CN104534485B - A kind of method that nitrous oxides concentration is reduced during slurry factory foul smell incinerator treatment liquid methanol - Google Patents
A kind of method that nitrous oxides concentration is reduced during slurry factory foul smell incinerator treatment liquid methanol Download PDFInfo
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- CN104534485B CN104534485B CN201410759014.1A CN201410759014A CN104534485B CN 104534485 B CN104534485 B CN 104534485B CN 201410759014 A CN201410759014 A CN 201410759014A CN 104534485 B CN104534485 B CN 104534485B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/04—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste liquors, e.g. sulfite liquors
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Abstract
The invention provides a kind of method that discharged nitrous oxides concentration is reduced during slurry factory foul smell incinerator treatment liquid methanol, comprise the following steps：Liquid methanol and air are burnt；The air feed pattern of the air is three-level air feed.Method provided by the invention is a kind of processing method of liquid methanol, test result indicates that：This method is handled in the product obtained during slurry factory liquid methanol, and nitrous oxides concentration meets the discharge standard of national regulation, less than 240mg/Nm3.Further, first order air feed flow is 2.5m in three-level air feed3/ s~3.0m3/ s, the wind supply quantity of first order air feed account for the 30%~40% of three-level air feed total blast volume；Furnace temperature is adjusted to 800 DEG C~830 DEG C, suppresses the combination of nitrogen and oxygen, reduces the discharge capacity of nitrogen oxides.Safety, will not explode, reveal and cause accident in processing method implementation process provided by the invention；This method facilitates easy to operate.
Description
Technical field
The invention belongs to the technical field of caused liquid methanol in sulfate production process, more particularly to one kind
The method that nitrous oxides concentration is reduced during slurry factory foul smell incinerator treatment liquid methanol.
Background technology
《Paper and papermaking》In 1 month 2004,《Gram vara stench processing system and its operating experience》One text describes foul smell
Main harm be exactly that it contains fixed gas (NCG), and the main component of fixed gas is total reduced sulfur (TRS), methanol
And turpentine oil, it from boiling vessel, evaporator, turpentine oil system, stripper, do not float in pulp wash machine, black liquor slot and sump
Come out；The main component of total reduced sulfur is hydrogen sulfide (H2S), methyl mercaptan (CH3SH), dimethyl sulphide (CH3SCH3)
With dimethyl disulfide (CH3SSCH3).Fixed gas is generally divided into dense foul smell (CNCG), dilute foul smell (DNCG) and stripping foul smell
(SOG), the composition of three kinds of foul smell is similar, and simply concentration is different.Wherein, stripping foul smell is also stripping separation gas, stripping point
Come from alkali collection evaporation section from gas (SOG).
Stripping separation gas (SOG) after SOG condensers, produces the liquid of about 35% mass concentration from dirty lime set stripping system
Body methanol, these liquid turn into SOL stripping separating liquids, methanol distillation workshop are sent to through electrodynamic pump, from distillation workshop evaporation section
At least liquid methanol of the mass concentration of product 80%.Obtained liquid methanol includes methanol, water, sulfur-containing compound and nitrogenous chemical combination
Thing, it is a kind of good fuel, nitrogen oxides can be produced after burning.
In the product obtained in the prior art after treatment liquid methanol, nitrous oxides concentration is 350 mg/Nm3~450mg/
Nm3, do not meet the discharge standard of the nitrous oxides concentration of national regulation.
The content of the invention
In view of this, it is an object of the invention to provide nitrogen oxygen is reduced during a kind of slurry factory foul smell incinerator treatment liquid methanol
The method of compound concentration, method provided by the invention can reduce nitrous oxides concentration, meet discharging standards.
The invention provides the side that discharged nitrous oxides concentration is reduced during a kind of slurry factory foul smell incinerator treatment liquid methanol
Method, comprise the following steps：
Liquid methanol and air are burnt；
The air feed pattern of the air is three-level air feed.
Preferably, the flow of the liquid methanol is 0.4L/s~0.6L/s.
Preferably, the flow of first order air feed is 2.5m in the three-level air feed3/ s~3.0m3/s。
Preferably, the wind supply quantity of the first order air feed accounts for the 30%~40% of the total wind supply quantity of three-level air feed.
