CN215742824U - Flue gas desulfurization tower with rectifying device - Google Patents
Flue gas desulfurization tower with rectifying device Download PDFInfo
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- CN215742824U CN215742824U CN202121990985.9U CN202121990985U CN215742824U CN 215742824 U CN215742824 U CN 215742824U CN 202121990985 U CN202121990985 U CN 202121990985U CN 215742824 U CN215742824 U CN 215742824U
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Abstract
The utility model provides a flue gas desulfurization tower with a rectifying device, which improves the desulfurization efficiency and saves the energy consumption. A flue gas desulfurization tower with a rectifying device comprises: the upper part of the tower body is provided with a flue gas outlet, the lower part of the tower body is provided with a flue gas inlet, and the bottom of the tower body is provided with a slurry pool; the rectifying device is connected with the inner wall of the tower body, is used for guiding and rectifying the flue gas entering from the flue gas inlet, and comprises a plurality of rectifying blades and a plurality of supporting beams for fixing the rectifying blades, and the rectifying blades are intersected with the supporting beams; the spraying device is used for spraying the slurry to the flue gas; the demisting device is used for trapping fog drops in the flue gas; the rectifying device, the spraying device and the demisting device are sequentially arranged in the tower body. The rectifying device in the flue gas desulfurization tower with the rectifying device has the advantages of simple structure and convenience in processing and installation, and can be used for conducting flow guiding and rectifying action on flue gas entering the tower, eliminating large eddy, improving desulfurization efficiency, reducing system resistance and reducing energy consumption.
Description
Technical Field
The utility model relates to a flue gas treatment device, in particular to a flue gas desulfurization tower with a rectifying device, and belongs to the technical field of environment-friendly equipment.
Background
In recent yearsThe atmospheric environmental pollution problem is increasingly prominent and harms human health, the pollutant sulfur dioxide is one of the main control targets of atmospheric pollution emission in China, and the coal-fired boiler is used as the first energy-consuming household of coal and is also the main source of sulfur dioxide emission. Along with the coming of environmental protection policy, the control standard of the sulfur dioxide in the flue gas of the coal-fired boiler is higher and higher, especially under the condition of implementing the ultra-low emission requirement (SO) of the coal-fired boiler of the coal-fired power plant2≤35mg/Nm3,NOx≤50mg/Nm3Smoke dust less than or equal to 5mg/Nm3) There is a continuing need for improvements in sulfur dioxide control technology.
The wet desulfurization technology, especially the limestone-gypsum desulfurization technology, is a main desulfurization technology of coal-fired boilers under the requirement of ultralow emission due to the reasons of high desulfurization efficiency, stable and reliable technology, rich limestone source, low price and the like. Limestone is used as a desulfurizing agent in the limestone-gypsum method desulfurization technology, and the limestone is crushed and ground into powder to be mixed with water to prepare absorption slurry. In the desulfurizing tower, absorbing slurry is pumped to a spraying layer by a slurry circulating pump, atomized into liquid drops through a nozzle and contacted and mixed with countercurrent flue gas, sulfur dioxide in the flue gas reacts with calcium carbonate in the slurry, the reacted slurry falls into a slurry pool and reacts with oxidizing air to form gypsum, and finally the gypsum is discharged out of the tower through a gypsum discharge pump; the flue gas flows out of the desulfurizing tower after being sprayed by the spraying layer and the demister to remove larger liquid drops, and then enters downstream equipment. The desulfurizing tower can remove part of smoke and dust and other pollutants while removing sulfur dioxide.
The key equipment of limestone-gypsum method desulfurization technique is desulfurizing tower, in which various physical and chemical reactions are mainly carried out. The currently used forms of the desulfurization tower are three types, namely an empty tower, a tray tower and a rotary coupling desulfurization tower. The traditional limestone-gypsum desulfurization tower generally adopts an empty tower form, namely, no diversion or rectification component is arranged below a spray layer and above a slurry pool, after flue gas enters the desulfurization tower from an inlet of the desulfurization tower, strong vortex is formed between the spray layer at the lower layer and the slurry pool, high-speed airflow is formed on the side of the tower wall opposite to the inlet of the desulfurization tower due to the inertia effect of the flue gas, the side wall surface close to the inlet of the desulfurization tower has relatively low speed, the speed distribution of the airflow entering the spray layer is extremely uneven, short circuit is easily formed at the position of the tower wall, and a large amount of flue gas is directly discharged out of the tower without being fully washed by spray slurry, so that the desulfurization efficiency of the desulfurization tower is low.
