CN113171681A - Semi-dry FGD flue gas system based on double absorption towers - Google Patents
Semi-dry FGD flue gas system based on double absorption towers Download PDFInfo
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- CN113171681A CN113171681A CN202110447737.8A CN202110447737A CN113171681A CN 113171681 A CN113171681 A CN 113171681A CN 202110447737 A CN202110447737 A CN 202110447737A CN 113171681 A CN113171681 A CN 113171681A
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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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention discloses a semidry FGD flue gas system based on double absorption towers, which comprises: a system base, a first movable flapper door, a second movable flapper door, and a pressure limiting assembly. Wherein, the system base has the flue gas and detains the chamber, has seted up flue gas inlet, first exhanst gas outlet, second exhanst gas outlet and bypass outlet on the flue gas is detained the chamber, and the flue gas is detained the chamber and is included pressure chamber, first supplementary vice chamber and the supplementary vice chamber of second. The first auxiliary cavity is provided with a sliding guide groove, and the sliding guide groove comprises a deflection guide groove and a lifting guide groove; the first movable flapper door has a flapper door body and a slide guide disposed on the flapper door body. The pressure limiting assembly comprises a separation frame and a pressure limiting fixture block, the separation frame is arranged in the pressure cavity, the pressure limiting fixture block is installed on the separation frame through a telescopic elastic piece, and a fixture block groove matched with the pressure limiting fixture block is formed in the baffle door body. When the system fails, the invention can effectively perform switching and can simultaneously plug the double absorption towers.
Description
Technical Field
The invention relates to the technical field of semi-dry desulphurization, in particular to a semi-dry FGD flue gas system based on double absorption towers.
Background
The desulfurization flue gas system is an extension part of a boiler air-flue gas system and mainly comprises a flue gas inlet baffle door (a raw flue gas baffle door), an outlet baffle door (a clean flue gas baffle door), a bypass baffle door, a booster fan, an absorption tower, a GGH (gas-gas heat exchanger), a flue and corresponding auxiliary systems.
The flue gas led out from the back flue of the boiler induced draft fan is boosted by a booster fan, and enters an absorption tower after being cooled by a flue gas heat exchanger (GGH), and is in countercurrent contact with vaporific limestone slurry in the absorption tower, so that the flue gas is desulfurized and purified, water mist is removed by a demister, the temperature is raised to be more than 75 ℃ by the GGH, and the flue gas enters a clean flue and is discharged by a chimney.
In the design and manufacture process of the FGD flue gas system, the technical requirements are as follows: the bypass damper needs to have a quick-open function, the quick-open time being less than 10S, the damper adjustment time being 75S in the normal case and about 3 to 10S in the event of an accident.
Further, in order to improve the exhaust gas treatment capacity, a plant side usually considers a structure of configuring a "double absorption tower" in the whole exhaust gas treatment system.
Therefore, how to design and develop a FGD flue gas system based on "double absorption towers", when the FGD plant breaks down and stops operating, the bypass damper door can be opened and closed effectively in time, and can block the flue gas inlets of two absorption towers at the same time, which is a technical problem that needs to be solved by technicians.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a semidry FGD flue gas system based on double absorption towers, when an FGD device breaks down and stops running, a bypass baffle door can be opened and closed effectively in time, and the flue gas inlets of the two absorption towers can be blocked simultaneously.
The purpose of the invention is realized by the following technical scheme:
a semi-dry FGD flue gas system based on double absorption towers comprises: the system comprises a system base, a first movable baffle door, a second movable baffle door and a pressure limiting assembly;
the system base is provided with a smoke detention cavity, the smoke detention cavity is provided with a smoke inlet, a first smoke outlet, a second smoke outlet and a bypass outlet, the smoke detention cavity comprises a pressure cavity, a first auxiliary cavity and a second auxiliary cavity, the first movable baffle door is installed in the first auxiliary cavity, the second movable baffle door is installed in the second auxiliary cavity, and the first movable baffle door and the second movable baffle door are matched to block or open the bypass outlet;
the structure of the first auxiliary chamber is the same as that of the second auxiliary chamber, and the structure of the first movable baffle door is the same as that of the second movable baffle door;
the first auxiliary cavity is provided with a sliding guide groove, and the sliding guide groove comprises a deflection guide groove and a lifting guide groove;
the first movable baffle door is provided with a baffle door body and a sliding guide part arranged on the baffle door body; the sliding guide part is provided with a deflection roller and a lifting roller, the deflection roller is accommodated in the deflection guide groove, and the lifting roller is accommodated in the lifting guide groove;
the pressure limiting assembly comprises a separation frame and a pressure limiting fixture block, the separation frame is arranged in the pressure cavity, the pressure limiting fixture block is installed on the separation frame through a telescopic elastic piece, and a fixture block groove matched with the pressure limiting fixture block is formed in the baffle door body.
