CN102563285B - Maintenance efficiency improving method for centralized heating system - Google Patents
Maintenance efficiency improving method for centralized heating system Download PDFInfo
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- CN102563285B CN102563285B CN201210010319.3A CN201210010319A CN102563285B CN 102563285 B CN102563285 B CN 102563285B CN 201210010319 A CN201210010319 A CN 201210010319A CN 102563285 B CN102563285 B CN 102563285B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The invention relates to a maintenance efficiency improving method for a centralized heating system. In a non-heating period, an oxygen-free gas generating device is used for preparing oxygen-free gas, and the prepared oxygen-free gas is filled into a pipe network of the heating system to perform oxygen-free maintenance, so that oxidation corrosion in the pipe network is prevented. The oxygen-free gas generating device is preferably a nitrogen generating device using air as raw materials, the oxygen-free gas generated by the oxygen-free gas generating device is connected with the heating system through an oxygen-free gas supply pipeline, all the internal space of the heating system needing oxygen-free maintenance is filled with the oxygen-free gas and is in a non-pressure or positive-pressure state, and oxygen-enriched gas generated by the oxygen-free gas generating device is delivered into a gas storage device and delivered into a boiler under proper pressure and flow in operation of the boiler through the gas storage device. The maintenance efficiency improving method can be used for effectively decreasing oxidation corrosion of the pipe network of the heating system in non-heating seasons, can be used for effectively improving the combustion efficiency and power consumption of the boiler, and is mainly adaptable to centralized heating systems on various scales.
Description
Technical field
The present invention relates to a kind of maintenance for central heating system and put forward efficacious prescriptions method, be mainly adapted to the central heating system of various scales, be also adapted to other relevant occasions.
Background technique
Central heat supply is that modern city must obligato Infrastructure, also be the important component part of urban public utilities, heating system comprises for the boiler of the heat production of burning and for delivery of the heating network of steam or water, described heating network generally includes with boiler and forms a pipe network of circulation and form with heat collector or other secondary pipe network circulating with hot equipment, medium in a pipe network and the medium in secondary pipe network carry out heat exchange at heat exchanger, to heat energy is sent to secondary pipe network, according to the conversion of each department weather, before and after annual winter, it is Heating Season, by heating system to user's heat supply, stop heat supply at non-heating season.
The central heat supply cause of China has had larger development, has not only accumulated rich experience at aspects such as design, construction, operation managements, and has also had larger progress at aspects such as equipment, instrument and apparatus, materials.But, existing central heating system also exists many deficiencies, as high in heating system energy consumption, efficiency is low, lack effective maintenance and make pipe network facilities (various pipelines and the equipment etc. of general reference formation medium circulation passage, lower same) working life is short, operation maintenance amount is large, how to maintain the outstanding problem of putting forward effect.
Owing to lacking effective maintenance and putting forward efficacious prescriptions method, conventionally at non-heating period, the pipe network facilities of existing central heating system is far from being maintenance substantially, stop often after heating, the water that whole pipe network facilities is retained is because the existence meeting of pipe network facilities leakage point is flowed only very soon, cause the fast full whole pipe network facilities of air, like this at the non-heating period of seven or eight months, each pipeline inner wall of whole pipe network facilities is because the oxidation of air produces more serious oxide etch, and can be gradually heavy year by year, greatly reduce the operation working life of central heating system pipe network facilities, and at heating period, each energy consumption equipment of existing central heating system, fuel, as blower fan, fire coal etc., be to use in the rated efficiency of each equipment and operation below the combustion efficiency of fuel substantially, the thermal efficiency of heat source is lower, and energy consumption is higher.
Summary of the invention
For overcoming the above-mentioned defect of prior art, the invention provides a kind of maintenance for central heating system and put forward efficacious prescriptions method, adopt and can effectively reduce in this way the pipe network facilities of heating system in the oxide etch of non-heating season, and can effectively improve the combustion efficiency of boiler, reduce power consumption.
