CN103074136A - System and process method for producing natural gas by beer biogas - Google Patents
System and process method for producing natural gas by beer biogas Download PDFInfo
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- CN103074136A CN103074136A CN2013100157516A CN201310015751A CN103074136A CN 103074136 A CN103074136 A CN 103074136A CN 2013100157516 A CN2013100157516 A CN 2013100157516A CN 201310015751 A CN201310015751 A CN 201310015751A CN 103074136 A CN103074136 A CN 103074136A
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Abstract
The invention discloses a system and a process method for producing natural gas by beer biogas. The system comprises a biogas producing and centralized conveying unit, a biogas purifying unit and a biogas regulating and controlling unit which are sequentially connected through a biogas pipeline, wherein the biogas producing and centralized conveying unit comprises an anaerobic reaction tank, a water sealing device, a biogas buffer tank, a double-film biogas storage tank and a biogas pressurizing device; biogas is conveyed into a dewatering device, a dry desulfurizing tower and a filter of the biogas purifying unit through the biogas pressurizing device; after purification, the biogas enters a pressure-regulating and measuring device and a mixing device of the biogas regulating and controlling unit; the biogas regulating and controlling unit is also provided with a biogas heat value regulating and controlling device and a safety interlocking protection device; and through tests, qualified biogas is conveyed into a natural gas supplying pipe network. Through the system and the process method, the problem of biogas pollution during beer production can be solved easily, the COD content and the BOD content in wastewater are reduced, the productive potential of the biogas in a beer wastewater treatment link is fully explored, and a zero discharge aim of exhaust gas is achieved.
Description
Technical field
The present invention relates to a kind of system and processing method of utilizing beer biogas production Sweet natural gas.
Background technology
At present, the annual production of China's beer is nearly 4,000 ten thousand tons.In the production process of beer, can produce and contain in a large number organic trade effluent, average every production 1 kilolitre beer will produce nearly 5 tons waste water, these waste water mainly contain the organism such as carbohydrate and alcohols, organic concentration is higher, nontoxic, can consume a large amount of dissolved oxygens but enter water body, to the water body environment harm.So necessary through sewage disposal before discharging, and can produce a large amount of biogas in the anaerobic treatment stage for the treatment of station.
With southern process for beer production, every production 1t beer can be produced biogas 2.0～2.4m
3Calculate that by this biogas output of China Resources snowflake company every day is approximately 2000～3000m
3/ day.Processing mode for biogas has two kinds of situations at present: when output is large by emptying behind the torch burning (being commonly called as a sky lamp); Output hour then directly emptying.Directly burning not only causes huge energy dissipation, and the SO that produces behind the biogas combustion without the desulfurization processing
2Air has also been caused pollution.Methane in the biogas is strong greenhouse gases, and the Greenhouse effect of generation are 21 times of carbonic acid gas.State Environmental Protection Administration and national quality supervising and quarantining general bureau once united and had issued " brewing industry pollutant emission standard ", required each enterprise to walk with the efficient utilization of resource and were recycling as core; Take " minimizing, recycling, resource utilization " as principle, the Road of Cyclic Economy take low consumption, low emission, high-level efficiency as essential characteristic accomplishes that the optimum sustainable development pattern that the energy uses minimumization, minimizing costs, production to clean is pendulum the most urgent problem in face of China's beer industry.Thereby, select a kind of environmentally friendlyly, can be very important to the treatment process that enterprise creates maximum return again simultaneously.
Alcohol waste water generates to process through anaerobism and produces biogas, and its composition is: methane 40～60%, carbonic acid gas 40～60%, hydrogen sulfide 75～150mg/m
3, Sweet natural gas by national standard (GB17820) two class gas standards is: methane 〉=97%, carbonic acid gas≤3%, hydrogen sulfide≤20mg/m
3, total sulfur≤200mg/m
3Also there is not at present the complete concrete methods of realizing that is become Sweet natural gas by marsh gas purifying.
Summary of the invention
In order to overcome the weak point of the prior art of above-mentioned indication, the invention provides a kind of system and processing method of utilizing beer biogas production Sweet natural gas, to solve the biogas pollution problem in the beer production, reduce the content of COD, BOD in the sewage, fully excavate the biogas production capacity potentiality of beer sewage processing links.