In order to solve the problem of low desulfurization efficiency of an empty tower, the most common desulfurization tower technology at present is to add one or two layers of trays in the tower. After the tray is arranged in the tower, the liquid holding layer with a certain thickness is formed on the tray, and the desulfurization efficiency is improved after the flue gas is uniformly distributed through the airflow of the tray and the washing of the liquid holding layer. However, the tray tower has the disadvantages of high desulfurization efficiency and obvious disadvantages because the resistance in the tower is increased sharply after the tray is added, the energy consumption is high, the tray is easy to block, and the maintenance workload is increased. In addition, the desulfurization efficiency of part of tray towers is too high in actual operation and is far higher than the ultralow emission standard, so that unnecessary energy waste is caused.
The utility model discloses a chinese utility model with application number 201220352645.8 discloses a flue gas rectifying device of a flue gas desulfurization tower, which comprises a tower wall and a flue inlet, and further comprises a rectifying plate and a rectifying plate support, wherein the rectifying plate is provided with a plurality of holes with different sizes and shapes, the rectifying plate support is of a frame structure, the outer frame of the rectifying plate support is matched with the rectifying plate, the rectifying plate is fixed on the rectifying plate support, and the rectifying plate support is arranged in the tower and forms an included angle alpha with the horizontal direction, and the whole body inclines inwards; the included angle between the rectifying plate and the horizontal plane is 5-10 degrees, and the whole rectifying plate is crescent. Above-mentioned flue gas fairing makes the flue gas flow change through the mode of applying resistance, but because it only sets up fairing about the horizontal cross sectional area half of desulfurizing tower, high-speed air current is except that the part upwards flows through the trompil, and other air currents are walked around the fairing edge and are formed high-speed air current, and do not have the fairing side originally lower air current and can not improve, consequently actual rectification effect is poor, and the air current homogeneity is poor, even is poor in the empty tower that does not set up fairing.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a flue gas desulfurization tower with a rectifying device, which improves the desulfurization efficiency and saves energy consumption.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
a flue gas desulfurization tower with a rectifying device comprises:
the upper part of the tower body is provided with a flue gas outlet, the lower part of the tower body is provided with a flue gas inlet, and the bottom of the tower body is provided with a slurry pool;
the rectifying device is connected with the inner wall of the tower body, is used for guiding and rectifying the flue gas entering from the flue gas inlet, and comprises a plurality of rectifying blades and a plurality of supporting beams for fixing the rectifying blades, and the rectifying device and the radial plane of the tower body form an included angle, and the included angle is 10-45 degrees;
the spraying device is used for spraying the slurry to the flue gas;
the demisting device is used for trapping fog drops in the flue gas;
the rectifying device, the spraying device and the demisting device are sequentially arranged in the tower body.
Preferably, the flue gas inlet is arranged between the spraying device and the slurry pool, and the rectifying device is arranged between the spraying device and the flue gas inlet.
Preferably, the ratio of the distance between adjacent rectifying blades to the height of the rectifying blades ranges from 1: 1-1: 4.
preferably, the rectifying blades are uniformly spaced.
Preferably, the flow-straightening blades are one or more of straight plate-shaped blades, folded plate-shaped blades and arc-shaped blades, and the flow-straightening blades are made of stainless steel or glass fiber reinforced plastic materials.
Preferably, the height of the rectifying blades is not more than 3m, and the distance between adjacent rectifying blades is not more than 2.5 m.
Preferably, the height of the rectifying blades is not more than 2m, and the distance between adjacent rectifying blades is not more than 1.5 m.
Preferably, the supporting beam is fixedly connected with the inner wall of the tower body, and the rectifying blades are fixed in the tower body through the supporting beam.
Preferably, the support beam is one or more of I-steel, flat steel, round steel and channel steel, and the support beam is made of stainless steel material.
