CN105056747A - Process and device for removing SO2 from exhaust gas generated by sulfuric acid production in phosphate chemical enterprise - Google Patents
Process and device for removing SO2 from exhaust gas generated by sulfuric acid production in phosphate chemical enterprise Download PDFInfo
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- CN105056747A CN105056747A CN201510506722.9A CN201510506722A CN105056747A CN 105056747 A CN105056747 A CN 105056747A CN 201510506722 A CN201510506722 A CN 201510506722A CN 105056747 A CN105056747 A CN 105056747A
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- ore pulp
- ore
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- circulating slot
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Abstract
The invention provides a process and device for removing SO2 from exhaust gas generated by sulfuric acid production in a phosphate chemical enterprise. According to the process, SO2 in exhaust gas of a sulfuric acid device is absorbed through phosphorite slurry mainly, sulfite is generated through reaction, and sulfite is oxidized into sulfate in an oxidation buffer tank. The device comprises a slurry mixing tank, a desulphurizing tower, the oxidation buffer tank and an ore pulp circulating tank, wherein the slurry mixing tank is connected with the ore pulp circulating tank through an ore pulp pump; the lower part of the desulphurizing tower is communicated with the ore pulp circulating tank. By adopting the process and the device provided by the invention, solid waste is not generated, no secondary pollution is realized, sulfur-containing ore pulp absorbing sulfur dioxide is directly conveyed to a phosphoric acid extraction device for preparing phosphoric acid, the process provided by the invention is a more environment-friendly flue gas desulfurization process, and has relatively high economic benefits and environmental benefits, in addition, the process and device are simple, the occupied area is small and the running cost is low.
Description
Technical field
The present invention relates to a kind of phosphorous chemical industry enterprise Sulphuric acid tail gas and remove SO
2technique and device.
Background technology
Sulfur dioxide is pollutant main in air, not only toxic to human body, still produce the main cause of acid rain, it is large to there is investment in existing desulfur technology, and energy consumption is high simultaneously, pipeline is perishable, technological process is complicated, and operation runs the problems such as numerous and diverse, and domestic sulfuric acid production plant mainly adopts double conversion double absorption technique, because the conversion ratio by device limits, traditional double conversion double absorption technique is difficult to reach national emission standards for sulfur dioxide (≤400mg/m3).Concerning phosphorous chemical industry enterprise sulfuric acid apparatus, existing sulfur method and device all drop into huge, and corollary equipment is more.Sulfuric acid tail gas is typical low-concentration sulfur dioxide (SO
2volume content≤3%) waste gas is also SO in air
2one of main source.The annual sulfuric acid total output of China more than 50% for the manufacture of phosphate fertilizer, from the angle of large phosphoric acid, sulfuric acid and phosphoric acid plant are organic wholes, and in phosphorizing treatment, carrying out effective sulfuric acid tail gas desulfurized treatment will to SO
2highly effective effect is played in the control of total emission volumn.A kind of phosphorous chemical industry enterprise Sulphuric acid tail gas removes SO
2technique mainly utilize phosphorus ore slurries to absorb SO in sulfuric acid apparatus tail gas
2, reaction generates sulphite, and sulphite is oxidized to sulfate in oxidation buffer groove.This method does not produce solid waste, non-secondary pollution, and the sulfur-bearing ore pulp of sulfur dioxide absorption directly delivers to phosphoric acid extraction device phosphoric acid, is a kind of more green flue gas desulfurization technique, has higher economy, environmental benefit.
Summary of the invention
The object of this invention is to provide a kind of phosphorous chemical industry enterprise Sulphuric acid tail gas and remove SO
2technique and device, its technique mainly utilizes the SO in phosphate ore pulp absorbing liquid absorption sulfuric acid apparatus tail gas
2, reaction generates sulphite, and sulphite is oxidized to sulfate in oxidation buffer groove; This device comprises surge tank, desulfurizing tower, oxidation buffer groove and ore pulp circulating slot.Technique of the present invention is simple, has higher economic benefit and environmental benefit, its device is simple, floor space is little, operating cost is low.
