CN104645817A - Single-tower multi-pH-value graded spraying control desulfurization system and process - Google Patents
Single-tower multi-pH-value graded spraying control desulfurization system and process Download PDFInfo
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- CN104645817A CN104645817A CN201510079929.2A CN201510079929A CN104645817A CN 104645817 A CN104645817 A CN 104645817A CN 201510079929 A CN201510079929 A CN 201510079929A CN 104645817 A CN104645817 A CN 104645817A
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Abstract
The invention provides a single-tower multi-pH-value graded spraying control desulfurization system and single-tower multi-pH-value graded spraying control desulfurization process. The system comprises a desulfurization tower, a multi-pH-value graded spraying system, a gypsum slurry pool, an air oxidization system, a stirrer, a gypsum discharge pump, a circulating pump set, a two-phase high-efficiency static mixer, a pH value regulating agent conveying system and a multistage pH value regulating agent distribution system. The process based the system is characterized in that a pH value of slurry at the bottom of the desulfurization tower is controlled to be within 4.8-5.3, and multi-pH-value grading of a spraying layer of the multi-pH-value graded spraying system is realized by utilizing the multistage pH value regulating agent distribution system and the two-phase high-efficiency static mixer, wherein the formation of gypsum at the bottom of the desulfurization tower is not influenced when the desulfurization efficiency is improved to 99% or more. According to the single-tower multi-pH-value graded spraying control desulfurization system and the single-tower multi-pH-value graded spraying control desulfurization process, regional pH value control of a single-tower single circulation process is realized; the system and the process have the advantages that the system structure is simple, the floor area is small, the operation is stable, the transformation difficulty is low, and the investment is small.
Description
Technical field
The present invention relates to Flue Gas Desulfurization Technology of Power Plant field, particularly, relate to a kind of single tower many pH classified spraying and control desulphurization system and technique.
Background technology
SO to Thermal Power Generation Industry in " about printing and distributing < coal electricity energy-saving and emission-reduction upgrading and transformation action plan 2014-2020) notice of > " (send out and change No. [2014] 2093, the energy)
2emission request makes important written instructions, requires some areas, east coal unit SO
2discharge capacity is not higher than 35mg/Nm
3.This is compared with " general regional SO in " fossil-fuel power plant atmospheric pollutant emission standard " (GB13223-2011)
2discharge restriction 100mg/Nm
3below, some areas 50mg/Nm
3below " required raising by a relatively large margin.
At present, coal fired power plant flue gas desulfurization mainly adopts Gypsum Wet technique, and this technology is generally made up of pulping system, absorption tower system, Waste Water Treatment, gypsum dehydration system and other accessory system.Traditional wet desulfurizing process (single tower single cycle) its SO
2removal efficiency about 98%, as boiler combustion sulfur-bearing rate SO more than 0.8% or in flue gas
2concentration more than 1800mg/Nm
3time, this technique will be difficult to reach not higher than 35mg/Nm
3emission request.
In order to meet more and more stricter emission request, the basis of tradition list tower single circulation process creates the improving technique such as single tower Two-way Cycle and double tower Two-way Cycle.Though these technologies can meet 35mg/Nm substantially
3emission request, but the technique of complexity and structure, fluctuation of service, floor space is large, energy consumption is high, invest the defect such as large limits it to a certain extent and applies.The power plant particularly built well, needs to find out corresponding space again and complete single tower Two-way Cycle and the bicirculating improvement of double tower is very difficult, and effect work of the carrying major part of by chance desulfurization is the coal fired thermal power plant built up.
Therefore, on the basis of traditional sulfur removal technology, research and develop a kind of efficiency high, take up an area economize, the new and effective sulfur removal technology that reliable, energy consumption is low is coal fired thermal power plant energy-saving and emission-reduction problem demanding prompt solutions.
Summary of the invention
For defect of the prior art, the object of this invention is to provide a kind of single tower many pH classified spraying and control desulphurization system and technique, while reaching high desulfurization efficiency and project duration requirement, guarantee that unit operation is stablized, save and take up an area and investment.