In one embodiment, the separating frame is provided with a stop block.
In one embodiment, the diameter of the deflection roller is larger than that of the lifting roller, and the diameter of the deflection roller is larger than the groove diameter of the lifting guide groove.
In one embodiment, the elastic member is a spring structure.
In one embodiment, the sliding guide portions are provided on both sides of the first movable flapper door, and the sliding guide portions on both sides correspond to the sliding guide grooves on both sides of the cavity wall of the first auxiliary sub-cavity, respectively.
In one embodiment, rubber sealing rings are arranged around the first movable baffle door and the second movable baffle door.
In one embodiment, the system base is provided with a connecting end at the first flue gas outlet and the second flue gas outlet, and the connecting end is provided with connecting threads.
In summary, when the system of the semi-dry FGD flue gas system based on the double absorption towers fails, the first movable baffle door and the second movable baffle door can be effectively opened and closed for switching, and the two absorption towers can be plugged simultaneously.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural diagram of a semi-dry FGD flue gas system based on double absorption towers;
FIG. 2 is a partial cutaway view of a dual absorber based semi-dry FGD flue gas system of FIG. 1;
FIG. 3 is a front view of a semi-dry FGD flue gas system based on dual absorption towers shown in FIG. 2;
FIG. 4 is a schematic view of the construction of the first movable flapper door shown in FIG. 2;
FIG. 5 is an enlarged view taken at A in FIG. 3;
FIG. 6 is a state diagram of the first movable flapper door during a change-over plugging process (one);
fig. 7 is a state diagram (two) of the first movable flapper door during a change-over plugging process.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1 and fig. 2, the invention discloses a semi-dry FGD flue gas system 10 based on double absorption towers, which comprises: system base 100, first movable flapper door 200, second movable flapper door 300, and pressure limiting assembly 400.
As shown in fig. 2 and 3, the system base 100 has a smoke retention chamber 110, the smoke retention chamber is provided with a smoke inlet 500, a first smoke outlet 600, a second smoke outlet 700 and a bypass outlet 800, the smoke retention chamber 110 includes a pressure chamber 120, a first auxiliary chamber 130 and a second auxiliary chamber 140, the first movable baffle door 200 is installed in the first auxiliary chamber 130, the second movable baffle 300 is installed in the second auxiliary chamber 140, and the first movable baffle door 200 and the second movable baffle door 300 cooperate to close or open the bypass outlet 800.
When the system is operated, the flue gas inlet 500 is connected with a boiler air-flue system, the first flue gas outlet 600 is connected with one of the absorption towers, the second flue gas outlet 700 is connected with the other absorption tower, and the bypass outlet 800 is connected with a chimney flue. In the normal operation process, the first movable baffle door 200 and the second movable baffle door 300 block the bypass outlet 800, the first smoke outlet 600 and the second smoke outlet 700 are in the open state, smoke introduced from the boiler air-smoke system enters the smoke retention chamber 110 through the smoke inlet 500 and then is discharged to the absorption tower through the first smoke outlet 600 and the second smoke outlet 700.
It is noted that the structure of first auxiliary sub-chamber 130 is the same as that of second auxiliary sub-chamber 140, and the structure of first movable flapper door 200 is the same as that of second movable flapper door 300. To avoid repetition of redundant description, the first auxiliary sub-chamber 130 and the first movable flapper door 200 will be exemplified below in detail, and the structure and operation principle of the second auxiliary sub-chamber 140 and the second movable flapper door 300 may be referred to the first auxiliary sub-chamber 130 and the first movable flapper door 200, respectively.
Specifically, as shown in fig. 3, the first auxiliary sub-chamber 130 is provided with a sliding guide slot 150, and the sliding guide slot 150 includes a yaw guide slot 151 and a lift guide slot 152.
As shown in fig. 3 and 4, first movable flapper door 200 has a flapper door body 210 and a slide guide 220 provided on flapper door body 210. The sliding guide 220 is provided with a yawing roller 221 and a lifting roller 222, the yawing roller 221 is accommodated in the yawing guide groove 151, and the lifting roller 222 is accommodated in the lifting guide groove 152.