The object of the present invention is achieved like this:
This phosphorous chemical industry enterprise Sulphuric acid tail gas removes SO
2technique, its technological process is: phosphorus ore slurries deliver to desulfurization zone surge tank by pipeline, then to ore pulp circulating slot, phosphate ore pulp enters desulfurizing tower, and when phosphorus ore plasm PH value drops to 4.5-55, phosphorus ore slurries are pumped into oxidation buffer groove by desulphurization circulating, after sulfite oxidation is become sulfate, phosphorus ore slurries in oxidation buffer groove deliver to phosphoric acid plant by doctor solution rear pump, and flue gas, after desulfurizing tower purification, directly enters air after demister foam removal.
Phosphorus ore is made after satisfactory phosphorus ore slurries through wet-milling, desulfurization zone surge tank is delivered to by pipeline, then ore pulp circulating slot is delivered to through ore slurry pump, phosphate ore pulp enters desulfurizing tower spraying layer by desulfuration recycle pump, desulfurization slurry is distributed to the high efficient anti-blocking solid-cone (type) nozzle configured in tower from the circle distributor of complete closure eight-sided formation, when absorbing liquid pH value drops to 4.5-5.5, deliver to oxidation buffer groove, after sulfite oxidation is become sulfate, deliver to phosphoric acid plant, flue gas, after desulfurizing tower purification, directly enters air after demister foam removal.
A kind of phosphorous chemical industry enterprise Sulphuric acid tail gas removes SO
2device, comprise surge tank, desulfurizing tower, oxidation buffer groove and ore pulp circulating slot, surge tank connects ore pulp circulating slot by ore slurry pump, desulfurizing tower bottom leads to ore pulp circulating slot, desulfurizing tower internal upper part has demister, have desulfuration recycle pump between surge tank and ore pulp circulating slot, in oxidation buffer groove 6, phosphorus ore slurries deliver to phosphoric acid plant by doctor solution rear pump 7.
Technique of the present invention does not produce solid waste, non-secondary pollution, the sulfur-bearing ore pulp of sulfur dioxide absorption directly delivers to phosphoric acid plant phosphoric acid, is a kind of more green flue gas desulfurization technique, there are higher economy, environmental benefit, technique and system is simple, floor space is little, operating cost is low.Possess skills novelty, ripe, desulfuration efficiency high, and desulfurizing agent is without the need to outsourcing, and desulphurization cost reduces greatly.
Accompanying drawing explanation
Fig. 1 is that a kind of phosphorous chemical industry enterprise of the present invention Sulphuric acid tail gas removes SO
2process chart.
Fig. 2 is that a kind of phosphorous chemical industry enterprise of the present invention Sulphuric acid tail gas removes SO
2the structural representation of device.
Detailed description of the invention
In Fig. 1, a kind of phosphorous chemical industry enterprise of the present invention Sulphuric acid tail gas removes SO
2technological process is: phosphorus ore is made after satisfactory phosphorus ore slurries through wet-milling, desulfurization zone surge tank 1 is delivered to by pipeline, then ore pulp circulating slot 8 is delivered to through ore slurry pump 2, phosphate ore pulp enters desulfurizing tower 3 spraying layer by desulfuration recycle pump 4, desulfurization slurry is distributed to the high efficient anti-blocking solid-cone (type) nozzle configured in tower from the circle distributor of complete closure eight-sided formation, make the slurries of ejection under spray effect, form the misty liquid droplets of about 2mm, phosphorus ore slurries solution-air sufficient with tail gas in desulfurizing tower 3 contacts.In the decline process of drop, slurries absorb the SO in flue gas
2.Absorbed SO
2react in resuspension procedure with desulfurizing agent and generate sulphite and phosphoric acid.Absorbing liquid is continuous cyclic absorption SO between circulating slot 8 and desulfurizing tower 3
2.When absorbing liquid pH value drops to 4.5-5.5, phosphorus ore slurries are sent to oxidation buffer groove 6, after sulphite is oxidized to sulfate in oxidation buffer groove 6, deliver to phosphoric acid plant by doctor solution rear pump, flue gas, after desulfurizing tower purification, directly enters air after demister 5 foam removal.