According to an aspect of the present invention, a kind of single tower many pH classified spraying is provided to control desulphurization system, described system comprises desulfurizing tower, many pH classified spraying system, calcium plaster liquid pool, oxidation air system, agitator, gypsum excavationg pump, circulating pump group, two-phase high efficiency static mixer, pH adjusting agent induction system and multistage pH adjusting agent distribution system, wherein:
Described many pH classified spraying Operation system setting is in the middle and upper part of described desulfurizing tower;
Described calcium plaster liquid pool is arranged at the bottom of described desulfurizing tower;
Described oxidation air system and described agitator are arranged in described calcium plaster liquid pool;
Described gypsum excavationg pump is connected to the bottom sides of described calcium plaster liquid pool, and the gypsum that reacted pH adjusting agent and oxidation air haptoreaction generate discharges described desulfurizing tower by described gypsum excavationg pump;
Be connected by circulating pump group between described calcium plaster liquid pool with described many pH classified spraying system;
Described two-phase high efficiency static mixer is arranged between described circulating pump group and described calcium plaster liquid pool, for realizing the short distance Homogeneous phase mixing of pH adjusting agent and circulation gypsum slurries;
Described pH adjusting agent induction system is used for respectively to described desulfurizing tower and described multistage pH adjusting agent distribution system conveying pH adjusting agent;
Described multistage pH adjusting agent distribution system is connected with pipeline between described two-phase high efficiency static mixer and described calcium plaster liquid pool, described multistage pH adjusting agent distribution system for controlling the pH adjusting agent injection rate of the different spraying layers of described many pH classified spraying system, to reach the object of many pH classified spraying.
Preferably, be also provided with demister at the upper position of described many pH classified spraying system of described desulfurizing tower middle and upper part, described demister is for removing part droplet and particulate pollutant in neat stress.
Preferably, the middle and lower part of described desulfurizing tower is also provided with inlet flue duct, and pending former flue gas enters in described desulfurizing tower from described inlet flue duct; The top of described desulfurizing tower is also provided with exhaust pass, and neat stress is discharged from described exhaust pass after demister process.
Preferably, described multistage pH adjusting agent distribution system is made up of control valve group and delicate flow measurement mechanism; When calcium sulfur ratio is certain, by the desulfuration efficiency of the chain control realization more than 99% between control valve group and delicate flow measurement mechanism.
Preferably, every layer of spraying layer of described many pH classified spraying system all arranges the efficient homogeneous atomization spiral nozzle of some.
Preferably, the pH adjusting agent of described many pH classified spraying system can be the lime stone from described pH adjusting agent induction system, also can be Ca (OH)
2with the alkaline solution of NaOH.
Preferably, the pH value of described many pH classified spraying system is adjustable, and pH value progressively raises from bottom to top with described many pH classified spraying system.
According to another aspect of the present invention, provide a kind of and control sulfur removal technology based on single tower many pH classified spraying, described technique comprises the steps:
The first step, pending former flue gas is entered in desulfurizing tower from the inlet flue duct of the middle and lower part being arranged at desulfurizing tower;
Second step, SO from pH adjusting agent induction system
2pH adjusting agent divides two parts: wherein a part directly enters desulfurizing tower, for controlling pH in the calcium plaster liquid pool bottom desulfurizing tower in 4.8 ~ 5.3 scopes, another part then enters multistage pH adjusting agent distribution system, by the different spraying layer pH adjusting agent injection rates of the control valve group in multistage pH adjusting agent distribution system and delicate flow measurement mechanism system many pH classified spraying system, reach the object of many pH classified spraying, thus make SO
2removal rate is increased to more than 99%;
3rd step, under the effect of two-phase high efficiency static mixer, the high uniformity that pH adjusting agent and gypsum slurries can realize solid and liquid in short distance mixes;
Risen to the different spraying layers of many pH classified spraying system indescribably by circulating pump component after 4th step, pH adjusting agent mix from gypsum slurries, react with the former flue gas of adverse current after the uniform atomizing of efficient homogeneous atomization spiral nozzle, to remove the SO in former flue gas
2, obtain neat stress; Due to the raising of each spraying layer pH, the SO of more than 99% can be reached
2clearance;
The neat stress of the 5th step, generation through being arranged in the removing of the demister above many pH classified spraying system neat stress after part droplet and particulate pollutant, is discharged into chimney from the exhaust pass at desulfurizing tower top subsequently;
6th step, reacted pH adjusting agent fall in the calcium plaster liquid pool that is arranged at bottom desulfurizing tower, and under the effect of agitator, abundant haptoreaction generates gypsum with oxidation air, finally discharge desulfurizing tower, to do further process by gypsum excavationg pump.