Preferably, the burning is carried out in incinerator；The furnace temperature of the incinerator by into incinerator blowing air enter
Row regulation and control.
Preferably, the flow of third level air feed is 4m in the three-level air feed3/ s~6.0m3/s。
Preferably, the temperature of the burning is 800 DEG C~830 DEG C.
Preferably, the liquid methanol includes methanol, water, sulfur-containing compound and nitrogen-containing compound.
The invention provides a kind of method that nitrous oxides concentration is reduced during slurry factory foul smell incinerator treatment liquid methanol, bag
Include following steps：Liquid methanol and air are burnt；The air feed pattern of the air is three-level air feed.It is provided by the invention
Method is a kind of processing method of liquid methanol, test result indicates that：In the product that this method treatment liquid methanol obtains, nitrogen
Oxide concentration meets the discharge standard of national regulation, less than 240mg/Nm3。
Further, for the present invention by the way that furnace temperature is adjusted into 800 DEG C~830 DEG C, furnace temperature temperature is relatively low, suppresses the knot of nitrogen and oxygen
Close, reduce the discharge capacity of nitrogen oxides.
Brief description of the drawings
Fig. 1 is the structural representation for the slurry factory foul smell incinerator that the embodiment of the present invention uses.
Embodiment
The invention provides a kind of method that nitrous oxides concentration is reduced during slurry factory foul smell incinerator treatment liquid methanol, bag
Include following steps：
Liquid methanol and air are burnt；
The air feed pattern of the air is three-level air feed.
The present invention is burnt liquid methanol and air in slurry factory foul smell incinerator.In the present invention, the slurry factory
The equipment item number of foul smell incinerator is 492E402/492E412, and manufacturer is A.H. Lundberg System Limited.
In the present invention, the structural representation of the slurry factory foul smell incinerator is as shown in figure 1, Fig. 1 is the slurry that the embodiment of the present invention uses
The structural representation of factory's foul smell incinerator：
In Fig. 1, A is a wind pipe, and B is Impbin NCG pipelines, and C is DNCG pipelines, and D is primary air fan, E mono-
Body formula burner, F are incinerator burner hearth；
1st, 3 be DNCG/ air communication valves, and 2 be DNCG flow control valves, and 4 be Impbin NCG/ air communication valves, 5,6
It is an air flow control valve with 7.
Slurry factory foul smell incinerator provided by the invention include a wind pipe A, the Impbin NCG pipelines B that be arranged in parallel and
DNCG pipelines C；The a wind pipe A is the pipeline used in first order air feed in three-level air feed；The Impbin NCG pipelines B
For the pipeline used in second level air feed in three-level air feed；The DNCG pipelines C is the pipe used in third level air feed in three-level air feed
Road.
In the present invention, the primary air fan D is arranged on a wind pipe A；The output end of the primary air fan D is led to
The input that a wind pipe is crossed with First air three-level air feed regulating valve is connected；The output of the First air three-level air feed regulating valve
End is connected with integral combustor；
Impbin NCG/ air communications valve 4 is provided among the Impbin NCG pipelines B and a wind pipe A；It is described
Impbin NCG pipelines B are connected with incinerator burner hearth F top；
DNCG flow control valves 2 are provided with the DNCG pipelines C, the output end of the DNCG regulating valves is managed by DNCG
Road is connected with burner hearth F middle part；DNCG/ air communications valve 1 is provided among the DNCG pipelines C and a wind pipe A,
The DNCG/ air communications 1 control the gas of DNCG pipelines to be passed through into a wind pipe A；The a wind pipe A with
DNCG/ air communications valve 3 is provided among DNCG pipelines C；
The integral combustor E is connected with burner hearth F.
The slurry factory foul smell incinerator that the present invention uses can automatically control, and can also manually control.
The present invention first starts slurry factory foul smell and burns furnace igniting and diesel combustion system before start liquid methanol combustion system
System.Startup no special limitation of the present invention to the slurry factory foul smell incinerator, using slurry well known to those skilled in the art
The start-up technique scheme of factory's foul smell incinerator.In the present invention, the startup of the slurry factory foul smell incinerator is burnt including integral type
Device is lighted a fire and the burning of diesel oil.
