CN105080328A - Out-tower oxidation method for limestone gypsum method wet type desulphurization, and desulphurization system of out-tower oxidation method - Google Patents
Out-tower oxidation method for limestone gypsum method wet type desulphurization, and desulphurization system of out-tower oxidation method Download PDFInfo
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- CN105080328A CN105080328A CN201410204494.5A CN201410204494A CN105080328A CN 105080328 A CN105080328 A CN 105080328A CN 201410204494 A CN201410204494 A CN 201410204494A CN 105080328 A CN105080328 A CN 105080328A
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Abstract
The invention discloses an out-tower oxidation method for limestone gypsum method wet type desulphurization, and a desulphurization system of the out-tower oxidation method. The flue gas enters a desulphurization tower from bottom to top; a circulating pump pumps the desulphurization liquid in the desulphurization tower for absorbing sulfur dioxide in the flue gas. The liquid desulfurized at tower bottom is forcibly oxidized in an oxidation tank, and then filtered by a filter, added with absorbing agents then returns back to the desulfurization tower. Out-tower oxidation, a jet-absorbing type oxidizer and an air distributor are combined so that oxidation efficiency of desulfurization liquid is largely promoted. A circuit that clear liquid returns to the tower is formed, thereby avoiding calcium sulfate sediment and resulting blocking. The flue gas is purged with water before going out of tower, which eventually resolves problems of the second pollution and unqualified flue dust emission. The desulfurization system has advantages of a simple and reasonable structure, low cost, easy implementation, and is easily generalized.
Description
Technical field
The invention belongs to technical field of desulfurization, be specifically related to a kind of tower external oxidation method of limestone-gypsum method wet type desulfurizing.
Background technology
Traditional desulfurization by lime gypsum method technique comprises serum producing system, the circulatory system, oxidative system, gypsum after-treatment system.Wherein oxidative system is made up of blower fan, oxidation spray gun etc.But there are two subject matters in this oxidative system: 1, oxidation efficiency is low.This process system blasts air by several oxidation spray guns to slurries in tower to reach oxidation with this, but oxidation spray gun is difficult to uniform distribution at the bottom of tower, so be difficult to fully oxidized for solution at the bottom of tower by oxidation spray gun merely.2, system easily blocks.Liquid after oxidation at the bottom of tower forms the calcium sulfate of indissoluble, and along with continuous accumulation, ducted calcium sulfate increases gradually, cause section of tubing gradually fouling even block, thus cause system by forced-stopping machine, impact is normally produced.3, fume emission dust content is higher, has secondary pollution problem.
Summary of the invention
For above-mentioned deficiency, the object of the invention is, provides a kind of technique simple, can greatly improve the oxidation efficiency of doctor solution and make there is not calcium sulfate sediment in tower, avoid the tower external oxidation method of the limestone-gypsum method wet type desulfurizing blocked.
The object of the invention is also, provides a kind of desulphurization system of the tower external oxidation method for implementing above-mentioned limestone-gypsum method wet type desulfurizing.
For achieving the above object, technical scheme provided by the present invention is:
A tower external oxidation method for limestone-gypsum method wet type desulfurizing, it comprises the following steps:
(1) flue gas enters desulfurizing tower from bottom to top;
(2) middle and upper part of desulfurizing tower squeezed into by doctor solution by circulating pump, with flue gas counter current contacting sulfur dioxide absorption from top to bottom;
(3) liquid after desulfurization at the bottom of tower is squeezed in oxidation trough by self-suction injection pump and is carried out forced oxidation;
(4) liquid after oxidized enters clean solution tank after filter filters;
(5) squeezed into the middle and upper part of desulfurizing tower after adding absorbent in clean solution tank by go back to liquid pump, realize the object recycled.
A kind of desulphurization system of the tower external oxidation method for implementing above-mentioned limestone-gypsum method wet type desulfurizing, it comprises desulfurizing tower, self-suction injection pump, oxidation trough, filter, clean solution tank, return liquid pump and circulating pump, the upper position of desulfurizing tower has installed upper nozzle and lower nozzle, this upper nozzle is connected with the water side of circulating pump, the water inlet end of this circulating pump is connected with the bottom of desulfurizing tower, the water inlet end of described self-suction injection pump is connected with the bottom of desulfurizing tower, the other end is connected with described oxidation trough, this oxidation trough, filter, clean solution tank, return liquid pump to be connected successively with lower nozzle.
