CN112255363A - Natural gas hydrogen-doped gas qualification judgment method for gas terminal user system - Google Patents
Natural gas hydrogen-doped gas qualification judgment method for gas terminal user system Download PDFInfo
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- CN112255363A CN112255363A CN202011079762.7A CN202011079762A CN112255363A CN 112255363 A CN112255363 A CN 112255363A CN 202011079762 A CN202011079762 A CN 202011079762A CN 112255363 A CN112255363 A CN 112255363A
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- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/12—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using combustion
Abstract
The invention discloses a qualification judgment method for natural gas hydrogen-doped gas for a gas terminal user system, which comprises the steps of calculating relevant parameters of target gas after mixing hydrogen and natural gas according to a set calculation method, and detecting the whitening number of mixed gas, the combustion potential of the mixed gas and the hydrogen partial pressure value according to judgment conditions so as to detect whether the target gas after mixing hydrogen is qualified or not and can be safely used or not. The invention can realize energy conversion, solves the dilemma of single and scarce energy resources, is an energy revolution, and can reduce carbon emission and improve atmospheric environment.
Description
Technical Field
The invention relates to the field of gas, in particular to a qualification judgment method for natural gas hydrogen doping for a gas terminal user system.
Background
At present, natural gas is a single gas source, the risk exists in the safe and stable energy supply, energy conversion can be realized by blending hydrogen with natural gas, the dilemma of single and scarce energy resources is solved, the energy revolution is realized, and simultaneously, the carbon emission can be reduced, and the atmospheric environment is improved. The influence of hydrogen mixed into natural gas on a conveying pipeline and a terminal burner needs to be further researched, and the hydrogen preparation cost needs to be optimized.
Disclosure of Invention
The invention aims to provide a qualification judgment method for natural gas hydrogen doping for a gas terminal user system, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the qualification judgment method for the natural gas hydrogen-doped gas used for the gas terminal user system is characterized by comprising the following steps:
step 1, calculating gas density and gas relative density;
step 2, calculating a gas heat value;
step 3, calculating the gas whitening number, the gas combustion potential and the hydrogen partial pressure;
step 4, setting judgment conditions;
and 5, outputting the judgment result.
Preferably, in the step 1, the specific content is as follows:
firstly setting initial parameters and setting the volume ratio of hydrogen to VhHydrogen density is rhohOther gas volume ratio is ViAnd the density of other gases is rhoiThe density of the hydrogen gas before doping is rho, the relative density of the hydrogen gas before doping is S, the density of the hydrogen gas after doping is rho ', and the relative density of the hydrogen gas after doping is S', which can be obtained by the formula (1), the formula (2), the formula (3) and the formula (4),
ρ＝Viρi (1)
S＝ρ/1.293 (2)
ρ′＝Vhρh+Viρi (3)
S′＝ρ′/1.293 (4)
preferably, in the step 2, the specific content is as follows:
setting the heat value H of hydrogenhThe other gas has a heat value of HiThe calorific value H of the gas before doping hydrogen and the calorific value H' of the mixed gas can be obtained by the formulas (5) and (6),
H＝ViHi (5)
H′＝VhHh+ViHi (6)
preferably, in step 3, the specific content is as follows:
3-1) the gore number of the gas before doping hydrogen is W, and the gore number of the mixed gas after doping hydrogen is W', which can be obtained by the formulas (7) and (8),
W＝H/S (7)
W′＝H′/S′ (8)
3-2) constant a, b, C, d, combustion potential of gas before doping hydrogen is CpThe combustion potential of the mixed gas after doping hydrogen is Cp' obtained from the formulae (9) and (10),
Cp＝(aH2+bCO+cH4+dCnHm)/S (9)
Cp′＝(aH2+bCO+cH4+dCnHm)/S′ (10)
3-3) setting the upper limit value of the hydrogen content as PhHydrogen partial pressure P of mixed gas after doping hydrogenh', is obtained from the formula (11),
Ph′＝PVh (11)
p represents the mixed gas pressure.
Preferably, in the step 4, the specific content is as follows:
the mixed gas applicability judgment formula is as follows:
W′-W≤10％ (12)
Cp′-Cp≤10％ (13)
Ph′≤Ph (14)
preferably, in the step 5, the specific content is as follows:
5-1) if the formula (12), the formula (13) and the formula (14) are simultaneously established, the target mixed gas is applicable and qualified;
5-2) if any of the formula (12), the formula (13) and the formula (14) does not hold, it means that the target mixed gas is not suitable for use and is not acceptable.
Compared with the prior art, the invention has the beneficial effects that:
1. at present, natural gas is a single gas source, and risks exist in safe and stable energy supply.
2. The invention mixes hydrogen into natural gas, which can solve the dilemma of single and scarce energy resource and realize energy revolution.
3. The invention obtains qualified mixed gas by adding hydrogen, can reduce carbon emission and improve atmospheric environment.
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: the qualification judgment method for the natural gas hydrogen-doped gas used for the gas terminal user system is characterized by comprising the following steps:
step 1, calculating gas density and gas relative density;
step 2, calculating a gas heat value;
step 3, calculating the gas whitening number, the gas combustion potential and the hydrogen partial pressure;
step 4, setting judgment conditions;
and 5, outputting the judgment result.