Present invention preferably employs liquefied petroleum gas to be lighted a fire.The present invention does not have special limit to the source of the liquefied gas
System, using liquefied petroleum gas well known to those skilled in the art, can such as use its commercial goods.In the present invention, institute
State liquefied gas and preferably include propane, butane, propylene and butylene；The content of the propane is preferably 16%~20%；The butane
Content be preferably 42%~46%；The content of the propylene is preferably 6%~11%；The content of the butylene is preferably 5%
~6%.In the present invention, the liquefied petroleum gas is igniter gas, is only used in incinerator starting ignition, once light a fire successfully
Afterwards, diesel oil will be started to rob.
The present invention does not have special limitation to the source of the diesel oil, is using diesel oil well known to those skilled in the art
Can, it can such as use its commercial goods.In the present invention, the Diesel oil storage is in diesel-oil gun.The present invention is in order to remain stable
Burning, the minimum flow of diesel oil is preferably 0.1L/s.
In the present invention, the liquid methanol is a kind of liquid fuel containing methanol, and the liquid methanol includes methanol
(CH3OH), water, sulfur-containing compound and nitrogen-containing compound；In certain embodiments of the present invention, the mass content of the methanol is
80%~85%, the mass content of the water is 15%~20%；
In the present invention, the sulfur-containing compound includes dimethyl disulfide, 1- (methyl mercapto) ethyl mercaptan, (methyl mercapto) third
Mercaptan, 4- sulfydryls -4-methyl-2 pentanone, double (methyl mercapto) ethane and long-chain sulphur；The mass content of the dimethyl disulfide is excellent
Elect 940mg/L~960mg/L, more preferably 945mg/L~955mg/L as；The mass content of 1- (methyl mercapto) ethyl mercaptan
Preferably 1650mg/L~1750mg/L, more preferably 1680mg/L~1720mg/L；The quality of (methyl mercapto) propanethiol
Content is preferably 1050 mg/L~1140mg/L, more preferably 1080mg/L~1120mg/L；4- sulfydryls -4- methyl-the 2-
The mass content of pentanone is preferably 65mg/L~75mg/L, more preferably 68mg/L~72mg/L；Described double (methyl mercapto) ethane
Mass content be preferably 160mg/L~180mg/L, the mg/L of more preferably 165mg/L~175；The quality of the long-chain sulphur contains
Amount is preferably 3100mg/L~3300mg/L, more preferably 3150 mg/L~3250mg/L；
In the present invention, the content of total nitrogen is preferably the mg/L of 11700mg/L~11900 in the nitrogen-containing compound, more excellent
Elect 11750mg/L~11850mg/L as；The content of ammonia nitrogen is preferably 10000mg/L~10100mg/ in the nitrogen-containing compound
L, more preferably 10020mg/L~10080mg/L；The nitrogen-containing compound preferably includes pyrroles and fatty amine；The pyrroles's
Mass content is preferably 15mg/L~25mg/L, more preferably 18mg/L~22mg/L；The mass content of the fatty amine is preferred
For 140mg/L~160 mg/L, more preferably 145mg/L~155mg/L.In the present invention, after the diesel combustion is normal, point
Burning liquid methanol, after normal operation, stop the burning of diesel oil；When liquid methanol amount deficiency or the liquid methanol system failure
When, launch diesel burning systems.In the present invention, the flow of the liquid methanol is preferably 0.4L/s~0.6L/s, more preferably
For 0.47L/s~0.52L/s, most preferably 0.5L/s.
In the present invention, the air is the fresh air of supplement, and the air feed pattern of the air is three-level air feed, i.e., logical
Cross after primary air fan supercharging by three-level air supply line to incinerator burner hearth；In a particular embodiment of the present invention, three-level air feed
Incinerator burner hearth is entered to by a wind pipe, Impbin NCG pipelines and DNCG pipelines respectively for supplement air；Described one
Secondary wind passes through Impbin NCG/ air communication valves by 5,6 and 7 three First air Flux Valve Control first order wind supply quantities
Second level wind supply quantity is adjusted, third level wind supply quantity is controlled by DNCG/ air communications valve.
