CN105056737B - A kind of device for desulfurization - Google Patents

A kind of device for desulfurization Download PDF

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Publication number
CN105056737B
CN105056737B CN201510505988.1A CN201510505988A CN105056737B CN 105056737 B CN105056737 B CN 105056737B CN 201510505988 A CN201510505988 A CN 201510505988A CN 105056737 B CN105056737 B CN 105056737B
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desulfurization
ammonia water
flue gas
spiral groove
shell
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CN105056737A (en
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吴云梦
李川
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Guizhou Chuangqi Environmental Protection Technology Co ltd
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Guizhou Chuangqi Environmental Protection Technology Co Ltd
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Abstract

A kind of device for desulfurization, for removing sulfur dioxide and flue dust in coal-fired flue-gas, the device for desulfurization includes the housing of the cylinder type of a lateral arrangement;The inner lower of the housing accommodates ammoniacal liquor, the axis direction of the housing is provided with a drive shaft, multiple filtering rotating disks have been arranged side by side in the drive shaft, the plane of rotation of the filtering rotating disk have been provided with helicla flute, at least one side of the helicla flute is provided with filter net cloth;The both sides of neighbouring each filtering rotating disk are provided with two ring baffles parallel to the filtering rotating disk.The device for desulfurization of the present invention is by using the filtering rotating disk with helical groove structure; substantially increase the contact area of flue gas and ammoniacal liquor; improve efficiency of dust collection; it can further avoid periodically shutting down cleaning fouling in the case of without additionally setting cleaning device; the device for desulfurization of the present invention is allowd to continue Effec-tive Function; ammonia volume has been saved, has reduced cost.