The present invention is achieved by the following technical solutions:
A kind of system that utilizes beer biogas production Sweet natural gas comprises the biogas production and the defeated unit of collection, marsh gas purifying unit and biogas regulation and control unit of utilizing methane pipeline to connect successively.Described biogas production comprises anaerobic reation pool, liquid packing, biogas surge tank, two film biogas storage tank and the biogas pressurizing device that is connected successively with the defeated unit of collection; Biogas is delivered to successively dewatering unit, dry-type desulfurizing tower and the strainer of marsh gas purifying unit by the biogas pressurizing device; Biogas regulation and control unit comprises continuous pressure regulation and measuring apparatus and blending device, and blending device is for being used for mixing the static mixer of biogas and Sweet natural gas, and described biogas regulation and control unit also arranges calorific value regulation device and the safety interlock protector of biogas; Biogas regulation and control unit leads to the natural gas supply pipe network.
Described safety interlock protector comprises the electric-controlled switch valve under pressure monitoring device, gas flow monitoring device and the control of PLC system.
Described dry-type desulfurizing tower outlet is equipped with hydrogen sulfide content detector, methane content detector and oxygen content detector.
Establish biogas between described biogas surge tank and the two film biogas storage tank and diffuse the burning torch.
Described biogas production is controlled by the PLC system automatically with the biogas pressurizing device of the defeated unit of collection, comprises the pressure unit and the biogas roots blower that are arranged on the methane pipeline.
The invention also discloses a kind of processing method of utilizing beer biogas production Sweet natural gas based on said system, its step comprises:
(1) utilizes Anaerobic Microbiological Treatment Technology to decompose organic waste water in the beer production, produce biogas;
(2) described biogas enters after water seal in two film biogas storage tanks and stores, and the pressure in two film biogas storage tanks remains 1.0～4.0KPa;
(3) biogas is forced into 10～40KPa, successively is transported to dewatering unit and dry-type desulfurizing tower and carries out purifying treatment, then detect the biogas composition, when hydrogen sulfide content greater than 15mg/m
3, or the oxygen volume content is greater than 1% the time, or the methane volume content sends guard signal less than 50% the time, the gas after the desulfurization is by the grit of strainer elimination particle diameter greater than 10um;
(4) the described biogas that has purified enters through pressure regulation and measuring apparatus and is delivered to the natural gas supply pipe network after blending device and Sweet natural gas fully are mixed into finished product gas, and the pressure by regulating biogas and the mixed volume ratio of flow control biogas and Sweet natural gas are 1:(2～3).
Further, finished product gas transfer pressure is controlled at below the 0.4MPa described in the step (4), and the low heat value of finished product gas is greater than 31.4MJ/m
3
Further, described step (3) is after detecting the biogas off analysis and sending guard signal, and the electric-controlled switch valve in the PLC system pilot piping makes biogas stop to enter next step, and biogas is led to biogas diffuses the burning torch and light.
Further, the charcoal absorption doctor treatment is adopted in the desulfurization of described biogas.
Compared with prior art, the present invention is conducive to solve the biogas pollution problem in the beer production, reduces the content of COD, BOD in the sewage, fully excavates the biogas production capacity potentiality of beer sewage processing links and realizes the target of waste gas " zero release "; With the biogas after the purifying treatment with enter city natural gas pipe network after Sweet natural gas mixes, improve efficiency of combustion; For the calorific value of guaranteeing gas mixture meets the requirements, system is provided with the calorific value detector, and the Real Time Monitoring calorific value is also adopted an effective measure, and guarantees that calorific value is up to standard, and burning performance parameter meets the requirements.In addition, also be provided with safety interlock protector, guarantee that whole system moves under safe and reliable condition.
Description of drawings
Accompanying drawing 1 is the system schematic of utilizing beer biogas production Sweet natural gas of the present invention.
Embodiment
For the ease of those skilled in the art's understanding, the invention will be further described below in conjunction with accompanying drawing.
A kind of system that utilizes beer biogas production Sweet natural gas as shown in Figure 1, comprises the biogas production and the defeated unit of collection, marsh gas purifying unit and biogas regulation and control unit of utilizing methane pipeline to connect successively.Described biogas production comprises anaerobic reation pool, liquid packing, biogas surge tank, two film biogas storage tank and the biogas pressurizing device that is connected successively with the defeated unit of collection; Biogas is delivered to successively dewatering unit, dry-type desulfurizing tower and the strainer of marsh gas purifying unit by the biogas pressurizing device; Biogas regulation and control unit comprises continuous pressure regulation and measuring apparatus and blending device, and this biogas regulation and control unit also arranges calorific value regulation device and the safety interlock protector of biogas; Qualified biogas is delivered to the natural gas supply pipe network after testing.
