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CN206404566U - Heat accumulating type natural gas boiler energy-saving denitration integral system - Google Patents

Heat accumulating type natural gas boiler energy-saving denitration integral system Download PDF

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Publication number
CN206404566U
CN206404566U CN201621453497.3U CN201621453497U CN206404566U CN 206404566 U CN206404566 U CN 206404566U CN 201621453497 U CN201621453497 U CN 201621453497U CN 206404566 U CN206404566 U CN 206404566U
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China
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heat accumulating
reducing agent
accumulating type
boiler
combustion chamber
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Expired - Fee Related
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CN201621453497.3U
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Chinese (zh)
Inventor
钟贵全
王志军
王东方
郭科宏
宋敏洁
吴道洪
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Shenwu Technology Group Corp Co Ltd
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Shenwu Technology Group Corp Co Ltd
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Abstract

The utility model is related to a kind of heat accumulating type natural gas boiler energy-saving denitration integral system, including boiler body, I-tube combustion chamber, two groups of heat accumulating type neat gas burners, condensers, it uses heat accumulating type high temperature air combustion technology and SNCR and SCR combined denitration technologies, and denitrification reducing agent is sprayed using combustion chamber, reducing agent control valve interlocks action control with reversal valve, protrude energy-saving effect of the present utility model, effectively save fuel;Environment protecting is protruded, flue gas nitrogen oxide discharge capacity reduction by more than 50%;Cost-effective substantially the compact reduction of overall system architecture produces installation cost, combines the catalyst cost in out of stock technology reduction running.