As shown in fig. 4 and 5, the pressure limiting assembly 400 includes a separating frame 410 and a pressure limiting latch 420, the separating frame 410 is disposed in the pressure chamber 120, the pressure limiting latch 420 is mounted on the separating frame 410 through a telescopic elastic member 421, and the flapper door body 210 is provided with a latch groove 211 engaged with the pressure limiting latch 420. Preferably, the elastic member 421 is a spring structure.
In one embodiment, as shown in FIG. 5, a blocking piece 411 is provided on the partition frame 410, and the blocking piece 411 is used to assist in supporting the first movable flapper door 200 and the second movable flapper door 300.
When the system is in normal operation, the pressure limiting fixture 420 is held in the fixture groove 211 of the flapper door body 210, and the flapper door body 210 and the spacer 410 cooperate to block the pressure chamber 120, so that the flue gas cannot be discharged from the bypass outlet 800 and can only be discharged to the two absorption towers through the first flue gas outlet 600 and the second flue gas outlet 700. When the system fails, the absorber tower no longer processes the flue gas, and the flue gas begins to accumulate in the pressure chamber 140 and causes a sharp increase in gas pressure. When the air pressure in the pressure chamber 140 reaches a certain value, the flapper door body 210 is pushed by the air pressure to be separated from the clamping of the pressure-limiting clamping block 420, thereby opening the bypass outlet 800; and the flapper door body 210 completes the action of changing the plugging object along the sliding guide slot 150 under the pushing of the high-pressure gas, and finally plugs the first flue gas outlet 600 and the second flue gas outlet 700, so that the flue gas can not enter the absorption tower any more. Thus, the baffle door body 210 is effectively controlled when the system fails, so that the equipment in the absorption tower and the boiler air and smoke system can not be damaged due to high pressure generated by the failure, and the possibility of safety accidents is reduced. The specific operating principle of first movable flapper door 200 will be explained below.
In the present embodiment, as shown in fig. 4, the first movable flapper door 200 is provided at both sides thereof with slide guide portions 220, and the slide guide portions 220 at both sides correspond to the slide guide grooves 150 at both sides of the cavity wall of the first auxiliary sub-cavity 130, respectively. In this way, stable sliding of the slide guide part 220 within the slide guide groove 150 can be achieved.
In particular, in order to smoothly perform the operation of changing the closing position of the first flapper door 200, the slide guide 220 must be slid exactly along the path designed in the slide guide groove 150, and thus it is necessary to ensure that the yaw roller 221 is always held in the yaw guide groove 151 and the lift roller 222 is always held in the lift guide groove 152 during the sliding. However, as shown in fig. 3, since the trajectory of the deflection guide groove 151 is meandering and intersects with the lift roller 222 as required for changing the plugging operation, in order to prevent the deflection roller 221 from being separated from the deflection guide groove 151 when passing through the intersection, a designer particularly adjusts the diameter of the deflection roller 221 so that the diameter of the deflection roller 221 is larger than the diameter of the lift roller 222 and the diameter of the deflection roller 221 is larger than the groove diameter of the lift guide groove 152. Thus, when the yaw roller 221 passes through the intersection of the yaw guide groove 151 and the lift guide groove 152, the yaw roller 221 cannot be "caught" in the lift guide groove 152, thereby ensuring that the yaw roller 221 does not come off the yaw guide groove 151.