Compared with prior art, the present invention has following beneficial effect:
The subregion pH that present invention achieves single tower single circulation process controls, and has that structure is simple, floor space is little, stable, transformation difficulty is low, the advantage of small investment.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is the overall system architecture schematic diagram of one embodiment of the invention;
In figure: desulfurizing tower 1, inlet flue duct 2, exhaust pass 3, calcium plaster liquid pool 4, lime stone slurry induction system 5, delicate flow measurement mechanism 6, control valve group 7, two-phase high efficiency static mixer 8, circulating pump group 9, many pH classified spraying system 10, efficient homogeneous atomization spiral nozzle 11, demister 12, oxidation air system 13, agitator 14, gypsum excavationg pump 15, multistage lime stone slurry distribution system 16.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.
In following examples, pH adjusting agent adopts lime stone slurry to be described specific embodiment of the invention, but in other embodiments, also can be Ca (OH)
2with the alkaline solution of NaOH.
Embodiment 1
As shown in Figure 1, list tower many pH classified spraying of the present invention controls desulphurization system one example structure schematic diagram, described system comprises: desulfurizing tower 1, inlet flue duct 2, exhaust pass 3, calcium plaster liquid pool 4, lime stone slurry induction system 5, delicate flow measurement mechanism 6, control valve group 7, two-phase high efficiency static mixer 8, circulating pump group 9, many pH classified spraying system 10, efficient homogeneous atomization spiral nozzle 11, demister 12, oxidation air system 13, agitator 14, gypsum excavationg pump 15, multistage lime stone slurry distribution system 16, wherein:
The top of described desulfurizing tower 1 arranges described exhaust pass 3; The middle and upper part of described desulfurizing tower 1 arranges described many pH classified spraying system 10 and described demister 12 from the bottom up respectively; The middle and lower part of described desulfurizing tower 1 arranges described inlet flue duct 2; The bottom of described desulfurizing tower 1 arranges described calcium plaster liquid pool 4; Be connected by circulating pump group 9 between described calcium plaster liquid pool 4 with described many pH classified spraying system 10; Described two-phase high efficiency static mixer 8 is arranged between described circulating pump group 9 and described calcium plaster liquid pool 4; Described multistage lime stone slurry distribution system 16 is connected with pipeline between described two-phase high efficiency static mixer 8 and described calcium plaster liquid pool 4; Described lime stone slurry induction system 5 is for carrying lime stone slurry respectively to described desulfurizing tower 1 and described multistage lime stone slurry distribution system 16; Oxidation air system 13 and agitator 14 is provided with in described calcium plaster liquid pool 4; Gypsum excavationg pump 15 is provided with bottom described calcium plaster liquid pool 4.
In the present embodiment, described multistage lime stone slurry distribution system 16 is made up of control valve group 7 and delicate flow measurement mechanism 6, by the actual measured value of delicate flow measurement mechanism 6 to the lime stone slurry added and the comparison of calculated value, determine the size of control valve group 7 aperture; When calcium sulfur ratio is certain, by the chain control in multistage lime stone slurry distribution system 16 between control valve group 7 and delicate flow measurement mechanism 6, realize the desulfuration efficiency of more than 99%.
In the present embodiment, each spraying layer of described many pH classified spraying system 10 is provided with several efficient homogeneous atomization spiral nozzles 11.
In the present embodiment, the pH value of described many pH classified spraying system 10 is adjustable, and pH progressively raises from bottom to top with described many pH classified spraying system 10.
In the present embodiment, described two-phase high efficiency static mixer 8 can realize the short distance Homogeneous phase mixing of lime stone slurry and circulation gypsum slurries.