In Fig. 2, a kind of phosphorous chemical industry enterprise of the present invention Sulphuric acid tail gas removes SO
2device, comprise surge tank 1, desulfurizing tower 3, oxidation buffer groove 6 and ore pulp circulating slot 8, surge tank 1 connects ore pulp circulating slot 8 by ore slurry pump 2, desulfurizing tower 3 bottom leads to ore pulp circulating slot 8, desulfurizing tower 3 internal upper part has demister 5, have desulfuration recycle pump 4 between surge tank 1 and ore pulp circulating slot 8, oxidation buffer groove 6 leads to doctor solution rear pump 7.
The circle distributor of complete closure eight-sided formation: the distributor being arranged on the outer wall of tail gas clean-up scrubbing tower is provided with feed tube and liquid outlet, the octagon closed that distributor pipe is made up of hollow tubular part, described hollow tubular part is 8 angle connectors, multiple adjustment section, 1 inlet and multiple threeway drain pipe; Be provided with adjustment section between each angle connector, distributor pipe be evenly equipped with threeway drain pipe, be provided with 1 inlet at distributor pipe place; Described angle connector, adjustment section, inlet and threeway drain pipe two ends are provided with flange, and each hollow tubular part removably connects.
High efficient anti-blocking solid-cone (type) nozzle is spray thrower for gas purification, and it is made up of catheter and regulating sleeve.Catheter is threaded regulating sleeve, regulating sleeve right-hand member is the vortex chamber of inner large outer little hole composition, catheter right-hand member endoporus is by being parallel to each other, with catheter axes normal, width equals the serpentine right clapboard of internal bore radius, serpentine left clapboard is divided into two chambeies, the upper convex surface of serpentine right clapboard is adjacent with the concave surface of serpentine left clapboard, the concave surface of serpentine right clapboard is adjacent with convex surface on the face of " S " shape left clapboard, serpentine left clapboard is fixedly connected with in the middle of serpentine right clapboard, the upper convex surface of two adjacent serpentine dividing plates and concave surface formed respectively two adjacent, direction is contrary, with the delivery port of catheter axes normal.Catheter and regulating sleeve are for being threaded, rotating regulating sleeve, can change the distance between catheter and regulating sleeve, namely changes the size of vortex chamber, make by vortex chamber water flow pressure change, delivery port is comparatively large, and current define eddy current in vortex chamber, and cleaning solution can be made during use unimpeded, be not easy blocked, not bias current, cleaning solution sprays evenly, substantially increases clean result.
Demister 5 is a kind of grid surface baffling demisters, the inner chamber of the cross section of shell is filled by multiple foam removal unit, foam removal unit is provided with defoaming plate in supporting frame, multi-disc defoaming plate is fixedly connected in supporting frame, has interval between each defoaming plate, and described defoaming plate is vertically rectangular corrugated, described defoaming plate face is not penetrating, the right side is concavo-convex grid surface, and the left side is shiny surface, and the grid surface direction being connected to the multi-disc defoaming plate in supporting frame is consistent.Defoaming plate one side be concavo-convex grid surface, and another face is shiny surface, is connected to the grid surface direction of the defoaming plate in supporting frame unanimously, and the rhombus periphery due to defoaming plate epirelief is formed recessed latticed.Form undulatory gas channel between two pieces of defoaming plates, gas channel one side is smooth plane, and another side is grid surface.
