CN111214784A - Adopt nitrogen gas to carry out safety protection's city utility tunnel system - Google Patents
Adopt nitrogen gas to carry out safety protection's city utility tunnel system Download PDFInfo
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- CN111214784A CN111214784A CN201811404156.0A CN201811404156A CN111214784A CN 111214784 A CN111214784 A CN 111214784A CN 201811404156 A CN201811404156 A CN 201811404156A CN 111214784 A CN111214784 A CN 111214784A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 500
- 229910001873 dinitrogen Inorganic materials 0.000 title claims abstract description 109
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 195
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 86
- 238000004880 explosion Methods 0.000 claims abstract description 41
- 239000003345 natural gas Substances 0.000 claims abstract description 37
- 239000007789 gas Substances 0.000 claims description 106
- 238000003860 storage Methods 0.000 claims description 53
- 239000007788 liquid Substances 0.000 claims description 38
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 15
- 238000004806 packaging method and process Methods 0.000 claims description 9
- 239000007921 spray Substances 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 abstract description 10
- 230000001629 suppression Effects 0.000 abstract description 10
- 239000000843 powder Substances 0.000 abstract description 6
- 239000000443 aerosol Substances 0.000 abstract description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 description 5
- 230000005611 electricity Effects 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000002401 inhibitory effect Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000011261 inert gas Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 206010019233 Headaches Diseases 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000009982 effect on human Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 231100000869 headache Toxicity 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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Classifications
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/02—Fire prevention, containment or extinguishing specially adapted for particular objects or places for area conflagrations, e.g. forest fires, subterranean fires
- A62C3/0221—Fire prevention, containment or extinguishing specially adapted for particular objects or places for area conflagrations, e.g. forest fires, subterranean fires for tunnels
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C35/00—Permanently-installed equipment
- A62C35/02—Permanently-installed equipment with containers for delivering the extinguishing substance
- A62C35/11—Permanently-installed equipment with containers for delivering the extinguishing substance controlled by a signal from the danger zone
- A62C35/13—Permanently-installed equipment with containers for delivering the extinguishing substance controlled by a signal from the danger zone with a finite supply of extinguishing material
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C35/00—Permanently-installed equipment
- A62C35/58—Pipe-line systems
- A62C35/64—Pipe-line systems pressurised
- A62C35/645—Pipe-line systems pressurised with compressed gas in pipework
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C5/00—Making of fire-extinguishing materials immediately before use
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
Abstract
The invention discloses an urban underground comprehensive pipe gallery system adopting nitrogen for safety protection, which comprises a nitrogen gas supply device (10), a nitrogen gas conveying pipeline (20) and an underground comprehensive pipe gallery (30) which are sequentially connected, wherein a nitrogen gas control valve is arranged on the nitrogen gas conveying pipeline (20), and the nitrogen gas conveying pipeline (20) can convey nitrogen gas in the nitrogen gas supply device (10) into the underground comprehensive pipe gallery (30). The urban underground comprehensive pipe gallery system adopting nitrogen for safety protection has two functions of electric cabin fire extinguishing and natural gas cabin explosion suppression, and has the advantages of low investment and low extinguishing compared with a hot aerosol and superfine dry powder fire extinguishing systemThe fire agent can be stored permanently without failure and need to be replaced, compared with CO2The fire extinguishing system has the advantages of low investment and high safety to people, and has great prospect.
Description
Technical Field
The invention relates to an urban underground comprehensive pipe gallery system adopting nitrogen for safety protection.
Background
The urban underground comprehensive pipe gallery comprises an electric cabin, a hydrothermal cabin, a sewage cabin and a gas cabin, wherein a large number of cables are laid in the electric cabin, an electric fire can happen, a natural gas pipeline is laid in the gas cabin, once natural gas leaks, an explosion accident can happen, so that the electric cabin and the gas cabin are high in danger, and certain protective measures are required. At present, the electric cabin mainly adopts a hot aerosol or superfine dry powder fire extinguishing mode, and the gas cabin has no measure for inhibiting natural gas explosion. The hot aerosol or the superfine dry powder is a chemical synthetic medicament, is expensive, has a use validity period, needs to be replaced after the medicament validity period is exceeded, and costs are paid for purchasing the new medicament. Meanwhile, the hot aerosol or the superfine dry powder can pollute the environment after being sprayed, and is not clean and environment-friendly.