The technical solution adopted in the present invention is:
Put forward an efficacious prescriptions method for the maintenance of central heating system, it is between non-heating period, and oxygenless gas prepared by oxygenless gas generating means is filled with in the pipe network facilities of described heating system and carries out oxygenless gas maintenance, to prevent the oxide etch in described pipe network facilities.
The oxygenless gas outlet of described oxygenless gas generating means can connect described heating system by oxygenless gas steam line, is filled with described oxygenless gas thus in described heating system.
Whole spaces that described oxygenless gas should be full of described heating system inside conventionally need to carry out oxygenless gas maintenance, and the oxygenless gas in described heating system preferably (refers to relative pressure in no pressure or barotropic state, lower same), to avoid the outside oxygen air that contains to enter heating system.
Described oxygenless gas maintenance can adopt the mode of open inflation maintenance.
For example, described heating system is provided with oxygenless gas suction port for being filled with described oxygenless gas and for discharging the oxygenless gas relief opening of described oxygenless gas, the oxygenless gas outlet of described oxygenless gas generating means connects the oxygenless gas suction port in described heating system by described oxygenless gas steam line, described oxygenless gas relief opening is communicated with atmosphere environment, described oxygenless gas suction port to the oxygenless gas passage (being the oxygenless gas passage in described heating system) of described oxygenless gas relief opening has comprised the whole spaces that need to carry out oxygenless gas maintenance in described heating system.
The quantity of described oxygenless gas suction port and described oxygenless gas relief opening can be respectively one or more, easy with the practical structures feature according to heating network, to build reliably described oxygenless gas circulation path.
Described oxygenless gas relief opening is preferably provided with control valve, to control and to regulate the oxygenless gas pressure in discharge and the described heating system of oxygenless gas.
Described oxygenless gas maintenance also can adopt the mode of circulating inflation maintenance.
For example, described heating system is provided with oxygenless gas suction port for inputting described oxygenless gas and for discharging the oxygenless gas relief opening of described oxygenless gas, the oxygenless gas outlet of described oxygenless gas generating means accesses the oxygenless gas suction port in described heating system by described oxygenless gas steam line, described oxygenless gas relief opening connects the gas inlet of described oxygenless gas generating means by oxygenless gas return-air duct, described oxygenless gas suction port to the gas channel of described oxygenless gas relief opening has comprised the whole spaces that need to carry out oxygenless gas maintenance in described heating system.
For above-mentioned various situations, the relative pressure of the oxygenless gas in described heating system is preferably 0-700kPa, and oxygen content is preferably 0.01-5%.
Can carry out supercharging to described oxygenless gas by blower fan being set on described oxygenless gas steam line, to meet the pressure requirement of described oxygenless gas in described heating system.
For above-mentioned various situations, described oxygenless gas generating means is preferably the nitrogen gas generating device of preparing nitrogen taking air as virgin gas conventionally, and its by-product is oxygen-rich gas.
Described oxygen-rich gas can be sent into oxygen-rich gas caisson, described oxygen-rich gas caisson is provided with oxygen-rich gas air supply opening, described oxygen-rich gas air supply opening connects the intake grill of the boiler of described heating system, to described oxygen-rich gas is sent into boiler auxiliary combustion according to boiler characteristics in suitable mode (flow, pressure etc.) at Heating Season.
The supply gas pressure of described oxygen-rich gas air supply opening is preferably 0.1-5kPa, and taking the pressure that do not affect flue gas flow rate in described boiler as optimum pressure value.
The oxygen content of described oxygen-rich gas is preferably 30-50%, and to improve oxygen content that coal fuel heating efficiency is higher as best oxygen content value.
The flow of described oxygen-rich gas is preferably 1-15 Nm
3/ min, and not affect flue gas flow rate in the boiler of carried oxygen-rich gas and to improve flow that coal fuel heating efficiency is higher as optimum flow value.
For above-mentioned various situations, the ducted pipeline junction that relates to oxygenless gas maintenance in pipeline junction in described oxygenless gas steam line and/or described heating system should be provided with seal ring conventionally, the preferred modified rubber seal ring of described seal ring, to improve sealability, reduce the consumption of described oxygenless gas.