The specific operating principle of first movable flapper door 200 is explained below:
firstly, when the system fails, the first movable baffle door 200 is changed and blocks the first smoke outlet 600; the second movable flapper door 300 shifts and in turn blocks the second flue gas outlet 700. The operating principle of second movable flapper door 300 is identical to that of first movable flapper door 200, and therefore, only first movable flapper door 200 and its related components will be described in detail below, with reference to first movable flapper door 200 for the operating principle of second movable flapper door 300 and its related components;
to better illustrate the process and operation of the first flapper door 200 for changing the plugging, the movement of the first flapper door 200 for changing the plugging is divided into three steps, respectively: tilted, flipped, and dropped, and represented by the numeral designations 1 through 3;
when the system normally operates, the first movable baffle door 200 is at the position shown in fig. 2 and 3, the pressure limiting fixture block 420 is clamped in the fixture block groove 211 of the baffle door body 210, the baffle door body 210 and the separating frame 410 are matched to block the pressure chamber 120, so that the smoke gas flowing in from the smoke gas inlet 500 cannot be discharged from the bypass outlet 800, and only can pass through the pressure chamber 120, the first auxiliary cavity 130 and the first smoke gas outlet 600 in sequence and finally be discharged to the absorption tower;
when the system breaks down, the absorption tower can not handle the flue gas, and the flue gas can not be discharged through first exhanst gas outlet 600. In this case, the air pressure in the pressure chamber 120 and the first auxiliary chamber 130 starts to increase sharply. When the pressure in the pressure chamber 140 reaches a certain value, the flapper door body 210 will overcome the pressing force of the pressure-limiting latch 420 and will be released from the latching of the pressure-limiting latch 420 under the pushing of the gas pressure. Since the sliding guide portion 220 is accommodated in the sliding guide groove 150, the first movable flapper door 200 is tilted around the lifting roller 222 after being separated from the pressure-limiting fixture block 420, i.e., is pushed by the high-pressure smoke to tilt, as shown by the numeral 1 in fig. 6 and 7. Subsequently, the first movable flapper door 200 is swung in the direction of the arrow by the high pressure flue gas, and at the same time, the swing roller 221 slides along the inclined surface of the swing guide groove 151, and the first movable flapper door 200 performs a turning action by the cooperation of the inclined surface of the swing guide groove 151 and the thrust of the flue gas, as shown by reference numeral 2 in fig. 6 and 7. After the turning is completed, the flapper door body 210 no longer blocks the bypass outlet 800, and the flue gas can be discharged out of the flue gas retention chamber 110 through the bypass outlet 800. Under the gravity, the swing roller 221 descends along the swing guide groove 151, the lift roller 222 descends along the lift guide groove 152, and the first movable flapper door 200, which is turned upside down, falls to the bottom of the system base 100, as shown by reference numeral 3 in fig. 6 and 7. At this time, the flapper door body 210 of the first movable flapper door 200 and the cavity wall of the first auxiliary sub-cavity 130 cooperate to form a closed space, and further the first smoke outlet 600 is blocked, so that smoke cannot enter the absorption tower through the first smoke outlet 600, thereby ensuring that equipment in the absorption tower cannot be damaged due to high pressure generated by a fault, and reducing the possibility of safety accidents.
When the fault is cleared and the system is reset again, the worker can adjust the first movable baffle door 200 and the second movable baffle door 300 back to the original state when the system normally operates by only disassembling the system base 100 and then reversely operating the first movable baffle door 200 and the second movable baffle door 300 according to the sequence of the change actions, so that the reset is realized. Therefore, the semi-dry FGD flue gas system 10 based on the double absorption towers can be reset through simple manual operation, and multiple recycling is realized.
It is noted that, during normal operation of the system, first movable flapper door 200 cooperates with spacer frame 410 to block bypass outlet 800, and pressure limiting latch 420 is retained in latch groove 211. When the system fails, the pressure in the pressure chamber 120 needs to overcome both the gravity of the first movable flapper door 200 and the holding force provided by the pressure-limiting latch 420, and in this case, the pressure in the pressure chamber 120 can release the first movable flapper door 200 from the holding of the pressure-limiting latch 420 and tilt up only when the pressure reaches a certain pressure value. And once the first movable flapper door 200 is tilted, the high-pressure flue gas rushing toward the bypass outlet 800 will provide enough thrust for the flipping of the first movable flapper door 200, so that the flipping operation can be smoothly completed. Finally, the first movable flapper door 200 falls under the action of gravity, completing the plugging of the first flue gas outlet 600.
In one embodiment, rubber packing (not shown) is provided around the first and second movable flapper doors 200 and 300. In this manner, the sealing effect of first and second movable flapper doors 200 and 300 at the time of plugging can be improved.
In one embodiment, as shown in fig. 2, the system base 100 is provided with a connecting end 610 at each of the first flue gas outlet 600 and the second flue gas outlet 700, and the connecting end 610 is provided with a connecting thread 620, so that the semi-dry FGD flue gas system 10 based on the dual absorption towers can be conveniently connected with the pipeline provided by the absorption towers.