Disclosure of Invention
In order to ensure that the fire extinguishing mode of the comprehensive pipe gallery can achieve cleanness, environmental protection, safety, high efficiency and economy. The invention provides an urban underground comprehensive pipe gallery system adopting nitrogen for safety protection, which has two functions of electric cabin fire extinguishing and natural gas cabin explosion suppression, has the advantages of low investment compared with a thermosol and superfine dry powder fire extinguishing system, permanent storage of a fire extinguishing agent without failure and replacement compared with a CO (carbon monoxide) fire extinguishing system2The fire extinguishing system has the advantages of low investment and high safety to people, and has great prospect.
The technical invention for solving the technical problems is as follows: the utility model provides an adopt nitrogen gas to carry out safety protection's city utility tunnel system, includes nitrogen gas air feeder, nitrogen gas pipeline and the utility tunnel that connects gradually, is equipped with nitrogen gas control flap on the nitrogen gas pipeline, and nitrogen gas pipeline can carry the nitrogen gas in the nitrogen gas air feeder to in the utility tunnel.
The utility tunnel contains electricity cabin and gas cabin, and nitrogen gas pipeline is connected with electricity cabin and gas cabin, and nitrogen gas pipeline can carry the nitrogen gas in the nitrogen gas air feeder to utility tunnel's electricity cabin and gas cabin.
The nitrogen gas supply device comprises one or more of a gas storage bottle gas supply system, a nitrogen making unit gas supply system and a liquid nitrogen storage tank gas supply system.
The gas storage cylinder gas supply system comprises a nitrogen steel cylinder and a gas cylinder packaging grid, and the nitrogen steel cylinder is arranged in the gas cylinder packaging grid.
The nitrogen making unit gas supply system comprises a nitrogen making unit, a supercharger and a nitrogen gas storage tank which are connected in sequence.
The liquid nitrogen storage tank gas supply system comprises a liquid nitrogen storage tank, a liquid nitrogen pump, an air temperature type gasifier and a nitrogen gas storage tank which are connected in sequence.
The nitrogen gas pipeline contains the nitrogen gas trunk line, the electric cabin nitrogen gas delivery lateral conduit and the gas cabin nitrogen gas delivery lateral conduit that connect gradually, and along utility tunnel's length direction, utility tunnel contains a plurality of protection subareas, electric cabin nitrogen gas delivery lateral conduit with the electric cabin one-to-one in the protection subarea is connected, gas cabin nitrogen gas delivery lateral conduit with gas cabin one-to-one in the protection subarea is connected.
The nitrogen control valve is arranged on the electric cabin nitrogen conveying branch pipeline and the gas cabin nitrogen conveying branch pipeline, the nitrogen control valve comprises a stop valve and a pneumatic stop valve, the stop valve and the pneumatic stop valve are in a normally open state, and the pneumatic stop valve is in a normally closed state.
Adopt nitrogen gas to carry out safety protection's city utility tunnel system still includes control unit and first detecting element, this first detecting element sets up in the electricity under-deck, pneumatic trip valve is connected with this control unit, this first detecting element is connected with this control unit, when this first detecting element detects the electricity under-deck when having the condition of a fire, this control unit sends the signal of opening for the pneumatic trip valve on the electric cabin nitrogen gas transport branch pipeline after 30 seconds postpone, the pneumatic trip valve on the electric cabin nitrogen gas transport branch pipeline will be opened and make the electric cabin nitrogen gas transport branch pipeline spout nitrogen gas 60 seconds.
The city underground comprehensive pipe gallery system adopting nitrogen for safety protection further comprises a control unit and a second detection unit, the second detection unit is arranged in the gas cabin, the pneumatic stop valve is connected with the control unit, the second detection unit is connected with the control unit, and when the second detection unit detects that natural gas exists in the gas cabin and the concentration of the natural gas rises to 20% of the lower explosion limit value, the control unit starts a ventilator in the gas cabin; when the second detection unit detects that natural gas exists in the gas cabin and the concentration of the natural gas rises to 80% of the lower explosion limit value, the control unit sends an opening signal to a pneumatic stop valve on the gas cabin nitrogen conveying branch pipeline, and the pneumatic stop valve on the gas cabin nitrogen conveying branch pipeline is opened to enable the gas cabin nitrogen conveying branch pipeline to continuously spray nitrogen.