Technique of the present invention adopts phosphorus ore slurries to make desulfurization absorbent.Phosphorus ore is made through wet-milling the phosphorus ore slurries that solid content is 50%, granularity 90% crosses 150 mesh sieves, controls phosphate ore pulp pH value > 7.Ore pulp ore slurry pump is delivered to ore pulp circulating slot, and sulfuric acid tail gas also passes in desulfurizing tower continuously, controls temperature of reactor 20 ~ 65 DEG C, and the sulfur dioxide in sulfuric acid tail gas and oxygen react and generates H
2s0
3, then H
2s0
3with the ground phosphate rock Ca in phosphate ore pulp
5f (PO
4)
3, CaCO
3and MgCO
3react, generate corresponding sulphite and phosphoric acid, sulphite is oxidized to sulfate in oxidation buffer groove, thus reaches the object of desulfurization.When the exit concentration of sulfur dioxide drops to≤300mg/m
3, during the pH value 4.5-5.5 of phosphate ore pulp, reaction completes, and phosphate ore pulp absorption efficiency is because of the H of phosphorus ore and generation
2s0
4generate phosphoric acid after reaction and lost efficacy gradually.Flue gas, after desulfurizing tower purification, directly enters air after entering demister foam removal.Final reacting product sulfate and phosphoric acid directly send into phosphoric acid plant through doctor solution rear pump.
Case: 200,000 tons of sulfuric acid apparatus tail gas amounts are 140000m3/h; Tail gas is 650mg/Nm containing sulfur dioxide
3, phosphate ore pulp solid content is 50-60%, and granularity is 150 ~ 200 orders, initial phosphorus ore plasm PH value >7.Controlling air velocity in desulfurizing tower is 1-1.5m/s, desulfurizing tower tower diameter Φ 5500, tower height 14000.Washing ore pulp amount 650-750m3/h, sprinkle density is 27.4-31.6m3/ ㎡ h, and through detecting, after phosphate ore pulp desulfurization, tail gas is 219mg/Nm containing sulfur dioxide
3, reach discharging standards.
Claims (3)
1. a phosphorous chemical industry enterprise Sulphuric acid tail gas removes SO
2technique, it is characterized in that technological process is: phosphorus ore slurries deliver to desulfurization zone surge tank (1) by pipeline, then to ore pulp circulating slot (8), phosphate ore pulp enters desulfurizing tower (3), when absorbing liquid pH value drops to 4.5-5.5, desulphurization circulating is utilized to be pumped into oxidation buffer groove (6), after sulfite oxidation is become sulfate, by doctor solution rear pump, interior for oxidation buffer groove (6) phosphorus ore slurries are delivered to phosphoric acid plant, flue gas, after desulfurizing tower purification, directly enters air after demister (5) foam removal.
2. phosphorous chemical industry enterprise as claimed in claim 1 Sulphuric acid tail gas removes SO
2technique, described technological process is: phosphorus ore is made after satisfactory phosphorus ore slurries through wet-milling, desulfurization zone surge tank (1) is delivered to by pipeline, then ore pulp circulating slot (8) is delivered to through ore slurry pump (2), phosphate ore pulp enters desulfurizing tower (3) spraying layer by desulfuration recycle pump (4), desulfurization slurry is distributed to the high efficient anti-blocking solid-cone (type) nozzle configured in tower from the circle distributor of complete closure eight-sided formation, when phosphorus ore plasm PH value drops to certain value, deliver to oxidation buffer groove (6), after sulfite oxidation is become sulfate, phosphorus ore slurries deliver to phosphoric acid plant by doctor solution rear pump, flue gas is after desulfurizing tower purification, directly air is entered after demister (5) foam removal.