In summary, when the system of the semi-dry FGD flue gas system 10 based on dual absorption towers is in failure, the first movable baffle door 200 and the second movable baffle door 300 can be effectively switched to open and close, and the two absorption towers can be plugged at the same time.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A semi-dry FGD flue gas system based on double absorption towers is characterized by comprising: the system comprises a system base, a first movable baffle door, a second movable baffle door and a pressure limiting assembly;
the system base is provided with a smoke detention cavity, the smoke detention cavity is provided with a smoke inlet, a first smoke outlet, a second smoke outlet and a bypass outlet, the smoke detention cavity comprises a pressure cavity, a first auxiliary cavity and a second auxiliary cavity, the first movable baffle door is installed in the first auxiliary cavity, the second movable baffle door is installed in the second auxiliary cavity, and the first movable baffle door and the second movable baffle door are matched to block or open the bypass outlet;
the structure of the first auxiliary cavity is the same as that of the second auxiliary cavity, and the structure of the first flapper door is the same as that of the second movable flapper door;
the first auxiliary cavity is provided with a sliding guide groove, and the sliding guide groove comprises a deflection guide groove and a lifting guide groove;
the first movable baffle door is provided with a baffle door body and a sliding guide part arranged on the baffle door body; the sliding guide part is provided with a deflection roller and a lifting roller, the deflection roller is accommodated in the deflection guide groove, and the lifting roller is accommodated in the lifting guide groove;
the pressure limiting assembly comprises a separation frame and a pressure limiting fixture block, the separation frame is arranged in the pressure cavity, the pressure limiting fixture block is installed on the separation frame through a telescopic elastic piece, and a fixture block groove matched with the pressure limiting fixture block is formed in the baffle door body.
2. The dual absorber based semi-dry FGD flue gas system according to claim 1, wherein the spacer is provided with a blocking block.
3. The dual absorber based semi-dry FGD flue gas system according to claim 1, wherein the diameter of the yaw rollers is larger than the diameter of the lifting rollers, and the diameter of the yaw rollers is larger than the groove diameter of the lifting guide grooves.
4. The dual absorber based semi-dry FGD flue gas system according to claim 1, wherein the elastic members are spring structures.
5. The dual absorption tower-based semidry FGD flue gas system according to claim 1, wherein the sliding guides are provided at both sides of the first movable flapper door, and respectively correspond to the sliding guide grooves at both sides of the cavity wall of the first auxiliary sub-cavity.
6. The dual absorber based semi-dry FGD flue gas system according to claim 5, wherein the first movable baffle door and the second movable baffle door are provided with rubber sealing rings around them.
7. The dual absorber based semi-dry FGD flue gas system as claimed in claim 1, wherein the system base has a connection end at the first flue gas outlet and the second flue gas outlet, and the connection end has a connection thread.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110447737.8A CN113171681B (en) | 2021-04-25 | 2021-04-25 | Semi-dry FGD flue gas system based on double absorption towers |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110447737.8A CN113171681B (en) | 2021-04-25 | 2021-04-25 | Semi-dry FGD flue gas system based on double absorption towers |
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| CN113171681A true CN113171681A (en) | 2021-07-27 |
| CN113171681B CN113171681B (en) | 2022-03-18 |
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| CN111847868A (en) * | 2020-08-24 | 2020-10-30 | 四川和泰光纤有限公司 | Intermediate frequency furnace emergency cooling processing device and method based on power-off state |
| CN112007499A (en) * | 2020-09-07 | 2020-12-01 | 浙江兰电环保集团有限公司 | Bypass jerkiness formula pressure relief mechanism and SOx/NOx control dust collecting equipment thereof |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59142325A (en) * | 1983-02-03 | 1984-08-15 | Ishikawajima Harima Heavy Ind Co Ltd | Feed air control device in flue gas control facility |
| DE4324183A1 (en) * | 1993-07-19 | 1995-01-26 | Siemens Ag | Bypass chimney (stack), in particular for a gas and steam turbine plant |
| CN201106859Y (en) * | 2007-09-11 | 2008-08-27 | 中国神华能源股份有限公司 | Adjustable rapid-opening unification type smoke damper door |
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| CN104728469A (en) * | 2015-03-28 | 2015-06-24 | 中国船舶重工集团公司第七�三研究所 | Waste heat boiler three-way baffle valve |
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| CN111847868A (en) * | 2020-08-24 | 2020-10-30 | 四川和泰光纤有限公司 | Intermediate frequency furnace emergency cooling processing device and method based on power-off state |
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| CN113171681B (en) | 2022-03-18 |
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Denomination of invention: Semi dry FGD flue gas system based on double absorption tower Effective date of registration: 20220711 Granted publication date: 20220318 Pledgee: Agricultural Bank of China Limited Zhuji sub branch Pledgor: ZHEJIANG LANDIAN ENVIRONMENTAL PROTECTION GROUP Co.,Ltd. Registration number: Y2022980010086 |
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