Description

Device for desulfurization
Technical Field
The invention relates to a deep purification technology for coal-fired flue gas emissions in the industries of electric power, chemical industry, metallurgy, manufacturing and the like, in particular to a device for removing sulfur in coal-fired flue gas and used for desulfurization.
Background
The influence of the coal-fired flue gas emissions in the electric power, chemical, metallurgy and manufacturing industries on air pollution is great. Among them, the harmful substances such as smoke dust, sulfur dioxide, nitrogen oxides, etc. contained in the coal-fired flue gas are one of the sources of air pollution, acid rain and greenhouse effect. At present, large-scale flue gas desulfurization projects are developed in China, but the flue gas emission still cannot meet the current standard requirements, and further treatment is still needed.
The existing desulfurization technology often adopts the mode that a mechanical demister is additionally arranged at the top of a desulfurization tower, and has a certain removal effect on carried gypsum, but the mechanical demister generally has the phenomena of hardening and blocking during long-time operation, and cannot stably operate for a long time, so that gypsum slurry droplets enter the atmosphere along with the emission of flue gas. In addition, the more mature process of the wet desulphurization technology is a calcium method and an ammonia method, wherein the desulphurization efficiency of the calcium desulphurization technology cannot be improved without limit theoretically, the ammonia desulphurization efficiency can reach 100%, but the ammonia desulphurization has the problem of low operation efficiency.
CN 201404768Y discloses a desulfurizing tower for ammonia desulphurization, and the background technology of the desulfurizing tower carries out detailed analysis and comparison on calcium desulphurization and ammonia desulphurization technologies, wherein the advantages that the ammonia desulphurization can realize comprehensive utilization of sulfur resources, the full utilization of ammonia and the desulphurization efficiency are high, the consumption of a desulfurizing agent is small, no waste slag and waste water is generated, and the heat utilization efficiency is high compared with the calcium desulphurization. This prior art provides a simple structure's desulfurizing tower to utilize ammonia process desulfurization technique to realize the desulfurization purification of coal-fired flue gas.
However, the existing ammonia desulphurization device still has the defects that the contact efficiency of the flue gas and ammonia water or ammonia gas is low, and the desulphurization effect is affected by accumulation of crystals generated by reaction and dust in the flue gas. The spraying equipment arranged for avoiding regular shutdown and scale cleaning has low efficiency and large ammonia water consumption, and is difficult to maintain continuous and efficient operation of the desulfurization device.
Disclosure of Invention
The technical problem underlying the present invention is to provide a device for desulphurization in order to reduce or avoid the aforementioned problems.
In order to solve the technical problem, the invention provides a device for desulfurization, which is used for removing sulfur dioxide and smoke dust in coal-fired flue gas, wherein the device for desulfurization comprises a cylindrical shell which is transversely arranged; ammonia water is contained in the lower side of the interior of the shell, a driving shaft is arranged along the axis direction of the shell, a plurality of filtering turnplates are arranged on the driving shaft side by side, a spiral groove is formed in the rotating surface of each filtering turnplate, filtering screen cloth is arranged on at least one side surface of the spiral groove, and the outermost opening of the spiral groove can be immersed below the liquid level of the ammonia water; two annular baffles are arranged on two sides of each filtering rotary disc in parallel to the filtering rotary discs, extend towards the inside of the shell along the inner surface of the shell, and the lower ends of the annular baffles extend to be 5-10 cm below the liquid level of the ammonia water.
Preferably, the outermost opening of the spiral groove is oriented in the same direction as the rotation direction of the filter rotor.
Preferably, the cross-section of the helical groove is concave.
Preferably, the housing has a first end and a second end, the top of the first end is provided with a flue gas inlet, and the top of the second end is provided with a flue gas outlet.
Preferably, the bottom of the first end is provided with a discharge outlet, and the bottom of the second end is provided with a feed inlet.
Preferably, the liquid level of the ammonia water is located at the height position of 1/4-1/3 of the diameter of the shell.
The device for desulfurization greatly improves the contact area of flue gas and ammonia water by adopting the filtering turntable with the spiral groove structure, improves the dust removal efficiency, and can further avoid periodic shutdown for cleaning scale without additionally arranging a cleaning device, so that the device for desulfurization can continuously and efficiently operate, the ammonia water consumption is saved, and the cost is reduced.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein,
FIG. 1 is a schematic view showing the construction of an apparatus for desulfurization according to an embodiment of the present invention;
FIG. 2 shows a cross-sectional view A-A of the desulfurization unit shown in FIG. 1;
FIG. 3 is a schematic plan view of a filter carousel for a desulfurization unit according to one embodiment of the present invention;
fig. 4 shows a cross-sectional view B-B of the filter rotor disk of fig. 3.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings. Wherein like parts are given like reference numerals.
Fig. 1 is a schematic structural diagram of an apparatus for desulfurization according to an embodiment of the present invention, fig. 2 is a sectional view a-a of the apparatus for desulfurization shown in fig. 1, and the apparatus for desulfurization shown in fig. 1-2 can be used for desulfurization, dedusting and purification of coal-fired flue gas emissions in the industries of electricity, chemical industry, metallurgy, manufacturing, etc., and is particularly suitable for removing sulfur dioxide and smoke dust in coal-fired flue gas 100.