The invention has the beneficial effects that:
1. the fire extinguishing agent has the five characteristics of cleanness, environmental protection, safety, high efficiency and economy, and is superior to the existing chemical agent fire extinguishing mode;
2. the natural gas explosion suppression method can effectively suppress natural gas explosion in the gas cabin, and fills the blank of the gas cabin explosion suppression method.
3. The nitrogen is applied to the safety protection of the urban underground comprehensive pipe gallery, and the nitrogen can extinguish fire and suppress explosion and has double functions.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic view of the overhead structure of the urban underground pipe gallery system adopting nitrogen for safety protection.
Fig. 2 is a schematic sectional structure view of the urban underground comprehensive pipe gallery system adopting nitrogen for safety protection.
Figure 3 is a schematic of the effect of nitrogen on the explosion limit of methane.
10. A nitrogen gas supply device; 20. a nitrogen gas delivery pipe; 30. an underground comprehensive pipe gallery;
11. a gas cylinder gas supply system; 12. a nitrogen generating unit gas supply system; 13. a liquid nitrogen storage tank gas supply system;
21. a main nitrogen conveying pipeline; 22. a nitrogen conveying branch pipeline of the electric cabin; 23. a gas cabin nitrogen conveying branch pipeline; 24. a pneumatic shut-off valve; 25. a stop valve;
31. an electrical compartment; 32. a gas cabin.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The utility model provides an adopt nitrogen gas to carry out safety protection's city utility tunnel system, includes nitrogen gas air feeder 10, nitrogen gas pipeline 20 and the utility tunnel 30 that connects gradually, is equipped with nitrogen gas control valve on the nitrogen gas pipeline 20, and nitrogen gas pipeline 20 can carry the nitrogen gas in the nitrogen gas air feeder 10 to the utility tunnel 30 in, as shown in figure 1 and figure 2.
In this embodiment, utility tunnel 30 contains electric cabin 31 and gas cabin 32, is equipped with the cable in the electric cabin 31, is equipped with the gas pipeline in the gas cabin 32, and nitrogen gas pipeline 20 is connected with electric cabin 31 and gas cabin 32, and nitrogen gas pipeline 20 can carry the nitrogen gas in the nitrogen gas air feeder 10 to in the electric cabin 31 and the gas cabin 32 of utility tunnel 30 to realize putting out a fire and suppressing explosion function.
In the present embodiment, the nitrogen gas supply device 10 includes one or more of a gas cylinder gas supply system 11, a nitrogen generator set gas supply system 12, and a liquid nitrogen storage tank gas supply system 13. The gas storage cylinder gas supply system 11 comprises a nitrogen gas steel cylinder and a gas cylinder packaging grid, and the nitrogen gas steel cylinder is arranged in the gas cylinder packaging grid. The nitrogen making unit gas supply system 12 comprises a nitrogen making unit, a supercharger and a nitrogen gas storage tank which are connected in sequence. The liquid nitrogen storage tank gas supply system 13 comprises a liquid nitrogen storage tank, a liquid nitrogen pump, an air temperature type gasifier and a nitrogen gas storage tank which are connected in sequence.
In this embodiment, nitrogen gas conveying pipeline 20 contains the nitrogen gas main delivery pipe 21, electric cabin nitrogen gas delivery branch pipeline 22 and the gas cabin nitrogen gas delivery branch pipeline 23 that connect gradually, and along utility tunnel 30's length direction, the upper and lower direction in figure 1 promptly, utility tunnel 30 contains a plurality of protection subareas, electric cabin nitrogen gas delivery branch pipeline 22 with electric cabin 31 one-to-one in the protection subarea is connected, gas cabin nitrogen gas delivery branch pipeline 23 with gas cabin 32 one-to-one in the protection subarea is connected.