The invention has the beneficial effects as follows: carry out oxygenless gas maintenance owing to oxygenless gas being filled with at non-heating season in the pipe network facilities of described heating system, effectively avoid the oxide etch of air to pipe network facilities, therefore can improve significantly the working life of pipe network facilities; Owing to can adopting the nitrogen gas generating device taking air as raw material to produce described oxygenless gas, airborne nitrogen content is high in addition, and preparation cost is low, therefore can effectively reduce the cost of pipe network facilities oxygenless gas maintenance; Owing to can adopting open and circulating two kinds of different maintenance modes, therefore can be suitable for the actual conditions of various heating systems; Owing to can carrying out by control valve the control of oxygenless gas pressure in emission flow and pipe network, with no pressure or malleation in selected optimum range, and can adopt according to actual needs the working method of clearance type, therefore can, in ensureing oxygenless gas maintenance effect, reduce as much as possible operating cost; Because the oxygen-rich gas that nitrogen gas generating device can be produced is sent into caisson, and in the time that working, boiler sends into boiler with suitable pressure and flow by caisson, can effectively improve thus the oxygen content in inlet air of boiler, contribute to improve combustion regime, improve combustion efficiency, reduce the power consumption of boiler fan, and then save the energy, minimizing pollutant emission, lower heating cost.
Through measuring and calculating, the present invention can improve pipe network facilities operation 5-10 in working life, reduces operation maintenance amount 20-40%; Reduce the load of boiler fan more than 15%, improve the combustion efficiency 10-20% of boiler fired coal.
Brief description of the drawings
Fig. 1 is a kind of system architecture schematic diagram that adopts the inventive method.
Embodiment
Below, by reference to the accompanying drawings, to how realizing method of the present invention be described further.
In the embodiment shown in fig. 1, the present invention increases oxygenless gas generating means 1 in existing heating system, taking air as raw material, be taking nitrogen as main oxygenless gas and by-product oxygen-rich gas by air separation, and in being filled with pipe network facilities by pipeline by oxygenless gas, non-heating period carries out oxygenless gas maintenance, and oxygen-rich gas can store to do his use, also can directly enter atmosphere environment and not produce any pollution.
At non-heating season, the certain purity that oxygenless gas generating means 1 produces and the oxygenless gas of pressure, by 2 fillings of oxygenless gas steam line or add to central heating system heat exchanger 5 two ends pipe network or/and secondary pipe network for water return pipeline 11 or/and in 12, comprise in the hot user's 13 of all heating the heat supplying pipeline of user's architectural complex 6 and keep certain pressure and flow.Embodiment is: stop after heating, the pipeline of central heating system pipe network facilities can have a certain amount of water, due to the complicated huge and distance of pipe network facilities of central heating system, unavoidable some pipeline has leakage point, conventionally the water in 1-2 days pipelines will leak, in pipeline, will be full of air like this, the non-heating period that malaria is very long at seven or eight months, can produce more serious tube inner corrosion and gradually heavy year by year to the pipeline of pipe network facilities, have a strong impact on operational efficiency and the working life of central heating system pipe network facilities, based on this, stopping after heating, preferably artificially by the water emptying of pipe network facilities pipeline, can certainly not carry out people is emptying, then, start oxygenless gas generating means 1, oxygenless gas generating means 1 in illustrated embodiment is preferably nitrogen production by air separation machine, nitrogen production by air separation machine enters after normal product nitrogen (can carry the nitrogen of 97% above purity), start by oxygenless gas steam line 2 to pipe network or secondary pipe network for water return pipeline 11 or 12 filling nitrogen, institute's inflated with nitrogen pressure is preferably 0-100kPa, and to ensure that ambient air can not enter pressure minimum required in the pipe network facilities pipe being maintained as optimum pressure value, normal conditions down-off is preferably 0.1-0.5Nm
3/ min, and to ensure whole pipelines of the pipe network facilities that it was maintained being filled to the required flow of described optimum pressure value as optimum flow value in 24 hours.Said process is actual is by the nitrogen of the carrying process that (when not emptying) replace that gradually air in pipe network facilities pipeline or air added water, in final pipe network facilities pipeline, be full of nitrogen, the characteristic of utilizing nitrogen to react with other material hardly, at very long non-heating period, all pipelines to pipe network facilities effectively maintain, solve the oxide etch problem in the each pipeline of non-heating period pipe network facilities, greatly improved its operation working life and efficiency.According to actual needs, described oxygenless gas generating means can clearance type work, to supplement the oxygenless gas reducing because of leakage in pipe network facilities, the pressure of oxygenless gas is remained in a suitable scope.