The specific content of the step 1 is as follows:
firstly setting initial parameters and setting the volume ratio of hydrogen to VhHydrogen density is rhohOther gas volume ratio is ViAnd the density of other gases is rhoiThe density of the hydrogen gas before doping is rho, the relative density of the hydrogen gas before doping is S, the density of the hydrogen gas after doping is rho ', and the relative density of the hydrogen gas after doping is S', which can be obtained by the formula (1), the formula (2), the formula (3) and the formula (4),
ρ＝Viρi (1)
S＝ρ/1.293 (2)
ρ′＝Vhρh+Viρi (3)
S′＝ρ′/1.293 (4)
the specific content of the step 2 is as follows:
setting the heat value H of hydrogenhThe other gas has a heat value of HiThe calorific value H of the gas before doping hydrogen and the calorific value H' of the mixed gas can be obtained by the formulas (5) and (6),
H＝ViHi (5)
H′＝VhHh+ViHi (6)
the specific content of the step 3 is as follows:
3-1) the gore number of the gas before doping hydrogen is W, and the gore number of the mixed gas after doping hydrogen is W', which can be obtained by the formulas (7) and (8),
W＝H/S (7)
W′＝H′/S′ (8)
3-2) constant a, b, C, d, combustion potential of gas before doping hydrogen is CpThe combustion potential of the mixed gas after doping hydrogen is Cp' obtained from the formulae (9) and (10),
Cp＝(aH2+bCO+cH4+dCnHm)/S (9)
Cp′＝(aH2+bCO+cH4+dCnHm)/S′ (10)
3-3) setting the upper limit value of the hydrogen content as PhHydrogen partial pressure P of mixed gas after doping hydrogenh', is obtained from the formula (11),
Ph′＝PVh (11)
p represents the mixed gas pressure.
The specific content of the step 4 is as follows:
the mixed gas applicability judgment formula is as follows:
W′-W≤10％ (12)
Cp′-Cp≤10％ (13)
Ph′≤Ph (14)
the specific steps are as follows:
5-1) if the formula (12), the formula (13) and the formula (14) are simultaneously established, the target mixed gas is applicable and qualified;
5-2) if any of the formula (12), the formula (13) and the formula (14) does not hold, it means that the target mixed gas is not suitable for use and is not acceptable.
The invention has the advantages that: the invention fills the blank of the technical field in China; realizing energy revolution and atmospheric environment protection.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The qualification judgment method for the natural gas hydrogen-doped gas used for the gas terminal user system is characterized by comprising the following steps:
step 1, calculating gas density and gas relative density;
step 2, calculating a gas heat value;
step 3, calculating the gas whitening number, the gas combustion potential and the hydrogen partial pressure;
step 4, setting judgment conditions;
and 5, outputting the judgment result.
2. The method for determining qualification of natural gas-doped hydrogen for a gas end user system according to claim 1, wherein the specific contents in the step 1 are as follows:
firstly setting initial parameters and setting the volume ratio of hydrogen to VhHydrogen density is rhohOther gas volume ratio is ViAnd the density of other gases is rhoiThe density of the hydrogen gas before doping is rho, the relative density of the hydrogen gas before doping is S, the density of the hydrogen gas after doping is rho ', and the relative density of the hydrogen gas after doping is S', which can be obtained by the formula (1), the formula (2), the formula (3) and the formula (4),
ρ＝Viρi (1)
S＝ρ/1.293 (2)
ρ′＝Vhρh+Viρi (3)
S′＝ρ′/1.293 (4)。
3. the method for determining qualification of natural gas-doped hydrogen for gas end user system according to claim 1, wherein in the step 2, the specific contents are as follows:
setting the heat value H of hydrogenhThe other gas has a heat value of HiThe calorific value H of the gas before doping hydrogen and the calorific value H' of the mixed gas can be obtained by the formulas (5) and (6),
H＝ViHi (5)
H′＝VhHh+ViHi (6)。
4. the method for determining qualification of natural gas-doped hydrogen for gas end user system according to claim 1, wherein the specific content in the step 3 is as follows:
3-1) the gore number of the gas before doping hydrogen is W, and the gore number of the mixed gas after doping hydrogen is W', which can be obtained by the formulas (7) and (8),
W＝H/S (7)
W′＝H′/S′ (8)
3-2) constant a, b, C, d, combustion potential of gas before doping hydrogen is CpThe combustion potential of the mixed gas after doping hydrogen is Cp' obtained from the formulae (9) and (10),
Cp＝(aH2+bCO+cH4+dCnHm)/S (9)
Cp′＝(aH2+bCO+cH4+dCnHm)/S′ (10)
3-3) setting the upper limit value of the hydrogen content as PhHydrogen partial pressure P of mixed gas after doping hydrogenh', is obtained from the formula (11),
Ph′＝PVh (11)
p represents the mixed gas pressure.
5. The method for determining qualification of natural gas-doped hydrogen for gas end user system according to claim 1, wherein in the step 4, the specific contents are as follows:
the mixed gas applicability judgment formula is as follows:
W′-W≤10％ (12)
Cp′-Cp≤10％ (13)
Ph′≤Ph (14)。
6. the qualification determination method for natural gas hydrogen-doped gas for gas end user systems according to claim 6, wherein in the step 5, the specific contents are as follows:
5-1) if the formula (12), the formula (13) and the formula (14) are simultaneously established, the target mixed gas is applicable and qualified;
5-2) if any of the formula (12), the formula (13) and the formula (14) does not hold, it means that the target mixed gas is not suitable for use and is not acceptable.
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Application publication date: 20210122 |