As a modification of the present invention, described oxidation trough comprises cell body and multiple jet absorption type oxidator, and multiple jet absorption type oxidators are evenly plugged in the top of described cell body, are provided with air sparger in this cell body.Described jet absorption type oxidator comprises a body, and the upper end of this body is provided with a junction, this connecting portion is axially arranged with a doctor solution entrance and radial direction is provided with an air suction inlet, and one end that described body is connected with connecting portion is less, and middle part increases gradually.
As a modification of the present invention, described absorbent is lime stone slurry.
As a modification of the present invention, top also in desulfurizing tower is provided with water washing cleaning section and water washing cleaning hydrops section successively by order from top to bottom, this water washing cleaning hydrops section is provided with hydrops groove, described water washing cleaning section is provided with sprinkler head, and hydrops groove, clean solution tank, washing pump and sprinkler head are connected successively by water pipe and form water washing cycles loop.
Beneficial effect of the present invention is: the technique of method provided by the invention is simple, be easy to realize, adopt tower external oxidation mode, substantially increase the oxidation efficiency of doctor solution, simultaneously ingenious jet absorption type oxidator to be combined with air sparger, effectively ensure that fully contacting of air and doctor solution, promote oxidation effectiveness further, adopt clear liquid to return tower mode simultaneously and form closed circuit, under the filtration of filter, there is not calcium sulfate sediment, avoid occurring clogging, ensure operation working properly; But also carry out water purification washing again before flue gas goes out tower, thus the concentration of emission of flue dust is made significantly to drop to 10mg/Nm
3below, thoroughly solve the problem of secondary pollution and soot emissions problem not up to standard, significantly can also reduce the operating cost of bulk devulcanization system simultaneously.Desulphurization system of the present invention rationally simple for structure, be easy to realize, cost is low, is beneficial to wide popularization and application.
Below in conjunction with Figure of description and embodiment, the invention will be further described.
Accompanying drawing explanation
Fig. 1 is system architecture schematic diagram of the present invention.
Fig. 2 is the structural representation of jet absorption type oxidator in Fig. 1
Detailed description of the invention
Embodiment: see Fig. 1 and Fig. 2, the tower external oxidation method of a kind of limestone-gypsum method wet type desulfurizing that the present embodiment provides, it comprises the following steps:
(1) flue gas enters desulfurizing tower 1 from bottom to top;
(2) middle and upper part of desulfurizing tower 1 squeezed into by doctor solution by circulating pump 2, with flue gas counter current contacting sulfur dioxide absorption from top to bottom;
(3) liquid after desulfurization at the bottom of tower is squeezed in oxidation trough 4 by self-suction injection pump 3 and is carried out forced oxidation; Concrete, described oxidation trough 4 comprises cell body 41 and multiple jet absorption type oxidator 42, and multiple jet absorption type oxidator 42 is evenly plugged in the top of described cell body 41, is provided with air sparger in this cell body 41.Described jet absorption type oxidator 42 comprises a body 421, the upper end of this body 421 is provided with a junction 422, this connecting portion 422 is axially arranged with a doctor solution entrance 423 and radial direction is provided with an air suction inlet 424, one end that described body 421 is connected with connecting portion 422 is less, and middle part increases gradually.
(4) liquid after oxidized enters clean solution tank 6 after filter 5 filters;
(5) squeezed into the middle and upper part of desulfurizing tower 1 after adding absorbent in clean solution tank 6 by go back to liquid pump 7, regenerated liquid is returned desulphurization system and absorbs, the product calcium sulfate of generation takes out as real calcium sulfate product, realizes the object recycled.Preferably, described absorbent is lime stone slurry.Add absorbent, can help and quick penetration enhancement liquid to SO
2reactive absorption.Doctor solution activity after being regenerated by forced oxidation is larger, and under the effect of absorbent, greatly increase assimilation effect, can thoroughly solve and change whole common faults of current domestic calcium method desulfurization: 1. assimilation effect is poor, and liquid-gas ratio is high, internal circulating load is large, causes power consumption high.2. oxidation effectiveness is good, then system is easily blocked up, and becomes dead end, causes and cannot use.3. oxidation effectiveness is poor, then cause SO again after causing calcium sulfite to get rid of
2underground volatilization cause secondary pollution, form the problems such as the haze in air.
Preferably, the tower external oxidation method of limestone-gypsum method wet type desulfurizing of the present invention also comprises step (6): the top also in desulfurizing tower 1 is provided with water washing cleaning section and water washing cleaning hydrops section successively by order from top to bottom, this water washing cleaning hydrops section is provided with hydrops groove 8, described water washing cleaning section is provided with sprinkler head 9, and hydrops groove 8, clean solution tank 11, washing pump 10 and sprinkler head 9 are connected successively by water pipe and form water washing cycles loop.