The maintenance of above-mentioned inflated with nitrogen can adopt openly fills nitrogen maintenance or circulatingly fills nitrogen maintenance, openly fill nitrogen maintenance and refer to: the nitrogen filling that nitrogen production by air separation machine is produced or add to after the pipe network facilities of central heating system, floss hole by the appropriate location that is arranged on pipe network facilities pipeline discharges in right amount, can effectively replace the gas in pipe network facilities pipeline to ensure filling or supplementary nitrogen, and maintaining the required flow of maintenance, described floss hole can arrange the device for controlling and regulating such as control valve; Circulatingly fill nitrogen maintenance and refer to: the nitrogen filling that nitrogen production by air separation machine is produced or add to after pipe network facilities, through being arranged on the floss hole of appropriate location of pipe network facilities pipeline, be discharged into the suction port of nitrogen production by air separation machine by oxygenless gas return-air duct 3, its discharge amount is to ensure that the required maintenance of gas that filling or supplementary nitrogen can effectively be replaced in pipe network facilities pipeline maintains flow; The present embodiment is preferably the circulating nitrogen maintenance of filling, and advantage is: because the oxygen content of the gas of the confidential separation of nitrogen production by air separation is fewer and feweri, the purity of institute's inflated with nitrogen can be more and more higher, can reach more than 99.5%, thereby further improve maintenance effect; Meanwhile, the load of nitrogen production by air separation machine is also low weight, can improve it and produce nitrogen efficiency, extends its working life.
In the appropriate location of central heating system pipe network facilities pipeline, be provided with band signal transmission or band signal transmission oxygen content detector 14 or/and pressure detector 15 or/and flow detector 16, various detectors can carry out various flexible settings according to pipe network structure, wherein oxygen content detector 14 detects the oxygen content of nitrogen in pipe network facilities pipeline in real time, pressure detector 15 detects the pressure of nitrogen in pipe network facilities pipeline in real time, and flow detector 16 detects the flow of nitrogen in pipe network facilities pipeline in real time; Above data all can teletransmission arrive control system so that monitoring in real time, and be provided with abnormal alarm function, ensure to fill the safe and effective of nitrogen maintenance, and can control the working state of described oxygenless gas generating means by control cabinet or other forms of control gear according to these signals.
Monitor particularly important to filling in pipe network facilities pipeline or supplementary nitrogen pressure effective detection in real time, the principle of controlling nitrogen pressure is: filling or supplementary nitrogen pressure are that micro positive pressure is as 5-10kPa for ensureing that ambient air can not enter required pressure minimum in maintained pipe network facilities pipe, when the pressure detecting when pressure detector 15 is less than or greater than this value, above-mentioned nitrogen production by air separation machine can automatically supplement or reduce and fill nitrogen amount to meet its pressure according to passed data.
At heating period, first by emptying the oxygenless gas in central heating system pipe network facilities pipeline, and then to its water filling to heat.When heating (when the heating boiler 8 of centralized heating boiler plant 7 moves), oxygenless gas generating means 1 is preferably nitrogen production by air separation machine, the by-product of producing is that oxygen-rich gas is at such as gas holder of oxygen-rich gas caisson 4() in pressurize storage, and by oxygen-rich gas steam line 10 to the stove combustion system of the heating boiler 8 in centralized heating boiler plant 7 or/and the air blowing opening (preferably) of heating boiler blower fan 9 carries a certain amount of oxygen-rich gas to reach efficient combustion-supporting, reduce boiler fan load, improve the object of fuel economy.According to actual needs, the oxygen-rich gas that non-heating season can be prepared stores for boiler, also can start oxygenless gas generating means 1 with the oxygen-rich gas for the preparation of boiler at Heating Season.
