CN115414776B - Method for improving oxidation efficiency in wet desulfurization process - Google Patents
Method for improving oxidation efficiency in wet desulfurization process Download PDFInfo
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- CN115414776B CN115414776B CN202210977738.8A CN202210977738A CN115414776B CN 115414776 B CN115414776 B CN 115414776B CN 202210977738 A CN202210977738 A CN 202210977738A CN 115414776 B CN115414776 B CN 115414776B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
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Abstract
The invention provides a method for improving oxidation efficiency in a wet desulfurization process, which increases the retention time of oxidized air and reduces the size of bubbles by a retention crushing device. According to the invention, through arranging the oxidized wind detention crushing device with the span structure, the detention time of oxidized wind bubbles is prolonged, the bubble size is reduced, the air supply quantity under different oxidized wind demand quantities during variable working conditions of a unit can be effectively reduced, and the utilization rate of oxidized air is improved.
Description
Technical Field
The invention relates to a method for improving oxidation efficiency in a wet desulfurization process, and belongs to the technical field of wet desulfurization.
Background
The oxidation of sulfite is an important reaction in the limestone-gypsum wet desulfurization process, and the dissolved oxygen in the slurry of the absorption tower oxidizes the sulfite into sulfate, and finally the sulfate is crystallized and separated out in the form of gypsum, thus playing a vital role in the quality of desulfurization slurry, desulfurization efficiency and gypsum quality. The oxidation systems of limestone-gypsum wet desulfurization facilities all adopt forced oxidation processes, the dissolved oxygen in the desulfurization slurry mainly comes from oxidation air sprayed into an oxidation zone of an absorption tower, and the shortage or excess or uneven distribution of the oxidation air can adversely affect the safe and economic operation of wet desulfurization.
At present, the arrangement of the desulfurization and oxidation air pipes is mainly divided into a pipe network type mode and a spray gun type mode, the spray gun type mode has a certain problem, the pipe network type oxidation air pipes have a complex structure compared with the spray gun type mode, the construction and installation process has higher requirements, the phenomena of blockage and fracture are extremely easy to occur, in order to avoid blockage of air injection holes, an oxidation fan must continuously operate, and the requirements on the reliability of the fan are higher. The oxygen is a difficult-to-dissolve gas, and bubbles in the slurry entering the absorption tower through the pipe network type oxidation air pipe are larger, particularly under the low liquid level working condition, a large amount of large bubbles cannot be dissolved into the desulfurization slurry, the bubbles escape through the liquid level, the retention time of the bubbles in the slurry is shorter and is only 2.5-3.3 s, the utilization rate of dissolved oxygen of the oxidation air pipe system is lower and is only 25-33%, the energy consumption of the oxidation air pipe is improved, particularly in long-term operation, the phenomenon is aggravated due to the fact that the air bubbles are overlarge because the oxidation air pipe is blocked, the problems of breakage and the like are solved, the energy consumption of the oxidation air pipe is further improved, the energy conservation and consumption reduction of the oxidation air pipe have larger lifting space, and in the operation process of a desulfurization facility, how to avoid the blockage of the pipe network type oxidation air pipe and how to improve the utilization rate of oxidation air are important measures for reducing the energy consumption of the oxidation air pipe, and the technical problem that the pipe network type oxidation air system needs to be solved at present.