Description

Heat accumulating type natural gas boiler energy-saving denitration integral system
Technical field
The utility model is related to a kind of heat accumulating type natural gas boiler energy-saving denitration integral system, belongs to Thermal Equipment, naturally Gas boiler energy-conserving and environment-protective field.
Background technology
At present, all kinds of natural gas boilers typically use smoke-fire-tube or water-tube boiler, and metal consumption is big, in order to reduce smoke evacuation temperature Degree, the substantial amounts of convection heating surface of conventional natural gas hot water's layout of boiler absorbs flue gas heat, due to natural gas have it is higher Hydrogen content, therefore in combustion product contain a large amount of vapor, when using a large amount of convection heating surfaces when, if exhaust gas temperature mistake It is low, a large amount of metal consumptive materials are not only consumed, while easily causing the tail flue gas of natural gas boiler to condense, cause corrosion to occur.This Outside, natural gas is as clean fuel, compared with other fuel, and sulfur dioxide and dust are few in its combustion product, but nitrogen oxidation Thing concentration is higher, if exhaust gas temperature is relatively low, and its flue gas removing nitrogen oxides is very difficult.Heat storage type combustion is applying low heat value Very well, but during applied to gas fuel, the reduction of nitrogen oxides in effluent just turns into one urgently to effect during coal gas fuel Improved technology.
Current low-nitrogen oxide discharging boiler combustion technology research is divided into three directions:Pretreatment to fuel and air; Air and fuel are distributed rationally and low NO design;The post processing of flue gas.For fuel and the preprocess method of air And flue gas processing method, due to system complex, investment is big, take up an area the reasons such as big, operating cost height, for relatively disperseing middle or small Type boiler is not applied to simultaneously.Low NO suppress NO_x formation while, often bring efficiency of combustion it is relatively low, burning Temperature is reduced or excess air coefficient is improved, and brings the problems such as boiler efficiency reduction and operating cost are improved.
The Chinese patent of Application No. 200810227754.5, which discloses one kind, can effectively reduce natural gas boiler metal and disappear Consume and realize the natural gas boiler system of the heat storage type combustion selective catalytic reduction flue gas denitration of flue gas removing nitrogen oxides, bag The U-tube combustion chamber that include boiler body, is built in boiler body, two respectively symmetrically be connected with U-tube burner ends Two grades of heat accumulating type neat gas burners of individual alternation, two grades of heat accumulating type neat gas burners respectively by reversal valve with it is natural Gas combustion air is connected with flue gas after burning;First order heat storage, storage are provided with two grades of heat accumulating type neat gas burners Thermocatalytic body and second level heat storage, are provided with reducing agent shower nozzle, reducing agent between first order heat storage and heat-storage catalytic body Shower nozzle is connected with reducing agent control valve, and reducing agent control valve carries out interlocked control with four-way valve, when two grades of heat accumulating type natural gas combustions When flowing through flue gas in burner, the injection of reducing agent shower nozzle, when flowing through air, it is closed.The natural gas boiler system is using selectivity Catalysis reduction, its denitration flow is short, and reducing agent mixes not abundant enough with flue gas, and denitration efficiency is relatively low and the escaping of ammonia is high;Accumulation of heat side Formula is commutated using four-way reversing valve, easily causes furnace internal pressure fluctuation big.
The Chinese patent of Application No. 201210134253.9 discloses a kind of oil and gas of reduction discharged nitrous oxides Boiler and its method, including fuel channel, combustion-supporting wind pipeline, low NO, boiler body, smoke discharging pipe, chimney, circulation cigarette Feed channel, combustion fan and water inlet pipe.The radiation heat transfer face area of boiler body reduces by 30%~50%, convection current compared with plain cylindrical furnace Heat-transfer surface area increase by 15%~25%;15%~25% boiler low-temperature fume passes through circulating flue gas cooler, circulating flue gas Enter combustion fan after pipeline, mixed with fresh air and enter low NO as combustion air.The device and method passes through group Knit burner hearth inside combustion with meagre oxygen and arrangement low NO is to reduce the generation of nitrogen oxides, low NO is complicated, should The amount that method can reduce generation nitrogen oxides in flue gas is limited.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of heat accumulating type natural gas boiler energy-saving denitration integration System, solves current conventional gas boiler high energy consumption, high fume temperature, and heat accumulating type natural gas boiler discharged nitrous oxides are high, The problems such as denitration efficiency is low, denitrification is single, denitration cost is high.
In order to solve the above technical problems, heat accumulating type natural gas boiler energy-saving denitration integral system of the present utility model includes Boiler body, I-tube combustion chamber, two groups of heat accumulating type neat gas burners, condensers, wherein:
I-tube combustion chamber is located inside boiler body, and SNCR reactions occur in I-tube combustion chamber;The two of boiler body End is respectively arranged with two gas pipelines for stretching into I-tube combustion chamber;The two ends of boiler body are also respectively provided with two and stretch into I The reducing agent pipeline of type combustion chamber tube, is connected with reducing agent control valve and compressed air piping, is inputted from reducing agent control valve Reducing agent sprays under the auxiliary for the compressed air that compressed air piping is inputted by reducing agent pipeline into I-tube combustion chamber; Boiler feed pipe, boiler discharging tube are additionally provided with boiler body;
Two groups of heat accumulating type neat gas burners are connected with the two ends of boiler body respectively, and pass through reversal valve and air respectively Pipe, fume pipe connection, every group of heat accumulating type neat gas burner include two from being symmetrically installed that boiler body is gradually distance from respectively High-temperature thermal storage body, denitration catalyst heat storage, low-temperature heat accumulating body, the flue gas produced in I-tube combustion chamber is after high-temperature thermal storage body Into denitration catalyst heat storage, and the generation SCR reactions in denitration catalyst heat storage;
Condenser is connected with fume pipe, and flue gas with 150 DEG C or so of temperature after reversal valve by entering condenser and with low Discharged in 50 DEG C of temperature;
Reducing agent control valve and commutation valve events interlocked control, when air is flowed into from left end heat accumulating type neat gas burner When, left end reducing agent control valve injection reducing agent, right-hand member reducing agent control valve is closed, when air fires from right-hand member heat accumulating type natural gas When burner is flowed into, right-hand member reducing agent control valve injection reducing agent, left end reducing agent control valve is closed;
By a commutation cycle, reversal valve automatic reverse.
Preferably, the reducing agent is that mass fraction is 10%-60% urea liquids.
Preferably, the reducing agent pipeline, which is tilted, installs, with heat accumulating type neat gas burner into 15-30 ° of angle.
Preferably, the commutation cycle is 40~100 seconds.
The heat accumulating type natural gas boiler energy-saving denitration integral system of said structure uses heat accumulating type high-temperature air burning skill Art and SNCR and SCR combined denitration technologies, and denitrification reducing agent is using combustion chamber injection, reducing agent control valve and commutation Valve interlocks action control, protrudes energy-saving effect of the present utility model, effectively save fuel;Environment protecting is protruded, flue gas nitrogen oxygen Compound discharge capacity reduction by more than 50%;Cost-effective obvious, the compact reduction production installation cost of overall system architecture is combined out of stock Catalyst cost in technology reduction running.
Brief description of the drawings
Fig. 1 is the schematic diagram of heat accumulating type natural gas boiler energy-saving denitration integral system of the present utility model.
Wherein, 1 is boiler body, and 2 be I-tube combustion chamber, and 3-1 is high-temperature thermal storage body, and 3-2 is denitration catalyst heat storage, 3-3 is low-temperature heat accumulating body, and 4 be reversal valve, and 5 be air hose, and 6 be fume pipe, and 7 be reducing agent control valve, and 8 be reducing agent pipeline, 9 It is gas pipeline for compressed air piping, 10,11 be boiler feed pipe, and 12 be boiler discharging tube, and 13 be condenser.
Embodiment
As shown in figure 1, heat accumulating type natural gas boiler energy-saving denitration integral system of the present utility model includes:
Boiler body 1, I-tube combustion chamber 2, two groups of heat accumulating type neat gas burners, condensers 13, wherein:
I-tube combustion chamber 2 is located inside boiler body 1, and SNCR reactions occur in I-tube combustion chamber 2;
The two ends of boiler body 1 are respectively arranged with two gas pipelines 10 for stretching into I-tube combustion chamber 2;
The two ends of boiler body 1 are also respectively provided with two reducing agent pipelines 8 for extending into I-tube combustion chamber 2, and it is with going back Former agent control valve 7 and compressed air piping 9 are connected, and the reducing agent inputted from reducing agent control valve 7 is inputted in compressed air piping 9 Compressed air auxiliary it is lower sprayed by reducing agent pipeline 8 into I-tube combustion chamber 2, the mass fraction of reducing agent is 10%- 60%;Reducing agent pipeline 8, which is tilted, to be installed, with heat accumulating type neat gas burner into 15-30 ° of angle;
Boiler feed pipe 11, boiler discharging tube 12 are additionally provided with boiler body 1;