As shown in the drawings, the device for desulfurization includes a horizontally arranged cylindrical housing 1, ammonia water 2 is contained in the lower inner side of the housing 1, a driving shaft 3 is arranged along the axial direction of the housing 1, a plurality of filtering turntables 4 are arranged on the driving shaft 3 side by side, and fig. 1 shows that four filtering turntables 4 are arranged side by side, and the specific structure thereof is shown in fig. 3-4, which will be further described in detail later.
The housing 1 has a first end 11 and a second end 12, the top of the first end 11 is provided with a flue gas inlet 111, and the top of the second end 12 is provided with a flue gas outlet 121. Coal-fired flue gas 100 enters the shell 1 from the flue gas inlet 111, and is subjected to multiple filtering and purifying treatments by the filtering rotary disc 4, and the purified gas is finally discharged from the flue gas outlet 121.
The bottom of the first end 11 is provided with a discharge opening 112 and the bottom of the second end 12 is provided with a feed opening 122. The ammonia water 2 at the lower part of the shell 1 soaks the filter rotating disc 4 along with the rotation of the filter rotating disc 4, so that the ammonia water reacts with sulfur dioxide in the coal-fired flue gas 100, and the resultant dissolves or slides into the ammonia water 2, and is circularly supplemented through the feed inlet 122 and the discharge outlet 112, so that the ammonia water 2 in the shell 1 keeps available concentration, and meanwhile, the dissolved materials are discharged out of the shell 1. That is, when in use, ammonia water of a certain concentration can be continuously supplied through the feed opening 122, and the used ammonia water 2 in the housing 1 is extracted from the discharge opening 112 for filtration, and after reaction products in the ammonia water are removed, the remaining ammonia water can be fed into the housing 1 through the feed opening 122 for recycling.
In particular, in the present invention, the positions of the feed inlet 122 and the discharge outlet 112 for the ammonia water 2 to enter and exit are opposite to the positions of the flue gas inlet 111 and the flue gas outlet 121 of the coal-fired flue gas 100, because the content of sulfur dioxide and smoke dust at the position of the flue gas inlet 111 is the largest, and the reaction products gathered at the position of the flue gas inlet 111 are the largest, so the discharge outlet 112 arranged below the position of the flue gas inlet 111 can facilitate the discharge and removal of the reaction products in the shortest stroke, thereby reducing the usage amount of ammonia water, improving the efficiency and reducing the cost. If the positions of the feed inlet 122 and the discharge outlet 112 are exchanged, a large amount of reaction products need to flow through the whole length of the shell, the turbidity concentration of the ammonia water 2 is easily reduced, the removal efficiency of sulfur dioxide and smoke dust is reduced, the consumption of the ammonia water is increased, and the cost is correspondingly increased.
In one embodiment, the level of ammonia 2 is located at a height of 1/4-1/3 of the diameter of housing 1. That is, if the liquid level of the ammonia water 2 is too low, the amount of the ammonia water available for the reaction is too small to facilitate the removal of the pollutants, and too small amount of ammonia water may limit the transportation capability of the ammonia water to the reaction products and the soot, resulting in the accumulation of solid products in the housing, which is difficult to remove. On the other hand, if the liquid level of the ammonia water 2 is too high, the flow channel of the coal-fired flue gas is reduced, the dust removal efficiency is reduced, and meanwhile, the part of the filtering rotary disc 4 for dust removal, which is immersed in the ammonia water 2, is too much, so that the resistance is increased, the power and the energy consumption of a motor for driving the filtering rotary disc 4 are increased, and the cost optimization is not facilitated. The definition of the liquid level of the ammonia water 2 in the present embodiment is an optimized screening based on the structure of the apparatus for desulfurization of the present invention, and the numerical range closely related to the cylindrical structure of the housing 1, the housing diameter, the axial arrangement of the filter disks 4, and the arrangement of the drive shaft 3 is a comprehensive preferred range, which is not known in the art, is not easily imaginable by those skilled in the art, and is inventive in the meaning of patent law.
FIG. 3 is a schematic plan view of a filter carousel for a desulfurization unit according to one embodiment of the present invention; fig. 4 shows a cross-sectional view B-B of the filter rotor disk shown in fig. 3, as shown in fig. 3-4, the filter rotor disk 4 of the present embodiment has a disk-shaped structure as a whole, a spiral groove 41 is provided along a rotation surface of the filter rotor disk 4, a filter mesh cloth 42 is provided on at least one side surface of the spiral groove 41, and an outermost opening 411 of the spiral groove 41 may be submerged below the liquid level of the ammonia water 2.
Specifically, the filter rotating disk 4 of the present invention is formed by spirally winding an elongated corrosion-resistant material disk with a concave cross section (for example, made of glass fiber reinforced plastics or carbon fiber), so as to form a spiral groove 41, and preferably, a filter mesh cloth 42 (as shown in fig. 4) is disposed on a distal side of the spiral groove 41 along the flow direction of the flue gas 100, so as to facilitate the flue gas 100 to be integrally held by the filter rotating disk 4.