In order to solve the problem, in a wet desulfurization oxidation air duct device, as in application number 202020255671.3, the oxidation air duct comprises a vertical pipe, a main pipe and a plurality of branch pipes communicated with the main pipe, the main pipe is provided with an air inlet, one end of the vertical pipe is communicated with the air inlet of the main pipe, the other end of the vertical pipe passes through a desulfurization tower and is communicated with an air outlet of an oxidation fan arranged outside the desulfurization tower, a plurality of nozzles are arranged on each branch pipe at intervals, and all the nozzles are arranged with openings facing downwards. As can be seen from the construction, this patent uses a ductwork arrangement in combination with a spray head. The arrangement of the oxidation air pipes can effectively reduce the dead zone of the oxidation absorption tower, so that the oxidation air is uniformly distributed, and the oxidation efficiency is greatly improved; the nozzle can split the oxidized air into tiny bubbles, which is favorable for dissolution, increases the mass transfer coefficient and improves the absorption and oxidation efficiency of calcium sulfite slurry, thereby greatly improving the desulfurization and oxidation rate, improving the gypsum quality and reducing the unnecessary limestone consumption; the air quantity of the oxidation fan and the pressure of the oxidation fan are reduced, and the corresponding investment cost can be reduced.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a method for improving the oxidation efficiency in a wet desulfurization process, which is mainly used for solving the problems of air pipe blockage and low oxidation air utilization rate in the operation of a pipe network type oxidation air pipe.
In order to achieve the technical aim, the invention provides a method for improving oxidation efficiency in a wet desulfurization process, which increases the retention time of oxidized air and reduces the size of bubbles by retaining a crushing device.
Further, detain breaker, including a plurality of installations on the pipe network oxidation wind branch pipe, and be located the broken module of detaining on oxidation wind branch pipe upper portion, detain broken module and have set gradually installation zone, bubble detention zone, bubble crushing zone and bubble equipartition district on the baffle, the venthole of oxidation wind branch pipe is located the baffle below, the installation zone is used for fixing on the oxidation wind branch pipe, sets up a plurality of interval arrangement's broken hole along the parallel line with oxidation wind branch pipe axis on the baffle of bubble crushing zone, installs broken subassembly on broken hole, sets up a plurality of interval arrangement's air vent along the parallel line with oxidation wind branch pipe axis on the baffle of bubble equipartition zone, and the air vent has the aperture size that is less than the venthole.
Further, the air outlet holes, the crushing holes and the vent holes are arranged in a staggered manner.
Furthermore, the baffle uses the installation area as the middle area, and the two sides of the middle area are symmetrically provided with a bubble detention area, a bubble crushing area and a bubble uniform distribution area, the baffle where the bubble detention area, the bubble crushing area and the bubble uniform distribution area are located extends to the direction far away from the oxidation wind branch pipe to form suspension wings, and the suspension wings at the two sides of the oxidation wind branch pipe incline towards the oxidation wind branch pipe.
Furthermore, the baffle comprises an inner side plate, an outer side plate and two edge sealing plates, wherein the middle part of the inner side plate is connected with the outer circumference of the oxidation wind branch pipe, two vertical plates are arranged on two sides of the outer side plate and used for connecting two sides of the inner side plate, and the two edge sealing plates are respectively arranged on two end faces of the plate surrounded by the inner side plate and the outer side plate.
Furthermore, the cross-section structure of the inner side plate of the baffle is an arc shape positioned in the middle and six concave trapezoids positioned on two sides of the arc shape, and each side of the six concave trapezoids is provided with three concave trapezoids respectively corresponding to the bubble detention area, the bubble crushing area and the bubble uniform distribution area.
Further, the outer side plate of one side of the baffle, which is far away from the oxidation wind branch pipe, is a corrugated plate.
Further, the crushing assembly comprises a mounting plate, a hollow cone and two mounting holes, wherein the hollow cone comprises a plurality of sector surfaces and a central circular tube, the top of each sector surface is fixed on the central circular tube, the arc-shaped part of each sector surface is suspended, and a gap is reserved between two adjacent sector surfaces; the other end of the central circular tube is fixed on the mounting plate, the mounting hole is formed in the mounting plate and is arranged in a central symmetry mode through the hollow cone, the crushing assembly is fixed on the baffle plate through the mounting hole by bolts, and the hollow cone penetrates through the crushing hole.
Further, the retention and crushing device is applied to cooling tower cooling water atomization or rotary blowing atomization.
