CN210752067U - Sodium-based dry method or semi-dry method flue gas desulfurization byproduct processing apparatus - Google Patents
Sodium-based dry method or semi-dry method flue gas desulfurization byproduct processing apparatus Download PDFInfo
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- CN210752067U CN210752067U CN201921287859.XU CN201921287859U CN210752067U CN 210752067 U CN210752067 U CN 210752067U CN 201921287859 U CN201921287859 U CN 201921287859U CN 210752067 U CN210752067 U CN 210752067U
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Abstract
The application relates to a sodium-based dry method or semi-dry method flue gas desulfurization byproduct treatment device, which comprises a lime slurry device, a sodium bicarbonate device, a first bag-type dust remover, a second bag-type dust remover, a rotary spray desulfurization tower, a regeneration tank, a sedimentation tank, a clarification tank and a sodium-alkali tank, the sulphuric acid jar, oxidation unit, rotatory spraying desulfurizing tower entry respectively with lime thick liquid device export, soda pond export intercommunication, lime thick liquid device and regeneration pond intercommunication, rotatory spraying desulfurizing tower solid export and oxidation unit intercommunication, rotatory spraying desulfurizing tower gas outlet in proper order with a sack cleaner, No. two sack cleaners, the regeneration pond, the sedimentation tank, the clarification tank, soda pond intercommunication, set up the sodium bicarbonate device between a sack cleaner and No. two sack cleaners, the sedimentation tank is through arranging slag pump and oxidation unit intercommunication. The structure is simple, the use is convenient, the cost is low, and the effect is good.
Description
Technical Field
The application relates to a flue gas desulfurization byproduct treatment device adopting a sodium-based dry method or a semi-dry method, which is mainly suitable for converting desulfurization byproducts taking sodium sulfate and sodium sulfite as main components into gypsum convenient for industrial application, and recycling regenerated sodium-alkali desulfurization solution to improve desulfurization efficiency.
Background
In recent years, sodium-based dry and semi-dry flue gas desulfurization has been widely recommended for use in flue gas desulfurization processes with low sulfur dioxide concentrations, such as coke oven flue gas and gas boiler flue gas desulfurization, but it is difficult to apply flue gas desulfurization to industrial production because the by-products formed by desulfurization mainly contain sodium sulfate and sodium sulfite. The existing regeneration device regenerates the sodium-based desulfurization product to generate sodium-alkali solution, but the regenerated gypsum has insufficient purity and poor oxidation effect. In addition, the dry or semi-dry desulfurization efficiency is lower than that of the wet desulfurization, and a solution is needed.
Disclosure of Invention
The technical problem that this application was solved is to overcome the above-mentioned not enough that exists among the prior art, and provides a structure succinct, convenient to use, and is with low costs, effectual sodium-based dry process or semidry process flue gas desulfurization accessory substance processing apparatus.
The technical scheme adopted by the application for solving the technical problems comprises the following steps: a sodium-based dry or semi-dry flue gas desulfurization byproduct treatment device comprises a lime slurry device, a sodium bicarbonate device, a first bag-type dust remover, a second bag-type dust remover, a rotary spray desulfurization tower, a regeneration tank, a sedimentation tank, a clarification tank, a soda tank, a sulfuric acid tank and an oxidation device, wherein two inlets of the rotary spray desulfurization tower are respectively communicated with one outlet of the lime slurry device and an outlet of the soda tank, the other outlet of the lime slurry device is communicated with the inlet of the regeneration tank, one solid outlet of the rotary spray desulfurization tower is communicated with the oxidation device, the other gas outlet of the rotary spray desulfurization tower is connected with the inlet of the first bag-type dust remover, the outlet of the first bag-type dust remover is connected with the inlet of the second bag-type dust remover, the sodium bicarbonate device is arranged between the first bag-type dust remover and the second bag-type dust remover, the outlet of the second bag-type dust, an outlet of the sedimentation tank is communicated with an inlet of the clarification tank, another outlet of the sedimentation tank is communicated with the oxidation device through a slag discharge pump, and an outlet of the clarification tank is communicated with an inlet of the sodium alkali tank. One part of the regenerated product is sent to the oxidation device, and the other part is sent to the clarification tank and is sent to the rotary spray desulfurization tower through the soda pond and recycles, has improved resource utilization and desulfurization efficiency.
The application lime slurry device is connected by quick lime powder storehouse, lime slurry storehouse and constitutes, and export and rotatory spraying desulfurizing tower entry intercommunication in lime slurry storehouse, another export and regeneration pond entry intercommunication in lime slurry storehouse.