When the filter disc 4 is used for dust removal, the drive shaft 3 drives the filter disc 4 to rotate, the orientation of the outermost opening 411 of the spiral groove 41 is the same as the rotation direction of the filter disc 4, because the outermost opening 411 of the spiral groove 41 can be immersed below the liquid level of the ammonia water 2, when the outermost opening 411 of the spiral groove 41 is immersed into the ammonia water 2 and then turns out the ammonia water 2, a strand of ammonia water 2 will flow to the center of the filter disc 4 along the spiral groove 41, the ammonia water (with higher linear velocity) far away from the center of the filter disc 4 can be attached to the spiral groove 41 under the action of centrifugal force, but the ammonia water (with lower linear velocity) closer to the center of the filter disc 4 is smaller in centrifugal force, so that the ammonia water which rotates to the upper side will be poured from the center of the filter disc 4, and along with the rotation of the filter disc 4, the ammonia water continuously flows to, and flows down the center of the filter disks 4 to wet the filter cloth 42 throughout the filter disks 4. The structure of the invention greatly improves the contact area of the flue gas and the ammonia water and improves the dust removal efficiency.
The filter mesh cloth 42 completely soaked by the ammonia water 3 can continuously react with sulfur dioxide in the coal-fired flue gas 100, and meanwhile, the wet filter mesh cloth 42 can also remove smoke dust in the flue gas 100. Substances generated by the reaction are attached to the filter screen cloth 42 and are easily thrown out under the rotation of the filter turntable 4, and meanwhile, the ammonia water which is poured down can be washed into the ammonia water below and taken away, so that the influence of accumulation of the reaction products and dust on the filter screen cloth 42 on the desulfurization effect is avoided, and the regular shutdown and scale cleaning can be further avoided under the condition that a cleaning device is not additionally arranged, so that the device for desulfurization can continuously and efficiently operate, the ammonia water consumption is saved, and the cost is reduced.
In order to avoid the flue gas 100 from escaping from the gap between the filter disks 4 and the housing 1, in another embodiment, as shown in fig. 1-2, two annular baffles 5 are provided parallel to the filter disks 4 adjacent to both sides of each filter disk 4, preferably the annular baffles 5 project from the inner surface of the housing 1 to such a height as to completely block the gap between the filter disks 4 and the housing 1. Further preferably, the annular baffle 5 extends along the inner surface of the shell 1 to the inside of the shell 1, and the lower end of the annular baffle 5 extends to be 5-10 cm below the liquid level of the ammonia water 2. That is, in the above embodiment, the annular baffles 5 disposed at both sides are used to seal the gap between the filter turntable 4 and the housing 1, and meanwhile, since the ammonia water 2 below the housing 1 provides a water seal, the lower end of the annular baffle 5 does not need to extend to a large amount below the liquid surface, and only needs to extend to 5-10 cm below the liquid surface of the ammonia water 2, so that the material and cost can be saved. In particular, if the ring-shaped baffle 5 is of an entire ring-shaped structure, that is, if the ring-shaped baffle 5 extending to the bottom of the housing 1 is in a state of protruding from the inner surface, the ring-shaped structure protruding from the bottom of the housing 1 affects the fluidity of the ammonia water, and the solid matter is accumulated near the ring-shaped structure and is difficult to remove, and the protruding structure is also not favorable for the subsequent work of maintenance, cleaning, and the like, so the ring-shaped baffle 5 in the above embodiment of the present invention particularly preferably needs to extend to and stop 5 to 10 cm below the liquid surface.
In order to increase the strength of the filter disc 4, in a further embodiment, as shown in fig. 3, at least one side of the helical groove 41 is provided with a plurality of connection reinforcements 6 extending radially outward from the drive shaft 3, the connection reinforcements 6 not being shown in fig. 4 for clarity. Of course, it will be understood by those skilled in the art that the connection reinforcing members 6 may be disposed on both sides of the spiral groove 41 to improve the structural strength, and the disadvantages are that the flow resistance of the flue gas 100 may be increased, the dust removing efficiency may be reduced, the weight of the filter rotating disc 4 may be increased, and the energy consumption may be increased accordingly.
In a further embodiment, as shown in fig. 3-4, each connection reinforcement 6 is provided at an end position with a metal brush 61, the outermost end of the metal brush 61 being at an equal distance from the drive shaft 3. The metal brush 61 is provided to scrape off solid matter such as soot and the like adhered to the inner surface of the housing 1 and thrown off by the filter turntable 4, and to allow the solid matter to enter the ammonia water 2 to be cleaned. The structural strength of the end position of the reinforcing member 6 is high, so that the metal brush 61 is arranged on the filter turntable 4 without structural deformation. In addition, because the filter rotating disc 4 is of a spiral structure and the outer diameter thereof is unequal, the outermost ends of the metal brushes 61 need to be arranged at equal distances from the driving shaft 3, so that the outermost ends of the metal brushes 61 are at equal distances from the inner surface of the shell 1, and interference can not be generated, dead angles which cannot be reached by the metal brushes 61 can not exist, and cleaning of attachments is facilitated. The attachments cleaned from the inner surface of the housing 1 partially fall into the ammonia water directly, and partially adhere to the metal brush 61 and are washed away by the ammonia water as the metal brush 61 rotates in the ammonia water. In addition, the metal brush 61 is arranged to stir ammonia water, so that solid matters are prevented from being precipitated for a long time and being prevented from being brought away in a non-flowing manner.
It should be appreciated by those of skill in the art that while the present invention has been described in terms of several embodiments, not every embodiment includes only a single embodiment. The description is given for clearness of understanding only, and it is to be understood that all matters in the embodiments are to be interpreted as including technical equivalents which are related to the embodiments and which are combined with each other to illustrate the scope of the present invention.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent alterations, modifications and combinations can be made by those skilled in the art without departing from the spirit and principles of the invention.