The beneficial technical effects of the invention are as follows: through setting up the oxidation wind detention breaker of span structure, not only improved the detention time of oxidation wind bubble, reduced the bubble size, can also effectively reduce the unit when changing the operating mode, the air feed volume under the different oxidation wind demand volume has improved the utilization ratio of oxidation air.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of an application structure of the present invention;
FIG. 2 is a schematic cross-sectional view of the retention and disruption module and oxidized wind branch pipe installation structure of the present invention;
FIG. 3 is a bottom view of the retention and disruption module and oxidized wind manifold mounting structure of the present invention;
FIG. 4 is a structural view of the crushing assembly of the present invention;
in the figure: 1. the device comprises an oxidation wind branch pipe, 2, an air outlet hole, 3, a detention crushing module, 4, a baffle, 5, a mounting area, 6, an outer plate, 7, an edge sealing plate, 8, a bubble detention area, 9, a bubble crushing area, 10, a bubble uniform distribution area, 11, an air vent, 12, a mounting hole, 13, a crushing hole, 14 and a fan-shaped surface.
Detailed Description
Example 1
A method for improving oxidation efficiency in wet desulfurization technology is characterized in that the retention time of oxidation wind is increased and the size of bubbles is reduced through a retention crushing device.
In this embodiment, only through the detention crushing device, the device can realize increasing the oxidation wind detention time, reduces the bubble size and can realize the improvement of oxidation efficiency.
Example 2
The 630MW unit desulfurization system is provided with a double-tower system, the first-stage tower and the second-stage tower both adopt pipe network type oxidation wind systems, the first-stage tower oxidation wind machine is 2 high-power Roots fans, the power of the oxidation wind machine is 450kW, the pressure head is 119.08kPa, the rated current is 55A, the output wind quantity of the Roots fans is not adjustable, the energy consumption is higher, and the problem that the oxidation wind branch pipes are blocked frequently occurs.
The oxidation of sulfite is an important reaction in the limestone-gypsum wet desulfurization process, and dissolved oxygen in desulfurization slurry of an absorption tower oxidizes the sulfite into sulfate, and the reaction formula is as follows:
(1)
(2)
the dissolved oxygen in the desulfurization slurry of the absorption tower comes from the air blown by the oxidation blower, wherein a small part of oxygen is dissolved into the slurry, and a large part of oxygen finally overflows out of the slurry tank to be mixed with the flue gas entering the desulfurization absorption tower, and a part of oxygen dissolved into the slurry is mixed with SO 3 2- The oxidation reaction is carried out, and the oxygen in the unreacted part is maintained to be SO 3 2- The greater the reaction driving force of oxidation and the greater the amount of bubbles dissolved in the slurry, the greater the oxygen content of the SO 3 2- The higher the reaction driving force of the oxidation, the higher the oxidation air utilization ratio, the smaller the air bubbles coming out of the oxidation wind branch pipe and the longer the residence time in the slurry, the higher the dissolution amount in the slurry. At present, the main reasons for low oxidation wind utilization rate are that the air pipes of a pipe network type oxidation wind system are blocked, the air bubbles are too large due to unreasonable air outlet arrangement, and the residence time of the air bubbles in the slurry is short, so that how to prevent the blocking of the oxidation air pipes, reduce the size of the air bubbles and improve the residence time of the air bubbles in the slurry is a technical key for improving the oxidation wind utilization rate of limestone-gypsum wet desulfurization facilities.
Therefore, as a specific design of the embodiment 1, we designed a pipe network type oxidation air pipe retention and crushing device, as shown in fig. 1, the retention and crushing modules 3 are arranged on the 7 oxidation air branch pipes 1, and the whole formed by the retention and crushing modules 3 is located at the upper part of the oxidation air branch pipes 1. As shown in fig. 2 and 3, the detention crushing module 3 comprises a baffle 4 with the thickness of 3mm, a mounting area 5, a bubble detention area 8, a bubble crushing area 9 and a bubble uniform distribution area 10 are sequentially arranged on the baffle 4, the air outlet holes 2 of the oxidation air branch pipes 1 are positioned below the baffle 4, the mounting area 5 is used for being fixed on the oxidation air branch pipes 1, crushing holes 13 which are arranged at intervals are arranged on the baffle of the bubble crushing area 9 along parallel lines with the axes of the oxidation air branch pipes, crushing components are arranged on the crushing holes 13, a plurality of ventilation holes 11 which are arranged at intervals are arranged on the baffle of the bubble uniform distribution area 10 along parallel lines with the axes of the oxidation air branch pipes, and the ventilation holes 11 have the aperture size smaller than the aperture size of the air outlet holes 2.