After implementation step (6), realize adding flue gas purification system, make the flue dust after discharge become neat stress discharge in an atmosphere through last washing.Namely before flue gas goes out tower, carry out water purification washing again, micronic dust is washed down, make the flue gas of discharge cleaner, thus make the concentration of emission of flue dust significantly drop to 10mg/Nm
3below.Namely solve the problem of secondary pollution, solve again soot emissions problem not up to standard simultaneously.
A kind of desulphurization system of the tower external oxidation method for implementing above-mentioned limestone-gypsum method wet type desulfurizing, it comprises desulfurizing tower 1, self-suction injection pump 3, oxidation trough 4, filter 5, clean solution tank 6, return liquid pump 7 and circulating pump 2, the upper position of desulfurizing tower 1 has installed upper nozzle and lower nozzle, this upper nozzle is connected with the water side of circulating pump 2, the water inlet end of this circulating pump 2 is connected with the bottom of desulfurizing tower 1, the water inlet end of described self-suction injection pump 3 is connected with the bottom of desulfurizing tower 1, the other end is connected with described oxidation trough 4, this oxidation trough 4, filter 5, clean solution tank 6, return liquid pump 7 to be connected successively with lower nozzle.Top in described desulfurizing tower 1 is provided with water washing cleaning section and water washing cleaning hydrops section successively by order from top to bottom, this water washing cleaning hydrops section is provided with hydrops groove 8, described water washing cleaning section is provided with sprinkler head 9, and hydrops groove 8, clean solution tank 6, washing pump 10 and sprinkler head 9 are connected successively by water pipe and form water washing cycles loop.
Concrete, described oxidation trough 4 comprises cell body 41, air sparger and multiple jet absorption type oxidator 42 of being responsible for carrying out liquid forced oxidation, multiple jet absorption type oxidator 42 is evenly plugged in the top of described cell body 41, described air sparger is arranged in described cell body 41, is responsible for being uniformly distributed the air brought into by jet absorption type oxidator 42.Described jet absorption type oxidator 42 comprises a body 421, the upper end of this body 421 is provided with a junction 422, this connecting portion 422 is axially arranged with a doctor solution entrance 423 and radial direction is provided with an air suction inlet 424, one end that described body 421 is connected with connecting portion 422 is less, and middle part increases gradually.
The present invention adopts tower external oxidation, improve traditional torch-type oxidation on the one hand, adopt jet absorption type oxidator 42 with air sparger and mode ensure that fully contacting of air and doctor solution, greatly improve the oxidation efficiency of doctor solution, oxidation efficiency >=99%, and contribute to the blocking preventing desulfurization absorption cycle system, increase assimilation effect, reduce operating cost; Adopt clear liquid to return tower mode simultaneously, make there is not calcium sulfate sediment in desulphurization system, avoid desulphurization system blocking, ensure that work runs.
The present invention and conventional method force jet absorption type to be oxidized outward unlike original tower internal oxidition is changed into tower, and the calcium sulfate of formation is not at desulfurizing tower 1 Inner eycle, so do not block desulphurization system and desulfurizing tower 1, and oxidation effectiveness is high and can long-acting operation.Utilize simultaneously and take out pump from the method completing jet absorption type oxidation in regeneration tank, economization oxidation fan reduces cost, has effected a radical cure the problem of secondary pollution.Conventional processing methods does not have water washing cleaning section in addition, i.e. flue gas purification system.The present invention carries out water purification washing again before flue gas goes out tower, thus makes the concentration of emission of flue dust significantly drop to 10mg/Nm
3below.So namely the technology of the present invention solves the problem of secondary pollution, simultaneously solving again soot emissions problem not up to standard, is most advanced, reliable desulfurizing technology system at present.
The announcement of book and instruction according to the above description, those skilled in the art in the invention can also change above-mentioned embodiment and revise.Therefore, the present invention is not limited to detailed description of the invention disclosed and described above, also should fall in the protection domain of claim of the present invention modifications and changes more of the present invention.In addition, although employ some specific terms in this description, these terms just for convenience of description, do not form any restriction to the present invention.As described in the above embodiment the present invention, process same or similar with it and structure is adopted and other desulfurization method for oxidation and desulphurization system of obtaining, all in scope.