In an embodiment of the present invention, portion of air is conveyed by a wind pipe, and passes through Impbin NCG/ air
Portion of air is branched to Impbin NCG pipelines by communicating valve 4；Impbin NCG/ air communications valve 4 is switch valve, it is impossible to is entered
Row flow adjusts, and in the timing of flow velocity one of a wind pipe and First air, the flow of First air passes through 5,6 and 7 three First airs
Flux Valve Control；In an embodiment of the present invention, the size of a wind pipe is φ 800mm, the fluid of First air
The minimum 5 meters/s of speed, now a corresponding air flow control valve aperture minimum 30%, minimum discharge 2.5m3/
s.In the present invention, the flow of first order air feed is preferably 2.5m in the three-level air feed3/ s~3.0m3/s；The first order supplies
The wind supply quantity of wind preferably accounts for the 30%~40% of total wind supply quantity.The present invention reduces burning by reducing First air total blast volume
When excess air coefficient so that liquid methanol burning after caused nitrogen oxides concentration reduce.
In an embodiment of the present invention, portion of air is branched to by Impbin by Impbin NCG/ air communications valve 4
NCG pipelines, its size are DN400mm；Impbin NCG pipelines are passed through stove in the roof of the furnace outer rim of incinerator with vertical direction
Thorax；The wind that Impbin NCG pipelines are passed through forms eddy flow in gas channel, is advantageous to the mixing of gas, and extends air-flow in stove
Residence time in thorax.In embodiments of the present invention, second level air duct of the Impbin NCG pipelines as three-level air feed
Road, the vent flow in the second level air supply line is preferably 1.3m3/ s~1.5m3/s。
In an embodiment of the present invention, portion of air is branched to by DNCG pipelines by DNCG/ air communications valve 3, from
The middle and upper part horizontal direction of incinerator burner hearth is passed through burner hearth, and the air quantity being introduced into by the Valve controlling in DNCG pipelines；It is described
The size of DNCG pipelines is DN 800mm, and the aperture of the DNCG/ air communications valve is preferably 70%~100%, and a part is empty
Gas is directed to DNCG pipelines, so that being moved outside air core, the oxygen concentration of combustion zone reduces near integral combustor, so
The flame temperature in incinerator central burner region can be reduced, and can suppresses the secondary combination of the intermediate product and oxygen of nitrogen, so as to
Reduce the concentration of nitrogen oxides.In the present invention, the vent flow in the DNCG pipelines is preferably 4.0m3/ s~6.0m3/
s。
In the present invention, the temperature of the burning is preferably 800 DEG C~830 DEG C；The furnace temperature of incinerator is preferably by burning
Blowing air in stove is burnt to be regulated and controled.In an embodiment of the present invention, the furnace temperature of incinerator passes through third level air feed in three-level air feed
Regulated and controled, the flow of third level air feed is preferably 4 m in the three-level air feed3/ s~6.0m3/s。
Specifically, the processing method of flue gas nitrogen oxide discharge is when reducing slurry factory foul smell incinerator treatment liquid methanol：
Liquefied gas is lighted a fire after integral combustor sprays, after lighting a fire successfully, starts diesel-oil gun, lights diesel oil, diesel combustion is normal
Afterwards, liquid methanol is lighted；Air uses three-level air feed after primary air fan, adjusts the frequency conversion aperture of primary air fan and once distinguished and admirable
Control valve aperture, reduce First air total flow；Partial air introducing DNCG pipelines are classified, carry out the control of furnace temperature；
Part First air is led in Impbin NCG pipelines to the mixing for carrying out gas, extends stop of the air-flow in incinerator burner hearth
Time.
The present invention carries out nitrous oxides concentration using flue gas automatic monitored control system (CEMS systems) to the product that burning obtains
Detection.Test result shows：The nitrous oxides concentration that method provided by the invention handles to obtain meets national GB1629-1996
Regulation, nitrous oxides concentration is less than 240mg/Nm3。
The invention provides a kind of method that nitrous oxides concentration is reduced during slurry factory foul smell incinerator treatment liquid methanol, bag
Include following steps：Liquid methanol and air are burnt；The air feed pattern of the air is three-level air feed.Experimental result table
It is bright：Nitrous oxides concentration meets the discharge of national regulation in the product obtained using method treatment liquid methanol provided by the invention
Standard, nitrous oxides concentration are less than 240mg/Nm3。
Further, for the present invention by the way that furnace temperature is adjusted into 800 DEG C~830 DEG C, furnace temperature temperature is relatively low, suppresses the knot of nitrogen and oxygen
Close, reduce the discharge capacity of nitrogen oxides.