Claims (4)

1. A device for desulfurization for removing sulfur dioxide and smoke from coal-fired flue gas (100), characterized in that said device for desulfurization comprises a laterally arranged cylindrical shell (1); the ammonia water purification device is characterized in that ammonia water (2) is contained in the lower side of the interior of the shell (1), a driving shaft (3) is arranged along the axis direction of the shell (1), a plurality of filtering turntables (4) are arranged on the driving shaft (3) side by side, a spiral groove (41) is arranged along the rotating surface of each filtering turntable (4), filter screen cloth (42) is arranged on at least one side surface of each spiral groove (41), and an outermost opening (411) of each spiral groove (41) is immersed below the liquid level of the ammonia water (2); two annular baffles (5) are arranged on two sides of each filtering rotary disc (4) in parallel to the filtering rotary discs (4), the annular baffles (5) extend towards the inside of the shell (1) along the inner surface of the shell (1), the lower ends of the annular baffles (5) extend to be 5-10 cm below the liquid level of the ammonia water (2), the direction of the outermost side opening (411) of each spiral groove (41) is the same as the rotating direction of the filtering rotary discs (4), the cross section of each spiral groove (41) is concave, and each spiral groove (41) is made by winding a long-strip-shaped corrosion-resistant material disc with the concave cross section into a spiral shape.
2. The device for desulfurization according to claim 1, wherein said housing (1) has a first end (11) and a second end (12), said first end (11) being provided at the top with a flue gas inlet (111) and said second end (12) being provided at the top with a flue gas outlet (121).
3. The apparatus for desulfurization according to claim 2, wherein the bottom of said first end (11) is provided with a discharge opening (112) and the bottom of said second end (12) is provided with a feed opening (122).
4. The device for desulfurization according to one of claims 1 to 2, characterized in that the surface of the aqueous ammonia (2) is located at a height of 1/4 to 1/3 of the diameter of the casing (1).
CN201510505988.1A 2015-08-18 2015-08-18 A kind of device for desulfurization Active CN105056737B (en)

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CN105056737B true CN105056737B (en) 2017-11-21

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CN105498432A (en) * 2016-02-02 2016-04-20 徐彬 Dusty gas dedusting method and device

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CN2423944Y (en) * 2000-04-21 2001-03-21 梁成芬 Horizontal water film dust removing desulurizer
CN1613543A (en) * 2004-09-20 2005-05-11 安仲伟 Smoke processor
CN204460386U (en) * 2015-02-04 2015-07-08 李文革 Can the air exhausting device of purifying oil fume

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Effective date of registration: 20170928

Address after: 551201 Guizhou Longli County, Qiannan Buyei and Miao Autonomous Prefecture, hi tech Industrial Park

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Denomination of invention: A device for desulfurization

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