Preferably, the spraying device comprises a plurality of spraying layers, and the number of the spraying layers is 2-6.
Preferably, the demister is a ridge demister or a tube bundle demister.
The utility model has the beneficial effects that:
(1) the rectifying device has simple structure and convenient processing and installation, performs diversion and rectification functions on flue gas entering the tower, eliminates large eddy, improves the desulfurization efficiency, reduces the system resistance and reduces the energy consumption;
(2) compared with the traditional empty spray tower, the utility model has the advantages that the desulfurization efficiency and the dust removal efficiency are improved, and compared with a tray tower or a rotary convergence coupling technology tower, the utility model has the advantages of simple structure, convenient maintenance, greatly reduced system resistance and energy consumption saving;
(3) the flue gas desulfurization tower with the rectifying device can be used for transforming the traditional empty tower spray tower to realize ultralow emission, particularly for a coal-fired unit using middle and low-sulfur coal as fuel, has the characteristics of small transformation amount, short transformation time and low cost, and obviously improves the desulfurization efficiency under the condition of not changing other auxiliary machine systems.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural view of embodiment 1 of the present invention;
FIG. 2 is a schematic structural view of a rectifying apparatus according to embodiment 1 of the present invention;
FIG. 3 is a schematic side view of a rectifying device according to embodiment 1 of the present invention;
FIG. 4 is a schematic structural view of embodiment 2 of the present invention;
FIG. 5 is a schematic side view of a rectifying device according to embodiment 2 of the present invention;
FIG. 6 is a schematic structural view of embodiment 3 of the present invention;
FIG. 7 is a schematic structural view of comparative example 1 of the present invention;
FIG. 8 is a schematic structural view of comparative example 2 of the present invention;
FIG. 9 is a gas-liquid two-phase flow simulation calculation chart of comparative example 1 of the present invention;
FIG. 10 is a gas-liquid two-phase flow simulation calculation chart of comparative example 2 of the present invention;
FIG. 11 is a gas-liquid two-phase flow simulation calculation chart according to example 3 of the present invention.
In the figure: 1. flue gas entry 2, tower body, 3, thick liquid pond, 4, fairing, 5, spray set, 6, defogging device, 7, exhanst gas outlet, 41, rectification blade, 42, supporting beam.
Detailed Description
The technical solution of the present invention is further specifically described below by way of specific examples in conjunction with the accompanying drawings. It is to be understood that the practice of the utility model is not limited to the following examples, and that any variations and/or modifications may be made thereto without departing from the scope of the utility model.
In the present invention, all parts and percentages are by weight, unless otherwise specified, and the equipment and materials used are commercially available or commonly used in the art. The methods in the following examples are conventional in the art unless otherwise specified. The components or devices in the following examples are, unless otherwise specified, standard parts or parts known to those skilled in the art, the structure and principle of which are known to those skilled in the art through technical manuals or through routine experimentation.
Example 1:
a flue gas desulfurization tower with a rectifying device as shown in fig. 1 and 2 comprises: the upper part of the tower body 2 is provided with a flue gas outlet 7, the lower part is provided with a flue gas inlet 1, and the bottom is provided with a slurry pool 3; the rectifying device 4 is connected with the inner wall of the tower body 2, is used for guiding and rectifying the flue gas entering from the flue gas inlet 1, and comprises a plurality of rectifying blades 41 and a plurality of supporting beams 42 for fixing the rectifying blades 41, and the rectifying blades 41 are intersected with the supporting beams 42; the spraying device 5 is used for spraying the slurry to the flue gas; and the demisting device 6 is used for trapping the fog drops in the flue gas. The rectifying device 4, the spraying device 5 and the demisting device 6 are sequentially arranged in the tower body 2.
Specifically, in the flue gas desulfurization tower with the rectifying device of the present embodiment, the inner diameter of the tower is 15m, and as shown in fig. 3, the rectifying device 4 is disposed at an angle α with respect to the radial plane of the tower body, where α is 18 °, and the rectifying device 4 is disposed between the slurry pool 3 and the spraying device 5 and fixed in the tower body 2.