In this embodiment, the nitrogen control valve is disposed on the electric cabin nitrogen conveying branch pipe 22 and the gas cabin nitrogen conveying branch pipe 23, the nitrogen control valve includes a stop valve 25 and a pneumatic cut-off valve 24, the stop valve 25 and the pneumatic cut-off valve 24, the stop valve 25 is in a normally open state, and the pneumatic cut-off valve 24 is in a normally closed state.
The nitrogen fire extinguishing performance and advantages are as follows:
the fire extinguishing performance of a nitrogen fire extinguishing system depends mainly on the inertness of pure nitrogen. With the flooding process of pure nitrogen, the oxygen in the protective gas is continuously reduced. The oxygen supply to the flame is cut off, resulting in a reduction in the combustion rate and the temperature at the bottom of the flame. When the temperature drops below 500 ℃, the flame is extinguished. When the concentration of oxygen in the air drops below 15%, combustion will not continue. The nitrogen fire extinguishing system is used for extinguishing fire by reducing the oxygen concentration in the air to about 12.5%. An oxygen concentration of 12.5% corresponds to a person breathing at an altitude of 5000 m, and it has been proved that there is no adverse effect on the human body if the person is in such an environment for a period of time not exceeding 60 minutes. Normally the proportion of oxygen in air is 21%, nitrogen 78% and the others 1%. After the nitrogen system was released, the oxygen content was about 12.5%, the nitrogen content was about 86.5%, and the others were 1%. In this ratio, the density of nitrogen gas is substantially equal to that of air, so that nitrogen gas can be uniformly retained in the fire extinguishing area after fire extinguishing, thereby achieving good fire extinguishing effect, and at the same time, since a single component fire extinguishing agent is used, separation is not generated, thereby maintaining a sufficiently long fire extinguishing impregnation time. The nitrogen comes from air, returns to the atmosphere after fire extinguishing and spraying, has no influence on the environment, and is a clean and environment-friendly excellent fire extinguishing agent capable of saving energy. The specific indexes are as follows: the Ozone Depletion Potential (ODP) of nitrogen is 0, and the potential of generating global greenhouse effect isThe value (GWP) is likewise 0. The nitrogen is used as a fire extinguishing agent, is not a synthetic product, can be directly extracted from the air, has low filling cost, has no chemical reagent residue possibly existing in the synthetic gas, and is safe and reliable. The best extinguishing performance so far is CO2And secondly nitrogen. But CO2Inherently toxic, CO2When the concentration reaches 3%, the headache has slight effect on human bodies, when the concentration reaches 5%, people must leave, when the concentration reaches 10%, people can lose consciousness rapidly, and when the concentration reaches 30%, people can die in seconds. And the nitrogen has no toxicity, and the safety is very high as long as the fire extinguishing concentration is reasonably controlled. In addition, the nitrogen system does not generate fog after being released, and CO does not generate fog2After the rapid spraying, the fire with high temperature can generate white fog to block the view of indoor personnel for escaping, so that the speed of indoor personnel escaping from the fire scene in time is reduced, and the safety of personnel is greatly reduced. In a word, the nitrogen is used for extinguishing the fire of the urban underground comprehensive pipe gallery, has five advantages of cleanness, environmental protection, safety, high efficiency and economy, and has the advantages that a chemical synthetic fire extinguishing agent and a carbon dioxide fire extinguishing agent do not have.