The baffle 4 is a plate body with a certain thickness, which is formed by connecting an inner side plate, an outer side plate 6 and two edge sealing plates 7, and is 3mm in the embodiment, wherein the middle part of the inner side plate is connected with the outer circumference of the oxidation wind branch pipe 1, two vertical plates are arranged on two sides of the outer side plate 6 and are used for connecting two sides of the inner side plate, and the two edge sealing plates 7 are respectively arranged on two end faces of the plate surrounded by the inner side plate and the outer side plate 6.
The embodiment adopts a modularized assembly design, a plurality of groups of modules are distributed on the whole branch pipe along the axial direction of the oxidized wind branch pipe, the baffle 4 adopts a partition design, the bubble detention area 8, the bubble crushing area 9 and the bubble uniform distribution area 10 divide the area into three stages, wherein the bubble detention area 8 close to the oxidized wind branch pipe is a first stage wingspan baffle, a second stage and a third stage are arranged outwards in sequence, and the first stage wingspan baffle is provided with no vent hole and is a bubble detention area; crushing holes 13 with a certain size are formed in the convex parts of the second-stage span baffle at equal intervals, the crushing holes 13 are linearly arranged at the convex parts, and a bubble crushing assembly is additionally arranged in each crushing hole 13; the bulges of the third-stage span baffle are only provided with round vent holes with certain size, and a bubble breaking unit is not additionally arranged.
The large-size air bubbles entering the slurry through the air outlet holes 2 of the air oxidation branch pipes are in the rising process in the slurry, the residence time of the bubbles in the slurry is prolonged under the blocking action of the residence crushing device, the large-size air bubbles entering the slurry through the air oxidation branch pipes are firstly gathered in the bubble residence area of the baffle of the residence crushing device, after the large bubbles are filled in the area, excessive large bubbles sequentially enter the bubble crushing area, the large bubbles are physically divided into independent small bubbles in the crushing assembly of the crushing area, the volume of the bubbles is reduced, the contact area between the bubbles and the slurry is increased, the residence time of the bubbles in the slurry is further prolonged under the resistance action of the crushing area, most of the air bubbles continue to rise in the slurry through the bubble crushing area when the unit is in low load and in low oxidation wind demand, the excessive bubbles are not in time of the bubble crushing area, and enter the bubble crushing area in sequence after the air crushing area, continue to rise in the slurry, the trace bubbles escape through the edge part after the air bubbles are in sequence, the residence crushing device not only improves the residence time of oxidation wind, the size of the air bubbles is reduced, the air supply rate is improved when the unit is in the same air supply condition, and the oxidation wind supply rate is reduced.
Example 3
As a specific design, as shown in fig. 2, the baffle 4 uses the installation area 5 as a middle area, the air bubble detention area 8, the air bubble breaking area 9 and the air bubble uniform distribution area 10 are symmetrically arranged at two sides of the middle area 5, the baffle where the air bubble detention area 8, the air bubble breaking area 9 and the air bubble uniform distribution area 10 are located extends to a direction far away from the oxidation wind branch pipe 1 to form suspension wings, and the suspension wings at two sides of the oxidation wind branch pipe 1 are inclined towards the oxidation wind branch pipe.
The cross-sectional structure of the inner side plate of the baffle plate 4 is an arc shape positioned in the middle and six concave trapezoids positioned on two sides of the arc shape, and each side of the six concave trapezoids is respectively provided with three concave trapezoids which respectively correspond to the bubble detention area 8, the bubble crushing area 9 and the bubble uniform distribution area 10.