The fairing 4 consists of 9 fairing blades 41 and 4 support beams 42. The shape of the rectifying blades 41 is a straight plate-shaped blade, the height of each rectifying blade 41 is 2m, and the distance between two adjacent rectifying blades 41 is 1.5 m. The support beam 42 is made of flat steel, and the support beam 42 penetrates the rectifying blade 41 and welds the rectifying blade 41 to the support beam 42. The straightening vanes 41 and the support beams 42 are made of stainless steel.
The spraying device 5 has 4 spraying layers, and the distance between every two spraying layers is 2.0 m. The center of the lower three spraying layers adopts a bidirectional nozzle and the wall surface adopts a unidirectional downward nozzle form, and the uppermost spraying layer adopts a unidirectional downward nozzle. The spray nozzles of each layer of spray layer are combined by hollow cone and solid cone nozzles. The coverage rate of each layer of spraying slurry reaches more than 260 percent. The liquid-gas ratio reaches 15L/m3And the pH value of the slurry is 5.2-5.8.
In this embodiment, SO at the flue gas inlet 12The concentration is 1800mg/Nm3After the flue gas is desulfurized by the flue gas desulfurization tower with the rectifying device 4 and the rectifying device, the concentration of SO2 at the flue gas outlet 7 is less than 35mg/Nm3And the requirement of ultra-low emission is met.
According to the technical scheme, the rectifying device 4 is connected with the inner wall of the tower body 2 and covers the radial cross section in the whole tower body, flue gas enters the tower body 2 from the flue gas inlet 1, vertically enters the lower part of the spraying device 5 in a more uniform speed distribution state through the flow guiding and rectifying effects of the rectifying device 4 and is in countercurrent contact with slurry sprayed by the spraying device 5, the flue gas is washed by the sprayed slurry, sulfur dioxide, smoke dust and other chemical elements fall into the slurry pool 3 along with liquid drops after being washed, the flue gas reacts with air blown by an external oxidation fan in the slurry pool 3, and finally gypsum is generated and discharged out of the tower body 2; most of liquid drops of the washed purified flue gas are removed by the demisting device 6, and then the cleaned purified flue gas is discharged out of the tower body 2 through the flue gas outlet 7 and enters the next-stage equipment.
Example 2:
fig. 4 shows a flue gas desulfurization tower with a rectifying device, which comprises: the upper part of the tower body 2 is provided with a flue gas outlet 7, the lower part is provided with a flue gas inlet 1, and the bottom is provided with a slurry pool 3; the rectifying device 4 is connected with the inner wall of the tower body 2, is used for guiding and rectifying the flue gas entering from the flue gas inlet 1, and comprises a plurality of rectifying blades 41 and a plurality of supporting beams 42 for fixing the rectifying blades 41, and the rectifying blades 41 are intersected with the supporting beams 42; the spraying device 5 is used for spraying the slurry to the flue gas; and the demisting device 6 is used for trapping the fog drops in the flue gas. The rectifying device 4, the spraying device 5 and the demisting device 6 are sequentially arranged in the tower body 2.
In this embodiment, the tower internal diameter is 13m, and fairing 4 and the radial plane of tower body are the contained angle α setting, and wherein α 20 °, fairing 4 sets up between thick liquid pond 3 and spray set 5 to welded fastening is in tower body 2. As shown in fig. 5, the straightening vane 41 is a combination of 8 straight-plate-shaped vanes and 8 arc-shaped vanes, wherein the straight-plate-shaped vanes are located above the support beams 42, the arc-shaped vanes are located below the support beams 42, and one straight-plate-shaped vane is located below the corresponding arc-shaped vane. The overall height of a single rectifying blade 41 is 2.5m, the rectifying blades 41 are uniformly arranged at intervals, and the distance between every two adjacent rectifying blades 41 is 1.4 m. The support beam 42 is formed by 4 i-beams passing through the straightening vane 41 and welded to the straightening vane 41. The rectifying blades 41 and the support beams 42 are made of stainless steel.
Spraying deviceThe device 5 has 5 spraying layers, and the distance between every two spraying layers is 1.8 m. The spray nozzles of the spray layer adopt hollow cones and solid cones, and the nozzles are formed by combining one-way nozzles and two-way nozzles, the coverage rate of spray slurry reaches 280 percent, and the liquid-gas ratio reaches 18L/m3The pH value of the slurry is 5.2-5.8.