Two ends of two groups of heat accumulating type neat gas burners 4 respectively with boiler body 1 are connected, and respectively by reversal valve 4 with Air hose 5, fume pipe 6 are connected, i.e., when left end heat accumulating type neat gas burner is connected with air hose 5, right-hand member heat accumulating type is natural Air burner is connected with fume pipe 6, and when left end heat accumulating type neat gas burner is connected with fume pipe 6, right-hand member heat accumulating type is natural Air burner is connected with air hose 5, what every group of heat accumulating type neat gas burner was gradually distance from including two from boiler body 1 respectively Produced in high-temperature thermal storage body 3-1, denitration catalyst heat storage 3-2, the low-temperature heat accumulating body 3-3 being symmetrically installed, I-tube combustion chamber 2 Flue gas, which enters after high-temperature thermal storage body 3-1 in denitration catalyst heat storage 3-2, occurs SCR reactions;
Condenser 13 is connected with fume pipe 6, flue gas by after reversal valve with 150 DEG C or so of temperature enter condenser and with Temperature discharge less than 50 DEG C, the moisture in flue gas is condensed in this course;
Reducing agent control valve 7 acts interlocked control with reversal valve 4, when air is flowed into from left end heat accumulating type neat gas burner When, the injection reducing agent of left end reducing agent control valve 7, right-hand member reducing agent control valve 7 closes, when air is from right-hand member heat accumulating type natural gas Combustor flow is fashionable, and the injection reducing agent of right-hand member reducing agent control valve 7, left end reducing agent control valve 7 is closed;
By a commutation cycle, reversal valve automatic reverse, air input changes therewith with fume emission.
Hereafter the operation principle to heat accumulating type natural gas boiler energy-saving denitration integral system of the present utility model is said Bright, the heat accumulating type neat gas burner of left end is connected with air hose 5 in the present embodiment, the heat accumulating type neat gas burner of right-hand member It is connected with fume pipe 6, i.e., air enters from left end, the flue gas after burning is discharged from right-hand member.
Natural gas and air are respectively with 300~800m3/ h and 2000~9000m3/ h speed input, in I-tube combustion chamber Ignited in 2, the urea that mass fraction is 10%~60% is by the reducing agent control valve 7 of left end, reducing agent pipeline 8 and in compression It is ejected under the auxiliary for the compressed air that air duct 9 is inputted in I-tube combustion chamber, the flue gas produced with combustion of natural gas is mixed Generation SNCR (SNCR) denitration, realizes the reduction of nitrogen oxides in I types combustion chamber;Flue gas is successively afterwards High-temperature thermal storage body 3-1, denitration catalyst heat storage 3-2 into right-hand member, low-temperature heat accumulating body 3-3, high-temperature thermal storage body 3-1 absorb heat and stored SCR (SCR) denitration occurs in heat, out of stock catalytic thermal storage body 3-2, further reduces nitrogen oxides, Low Temperature Storage Hot body 3-3 heat absorptions and accumulation of heat;Flue gas enters condenser 13 with 150 DEG C or so of temperature through reversal valve 4 by fume pipe 6 afterwards, The moisture in condensation recovered flue gas occurs in condenser 13, final flue gas is discharged with the temperature less than 50 DEG C.
The reversal valve automatic reverse after a commutation cycle, heat accumulating type neat gas burner and the fume pipe 6 of left end connect Connect, the heat accumulating type neat gas burner of right-hand member is connected with air hose 5, i.e., air is inputted from right-hand member, flue gas after burning is from left end Discharge, the high-temperature thermal storage body 3-1 now absorbed heat during upper one and low-temperature heat accumulating body 3-3 heat releases, by the air preheat of input extremely Close to or up ignition temperature, energy-conservation purpose is realized.
Heat accumulating type natural gas boiler energy-saving denitration integral system of the present utility model uses heat accumulating type natural gas boiler system System, air and natural gas alternately from two ends input, are realized in the heat absorption and heat release of heat accumulating type neat gas burner, recovered flue gas Heat is used for the gas preheater of input, compared to U-tube combustion chamber, more uniform temperature in I-tube combustion chamber, therefore burning More fully, realize energy-conservation, save fuel purpose.Meanwhile, the utility model sprays into reducing agent into I-tube combustion chamber, in I-tube SNCR denitration occurs in combustion chamber and occurs SCR denitration in heat accumulating type neat gas burner, it is out of stock with SNCR and SCR joints Technology, can reduce the content of nitrogen oxides in effluent, nitrogen oxides in effluent discharge capacity is reduced by more than 50%, realize environmental protection Purpose, can reduce denitrating catalyst cost again.By the way that reducing agent pipeline is set to heat accumulating type neat gas burner into 15- The mode that 30 ° of angles are installed, make reducing agent spray into after with the mixture length length of flue gas, contact more abundant, improve SNCR denitration and imitate Rate, further reduces the escaping of ammonia degree.Condensed water in condenser, recovered flue gas is arranged on flue after reversal valve, cigarette is reduced Heat in gas exhaust temperature, abundant recovered flue gas, further improves energy-saving effect.
The utility model preferred embodiment and embodiment are explained in detail above in conjunction with accompanying drawing, but this Utility model is not limited to the above-described embodiment and examples, in the knowledge that those skilled in the art possess, may be used also So that various changes can be made without departing from the concept of the premise utility.