In order to further illustrate the present invention, with reference to embodiment to a kind of slurry factory foul smell incinerator provided by the invention at
The method that nitrous oxides concentration is reduced when managing liquid methanol is described in detail, but can not be interpreted as them to protect the present invention
Protect the restriction of scope.
Liquefied gas described in following embodiments 1~3 is bought increases income liquefied gas Co., Ltd in Rizhao City.
Embodiment 1
Liquefied gas is lighted a fire in the slurry factory foul smell incinerator shown in Fig. 1, starts diesel-oil gun after lighting a fire successfully, lights bavin
Oil, the flow of the diesel oil is 0.1L/s, and the burning of liquid methanol is carried out after normal operation；
The liquid methanol include 82% methanol, 15% water, 955mg/L dimethyl disulfides, 1750mg/L
1- (methyl mercapto) ethyl mercaptan, 1050mg/L (methyl mercapto) propanethiol, 74mg/L 4- sulfydryls -4- methyl -2 pentanone, 178mg/L
Double (methyl mercapto) ethane, 3250mg/L long-chains sulphur, 15mg/L pyrroles and 160mg/L aliphatic amines；
In combustion, air is divided into three-level air feed, the First air flow control valve aperture after primary air fan
For 30%, the caliber of a wind pipe is φ 800mm, and the flow of First air is 2.5m3/s；
Impbin NCG/ air communications valve is opened, part First air branches to Impbin NCG pipelines, Impbin
Vent flow in NCG pipelines is 1.3m3/s；
DNCG controls valve opening is set to 80%, it is 820 DEG C that part First air, which leads to adjusting furnace temperature in DNCG pipelines, is carried out
The burning of liquid methanol and air, obtains combustion product.
The present invention examines according to method of testing described in above-mentioned technical proposal to the nitrogen oxides in obtained combustion product
Survey, test result shows：The concentration of nitrogen oxides is 235mg/Nm in the product that the embodiment of the present invention 1 obtains3。
Embodiment 2
Liquefied gas is lighted a fire in the slurry factory foul smell incinerator shown in Fig. 1, starts diesel-oil gun after lighting a fire successfully, lights bavin
Oil, the flow of the diesel oil is 0.1L/s, and the burning of liquid methanol is carried out after normal operation；
The liquid methanol include 85% methanol, 12% water, 950mg/L dimethyl disulfides, 1700mg/L
1- (methyl mercapto) ethyl mercaptan, 1090mg/L (methyl mercapto) propanethiol, 70mg/L 4- sulfydryls -4- methyl -2 pentanone, 170mg/L
Double (methyl mercapto) ethane, 3200mg/L long-chains sulphur, 20mg/L pyrroles and 150mg/L aliphatic amines；
In combustion, air is divided into three-level air feed after primary air fan, and the frequency conversion aperture of the primary air fan is
33%, the caliber of a wind pipe is φ 800mm, and the flow of First air is 2.7m3/s；
Impbin NCG/ air communications valve is opened, part First air branches to Impbin NCG pipelines, Impbin
Vent flow in NCG pipelines is 1.4m3/s；
DNCG controls valve opening is set to 85%, it is 830 DEG C that part First air, which leads to adjusting furnace temperature in DNCG pipelines, is carried out
The burning of liquid methanol and air, obtains combustion product.