Calculating the nitrogen consumption of the underground pipe gallery electric cabin fire extinguishing system:
at present, the nitrogen fire extinguishing calculation is carried out by taking a city underground pipe gallery in a certain place as an example. The calculation formula comes from the system design of chapter 3 in CECS312-2012 technical Specification for inert gas fire extinguishing System and DB13(J) -T143-2012 technical Specification for storage tank type Nitrogen fire extinguishing System design of chapter 4. The formula for calculating the amount of nitrogen fire suppressant in both procedures is the same. The underground pipe gallery electric cabin of a certain road is divided into 4 fireproof subareas. The underground pipe gallery electric cabin nitrogen fire extinguishing system is designed according to a combined distribution system, and one combined distribution system can protect 8 protection areas at most. The nitrogen gas reserve of the combined distribution fire extinguishing system is determined according to the reserve of the fire protection subarea with the largest volume. The volume of the fire-proof subarea with the largest volume in the 4 fire-proof subareas is 1656m3(180 m.times.2.3 m.times.4 m). The minimum designed fire extinguishing concentration of the electric cabin is 41.5 percent, the consumption of the nitrogen fire extinguishing agent is calculated to be 1186Kg, and the volume of the nitrogen under the standard condition is 948Nm3。
Several nitrogen storage modes of the nitrogen fire extinguishing system are compared:
1. steel cylinder group gas storage and supply system
The gas storage capacity of a 40 liter nitrogen cylinder is 6Nm3(the pressure of nitrogen in the nitrogen cylinder is 15MPa), and 158 bottles of 40 liters of nitrogen cylinders are required. The nitrogen storage adopts a gas cylinder packaging grid type. Every nitrogen gas steel bottle collection check stores 20 steel bottles, establishes 8 groups of nitrogen gas steel bottle collection check altogether, and the adjacent arrangement, nitrogen gas steel bottle are total 160. A rainproof shed is arranged on the gas cylinder packaging grid group, a circle of steel structure fence is arranged around the rainproof shed, and a double door is arranged on one side of the fence. The nitrogen in the 8 groups of nitrogen steel cylinder packaging grids is decompressed to about 0.8MPa through a decompressor and then is connected into a DN150 nitrogen main pipeline. The price estimation details of the equipment of the gas storage and supply system of the steel cylinder group are shown in the table 1.
TABLE 1 price estimation table for steel cylinder group gas storage and supply system equipment
| System main equipment | Price of equipment ten thousand yuan | |
| 1 | Nitrogen steel cylinder | 6.4 |
| 2 | Nitrogen steel cylinder collection dress check | 2.4 |
| Total up to | 8.8 |
A 40 liter nitrogen gas steel cylinder (the gas storage amount is 6 Nm)3) The cost is 15 yuan, and the 160 bottles are filled for 2400 yuan.
2. Nitrogen generator set gas supply system
The nitrogen making unit mode gas supply system consists of a nitrogen making unit, a supercharger and a nitrogen storage tank, the nitrogen making unit adopts a pressure swing adsorption nitrogen making mode, the pressure of nitrogen sent by a pressure swing adsorption device is about 0.6MPa, the nitrogen is pressurized to 3.0MPa by the supercharger and then enters the nitrogen storage tank, and the water volume of the gas storage tank is 50m3Vertical tanks or horizontal tanks are used. (the vertical tank occupies a small area, but the height is higher, which may affect the urban beauty, and the horizontal tank occupies a larger area) a set of nitrogen making capacity of 100Nm is selected3The small pressure swing adsorption nitrogen making unit of the/h can continuously operate for 10 hours to reach 50m3The nitrogen tank is full of gas, and then the nitrogen making unit and the supercharger are both stopped. The outlet pipeline of the nitrogen tank is provided with a self-operated nitrogen pressure regulating valve, so that the pressure of nitrogen is stabilized at 0.8MPa after the pressure regulating valve is used. The nitrogen making unit is in a shutdown state at ordinary times, and the nitrogen making unit works again only after all the nitrogen in the nitrogen tank is used up. In order to protect the nitrogen generating unit and the supercharger and prolong the service life of the nitrogen generating unit and the supercharger, the nitrogen generating unit and the supercharger need to be arranged indoors, so that a closed room needs to be built. The nitrogen storage tank can be arranged in the open air. The equipment price estimation of the nitrogen making unit gas supply system is detailed in table 2.
TABLE 2 price estimation table for nitrogen generator set air supply system equipment
| System main equipment | Price of equipment ten thousand yuan | |
| 1 | |
15 |
| 2 | |
15 |
| 3 | Nitrogen |
20 |
| Total up to | 50 |
The raw material gas for pressure swing adsorption nitrogen production is air, and the cost of the raw material gas is zero.