The defogging device 6 is two-layer defroster, and the upper demister is the ridge defroster, and lower floor's defroster is the tube bank defroster.
In this embodiment, the spray tower is an empty spray tower before modification, the flue gas flow rate of the upstream section of the lowermost spray layer has a relative standard deviation Cv of 58%, and after the modification by providing the rectifying device 4, the section flow rate Cv is 27%. The SO2 concentration at the flue gas inlet is 2500mg/Nm3After the desulfurization of the flue gas desulfurization tower with the rectifying device 4 and the rectifying device, the desulfurization efficiency reaches 99 percent, and the requirement of ultralow emission is met.
The calculation method of the relative standard deviation Cv is as follows:
wherein:
said C isVIs a section relative standard deviation (%), the sigma is a section standard deviation, and the
Is the average value of the cross section.
According to the technical scheme, the rectifying device 4 is connected with the inner wall of the tower body 2 and covers the radial cross section in the whole tower body, flue gas enters the tower body 2 from the flue gas inlet 1, vertically enters the lower part of the spraying device 5 in a more uniform speed distribution state through the flow guiding and rectifying effects of the rectifying device 4 and is in countercurrent contact with slurry sprayed by the spraying device 5, the flue gas is washed by the sprayed slurry, sulfur dioxide, smoke dust and other chemical elements fall into the slurry pool 3 along with liquid drops after being washed, the flue gas reacts with air blown by an external oxidation fan in the slurry pool 3, and finally gypsum is generated and discharged out of the tower body 2; most of liquid drops of the washed purified flue gas are removed by the demisting device 6, and then the cleaned purified flue gas is discharged out of the tower body 2 through the flue gas outlet 7 and enters the next-stage equipment. The flue gas desulfurization tower with the rectifying device has the advantages of simple structure, convenience in installation and maintenance, high desulfurization efficiency and low system resistance, belongs to a low-resistance high-efficiency desulfurization tower, and meets the requirements of energy conservation and environmental protection.
Example 3:
the utility model provides a take fairing's flue gas desulfurization tower, technical scheme is with embodiment 2, its difference lies in:
as shown in fig. 6, the rectifying device 4 is composed of 15 straight plate-shaped rectifying blades 41 and support beams 42, the height of each rectifying blade 41 is 1.6m, the distance between two adjacent rectifying blades 41 is 1m, and the rectifying device 4 is welded in the desulfurizing tower body 2 at an inclination angle α of 26 ° with respect to the radial plane of the tower body.
This embodiment reforms transform the flue gas desulfurization tower to certain coal fired power plant 600MW unit, and former desulfurizing tower is the empty tower, and the shaft diameter is 16m, and spray set 5 adopts the layer of spraying of 3+1 to arrange in the desulfurizing tower, and defogging device 6 is two-layer ridge defroster.
Comparative example 1:
the technical scheme of the flue gas desulfurization tower is the same as that in the embodiment 3, and the difference is that:
as shown in fig. 7, in the form of an empty tower, no rectifying device 4 is provided in the tower body 2.
Comparative example 2:
the utility model provides a take fairing's flue gas desulfurization tower, technical scheme is with embodiment 3, its difference lies in:
as shown in fig. 8, the rectifying device in the tower body 2 adopts a flue gas rectifying device of a flue gas desulfurization tower with a rectifying device disclosed in the chinese utility model with application number 201220352645.8, and is designed in a manner of opening a circular hole and an elliptical hole on a crescent plate, and is arranged in the tower body 2 at an inclination angle α of 8 ° with the radial plane of the tower body, and the rectifying device covers about half of the radial cross-sectional area of the tower body 2.