Claims (5)

1. a kind of heat accumulating type natural gas boiler energy-saving denitration integral system, including boiler body, I-tube combustion chamber, two groups of storages Hot type neat gas burner, condenser, wherein:
I-tube combustion chamber is located inside boiler body, and SNCR reactions occur in I-tube combustion chamber;The two ends of boiler body point Two gas pipelines for stretching into I-tube combustion chamber are not provided with;The two ends of boiler body are also respectively provided with two and stretch into I-tube The reducing agent pipeline of combustion chamber, is connected with reducing agent control valve and compressed air piping, the reduction inputted from reducing agent control valve Agent is sprayed under the auxiliary for the compressed air that compressed air piping is inputted by reducing agent pipeline into I-tube combustion chamber;Boiler Boiler feed pipe, boiler discharging tube are additionally provided with body;
Two groups of heat accumulating type neat gas burners are connected with the two ends of boiler body respectively, and respectively by reversal valve and air hose, Fume pipe connect, every group of heat accumulating type neat gas burner respectively include two be gradually distance from from boiler body high-temperature thermal storage bodies, The flue gas produced in denitration catalyst heat storage, low-temperature heat accumulating body, I-tube combustion chamber enters denitration catalyst after high-temperature thermal storage body and stored Hot body, and the generation SCR reactions in denitration catalyst heat storage;
Condenser is connected with fume pipe, and flue gas with 150 DEG C or so of temperature after reversal valve by entering condenser and with less than 50 DEG C temperature discharge;
Reducing agent control valve and commutation valve events interlocked control, it is left when air is flowed into from left end heat accumulating type neat gas burner Reducing agent control valve injection reducing agent is held, right-hand member reducing agent control valve is closed, when air is from right-hand member heat accumulating type neat gas burner During inflow, right-hand member reducing agent control valve injection reducing agent, left end reducing agent control valve is closed;
By a commutation cycle, reversal valve automatic reverse.
2. heat accumulating type natural gas boiler energy-saving denitration integral system according to claim 1, it is characterised in that described to go back Former agent is that mass fraction is 10%-60% urea liquids.
3. heat accumulating type natural gas boiler energy-saving denitration integral system according to claim 1, it is characterised in that reducing agent Pipeline, which is tilted, to be installed, with heat accumulating type neat gas burner into 15-30 ° of angle.
4. heat accumulating type natural gas boiler energy-saving denitration integral system according to claim 1, it is characterised in that described to change It it is 40~100 seconds to the cycle.
5. heat accumulating type natural gas boiler energy-saving denitration integral system according to claim 1, it is characterised in that every group high Intermediate temperature regenerator body, denitration catalyst heat storage, low-temperature heat accumulating body are installed by axisymmetrical of air inlet/outlet pipe.
CN201621453497.3U 2016-12-27 2016-12-27 Heat accumulating type natural gas boiler energy-saving denitration integral system Expired - Fee Related CN206404566U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110508129A (en) * 2019-08-27 2019-11-29 北京龙电宏泰环保科技有限公司 A kind of efficient collaboration method of denitration and device that nitrogen oxides variable working condition is adjusted
CN111397398A (en) * 2020-04-14 2020-07-10 中海石油气电集团有限责任公司 A low NOx emission submerged combustion gasifier

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110508129A (en) * 2019-08-27 2019-11-29 北京龙电宏泰环保科技有限公司 A kind of efficient collaboration method of denitration and device that nitrogen oxides variable working condition is adjusted
CN110508129B (en) * 2019-08-27 2024-09-24 北京龙电宏泰环保科技有限公司 Efficient collaborative denitration method for adjusting variable working conditions of nitrogen oxides
CN111397398A (en) * 2020-04-14 2020-07-10 中海石油气电集团有限责任公司 A low NOx emission submerged combustion gasifier

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