Further, described biogas production is controlled by the PLC system automatically with the biogas pressurizing device of the defeated unit of collection, be included in the pressure unit that arranges on the methane pipeline and biogas roots blower (one open one standby, switched once in per 12 hours, finished by the automatic control of PLC system, at methane pipeline pressure unit is set, pressure unit issues a signal to the frequency transformer of biogas roots blower, according to pressure unit frequency change control biogas roots blower rotating speed, thereby realization is to the control of biogas flow).
Further, establish biogas between described biogas surge tank and the two film biogas storage tank and diffuse the burning torch.It is temporary to enter two film biogas storage tanks when gas is many in the pipeline, and gas can out replenish from two film biogas storage tanks when gas in the pipeline is not enough, and the pressure in two film biogas storage tanks is 1.0～4.0KPa, and the biogas amount surpasses its volume 200 m
3The time, can automatic vent emptying.
Further, described blending device comprises for the static mixer that mixes biogas and Sweet natural gas.Static mixer is a kind of high-efficiency mixing device that does not have moving parts, and its groundwork mechanism is to utilize the flow state of mixed cell structural reform fluid in pipe that is fixed in the pipe, to reach good distribution and well-mixed purpose between the different fluid.
Further; hydrogen sulfide content detector, methane content detector and oxygen content detector are established in the outlet of described dry-type desulfurizing tower, and described safety interlock protector comprises is located at electric-controlled switch valve on the pipeline, reducing valve, under meter, reverse flow valve etc. under pressure monitoring device, gas flow monitoring device and the control of PLC system.
The invention also discloses a kind of processing method of utilizing beer biogas production Sweet natural gas based on said system, its step comprises:
(1) utilizes Anaerobic Microbiological Treatment Technology to decompose organic waste water in the beer production, produce biogas;
(2) described biogas enters after water seal in two film biogas storage tanks and stores, and the pressure in two film biogas storage tanks remains 1.0～4.0KPa;
(3) biogas is forced into 10～40KPa, successively is transported to dewatering unit and dry-type desulfurizing tower and carries out purifying treatment, then detect the biogas composition, when hydrogen sulfide content greater than 15 mg/m
3, or the oxygen volume content is greater than 1% the time, or the methane volume content sends guard signal less than 50% the time, the gas after the desulfurization is by the grit of strainer elimination particle diameter greater than 10um;
(4) the described biogas that has purified enters through pressure regulation and measuring apparatus and is delivered to the natural gas supply pipe network after blending device and Sweet natural gas fully are mixed into finished product gas, and the pressure by regulating biogas and the flow control mixed volume ratio of biogas and Sweet natural gas under 0 ℃, 0.1MPa is 1:(2～3).
Particularly, the processing method of utilizing beer biogas production Sweet natural gas of one embodiment of the invention comprises following link:
One, the defeated link of biogas production and collection.Anaerobic Microbiological Treatment Technology is under anaerobic, and amphimicrobian and anaerobion colony are converted into the process of methane and carbon dioxide with organism, are called again anaerobic digestion, for the prior art of widespread use, further do not give unnecessary details at this.The biogas that the Sewage treatment systems anaerobic pond produces is delivered to the biogas surge tank through pipe special, and the existing storage tank appropriate reconstruction of surge tank utilization forms.Biogas enters two film biogas storage tank stores again through water seal afterwards, and biogas pressure remains at 3.0KPa by means of explosion-proof gas blower in the storage tank.Two film biogas tankages are 300m
3Two film biogas storage tank external forms are 3/4 spheroid, are fixed on cement pedestal or the anaerobic jar tank deck by rail.Main body is made by special processed polyesters material (main component is PVDF-polyvinylidene difluoride (PVDF) and special protection against corrosion prescription), cabinet is comprised of adventitia, inner membrance, counterdie (Over-The-Counter) and auxiliary facility, ability with uvioresistant and various microorganisms, highly fire prevention.Form the airtight space of a volume-variable between inner membrance and the counterdie (Over-The-Counter) as storing biogas, adventitia consists of the spherical external form of storage cabinet.Utilize adventitia air inlet gas blower constant voltage, when inner membrance biogas tolerance reduces, adventitia is by the gas blower air inlet, the design pressure that keeps inner membrance biogas, when biogas tolerance increases, inner membrance is normally upheld, and with the unnecessary Bas Discharged of adventitia, makes all the time constant design pressure at needs of tank internal pressure by safety valve.