Experiments show that most of the oxidation air entering the slurry through the outlet holes 2 of the oxidation air branch pipes enters the slurry through the bubble detention zone 8, the bubble crushing zone 9 and the bubble uniform distribution zone 10, the detention time of the bubbles in the slurry pool is about 8.6s, and the detention time of the bubbles is longer than 7.7s without the concave trapezoid scheme.
The outer side plate 6 of the baffle plate 4 is a corrugated plate for assisting in bubble retention.
Example 4
As a specific design, as shown in fig. 4, the crushing assembly comprises a mounting plate, a hollow cone and two mounting holes 12, wherein the hollow cone comprises a plurality of sector surfaces 14 and a central circular tube, the top of the sector surface 14 is fixed on the central circular tube, the arc-shaped part of the sector surface 14 is suspended, and a gap is reserved between two adjacent sector surfaces 14; the other end of the center circular tube is fixed on the mounting plate, the mounting hole is formed in the mounting plate and is arranged in a central symmetry mode through the hollow cone, the crushing assembly is fixed on the baffle plate through the mounting hole by bolts, and the hollow cone penetrates through the crushing hole 13.
The crushing assembly is integrally formed by adopting an abrasive tool injection molding process, the material is reinforced PP, the hollow cone crushing hole is formed by 5 variable-section fan-shaped cones with 45 degrees, the cone top is circumscribed on the inner wall of the circular tube, the cone bottom is suspended, the crushing assembly is fixed on the span baffle plate through a bolt by a mounting hole, and the air outlet holes 2 of the oxidized air branch pipes are staggered with the crushing holes and the air vent holes of the crushing device.
The large-size bubbles entering the slurry from the outlet holes of the air oxidation branch pipes are firstly gathered in the bubble retention area 8 in the rising process of the slurry, after the large bubbles are filled in the area, excessive large bubbles sequentially enter the bubble breaking area 9, the large bubbles are physically divided into independent small bubbles by the variable cross-section cone in the hollow cone breaking holes of the breaking area, the volume of the bubbles is reduced, the contact area between the bubbles and the slurry is increased, the residence time of the bubbles in the slurry is further improved under the resistance action of the breaking area, when the unit is low in load and low in air oxidation demand, most of air bubbles continuously rise in the slurry through the bubble breaking area, when the unit is high in load and high in air oxidation demand, excessive bubbles can bypass the bubble breaking area to enter the bubble uniform distribution area, and then continuously rise in the slurry through the ventilation holes of the uniform distribution area, and the trace bubbles escape through the span area and the edge part of the edge seal plate.
As an expansion, the device and the method for detenting and crushing the oxidized wind are not only suitable for bubble crushing scenes in the oxidation process of desulfurization slurry, but also suitable for crushing scenes of liquid drops, such as cooling water atomization of a cooling tower, rotary blowing atomization and the like. An oxidation air retention and crushing device is additionally arranged below the cooling tower atomizing nozzle, and atomized liquid drops are crushed into small liquid drops under the crushing action of the oxidation air retention and crushing device, so that the heat transfer efficiency of the liquid drops is effectively improved.
The invention adopts the retention of the oxidation air and the bubble breaking, obviously improves the retention time of the oxidation air in the slurry, effectively reduces the bubble size of the outlet of the oxidation air pipe, and improves the contact area and the contact time of the bubbles and the desulfurization slurry, thereby improving the utilization rate of the oxidation air.
The above embodiments are merely illustrative of the technical solutions of the present invention, but not limiting, and all simple modifications on the basis of the present invention are within the scope of the present invention.