The actual demand feature of considering cost and appointed condition and boiler, can select the pressure of described oxygen-rich gas to be less than 100kPa, and the oxygen content of oxygen-rich gas is 25%-65%, and the flow of oxygen-rich gas is less than 60Nm
3/ min.
The pressure of above-mentioned oxygen-rich gas is preferably 0.1-5kPa, and taking the pressure that do not affect flue gas flow rate in the boiler of carried oxygen-rich gas as optimum pressure value; The oxygen content of oxygen-rich gas is preferably 30%-50%, and to improve oxygen content that coal fuel heating efficiency is higher as best oxygen content value; The flow of oxygen-rich gas is preferably 1-15 Nm
3/ min, and not affect flue gas flow rate in the boiler of carried oxygen-rich gas, and to improve the higher flow of coal fuel heating efficiency be optimum flow value; And according to the conveying oxygen-rich gas of the operating conditions timely and appropriate discovery of heating boiler 8.
For the pipeline junction of above-mentioned various pipelines and other facilities, conventionally adopt rubber seal to seal, the preferred modified rubber seal ring of described rubber seal.For improving sealing effect, the present invention also provides a kind of synthetic rubber that can be used as described modified rubber seal ring simultaneously, and its formula and preparation method are:
Raw material:
Isobutylene 100kg, purity requirement: n-butene content is lower than 0.5%;
Isoprene 3kg, purity should be higher than 98%;
Nonpolar solvent:
N-hexane, 300-1500kg, purity should be higher than 95%;
Initator:
Zinc bromide 1.5kg+ alchlor 0.85kg is dissolved in 6kg propandiol butyl ether;
Catalytic inhibitor:
Stearic acid 0.5kg+ calcium stearate 0.4kg+ white clay 0.6kg+ silicious marl 0.3kg+ polyethyleneglycol 0.25kg molten (mixing) is in 0.25kg water;
Wherein, stearic acid, calcium stearate, white clay and silicious marl are nanometer powder;
Polymerization temperature :-30 DEG C;
Preparation method:
First isobutylene and isoprene are made to hexane solution jointly; under-30 DEG C, inert gas shielding environment, add the initiator solution mixing preparing after 4-5 minute; continuing to add continuously catalytic inhibitor to reaction to finish under admixture immediately; the speed that adds of catalytic inhibitor preferably reduces gradually according to course of reaction, and the total overall reaction time can be 0.8～1 hour conventionally.
The seal ring of preparing with above-mentioned synthetic rubber, be adapted to the pipeline condition of heating system, compare with common commercially available seal ring, there is good sealability and aging quality resistance, not only long service life, can also effectively reduce the leakage of the air water (vapour) that heating system relates to, be conducive to reduce the cost of rate of water make-up, energy consumption and the oxygenless gas maintenance of heating system.
The foregoing is only a preferred embodiment of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations; Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within being all included in protection scope of the present invention.