Two, marsh gas purifying processing links.The combustion gas pipe special of the biogas that is forced into 20KPa by the DN150mm bore enters dewatering unit and carries out preliminary hydro-extraction, make the requirement of the water satisfied subsequent processing desulfurizer in the biogas, described dewatering unit is the gas-liquid separator of the gravity settling separation structure of the cold partition method of employing, biogas temperature high, middle temperature is lowered the temperature, adopt gravity method, the part water vapor in the biogas is removed.Desulfurizer adopts dry desulfurizing process, major equipment is the smart thionizer of 2 parallel connections, adopt one to open a standby operational mode, thionizer is cylindrical, and vertical installation is of a size of Φ 1500 * 4000mm, carbon steel structure, in-built sweetening agent can be selected cheap ferric oxide wood chip sweetening agent, and shortcoming is that discarded sweetening agent intractability is larger.Also can adopt the charcoal absorption doctor treatment, adopt environment-friendly type technique, not produce secondary pollution, have the superiority of large gas zero.Compare with other doctor treatments, activated carbon method does not have desuifurized, and its special-purpose activated charcoal has long-term catalysed oxidn, and disposable input can be used more than 4 years.Desulfurization degree reaches more than 95%.The sulfuric acid of output can directly be used to produce byproduct after the desulfurization, effective recycling the sulphur resource.
Preferably, before entering next link, to the pressurize secondary dehydration of rear cooling of biogas, biogas is forced into 0.8～1.0MPa, the cooling system of biogas pressurizing device is comprised of cooling tower, cooling water circulating pump, biogas after the pressurization enters in the high-pressure gas-liquid separator, isolates liquid condensed water.
Three, the regulation and control of biogas calorific value and the link that is mixed.Biogas after the purification is continued to be fed into next process-calorific value regulation and control and is mixed link.At first, purifying marsh gas is through pressure regulating metering device, enter again the mixing system take SV type static mixer as representative, biogas is fully mixed with Sweet natural gas, avoid the inhomogeneous situation of component to occur, by regulating pressure and the flow of biogas, be controlled at that the mixed volume ratio of biogas and Sweet natural gas is 1:2.3 under 0 ℃, 0.1MPa, the mixed gas of guaranteeing " LNG+ biogas " gained is the product that meets national standard fully, and security is protected.For guaranteeing that calorific value meets the requirements, system is provided with the heat vale of mixture detector, and the Real Time Monitoring calorific value is also adopted an effective measure, and guarantees that calorific value is up to standard, and burning performance parameter meets the requirements.In addition, also be provided with safe cross-linked protective system, guarantee that whole system moves under safe and reliable condition.Described finished product gas transfer pressure is controlled at below the 0.4MPa, and the low heat value of control finished product gas is greater than 31.4MJ/m
3
The biogas that the Sewage treatment systems anaerobic pond produces, deliver to the biogas surge tank through water-sealed tank respectively, the original torch of biogas surge tank diffuses, then pressurization successively enters gas-liquid separator, dry-type desulfurizing tower (one open one standby) through the biogas roots blower, gas after the desulfurization (is installed H2S detector, when system detects hydrogen sulfide content greater than 15 mg/m by entering the Marsh gas compression machine behind the grit of strainer elimination particle diameter greater than 10um again on the gas piping behind the strainer
3The time, sending guard signal by the PLC system, the manual thionizer that switches switches once approximately half a year, and when sending guard signal, control electric-controlled switch valve opens and closes and makes biogas stop to enter next step, and biogas is led to biogas diffuses the burning torch and light.Measure its methane and oxygen level through methane detector, oxygen detection instrument.When system detects the methane volume content less than 50% the time, send guard signal by the PLC system, control electric-controlled switch valve opens and closes and makes biogas stop to enter next step, and biogas is led to biogas diffuses the burning torch and light.When system detects the oxygen volume content greater than 1% the time, send guard signal by the PLC system, control electric-controlled switch valve opens and closes and makes biogas stop to enter next step, and biogas is led to biogas diffuses the burning torch and light.
The purifying treatment of biogas at first enters desulfurizer and carries out desulfurization, removes organosulfur and inorganic sulfur in the biogas, comprises hydrogen sulfide, then enters in the dewatering unit and dewaters, the calorific value of corresponding raising biogas.Remove the biogas of sulphur and water, continue to be fed into again next processing links, by the induction apparatus blending, pressure regulation metering, the calorific value regulation and control, the burning performance parameter allotment, proximate analysis and monitoring, indices all meets " national standard " " Code for design of city gas engineering " (GB50028-2006), " city gas technical specifications " (GB50494-2009) " general characteristic of Sweet natural gas " (GB/T 19204-2003), " city gas classification and combustioncharacteristics " product (GB16121-2008), satisfying permissible velocity and do not forming under the prerequisite of explosion gases, enter the natural gas medium-pressure pipe network, evenly be mixed rear for the user with Sweet natural gas in the pipeline.But mixed product does not enter the pipe network with CNG Vehicle Fueling Station user.