Embodiment 2
The present embodiment provides a kind of single tower many pH classified spraying to control sulfur removal technology, and the step of described technique is as follows:
1, pending former flue gas enters in desulfurizing tower 1 from inlet flue duct 2;
2, the lime stone slurry from lime stone slurry induction system 5 divides two parts, wherein a part directly enters desulfurizing tower 1, for control pH value in the calcium plaster liquid pool 4 bottom desulfurizing tower 1 in 4.8 ~ 5.3 scopes, another part then enters multistage lime stone slurry distribution system 16, the control valve group 7 of multistage lime stone slurry distribution system 16 and delicate flow measurement mechanism 6 control the lime stone slurry injection rate of the different spraying layer of many pH classified spraying system by control signal, reach the object of many pH classified spraying, thus make SO
2removal rate is increased to more than 99%;
3, under the effect of two-phase high efficiency static mixer 8, the high uniformity that ducted lime stone slurry and gypsum slurries can realize solid and liquid in short distance mixes;
4, the lime stone slurry after mixing is promoted to the different spraying layers of many pH classified spraying system 10 respectively by circulating pump group 9, reacts, to remove the SO in former flue gas after the uniform atomizing of efficient homogeneous atomization spiral nozzle 11 with the former flue gas of adverse current
2obtain neat stress; Due to the raising of spraying layer pH each in many pH classified spraying system 10, the SO2 clearance of more than 99% can be reached;
5, neat stress removes in neat stress through demister 12 subsequently and is discharged into chimney from the exhaust pass 3 at desulfurizing tower 1 top after part droplet and particulate pollutant;
6, reacted lime stone slurry then falls into the calcium plaster liquid pool 4 bottom desulfurizing tower 1, the abundant haptoreaction of oxidation air discharged with oxidation air system under the effect of agitator 14 generates gypsum, finally discharges desulfurizing tower 1 by gypsum excavationg pump 15 and processes further.
As higher SO need be obtained
2removal efficiency, the pH adjusting agent (lime stone slurry) only multistage lime stone slurry distribution system 16 need injected changes the stronger Ca of reproducibility (OH) into
2with the alkaline solution of NaOH.
The subregion pH that present invention achieves single tower single circulation process controls, and has that structure is simple, floor space is little, stable, transformation difficulty is low, the advantage of small investment.
Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (10)
1. single tower many pH classified spraying controls desulphurization system, it is characterized in that, described system comprises desulfurizing tower, many pH classified spraying system, calcium plaster liquid pool, oxidation air system, agitator, gypsum excavationg pump, circulating pump group, two-phase high efficiency static mixer, pH adjusting agent induction system and multistage pH adjusting agent distribution system, wherein:
Described many pH classified spraying Operation system setting is in the middle and upper part of described desulfurizing tower;
Described calcium plaster liquid pool is arranged at the bottom of described desulfurizing tower;
Described oxidation air system and described agitator are arranged in described calcium plaster liquid pool;
Described gypsum excavationg pump is connected to the bottom sides of described calcium plaster liquid pool, and the gypsum that reacted pH adjusting agent and oxidation air haptoreaction generate discharges described desulfurizing tower by described gypsum excavationg pump;
Be connected by circulating pump group between described calcium plaster liquid pool with described many pH classified spraying system;
Described two-phase high efficiency static mixer is arranged between described circulating pump group and described calcium plaster liquid pool, for realizing the short distance Homogeneous phase mixing of pH adjusting agent and circulation gypsum slurries;
Described pH adjusting agent induction system is used for respectively to described desulfurizing tower and described multistage pH adjusting agent distribution system conveying pH adjusting agent;
Described multistage pH adjusting agent distribution system is connected with pipeline between described two-phase high efficiency static mixer and described calcium plaster liquid pool, described multistage pH adjusting agent distribution system for controlling the pH adjusting agent injection rate of the different spraying layers of described many pH classified spraying system, to reach the object of many pH classified spraying.