A filter plate is arranged between the sedimentation tank and the clarification tank, a stirring rod is arranged above the regeneration tank, the pH value in the regeneration tank is adjusted by adding lime slurry through a lime slurry device, and the pH value is controlled between 7 and 9.
The oxidation device comprises an oxidation pond, an oxidation fan and a sulfuric acid tank, wherein another outlet of the sedimentation tank is communicated with the oxidation pond through a slag discharge pump, and the oxidation fan and the sulfuric acid tank are connected to the oxidation pond. The pH value of the oxidation pond is controlled to be less than 6 by using dilute sulfuric acid, which is beneficial to oxidizing calcium sulfite into calcium sulfate and greatly improves the purity of gypsum.
The treatment process of the sodium-based dry or semi-dry flue gas desulfurization treatment device comprises the following steps:
s1: introducing the lime slurry into a rotary spray desulfurization tower;
s2: desulfurizing sulfur-containing flue gas passing through the rotary spray desulfurization tower in the tower; dedusting the smoke passing through a first bag dust collector and a second bag dust collector; injecting sodium bicarbonate to a flue between the first bag-type dust remover and the second bag-type dust remover through a sodium bicarbonate device;
s3: discharging the sodium sulfate and sodium sulfite byproducts generated by sodium bicarbonate desulfurization into a regeneration tank, simultaneously adding lime slurry, and reacting to generate calcium sulfite precipitate (main reaction: Na) under the stirring action of a stirring rod in the regeneration tank2SO3+ Ca(OH)2= CaSO3+ 2NaOH；Na2SO4+ Ca(OH)2= CaSO4+ 2 NaOH), adjusting the pH value of the regeneration tank to 7-9 by adjusting the amount of the lime slurry;
s4: discharging the calcium sulfite slurry in the regeneration tank into a sedimentation tank through overflow to form a calcium sulfite sediment layer, arranging a slag discharge pump at the bottom of the sedimentation tank, pumping out the calcium sulfite sediment and sending the calcium sulfite sediment to an oxidation tank for oxidation treatment;
s5: introducing oxidizing air into the oxidation pond through an oxidizing fan, oxidizing the calcium sulfite slurry entering the oxidation pond, continuously injecting sulfuric acid into the oxidation pond through a sulfuric acid tank, keeping the pH value in the oxidation pond not higher than 6, and oxidizing the calcium sulfite slurry into gypsum slurry; the gypsum slurry in the oxidation pond is pumped to a vacuum belt filter through a peroxide pond slurry discharging pump and filtered by the vacuum belt filter to generate gypsum;
s6: and the sodium-alkali solution in the clarification tank enters a sodium-alkali tank, the sodium-alkali solution is sent into a rotary spray desulfurization tower by a pump, and the sodium-alkali solution and the lime slurry are matched and used simultaneously, so that the desulfurization efficiency is improved.
The method can also be used for setting a preparation step before the step S1, pouring quick lime in a quick lime powder bin into a lime slurry bin and adding water to prepare lime slurry in the preparation step, and then starting the rotary spray desulfurization tower, the first bag-type dust collector and the second bag-type dust collector.
Compared with the prior art, the application has the following advantages and effects: the structure is succinct, convenient to use, and is with low costs, both can regenerate sodium-based desulfurization product, also carries out better oxidation to the gypsum that the accessory substance generated, improves purity, can adjust the sodium alkaline solution that generates simultaneously with calcium alkaline solution simultaneously and use, improves the desulfurization efficiency of desulfurizing tower.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present application.
The notation in fig. 1: 1-quicklime powder bin; 2-lime slurry storehouse; 3-sodium bicarbonate device; 4-bag dust collector of second type; 5-bag dust collector; 6-rotating spray desulfurizing tower; 7-regeneration pool; 8, a sedimentation tank; 9-a clarification tank; 10-soda pool; 11-sulfuric acid tank; 12-an oxidation fan; 13-an oxidation pond; 14-vacuum belt filter.
Detailed Description
The present application will be described in further detail below with reference to the accompanying drawings by way of examples, which are illustrative of the present application and are not limited to the following examples.
