and pulverizing, finally obtains cluster of grains.If the employing mechanical atomization, then the vaporization of moisture all relies on heating in the stove in the lime coagulation processing waste pulp.
Therefore, CaCO in the lime coagulation Treating Municipal Sewage waste pulp burning process
3Have the effect of the sulphur of suction, make the SO in the combustion process
2And CaCO
3Biochemical reaction forms solid-state calcium sulfate (CaSO
4), attached on the dust or be condensed into fine particle and collected, so whole system has the reduction effect to the actual discharge concentration of sulfur dioxide by deduster.
According to the present invention, the waste pulp that municipal middle water lime coagulation treatment system produces is as desulfurization absorbent, can reduce the lime stone consumption of desulphurization system absorbent significantly, and the minimizing sludge discharge that municipal middle water produced, the running time of reducing the municipal middle water dewaterer significantly simultaneously, reduce the power consumption that municipal middle water is handled, and then reach the purpose that energy-conserving and environment-protective reduce cost of electricity-generating.
Although described technical scheme of the present invention above in conjunction with specific embodiments, yet the present invention is not limited to these embodiment, under the situation that does not change principle of the present invention and instruction, those skilled in the art can make multiple remodeling and modification within the scope of the invention.
Claims (10)
1. desulphurization system that is used for boiler of power plant comprises:
The desulfurization absorbent storage facilities, it is used to store desulfurization absorbent;
The desulfurization absorbent conveying equipment, the downstream that it is connected to described desulfurization absorbent storage facilities is used for carrying the desulfurization absorbent of described desulfurization absorbent storage facilities;
Desulphurization absorbent, the downstream that it is connected to described desulfurization absorbent conveying equipment is used for the desulfurization absorbent from described desulfurization absorbent conveying equipment is supplied to desulphurization plant;
It is characterized in that described desulfurization absorbent is that the municipal middle water lime coagulation is handled the waste pulp that produces.
2. desulphurization system as claimed in claim 1, wherein, described desulphurization plant is a boiler furnace, and described desulphurization absorbent is arranged on the water-cooling wall of boiler-burner bottom-more particularly be arranged at least one waste pulp atomizer at 1-3 rice, lower floor burner bottom, be used for waste pulp is injected into atomizing type the bottom of boiler furnace.
3. desulphurization system as claimed in claim 2, wherein, described waste pulp atomizer is steam atomization nozzle or atomizing nozzle or multi-stage hybrid steam atomizing nozzle, and the atomizing pressure of described waste pulp atomizer, atomizing angle and range depend on the concentration and the size of burner hearth of waste pulp.
4. as each described desulphurization system in the claim 1 to 3, also comprise the purging dredging system that can optionally be connected to described waste pulp atomizer, be used for described waste pulp atomizer being purged and dredging according to predetermined condition.
5. desulphurization system as claimed in claim 1, wherein, described desulphurization plant is a desulfuration absorbing tower, and described desulphurization absorbent is arranged on the shower group on the described desulfuration absorbing tower, is used for waste pulp is ejected in the described desulfuration absorbing tower.
6. a boiler of power plant is characterized in that comprising each described desulphurization system in the claim 1 to 5.
7. a sulfur method that is used for boiler of power plant comprises the steps:
The desulfurization absorbent storage facilities is set, and this desulfurization absorbent storage facilities is used to store desulfurization absorbent;
The desulfurization absorbent conveying equipment is set, and this desulfurization absorbent conveying equipment is connected to the downstream of described desulfurization absorbent storage facilities, is used for carrying the desulfurization absorbent of described desulfurization absorbent storage facilities;
Desulphurization absorbent is set, and this desulphurization absorbent is connected to the downstream of described desulfurization absorbent conveying equipment, is used for the desulfurization absorbent from described desulfurization absorbent conveying equipment is supplied to desulphurization plant;
It is characterized in that described desulfurization absorbent is that the municipal middle water lime coagulation is handled the waste pulp that produces.
8. method as claimed in claim 7, wherein, described desulphurization plant is a boiler furnace, and described desulphurization absorbent is arranged on the water-cooling wall of boiler-burner bottom-more particularly be arranged at least one waste pulp atomizer at 1-3 rice, lower floor burner bottom, be used for waste pulp is injected into atomizing type the bottom of boiler furnace.
9. method as claimed in claim 8, wherein, described waste pulp atomizer is steam atomization nozzle or atomizing nozzle or multi-stage hybrid steam atomizing nozzle, and the atomizing pressure of described waste pulp atomizer, atomizing angle and range depend on the concentration and the size of burner hearth of waste pulp.
10. method as claimed in claim 7, wherein, described desulphurization plant is a desulfuration absorbing tower, and described desulphurization absorbent is arranged on the shower group on the described desulfuration absorbing tower, is used for waste pulp is ejected in the described desulfuration absorbing tower.
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| CN 201010153035 CN101797474A (en) | 2010-04-16 | 2010-04-16 | Desulphurization system, method and the boiler of power plant that comprises this desulphurization system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113943072A (en) * | 2021-10-18 | 2022-01-18 | 华电水务工程有限公司 | Zero-discharge system and process for tail-end wastewater of direct-current cooling power plant |
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2010
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| CN1962034A (en) * | 2006-10-25 | 2007-05-16 | 华北电力大学 | Method and apparatus for removing sulfur, nitrate and mercury simultaneously from boiler flue gas |
| CN101655240A (en) * | 2009-09-14 | 2010-02-24 | 任振伟 | Sludge incinerating system, method and dried slag removing boiler for incinerating sludge |
Non-Patent Citations (2)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113943072A (en) * | 2021-10-18 | 2022-01-18 | 华电水务工程有限公司 | Zero-discharge system and process for tail-end wastewater of direct-current cooling power plant |
| CN113943072B (en) * | 2021-10-18 | 2024-03-08 | 华电水务工程有限公司 | Zero discharge system and process for tail end wastewater of direct-current cooling power plant |
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Application publication date: 20100811 |