Claims (6)
1. A method for improving oxidation efficiency in wet desulfurization process is characterized in that: the device comprises a plurality of detention crushing modules which are arranged on pipe network type air oxidation branch pipes and positioned at the upper parts of the air oxidation branch pipes, wherein each detention crushing module comprises a baffle plate, an installation area, an air bubble detention area, an air bubble crushing area and an air bubble uniformly-distributed area are sequentially arranged on the baffle plate, air outlets of the air oxidation branch pipes are positioned below the baffle plate, the installation area is used for being fixed on the air oxidation branch pipes, a plurality of crushing holes which are arranged at intervals are arranged on the baffle plate of the air bubble crushing area along parallel lines with the axes of the air oxidation branch pipes, a plurality of ventilation holes which are arranged at intervals are arranged on the baffle plate of the air bubble uniformly-distributed area along parallel lines with the axes of the air oxidation branch pipes, and the ventilation holes have aperture sizes smaller than the air outlets; the baffle uses the installation zone as the intermediate zone, sets up bubble detention district, bubble crushing district, bubble equipartition district in this intermediate zone bilateral symmetry, bubble detention district, bubble crushing district and bubble equipartition district place the baffle to the direction extension that keeps away from the oxidation wind branch pipe forms the suspension wing, and the suspension wing of oxidation wind branch pipe both sides all inclines towards oxidation wind branch pipe.
2. The method for improving oxidation efficiency in a wet desulfurization process according to claim 1, wherein: the air outlet holes, the crushing holes and the vent holes are arranged in a staggered manner.
3. The method for improving oxidation efficiency in a wet desulfurization process according to claim 1, wherein: the baffle comprises interior curb plate, outer panel and two marginal shrouding connection, and wherein the middle part of interior curb plate is connected with the outside circumference of oxidation wind branch pipe, and the outer panel both sides all set up a vertical board and are used for connecting the both sides of interior curb plate, and two marginal shrouding are installed respectively on the board both ends face that interior curb plate and outer panel enclose.
4. A method for increasing oxidation efficiency in a wet desulfurization process according to claim 3, characterized in that: the cross-sectional structure of baffle interior side plate is the arc that is located the middle part and is located six indent trapezoids of arc both sides, and six indent trapezoids each side sets up three respectively, corresponds bubble detention district, bubble crushing district and bubble equipartition district respectively.
5. A method for increasing oxidation efficiency in a wet desulfurization process according to claim 3, characterized in that: the outer side plate of the baffle is a corrugated plate.
6. The method for improving oxidation efficiency in a wet desulfurization process according to claim 1, wherein: the crushing assembly comprises a mounting plate, a hollow cone and two mounting holes, wherein the hollow cone comprises a plurality of sector surfaces and a central circular tube, the tops of the sector surfaces are fixed on the central circular tube, the arc-shaped parts of the sector surfaces are suspended, and a gap is reserved between two adjacent sector surfaces; the other end of the central circular tube is fixed on the mounting plate, the mounting hole is formed in the mounting plate and is arranged in a central symmetry mode through the hollow cone, the crushing assembly is fixed on the baffle plate through the mounting hole by bolts, and the hollow cone penetrates through the crushing hole.
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| CN202210977738.8A CN115414776B (en) | 2022-08-16 | 2022-08-16 | Method for improving oxidation efficiency in wet desulfurization process |
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| CN115414776B true CN115414776B (en) | 2023-07-18 |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000317259A (en) * | 1999-05-11 | 2000-11-21 | Ishikawajima Harima Heavy Ind Co Ltd | Flue gas desulfurization equipment |
| CN201346458Y (en) * | 2008-12-30 | 2009-11-18 | 中电投远达环保工程有限公司 | Oxygenized air conveyer pipe with air bubble breaking device |
| CN107670618A (en) * | 2017-10-24 | 2018-02-09 | 徐州市全中电力科技有限公司 | A kind of array oxidation wind induction system |
| CN209968100U (en) * | 2019-04-25 | 2020-01-21 | 吴瑞昌 | Desulfurization slurry oxidation reaction multiplier |
| US11185817B2 (en) * | 2019-05-08 | 2021-11-30 | Jiangsu Cohen Environmental Protection Co. Ltd. | Ammonia-based multi-zone double-loop process for ultralow emission of multi-pollutant |
| CN211384488U (en) * | 2019-11-28 | 2020-09-01 | 山东海科环保科技有限公司 | High-efficient oxidation unit of desulfurization |
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