Referring to fig. 1, the embodiment includes a lime slurry device, a sodium bicarbonate device 3, a first bag-type dust remover 5, a second bag-type dust remover 4, a rotary spray desulfurization tower 6, a regeneration tank 7, a sedimentation tank 8, a clarification tank 9, a soda-alkali tank 10, a sulfuric acid tank 11, an oxidation fan 12, an oxidation tank 13 and a vacuum belt filter 14, two inlets of the rotary spray desulfurization tower 6 are respectively communicated with an outlet of the lime slurry device and an outlet of the soda-alkali tank 10, another outlet of the lime slurry device is communicated with an inlet of the regeneration tank 7, a solid outlet of the rotary spray desulfurization tower 6 is communicated with an inlet of the oxidation tank 13, another gas outlet of the rotary spray desulfurization tower 6 is connected with an inlet of the first bag-type dust remover 5, an outlet of the first bag-type dust remover 5 is connected with an inlet of the second bag-type dust remover 4, the sodium bicarbonate device 3 for spraying sodium bicarbonate is arranged between the, an outlet of a bag-type dust collector 4 is communicated with an inlet of a regeneration tank 7, an outlet of the regeneration tank 7 is communicated with an inlet of a sedimentation tank 8, an outlet of the sedimentation tank 8 is communicated with an inlet of a clarification tank 9, another outlet of the sedimentation tank 8 is communicated with an inlet of an oxidation tank 13 through a slag discharge pump, the oxidation tank 13 is connected with a sulfuric acid tank 11, an oxidation fan 12 and a vacuum belt filter 14, and the clarification tank 9 is communicated with a sodium alkali tank 10.
The application lime thick liquid device comprises quick lime powder storehouse 1, lime thick liquid storehouse 2 connection for provide the lime thick liquid.
The method comprises the following steps of feeding dust-containing flue gas into a rotary spray (semi-dry process) desulfurization tower 6, firstly carrying out calcium process desulfurization on the dust-containing flue gas, and removing most of smoke dust and solids generated by desulfurization in the flue gas through a first bag-type dust remover 5. Because the semi-dry desulfurization efficiency cannot reach the ultralow emission standard, the flue is required to be sprayed with sodium bicarbonate for desulfurization, so that a small amount of sulfur dioxide in the flue gas is removed. The generated desulfurization by-products are collected by the second bag-type dust collector 4. And sending the collected by-products to a regeneration device for regeneration.
The regeneration device comprises a regeneration tank 7, a sedimentation tank 8 and a clarification tank 9. A filter plate is arranged between the sedimentation tank 8 and the clarification tank 9. A stirring rod is arranged above the regeneration tank 7. And (4) automatically adding regenerated alkali according to the pH value in the regeneration pool for regeneration, wherein the pH value is controlled between 7 and 9. Wherein the regenerated alkali is lime slurry.
The oxidation device comprises an oxidation pond 13, an oxidation fan 12 and a sulfuric acid tank 11. The sedimentation tank 8 is connected with an oxidation tank 13, the oxidation tank 13 is connected with an oxidation fan 12 and a sulfuric acid tank 11, and the pH value of the liquid in the oxidation tank 13 is controlled to be less than 6 by using dilute sulfuric acid, so that the oxidation of calcium sulfite into calcium sulfate is facilitated, and the purity of gypsum is greatly improved.
The clarification tank 9 is connected with a sodium alkali tank 10, and the sodium alkali tank 10 is communicated with the rotary spray desulfurization tower 6.
The lime slurry bin 2 is communicated with a regeneration tank 7.
The desulfurization process mainly comprises the following steps:
adding lime powder into a lime slurry pool 2 through a feeding device arranged at the bottom of a quicklime powder bin 1, and preparing lime slurry in a certain proportion by controlling the addition amount of water;
when sulfur-containing flue gas passes through the rotary spray desulfurization tower 6, the rotary spray desulfurization tower 6 is started to carry out in-tower desulfurization; simultaneously starting a first bag-type dust collector 5 and a second dust collector 4;
powder is sprayed to a flue between a first bag-type dust collector 5 and a second bag-type dust collector 4 through a feeding device arranged at the bottom of a sodium bicarbonate device 3;
and discharging the desulfurization byproducts sodium sulfate and sodium sulfite collected by the second bag-type dust collector 4 into the regeneration tank 7, adding lime slurry, reacting to generate calcium sulfite precipitate under the stirring action of a stirring rod in the tank, and preventing the precipitate from settling to the bottom of the regeneration tank 7 under the stirring action. The pH value of the regeneration tank 7 is adjusted to be between 7 and 9 by controlling the amount of the lime slurry.
The calcium sulfite slurry in the regeneration tank 7 is discharged into the sedimentation tank 8 through overflow, a calcium sulfite sediment layer is formed at a slag hopper at the bottom of the sedimentation tank 8 under the sedimentation action of the sedimentation tank 8, a slag discharge pump is arranged at the bottom of the sedimentation tank 8, the calcium sulfite sediment is timely pumped out and sent to the oxidation tank 13, and the calcium sulfite sediment enters the oxidation tank 13 for oxidation treatment.