Claims (9)
1. a tower external oxidation method for limestone-gypsum method wet type desulfurizing, it is characterized in that, it comprises the following steps:
(1) flue gas enters desulfurizing tower from bottom to top;
(2) middle and upper part of desulfurizing tower squeezed into by doctor solution by circulating pump, with flue gas counter current contacting sulfur dioxide absorption from top to bottom;
(3) liquid after desulfurization at the bottom of tower is squeezed in oxidation trough by self-suction injection pump and is carried out forced oxidation;
(4) liquid after oxidized enters clean solution tank after filter filters;
(5) squeezed into the middle and upper part of desulfurizing tower after adding absorbent in clean solution tank by go back to liquid pump, realize the object recycled.
2. the tower external oxidation method of limestone-gypsum method wet type desulfurizing according to claim 1, it is characterized in that, described oxidation trough comprises cell body and multiple jet absorption type oxidator, and multiple jet absorption type oxidators are evenly plugged in the top of described cell body, are provided with air sparger in this cell body.
3. the tower external oxidation method of limestone-gypsum method wet type desulfurizing according to claim 2, it is characterized in that, described jet absorption type oxidator comprises a body, the upper end of this body is provided with a junction, this connecting portion is axially arranged with a doctor solution entrance and radial direction is provided with an air suction inlet, one end that described body is connected with connecting portion is less, and middle part increases gradually.
4. the tower external oxidation method of limestone-gypsum method wet type desulfurizing according to claim 1, is characterized in that, described absorbent is lime stone slurry.
5. according to the tower external oxidation method of the limestone-gypsum method wet type desulfurizing one of claim 1-4 Suo Shu, it is characterized in that, top also in desulfurizing tower is provided with water washing cleaning section and water washing cleaning hydrops section successively by order from top to bottom, this water washing cleaning hydrops section is provided with hydrops groove, described water washing cleaning section is provided with sprinkler head, and hydrops groove, clean solution tank, washing pump and sprinkler head are connected successively by water pipe and form water washing cycles loop.
6. one kind for implementing the claims the desulphurization system of the tower external oxidation method of the described limestone-gypsum method wet type desulfurizing of one of 1-5, it is characterized in that, it comprises desulfurizing tower, self-suction injection pump, oxidation trough, filter, clean solution tank, return liquid pump and circulating pump, the upper position of desulfurizing tower has installed upper nozzle and lower nozzle, this upper nozzle is connected with the water side of circulating pump, the water inlet end of this circulating pump is connected with the bottom of desulfurizing tower, the water inlet end of described self-suction injection pump is connected with the bottom of desulfurizing tower, the other end is connected with described oxidation trough, this oxidation trough, filter, clean solution tank, return liquid pump to be connected successively with lower nozzle.
7. desulphurization system according to claim 6, it is characterized in that, described oxidation trough comprises cell body, air sparger and multiple jet absorption type oxidator, and multiple jet absorption type oxidators are evenly plugged in the top of described cell body, and described air sparger is arranged in described cell body.
8. desulphurization system according to claim 7, it is characterized in that, described jet absorption type oxidator comprises a body, the upper end of this body is provided with a junction, this connecting portion is axially arranged with a doctor solution entrance and radial direction is provided with an air suction inlet, one end that described body is connected with connecting portion is less, and middle part increases gradually.
9. the desulphurization system according to claim 6 or 7, it is characterized in that, top in described desulfurizing tower is provided with water washing cleaning section and water washing cleaning hydrops section successively by order from top to bottom, this water washing cleaning hydrops section is provided with hydrops groove, described water washing cleaning section is provided with sprinkler head, and hydrops groove, clean solution tank, washing pump and sprinkler head are connected successively by water pipe and form water washing cycles loop.
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| CN201410204494.5A CN105080328A (en) | 2014-05-15 | 2014-05-15 | Out-tower oxidation method for limestone gypsum method wet type desulphurization, and desulphurization system of out-tower oxidation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111617604A (en) * | 2020-06-05 | 2020-09-04 | 碧水蓝天环境工程有限公司 | Energy-saving and environment-friendly limestone-gypsum wet flue gas desulfurization tower |
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| JPH078748A (en) * | 1993-06-14 | 1995-01-13 | Babcock Hitachi Kk | Wet process flue gas desulfurization and device using desulfurization method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111617604A (en) * | 2020-06-05 | 2020-09-04 | 碧水蓝天环境工程有限公司 | Energy-saving and environment-friendly limestone-gypsum wet flue gas desulfurization tower |
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Application publication date: 20151125 |