3. Gas supply system of liquid nitrogen storage tank
The gas supply system of the liquid nitrogen storage tank consists of the liquid nitrogen storage tank, a liquid nitrogen pump, an air temperature type gasifier and a nitrogen gas storage tank. Selecting a volume of 2m3The liquid nitrogen in the liquid nitrogen storage tank can generate about 1000Nm after the liquid nitrogen in the storage tank is gasified3Of nitrogen (c). Pressurizing liquid nitrogen to 3.0MPa by a liquid nitrogen pump, introducing the liquid nitrogen into an air-temperature gasifier, gasifying the liquid nitrogen into nitrogen, and introducing the nitrogen into water with the volume of 50m3And storing the nitrogen gas storage tank. The outlet pipeline of the nitrogen tank is provided with a self-operated nitrogen pressure regulating valve, so that the pressure of nitrogen is stabilized at 0.8MPa after the pressure regulating valve is used. The liquid nitrogen pump does not work at ordinary times, when the nitrogen in the nitrogen tank is completely used up, the liquid nitrogen is added into the liquid nitrogen storage tank through the tank car, and then the liquid nitrogen pump works again to store the gas in the nitrogen tank. In order to prevent natural evaporation of liquid nitrogen in the liquid nitrogen storage tank, the liquid nitrogen storage tank may be empty when the nitrogen tank is filled with gas. The liquid nitrogen storage tank, the liquid nitrogen pump, the air temperature type gasifier and the nitrogen storage tank can be arranged in the open air, and a room does not need to be built. Liquid nitrogen storage tank gas supply system equipment priceThe grid estimates are detailed in table 3.
TABLE 3 price estimation table for equipment of gas supply system of liquid nitrogen storage tank
| System main equipment | Price of equipment ten thousand yuan | |
| 1 | Liquid |
2 |
| 2 | |
2 |
| 3 | Air-temperature gasifier | 3 |
| 4 | Nitrogen |
20 |
| Total up to | 27 |
Fill 2m3The cost of the liquid nitrogen is about 1200 yuan.
4. The nitrogen fire-extinguishing system conveying and spraying control process is explained as follows:
nitrogen gas through above three kinds of mode outputs all inserts underground pipe gallery electric cabin through a DN150 trunk line, connects out a nitrogen gas lateral conduit from the nitrogen gas trunk line in every protected area, and a stop valve and a pneumatic trip valve are established to lateral conduit starting point department. The stop valve is normally open, and the pneumatic stop valve is normally closed. When a fire alarm system in a certain electric cabin detects a fire condition, a fire extinguishing instruction signal is sent to the fire extinguishing control panel, after 30 seconds of delay, the fire extinguishing control panel sends a discharge signal to open the pneumatic stop valve, the pneumatic stop valve opens the nitrogen gas discharge to extinguish the fire, and the nitrogen gas discharge time is 60 seconds.
Three gas supply systems of the nitrogen fire extinguishing system are compared:
the three nitrogen supply systems are more fully described in table 4.
TABLE 4 comparison of three nitrogen gas supply systems
And (3) fire extinguishing mode comparison:
at present, the underground pipe gallery electric cabin mainly adopts two automatic fire extinguishing modes of hot aerosol and superfine dry powder, and a nitrogen and carbon dioxide fire extinguishing mode is not adopted, so that the investment of the four fire extinguishing modes is compared, and the detailed table 5 shows.
TABLE 5 COMPARATIVE TABLE FOR THREE FIRE-EXTINGUISHING MODES
As can be seen from the comparison of the table above, the nitrogen fire extinguishing system has low investment and is a one-time investment, and the agent does not need to be replaced. Once a fire occurs, refilling with nitrogen is also very cost effective.
Nitrogen explosion suppression system description:
besides being used for extinguishing fire in an electric cabin, the nitrogen can also be used for suppressing explosion in a natural gas cabin.
Nitrogen explosion suppression performance specification and explosion suppression nitrogen consumption calculation:
after natural gas leaks from the natural gas cabin of the underground comprehensive pipe gallery, the content of the natural gas in the cabin cannot be controlled below the lower explosion limit only by ventilation of the ventilator, and once the content of the natural gas in the cabin is higher than the lower explosion limit, the possibility of explosion is generated, and the consequences are serious. Therefore, the explosion suppression cannot be achieved only by means of the ventilation system, and the nitrogen gas as the inert gas has the explosion suppression performance.