Comparative calculations were performed on the flue gas desulfurization towers with a rectifying device of example 3, comparative example 1 and comparative example 2 by CFD simulation. And respectively carrying out gas-liquid two-phase flow simulation calculation on the three forms of the flue gas desulfurization towers, wherein the simulation results mainly compare the section speeds of the inlets of the spraying layers positioned at the lowest layer. As can be seen from fig. 9, the lowermost spray level inlet cross-sectional velocity Cv of comparative example 1 was 63.9%; as can be seen from fig. 10, the inlet cross-sectional velocity Cv of the lowermost spray layer of comparative example 2 is 79.8%, which not only does not promote the velocity uniformity distribution, but also aggravates the velocity non-uniformity; finally, by adopting the flue gas desulfurization tower with the rectifying device, which is provided with the rectifying device 4, the velocity Cv of the section of the inlet of the lowest spraying layer is 20.3 percent, which is greatly superior to the performances of the two flue gas desulfurization towers, even superior to the tray tower, and the flue gas distribution in the tower is uniform, so that the flue gas distribution requirement under the ultralow emission requirement is completely met. Meanwhile, the pressure drop of the system of the flue gas desulfurization tower with the rectifying device is superior to that of the two flue gas desulfurization towers, and the pressure drop is respectively reduced by 55Pa and 125 Pa. Therefore, the flue gas desulfurization tower with the rectifying device has the good effects of uniformly distributing air flow and reducing system resistance, can effectively improve the desulfurization efficiency, and can meet the requirement of ultralow emission.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the utility model as set forth in the claims.
Claims (10)
1. The utility model provides a take fairing's flue gas desulfurization tower which characterized in that: this take fairing's flue gas desulfurization tower includes:
the upper part of the tower body (2) is provided with a flue gas outlet (7), the lower part of the tower body is provided with a flue gas inlet (1), and the bottom of the tower body is provided with a slurry pool (3);
the rectifying device (4) is connected with the inner wall of the tower body (2) and used for guiding and rectifying the flue gas entering from the flue gas inlet (1), and comprises a plurality of rectifying blades (41) and a plurality of supporting beams (42) for fixing the rectifying blades (41), wherein the rectifying blades (41) are intersected with the supporting beams (42), the rectifying device (4) and the radial plane of the tower body (2) form an included angle, and the included angle is 10-45 degrees;
the spraying device (5) is used for spraying the slurry to the flue gas;
the demisting device (6) is used for trapping fog drops in the flue gas;
the rectifying device (4), the spraying device (5) and the demisting device (6) are sequentially arranged in the tower body (2).
2. The flue gas desulfurization tower with the rectifying device according to claim 1, wherein: the flue gas inlet (1) is arranged between the spraying device (5) and the slurry pool (3), and the rectifying device (4) is arranged between the spraying device (5) and the flue gas inlet (1).
3. The flue gas desulfurization tower with the rectifying device according to claim 1, wherein: the ratio of the distance between adjacent rectifying blades (41) to the height of the rectifying blades (41) ranges from 1: 1-1: 4.
4. the flue gas desulfurization tower with the rectifying device according to claim 1, wherein: the rectifying blades (41) are arranged at even intervals.
5. The flue gas desulfurization tower with the rectifying device according to claim 1, wherein: the flow-straightening blades (41) are one or more of straight plate-shaped blades, folded plate-shaped blades and arc-shaped blades, and the flow-straightening blades (41) are made of stainless steel or glass fiber reinforced plastic materials.
6. The flue gas desulfurization tower with the rectifying device according to claim 1, wherein: the height of the rectifying blades (41) is not more than 3m, and the distance between adjacent rectifying blades (41) is not more than 2.5 m.
7. The flue gas desulfurization tower with the rectifying device according to claim 1, wherein: the supporting beam (42) is fixedly connected with the inner wall of the tower body (2), and the rectifying blades (41) are fixed in the tower body (2) through the supporting beam (42).
8. The flue gas desulfurization tower with the rectifying device according to claim 1, wherein: the supporting beam (42) is one or more of I-shaped steel, flat steel, round steel and channel steel, and the supporting beam (42) is made of stainless steel materials.
9. The flue gas desulfurization tower with the rectifying device according to claim 1, wherein: the spraying device (5) comprises a plurality of spraying layers, and the number of the spraying layers is 2-6.
10. The flue gas desulfurization tower with the rectifying device according to claim 1, wherein: the demisting device (6) is a ridge demister or a tube bundle demister.
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| CN113750773A (en) * | 2021-08-23 | 2021-12-07 | 浙江大学能源工程设计研究院有限公司 | Flue gas desulfurization tower |
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