Above content is the further description of the present invention being done in conjunction with concrete optimal way, should not assert that implementation of the present invention is confined to above explanation.For those skilled in the art, without departing from the inventive concept of the premise, can also make some simple deduction or replace, within the protection domain that the claim that all should be considered as being submitted to by the present invention is determined.
Claims (10)
1. system that utilizes beer biogas production Sweet natural gas, comprise the biogas production and the defeated unit of collection, marsh gas purifying unit and biogas regulation and control unit of utilizing methane pipeline to connect successively, it is characterized in that: described biogas production comprises anaerobic reation pool, liquid packing, biogas surge tank, two film biogas storage tank and the biogas pressurizing device that is connected successively with the defeated unit of collection; Biogas is delivered to successively dewatering unit, dry-type desulfurizing tower and the strainer of marsh gas purifying unit by the biogas pressurizing device; Biogas regulation and control unit comprises continuous pressure regulation and measuring apparatus and blending device, and blending device is a static mixer for mixing biogas and Sweet natural gas, and described biogas regulation and control unit also arranges calorific value regulation device and the safety interlock protector of biogas; Biogas regulation and control unit leads to the natural gas supply pipe network.
2. the system that utilizes beer biogas production Sweet natural gas according to claim 1 is characterized in that: described safety interlock protector comprises the electric-controlled switch valve under pressure monitoring device, gas flow monitoring device and the control of PLC system.
3. the system that utilizes beer biogas production Sweet natural gas according to claim 2 is characterized in that: described dry-type desulfurizing tower outlet is equipped with hydrogen sulfide content detector, methane content detector and oxygen content detector.
4. the system that utilizes beer biogas production Sweet natural gas according to claim 3 is characterized in that: establish biogas between described biogas surge tank and the two film biogas storage tank and diffuse the burning torch.
5. the system that utilizes beer biogas production Sweet natural gas according to claim 4, it is characterized in that: described biogas production is controlled by the PLC system automatically with the biogas pressurizing device of the defeated unit of collection, comprises the pressure unit and the biogas roots blower that are arranged on the methane pipeline.
6. processing method of utilizing beer biogas production Sweet natural gas based on each described system in the claim 1～5, its step comprises:
(1) utilizes Anaerobic Microbiological Treatment Technology to decompose organic waste water in the beer production, produce biogas;
(2) described biogas enters after water seal in two film biogas storage tanks and stores, and the pressure in two film biogas storage tanks remains 1.0～4.0KPa;
(3) biogas is forced into 10～40KPa, successively is transported to dewatering unit and dry-type desulfurizing tower and carries out purifying treatment, then detect the biogas composition, when hydrogen sulfide content greater than 15 mg/m
3, or the oxygen volume content is greater than 1% the time, or the methane volume content sends guard signal less than 50% the time, the biogas after the desulfurization is by the grit of strainer elimination particle diameter greater than 10um;
(4) the described biogas that has purified enters through pressure regulation and measuring apparatus and is delivered to the natural gas supply pipe network after blending device and Sweet natural gas fully are mixed into finished product gas, and the pressure by regulating biogas and the mixed volume ratio of flow control biogas and Sweet natural gas are 1:(2～3).
7. the method for utilizing beer biogas production Sweet natural gas according to claim 6, it is characterized in that: described step (3) is after detection biogas off analysis sends guard signal, electric-controlled switch valve in the PLC system pilot piping makes biogas stop to enter next step, and with biogas lead to biogas diffuse the burning torch light.
8. the method for utilizing beer biogas production Sweet natural gas according to claim 7, it is characterized in that: finished product gas transfer pressure is controlled at below the 0.4MPa described in the step (4), and the high heating value of finished product gas is greater than 31.4MJ/m
3
9. the method for utilizing beer biogas production Sweet natural gas according to claim 8 is characterized in that: described dewatering unit is the gas-liquid separator based on the gravity settling separation structure of cold partition method.
10. the method for utilizing beer biogas production Sweet natural gas according to claim 8 is characterized in that: the desulfurization employing charcoal absorption doctor treatment of described biogas.
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Application publication date: 20130501 |