The methane content in the natural gas accounts for more than 90 percent. The lower explosion limit of methane in air is 5% and the upper explosion limit is 15%. The nitrogen content as inert gas has a very great influence on the explosive properties of the methane-air system. As the nitrogen component in the mixed gas is increased, the upper explosion limit is obviously reduced, the lower explosion limit is slowly increased, the range of the explosion limit is obviously narrowed, and the explosion risk is obviously reduced. When the nitrogen content is increased to a certain value, the upper explosion limit and the lower explosion limit intersect at a point. After that, if the content of nitrogen is further increased, no explosion occurs regardless of the change in the volume fraction of methane in the mixed gas. Therefore, as long as enough nitrogen is injected into the air to reach the minimum inerting concentration of the nitrogen for inhibiting methane explosion, the natural gas leaked into the underground pipe gallery natural gas cabin cannot explode, as shown in fig. 3.
Calculating the explosion suppression nitrogen consumption:
according to the regulations in the technical code of the storage tank type nitrogen fire-extinguishing system, the minimum inerting concentration of the nitrogen for inhibiting the methane explosion is 47.3 percent. The volume of the largest fire-proof subarea in the fire-proof subareas of the natural gas cabin in the certain place is 1296m3(180 m.times.1.8 m.times.4 m). The amount of nitrogen used for inhibiting natural gas explosion is 1109Kg, and the volume of nitrogen is 887Nm under the standard condition3. The nitrogen gas can extinguish fire and suppress explosion, so that the nitrogen gas system for extinguishing fire and the nitrogen gas system for suppressing explosion can be combined into a whole, only one set of nitrogen gas supply system is built, the larger value of the nitrogen gas storage quantity and the nitrogen gas storage quantity is measured, the nitrogen gas is used for extinguishing fire when a fire disaster occurs in the electric cabin, and the nitrogen gas is used for suppressing natural gas explosion when natural gas leakage occurs in the natural gas cabin.
The nitrogen fire-extinguishing system conveying and spraying control process is explained as follows:
the nitrogen gas that gas storage system discharged out inserts underground pipe gallery natural gas cabin through a trunk line, connects out a nitrogen gas lateral conduit from the nitrogen gas trunk line in every natural gas cabin fire prevention subregion, and a stop valve and a pneumatic trip valve are established to the branch pipeline starting point department. The stop valve is normally open, and the pneumatic stop valve is normally closed. When a combustible gas detection system in a certain fireproof subarea of the natural gas cabin detects that natural gas exists, an alarm signal is sent out, when the concentration of the natural gas rises to 20% of the explosion lower limit value (volume fraction), a ventilator in the natural gas cabin is started to ventilate, when the concentration of the natural gas rises to 80% of the explosion lower limit value (volume fraction), the ventilator is stopped, then a control system sends out a spraying signal to open a pneumatic stop valve in the fireproof subarea of the natural gas cabin, and nitrogen is sprayed into the natural gas cabin.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features and the technical inventions of the present invention, the technical features and the technical inventions, and the technical inventions can be freely combined and used.
Claims (10)
1. The utility model provides an adopt nitrogen gas to carry out safety protection's city utility tunnel system, a serial communication port, the city utility tunnel system that adopts nitrogen gas to carry out safety protection is equipped with nitrogen gas control valve including nitrogen gas air feeder (10), nitrogen gas pipeline (20) and utility tunnel (30) that connect gradually on nitrogen gas pipeline (20), and nitrogen gas pipeline (20) can carry the nitrogen gas in nitrogen gas air feeder (10) to in utility tunnel (30).
2. The city utility tunnel system adopting nitrogen for safety protection according to claim 1, characterized in that the utility tunnel (30) comprises an electric cabin (31) and a gas cabin (32), the nitrogen gas delivery pipe (20) is connected with the electric cabin (31) and the gas cabin (32), and the nitrogen gas delivery pipe (20) can deliver the nitrogen gas in the nitrogen gas supply device (10) to the electric cabin (31) and the gas cabin (32) of the utility tunnel (30).
3. The city underground comprehensive pipe gallery system adopting nitrogen for safety protection as claimed in claim 2, wherein the nitrogen gas supply device (10) comprises one or more of a gas cylinder gas supply system (11), a nitrogen generator set gas supply system (12) and a liquid nitrogen storage tank gas supply system (13).