3. a phosphorous chemical industry enterprise Sulphuric acid tail gas removes SO
2device, comprise surge tank (1), desulfurizing tower (3), oxidation buffer groove (6) and ore pulp circulating slot (8), it is characterized in that: surge tank (1) connects ore pulp circulating slot (8) by ore slurry pump (2), the bottom of desulfurizing tower (3) leads to ore pulp circulating slot (8), the internal upper part of desulfurizing tower (3) has demister (5), have desulfuration recycle pump (4) between surge tank (1) and ore pulp circulating slot (8), the interior phosphorus ore slurries of oxidation buffer groove (6) deliver to phosphoric acid plant by doctor solution rear pump (7).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510506722.9A CN105056747A (en) | 2015-08-18 | 2015-08-18 | Process and device for removing SO2 from exhaust gas generated by sulfuric acid production in phosphate chemical enterprise |
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| CN201510506722.9A CN105056747A (en) | 2015-08-18 | 2015-08-18 | Process and device for removing SO2 from exhaust gas generated by sulfuric acid production in phosphate chemical enterprise |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105536492A (en) * | 2015-12-25 | 2016-05-04 | 昆明尔康科技有限公司 | Method for preparing phosphoric ore slurry desulfurizer by ammonium fluoride wastewater |
| CN106039972A (en) * | 2016-06-24 | 2016-10-26 | 昆明理工大学 | Method for purifying industrial exhaust by use of phosphoric ore pulp |
| CN106276831A (en) * | 2016-08-24 | 2017-01-04 | 湖北三宁化工股份有限公司 | One utilizes SO2gas and phosphate ore pulp reaction produce the method and device of phosphoric acid |
| CN106345288A (en) * | 2016-08-24 | 2017-01-25 | 湖北祥云(集团)化工股份有限公司 | Method and system for utilizing phosphoric ore pulp to treat sulfur-containing flue gas |
| CN106731606A (en) * | 2016-12-29 | 2017-05-31 | 江苏河海新能源股份有限公司 | A kind of wet desulphurization device |
| CN107899596A (en) * | 2017-10-30 | 2018-04-13 | 昆明理工大学 | A kind of desulfurization denitrification agent and preparation method thereof |
| CN108434977A (en) * | 2017-11-24 | 2018-08-24 | 云南民族大学 | A kind of method of phosphate ore pulp liquid phase catalytic oxidation simultaneous SO_2 and NO removal |
-
2015
- 2015-08-18 CN CN201510506722.9A patent/CN105056747A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105536492A (en) * | 2015-12-25 | 2016-05-04 | 昆明尔康科技有限公司 | Method for preparing phosphoric ore slurry desulfurizer by ammonium fluoride wastewater |
| CN105536492B (en) * | 2015-12-25 | 2019-03-08 | 昆明尔康科技有限公司 | A kind of method that ammonium fluoride waste water prepares phosphate ore pulp desulfurizing agent |
| CN106039972A (en) * | 2016-06-24 | 2016-10-26 | 昆明理工大学 | Method for purifying industrial exhaust by use of phosphoric ore pulp |
| CN106039972B (en) * | 2016-06-24 | 2018-07-24 | 昆明理工大学 | A method of with phosphate ore pulp purified industrial tail gas |
| CN106276831A (en) * | 2016-08-24 | 2017-01-04 | 湖北三宁化工股份有限公司 | One utilizes SO2gas and phosphate ore pulp reaction produce the method and device of phosphoric acid |
| CN106345288A (en) * | 2016-08-24 | 2017-01-25 | 湖北祥云(集团)化工股份有限公司 | Method and system for utilizing phosphoric ore pulp to treat sulfur-containing flue gas |
| CN106345288B (en) * | 2016-08-24 | 2019-04-26 | 湖北祥云(集团)化工股份有限公司 | A kind of method and system using phosphate ore pulp processing sulfur-containing smoke gas |
| CN106731606A (en) * | 2016-12-29 | 2017-05-31 | 江苏河海新能源股份有限公司 | A kind of wet desulphurization device |
| CN107899596A (en) * | 2017-10-30 | 2018-04-13 | 昆明理工大学 | A kind of desulfurization denitrification agent and preparation method thereof |
| CN108434977A (en) * | 2017-11-24 | 2018-08-24 | 云南民族大学 | A kind of method of phosphate ore pulp liquid phase catalytic oxidation simultaneous SO_2 and NO removal |
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Application publication date: 20151118 |
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