Claims (9)
1. efficacious prescriptions method is put forward in the maintenance for central heating system, it is characterized in that between non-heating period, oxygenless gas prepared by oxygenless gas generating means is filled with in the pipe network facilities of described heating system and carries out oxygenless gas maintenance, to prevent the oxide etch in described pipe network facilities, the oxygenless gas outlet of described oxygenless gas generating means connects described heating system by oxygenless gas steam line, in described heating system, be filled with described oxygenless gas thus, described oxygen free air is nitrogen, gradually the air in pipe network facilities pipeline or air are added water and replaced with the nitrogen of carrying, in final pipe network facilities pipeline, be full of nitrogen, whole spaces that described oxygenless gas is full of described heating system inside need to carry out oxygenless gas maintenance, oxygenless gas in described heating system is in no pressure or barotropic state, to avoid the outside oxygen air that contains to enter heating system, described oxygenless gas maintenance adopts the mode of open inflation maintenance, described heating system is provided with oxygenless gas suction port for being filled with described oxygenless gas and for discharging the oxygenless gas relief opening of described oxygenless gas, the oxygenless gas outlet of described oxygenless gas generating means connects the oxygenless gas suction port in described heating system by described oxygenless gas steam line, described oxygenless gas relief opening is communicated with atmosphere environment, described oxygenless gas suction port to the oxygenless gas passage of described oxygenless gas relief opening has comprised the whole spaces that need to carry out oxygenless gas maintenance in described heating system, the ducted pipeline junction that relates to oxygenless gas maintenance in pipeline junction in described oxygenless gas steam line and/or described heating system is provided with modified rubber seal ring, to improve sealability, reduce the consumption of described oxygenless gas, elastomeric formula and preparation method as described modified rubber seal ring are:
Raw material:
Isobutylene 100kg, purity requirement: n-butene content is lower than 0.5%;
Isoprene 3kg, purity should be higher than 98%;
Nonpolar solvent:
N-hexane, 300-1500kg, purity should be higher than 95%;
Initator:
Zinc bromide 1.5kg+ alchlor 0.85kg is dissolved in 6kg propandiol butyl ether;
Catalytic inhibitor:
Stearic acid 0.5kg+ calcium stearate 0.4kg+ white clay 0.6kg+ silicious marl 0.3kg+ polyethyleneglycol 0.25kg molten (mixing) is in 0.25kg water;
Wherein, stearic acid, calcium stearate, white clay and silicious marl are nanometer powder;
Polymerization temperature :-30 DEG C;
Preparation method:
First isobutylene and isoprene are made to hexane solution jointly; under-30 DEG C, inert gas shielding environment, add the initiator solution mixing preparing after 4-5 minute; continuing to add continuously catalytic inhibitor to reaction to finish under admixture immediately; the speed that adds of catalytic inhibitor reduces gradually according to course of reaction, and the total overall reaction time is 0.8～1 hour.
2. efficacious prescriptions method is put forward in the maintenance for central heating system as claimed in claim 1, the quantity that it is characterized in that described oxygenless gas suction port and described oxygenless gas relief opening is respectively one or more, described oxygenless gas relief opening is provided with control valve, to control and to regulate the oxygenless gas pressure in discharge and the described heating system of oxygenless gas.
3. efficacious prescriptions method is put forward in the maintenance for central heating system as claimed in claim 1 or 2, it is characterized in that, by blower fan being set on described oxygenless gas steam line, described oxygenless gas is carried out to supercharging, to meet the pressure requirement of described oxygenless gas in described heating system.
4. efficacious prescriptions method is put forward in the maintenance for central heating system as claimed in claim 3, it is characterized in that described oxygenless gas generating means is the nitrogen gas generating device of preparing nitrogen taking air as virgin gas, its by-product is oxygen-rich gas, described oxygen-rich gas is sent into oxygen-rich gas caisson, described oxygen-rich gas caisson is provided with oxygen-rich gas air supply opening, and described oxygen-rich gas air supply opening connects the intake grill of the boiler of described heating system.
5. efficacious prescriptions method is put forward in the maintenance for central heating system as claimed in claim 4, the supply gas pressure that it is characterized in that described oxygen-rich gas air supply opening is 0.1-5kPa, and taking the pressure that do not affect flue gas flow rate in described boiler as optimum pressure value, the oxygen content of described oxygen-rich gas is 30-50%, and to improve oxygen content that coal fuel heating efficiency is higher as best oxygen content value; The flow of described oxygen-rich gas is 1-15 Nm
3/ min, and not affect flue gas flow rate in the boiler of carried oxygen-rich gas and to improve flow that coal fuel heating efficiency is higher as optimum flow value.