The present invention examines according to method of testing described in above-mentioned technical proposal to the nitrogen oxides in obtained combustion product
Survey, test result shows：The concentration of nitrogen oxides is 230mg/Nm in the product that the embodiment of the present invention 2 obtains3。
Embodiment 3
Liquefied gas is lighted a fire in the slurry factory foul smell incinerator shown in Fig. 1, starts diesel-oil gun after lighting a fire successfully, lights bavin
Oil, the flow of the diesel oil is 0.1L/s, and the burning of liquid methanol is carried out after normal operation；
The liquid methanol include 84% methanol, 13% water, 945mg/L dimethyl disulfides, 1670mg/L
1- (methyl mercapto) ethyl mercaptan, 1120mg/L (methyl mercapto) propanethiol, 65mg/L 4- sulfydryls -4- methyl -2 pentanone, 160mg/L
Double (methyl mercapto) ethane, 3150mg/L long-chains sulphur, 25mg/L pyrroles and 155mg/L aliphatic amines；
In combustion, after primary air fan, it is divided into three-level air feed, the frequency conversion aperture of the primary air fan is
35%, the caliber of a wind pipe is φ 800mm, and the flow of First air is 3.0m3/s；
Impbin NCG/ air communications valve is opened, part First air branches to Impbin NCG pipelines, Impbin
Vent flow in NCG pipelines is 1.5m3/s；
DNCG controls valve opening is set to 90%, it is 800 DEG C that part First air, which leads to adjusting furnace temperature in DNCG pipelines, is carried out
The burning of liquid methanol and air, obtains combustion product.
The present invention enters according to method of testing described in above-mentioned technical proposal to the nitrous oxides concentration in obtained combustion product
Row detection, test result show：The concentration of nitrogen oxides is 220mg/Nm in the product that the embodiment of the present invention 3 obtains3。
As seen from the above embodiment, the invention provides nitrogen oxygen is reduced during a kind of slurry factory foul smell incinerator treatment liquid methanol
The method of compound concentration of emission, comprises the following steps：Liquid methanol and air are burnt；The air feed pattern of the air is
Three-level air feed.Method provided by the invention is a kind of processing method of liquid methanol, test result indicates that：This method treatment fluid
Nitrous oxides concentration meets the discharge standard of national regulation in the product that body methanol obtains, less than 240mg/Nm3。
Further, for the present invention by the way that furnace temperature is adjusted into 800 DEG C~830 DEG C, furnace temperature temperature is relatively low, suppresses the knot of nitrogen and oxygen
Close, reduce the discharge capacity of nitrogen oxides.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (4)
1. reducing the method for nitrous oxides concentration during a kind of slurry factory foul smell incinerator treatment liquid methanol, comprise the following steps：
Liquid methanol and air are burnt；The liquid methanol includes methanol, water, sulfur-containing compound and nitrogen-containing compound,
The mass content of the methanol is 82%~85%, and the mass content of the water is 12%~15%；
The air feed pattern of the air is three-level air feed；First order air feed reduces excess air coefficient during burning so that liquid
The concentration of caused nitrogen oxides reduces after the burning of body methanol；Second level air feed forms eddy flow, is advantageous to the mixing of gas, and prolong
Residence time of the long air-flow in burner hearth；3rd pole air feed can reduce the flame temperature in incinerator central burner region, and can
Suppress the secondary combination of the intermediate product and oxygen of nitrogen, so as to reduce the concentration of nitrogen oxides；
The flow of first order air feed is 2.5m in the three-level air feed3/ s~3.0m3/s；
The flow of second level air feed is 1.3m in the three-level air feed3/ s~1.5m3/s；
The flow of third level air feed is 4m in the three-level air feed3/ s~6.0m3/s；
The temperature of the burning is 800 DEG C~830 DEG C, suppresses the combination of nitrogen and oxygen, reduces the discharge capacity of nitrogen oxides.
2. according to the method for claim 1, it is characterised in that the flow of the liquid methanol is 0.4L/s~0.6L/s.
3. according to the method for claim 1, it is characterised in that the wind supply quantity of the first order air feed accounts for three-level air feed and always supplied
The 30%~40% of air quantity.
4. according to the method for claim 1, it is characterised in that the burning is carried out in incinerator；The incinerator
Furnace temperature by into incinerator blowing air regulated and controled.
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Denomination of invention: A method for reducing nitrogen oxide concentration when treating liquid methanol in pulp plant odor incinerator Effective date of registration: 20211224 Granted publication date: 20171212 Pledgee: Rizhao Bank Co., Ltd Pledgor: ASIA SYMBOL (SHANDONG) PULP AND PAPER Co.,Ltd. Registration number: Y2021980016162 |
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