4. The city underground utility tunnel system adopting nitrogen gas for safety protection as claimed in claim 3, wherein the gas cylinder gas supply system (11) comprises a nitrogen gas steel cylinder and a gas cylinder packaging grid, and the nitrogen gas steel cylinder is arranged in the gas cylinder packaging grid.
5. The city underground utility tunnel system adopting nitrogen gas for safety protection according to claim 3, characterized in that the nitrogen making unit gas supply system (12) comprises a nitrogen making unit, a supercharger and a nitrogen gas storage tank which are connected in sequence.
6. The city underground comprehensive pipe gallery system adopting nitrogen for safety protection as claimed in claim 3, wherein the liquid nitrogen storage tank gas supply system (13) comprises a liquid nitrogen storage tank, a liquid nitrogen pump, an air temperature type gasifier and a nitrogen gas storage tank which are connected in sequence.
7. The urban underground pipe gallery system adopting nitrogen for safety protection according to claim 2, wherein the nitrogen conveying pipeline (20) comprises a main nitrogen conveying pipeline (21), branch electric cabin nitrogen conveying pipelines (22) and branch gas cabin nitrogen conveying pipelines (23) which are sequentially connected, the underground pipe gallery (30) comprises a plurality of protection zones along the length direction of the underground pipe gallery (30), the branch electric cabin nitrogen conveying pipelines (22) are connected with the electric cabins (31) in the protection zones in a one-to-one correspondence manner, and the branch gas cabin nitrogen conveying pipelines (23) are connected with the gas cabins (32) in the protection zones in a one-to-one correspondence manner.
8. The city underground utility tunnel system adopting nitrogen for safety protection according to claim 7, wherein the nitrogen control valve is arranged on the electric cabin nitrogen conveying branch pipeline (22) and the gas cabin nitrogen conveying branch pipeline (23), the nitrogen control valve comprises a stop valve (25) and a pneumatic cut-off valve (24), the stop valve (25) and the pneumatic cut-off valve (24), the stop valve (25) is in a normally open state, and the pneumatic cut-off valve (24) is in a normally closed state.
9. The city utility tunnel system adopting nitrogen for safety protection according to claim 8, further comprising a control unit and a first detection unit, wherein the first detection unit is disposed in the electric cabin (31), the pneumatic cut-off valve (24) is connected with the control unit, the first detection unit is connected with the control unit, when the first detection unit detects a fire in the electric cabin (31), the control unit sends an opening signal to the pneumatic cut-off valve (24) on the electric cabin nitrogen delivery branch pipeline (22) after a delay of 30 seconds, and the pneumatic cut-off valve (24) on the electric cabin nitrogen delivery branch pipeline (22) is opened and makes the electric cabin nitrogen delivery branch pipeline (22) discharge nitrogen for 60 seconds.
10. The city underground utility tunnel system adopting nitrogen for safety protection according to claim 8, further comprising a control unit and a second detection unit, wherein the second detection unit is arranged in the gas cabin (32), the pneumatic cut-off valve (24) is connected with the control unit, the second detection unit is connected with the control unit, and when the second detection unit detects that natural gas exists in the gas cabin (32) and the concentration of the natural gas rises to 20% of the lower explosion limit value, the control unit starts a ventilator in the gas cabin (32); when the second detection unit detects that natural gas exists in the gas cabin (32) and the concentration of the natural gas rises to 80% of the lower explosion limit value, the control unit sends an opening signal to a pneumatic stop valve (24) on the gas cabin nitrogen conveying branch pipeline (23), and the pneumatic stop valve (24) on the gas cabin nitrogen conveying branch pipeline (23) is opened to enable the gas cabin nitrogen conveying branch pipeline (23) to continuously spray nitrogen.
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| CN201811404156.0A CN111214784A (en) | 2018-11-23 | 2018-11-23 | Adopt nitrogen gas to carry out safety protection's city utility tunnel system |
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| CN201811404156.0A CN111214784A (en) | 2018-11-23 | 2018-11-23 | Adopt nitrogen gas to carry out safety protection's city utility tunnel system |
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