6. efficacious prescriptions method is put forward in the maintenance for central heating system, it is characterized in that between non-heating period, oxygenless gas prepared by oxygenless gas generating means is filled with in the pipe network facilities of described heating system and carries out oxygenless gas maintenance, to prevent the oxide etch in described pipe network facilities, the oxygenless gas outlet of described oxygenless gas generating means connects described heating system by oxygenless gas steam line, in described heating system, be filled with described oxygenless gas thus, described oxygen free air is nitrogen, gradually the air in pipe network facilities pipeline or air are added water and replaced with the nitrogen of carrying, in final pipe network facilities pipeline, be full of nitrogen, whole spaces that described oxygenless gas should be full of described heating system inside need to carry out oxygenless gas maintenance, oxygenless gas in described heating system is in no pressure or barotropic state, to avoid the outside oxygen air that contains to enter heating system, described oxygenless gas maintenance adopts the mode of circulating inflation maintenance, described heating system is provided with oxygenless gas suction port for inputting described oxygenless gas and for discharging the oxygenless gas relief opening of described oxygenless gas, the oxygenless gas outlet of described oxygenless gas generating means accesses the oxygenless gas suction port in described heating system by described oxygenless gas steam line, described oxygenless gas relief opening connects the gas inlet of described oxygenless gas generating means by oxygenless gas return-air duct, described oxygenless gas suction port to the gas channel of described oxygenless gas relief opening has comprised the whole spaces that need to carry out oxygenless gas maintenance in described heating system, the ducted pipeline junction that relates to oxygenless gas maintenance in pipeline junction in described oxygenless gas steam line and/or described heating system is provided with modified rubber seal ring, to improve sealability, reduce the consumption of described oxygenless gas, elastomeric formula and preparation method as described modified rubber seal ring are:
Raw material:
Isobutylene 100kg, purity requirement: n-butene content is lower than 0.5%;
Isoprene 3kg, purity should be higher than 98%;
Nonpolar solvent:
N-hexane, 300-1500kg, purity should be higher than 95%;
Initator:
Zinc bromide 1.5kg+ alchlor 0.85kg is dissolved in 6kg propandiol butyl ether;
Catalytic inhibitor:
Stearic acid 0.5kg+ calcium stearate 0.4kg+ white clay 0.6kg+ silicious marl 0.3kg+ polyethyleneglycol 0.25kg molten (mixing) is in 0.25kg water;
Wherein, stearic acid, calcium stearate, white clay and silicious marl are nanometer powder;
Polymerization temperature :-30 DEG C;
Preparation method:
First isobutylene and isoprene are made to hexane solution jointly; under-30 DEG C, inert gas shielding environment, add the initiator solution mixing preparing after 4-5 minute; continuing to add continuously catalytic inhibitor to reaction to finish under admixture immediately; the speed that adds of catalytic inhibitor reduces gradually according to course of reaction, and the total overall reaction time is 0.8～1 hour.
7. efficacious prescriptions method is put forward in the maintenance for central heating system as claimed in claim 6, it is characterized in that, by blower fan being set on described oxygenless gas steam line, described oxygenless gas is carried out to supercharging, to meet the pressure requirement of described oxygenless gas in described heating system.
8. efficacious prescriptions method is put forward in the maintenance for central heating system as claimed in claim 7, it is characterized in that described oxygenless gas generating means is the nitrogen gas generating device of preparing nitrogen taking air as virgin gas, its by-product is oxygen-rich gas, described oxygen-rich gas is sent into oxygen-rich gas caisson, described oxygen-rich gas caisson is provided with oxygen-rich gas air supply opening, and described oxygen-rich gas air supply opening connects the intake grill of the boiler of described heating system.
9. efficacious prescriptions method is put forward in the maintenance for central heating system as claimed in claim 8, the supply gas pressure that it is characterized in that described oxygen-rich gas air supply opening is 0.1-5kPa, and taking the pressure that do not affect flue gas flow rate in described boiler as optimum pressure value, the oxygen content of described oxygen-rich gas is 30-50%, and to improve oxygen content that coal fuel heating efficiency is higher as best oxygen content value; The flow of described oxygen-rich gas is 1-15 Nm
3/ min, and not affect flue gas flow rate in the boiler of carried oxygen-rich gas and to improve flow that coal fuel heating efficiency is higher as optimum flow value.
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