2. the single tower of one according to claim 1 many pH classified spraying controls desulphurization system, it is characterized in that, also be provided with demister at the upper position of described many pH classified spraying system of described desulfurizing tower middle and upper part, described demister is for removing part droplet and particulate pollutant in neat stress.
3. the single tower of one according to claim 1 many pH classified spraying controls desulphurization system, and it is characterized in that, the middle and lower part of described desulfurizing tower is also provided with inlet flue duct, and pending former flue gas enters in described desulfurizing tower from described inlet flue duct; The top of described desulfurizing tower is also provided with exhaust pass, and neat stress is discharged from described exhaust pass after demister process.
4. the single tower of one according to claim 1 many pH classified spraying controls desulphurization system, and it is characterized in that, described multistage pH adjusting agent distribution system is made up of control valve group and delicate flow measurement mechanism; When calcium sulfur ratio is certain, by the desulfuration efficiency of the chain control realization more than 99% between control valve group and delicate flow measurement mechanism.
5. the single tower of one according to claim 1 many pH classified spraying controls desulphurization system, and it is characterized in that, every layer of spraying layer of described many pH classified spraying system all arranges some efficient homogeneous atomization spiral nozzles.
6. the single tower of one according to claim 1 many pH classified spraying controls desulphurization system, and it is characterized in that, the pH adjusting agent of described many pH classified spraying system is the lime stone from described pH adjusting agent induction system, or Ca (OH)
2, NaOH alkaline solution.
7. the single tower of one according to claim 1 many pH classified spraying controls desulphurization system, and it is characterized in that, the pH value of described many pH classified spraying system is adjustable, and pH value progressively raises from bottom to top with described many pH classified spraying system.
8. single tower many pH classified spraying controls a sulfur removal technology, and it is characterized in that, described technique comprises the steps:
The first step, pending former flue gas is entered in desulfurizing tower from the inlet flue duct of the middle and lower part being arranged at desulfurizing tower;
Second step, divide two parts from the pH adjusting agent of pH adjusting agent induction system: wherein a part directly enters desulfurizing tower, for controlling pH value in the calcium plaster liquid pool bottom desulfurizing tower in setting range, another part then enters multistage pH adjusting agent distribution system; Control the different spraying layer pH adjusting agent injection rates of many pH classified spraying system, reach the object of many pH classified spraying;
3rd step, under the effect of two-phase high efficiency static mixer, the high uniformity that pH adjusting agent and gypsum slurries can realize solid and liquid in short distance mixes;
Risen to the different spraying layers of many pH classified spraying system indescribably by circulating pump component after 4th step, pH adjusting agent mix from gypsum slurries, react with the former flue gas of adverse current after the uniform atomizing of efficient homogeneous atomization spiral nozzle, to remove the SO in former flue gas
2, obtain neat stress;
The neat stress of the 5th step, generation through being arranged in the removing of the demister above many pH classified spraying system neat stress after part droplet and particulate pollutant, is discharged into chimney from the exhaust pass at desulfurizing tower top subsequently;
6th step, reacted pH adjusting agent fall in the calcium plaster liquid pool that is arranged at bottom desulfurizing tower, and under the effect of agitator, abundant haptoreaction generates gypsum with oxidation air, finally discharge desulfurizing tower, to do further process by gypsum excavationg pump.
9. the single tower of one according to claim 8 many pH classified spraying controls desulphurization system, and it is characterized in that, the pH in the calcium plaster liquid pool bottom described desulfurizing tower controls in 4.8 ~ 5.3 scopes.
10. the single tower of one according to claim 8 many pH classified spraying controls desulphurization system, it is characterized in that, described pH adjusting agent is the Ca (OH) that the pH adjusting agent of pH adjusting agent induction system or reproducibility are stronger
2with the alkaline solution of NaOH.
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| WO2017004923A1 (en) * | 2015-07-07 | 2017-01-12 | 沈阳化工大学 | Calcium carbonate/calcium hydrate-gypsum wet desulphurization and dedusting technique for flue gas |
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| CN112999857A (en) * | 2021-02-24 | 2021-06-22 | 大唐环境产业集团股份有限公司 | Regulation and control method and regulation and control system for wide-load limestone slurry supply system |
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