The calcium sulfite slurry entering the oxidation pond 13 contains sodium alkali solution, the pH value is high, air is introduced for oxidation after the pH value is adjusted, and the maximum oxidation efficiency of the calcium sulfite can be achieved. The sulfuric acid is continuously injected into the oxidation pond 13 through the sulfuric acid tank 11, the pH value in the oxidation pond 13 is kept not higher than 6, and meanwhile, oxidation air is blown into the oxidation pond 13 through the oxidation fan 12 to oxidize the calcium sulfite slurry into gypsum slurry. The gypsum slurry in the oxidation pond 13 is pumped to the vacuum belt filter 14 through a oxidation pond slurry discharge pump, and is filtered by the vacuum belt filter 14 to generate gypsum.
A large amount of sodium-alkali solution in the clarification tank 9 enters a sodium-alkali tank 10, and is sent into the rotary spray desulfurization tower 6 by a pump, and sodium alkali and calcium alkali are matched and used simultaneously to improve the desulfurization efficiency.
All simple variations and combinations of the technical features and technical solutions of the present application are considered to fall within the scope of the present application.
Claims (4)
1. The utility model provides a sodium-based dry process or semidry process flue gas desulfurization accessory substance processing apparatus, includes lime thick liquid device, sodium bicarbonate device, a sack cleaner, No. two sack cleaners, rotatory spraying desulfurizing tower, regeneration pond, sedimentation tank, clarification tank, soda pond, sulfuric acid tank, oxidation unit, characterized by: two entrances of rotatory spraying desulfurizing tower respectively with export of lime thick liquid device, soda pond export intercommunication, another export of lime thick liquid device and regeneration pond entry intercommunication, solid export and the oxidation unit intercommunication of rotatory spraying desulfurizing tower, another gas outlet of rotatory spraying desulfurizing tower links to each other with a sack cleaner entry, a sack cleaner export links to each other with No. two sack cleaner entries, set up the sodium bicarbonate device between a sack cleaner and No. two sack cleaners, No. two sack cleaner exports and regeneration pond entry intercommunication, regeneration pond export and sedimentation tank entry intercommunication, export and the depositing reservoir entry intercommunication of sedimentation tank, another export of sedimentation tank communicates through slag discharge pump and oxidation unit intercommunication, the depositing reservoir export communicates with soda pond entry.
2. The sodium-based dry or semi-dry flue gas desulfurization byproduct treatment device according to claim 1, characterized in that: the lime slurry device is formed by connecting a lime powder bin and a lime slurry bin, one outlet of the lime slurry bin is communicated with the inlet of the rotary spray desulfurization tower, and the other outlet of the lime slurry bin is communicated with the inlet of the regeneration tank.
3. The sodium-based dry or semi-dry flue gas desulfurization byproduct treatment device according to claim 1, characterized in that: a filter plate is arranged between the sedimentation tank and the clarification tank, and a stirring rod is arranged above the regeneration tank.
4. The sodium-based dry or semi-dry flue gas desulfurization byproduct treatment device according to claim 1, characterized in that: the oxidation device comprises an oxidation pond, an oxidation fan and a sulfuric acid tank, wherein another outlet of the sedimentation tank is communicated with the oxidation pond through a slag discharge pump, and the oxidation fan and the sulfuric acid tank are connected to the oxidation pond.
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| CN201921287859.XU CN210752067U (en) | 2019-08-09 | 2019-08-09 | Sodium-based dry method or semi-dry method flue gas desulfurization byproduct processing apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110368801A (en) * | 2019-08-09 | 2019-10-25 | 浙江大学 | Sodium backbone method or semi-dry process flue gas desulphurization by-product processing unit and processing method |
| CN115403059A (en) * | 2022-09-02 | 2022-11-29 | 东方电气集团东方锅炉股份有限公司 | Method and system for recycling sodium bicarbonate dry-process desulfurized fly ash |
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2019
- 2019-08-09 CN CN201921287859.XU patent/CN210752067U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110368801A (en) * | 2019-08-09 | 2019-10-25 | 浙江大学 | Sodium backbone method or semi-dry process flue gas desulphurization by-product processing unit and processing method |
| CN115403059A (en) * | 2022-09-02 | 2022-11-29 | 东方电气集团东方锅炉股份有限公司 | Method and system for recycling sodium bicarbonate dry-process desulfurized fly ash |
| CN115403059B (en) * | 2022-09-02 | 2023-07-07 | 东方电气集团东方锅炉股份有限公司 | Method and system for recycling baking soda dry desulfurization ash |
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