CN110887032A - Natural gas cold flame combustion horizontal fire tube steam boiler - Google Patents
Natural gas cold flame combustion horizontal fire tube steam boiler Download PDFInfo
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- CN110887032A CN110887032A CN201910891461.5A CN201910891461A CN110887032A CN 110887032 A CN110887032 A CN 110887032A CN 201910891461 A CN201910891461 A CN 201910891461A CN 110887032 A CN110887032 A CN 110887032A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 77
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 239000003345 natural gas Substances 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 67
- 239000000779 smoke Substances 0.000 claims abstract description 62
- 239000007789 gas Substances 0.000 claims abstract description 28
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- 239000007921 spray Substances 0.000 claims abstract description 12
- 239000000969 carrier Substances 0.000 claims abstract description 3
- 238000005516 engineering process Methods 0.000 claims description 22
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 12
- 239000003546 flue gas Substances 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000013461 design Methods 0.000 claims description 6
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 230000008016 vaporization Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B11/00—Steam boilers of combined fire-tube type and water-tube type, i.e. steam boilers of fire-tube type having auxiliary water tubes
- F22B11/04—Steam boilers of combined fire-tube type and water-tube type, i.e. steam boilers of fire-tube type having auxiliary water tubes the fire tubes being in horizontal arrangement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
Abstract
A natural gas cold flame combustion horizontal fire tube steam boiler comprises a gas valve group (1), an explosion-proof fan (2), a combustion head, a hearth (4), a return-stroke smoke tube (5), a rear smoke box (6), two return-stroke threaded smoke tubes (7), a turning smoke chamber (8), an economizer (9), a condenser (10), a smoke outlet (11), a hearth access door (12), a boiler shell cylinder (13) and a recirculation pipeline (14); the combustion head is a cold flame combustion head, the outlet of the explosion-proof fan is connected with the cold flame combustion head, and the mixed gas is sprayed into the hearth through the cold flame combustion head to be combusted; the boiler shell cylinder body comprises a hearth, a return stroke threaded smoke pipe and two return stroke threaded smoke pipes; the rear part of the hearth is directly connected with a return smoke pipe, and the return smoke pipe is connected with the two return smoke pipes in series through a rear smoke box; the front end of the hearth is provided with a single water drainage pipe bundle which is vertically arranged, and mixed gas spray holes (steel plates are spray hole carriers) are arranged among the pipe bundles; the lower part of the boiler shell barrel is provided with an energy saver which is connected with the two return smoke pipes through a turning smoke chamber, and the rear part of the energy saver is connected with a condenser; the rear part of the condenser is provided with a smoke outlet.
Description
The technical field is as follows:
the invention belongs to the technical field of gas-steam boilers, and particularly relates to a natural gas cold flame combustion horizontal fire tube steam boiler.
Background art:
the WNS type horizontal internal combustion oil and gas fire tube steam boiler is a very classic oil and gas furnace type. The boiler adopts a horizontal internal combustion full-wet back type structure, is matched with a high-efficiency threaded smoke pipe, is internally provided with a boiler shell for all evaporation heating, contains high-temperature smoke and water, is matched with a perfect heat-preservation outer package design, has less heat dissipation loss, high efficiency, large water capacity, good safety, long service life and convenient maintenance, and is a common fuel oil and gas boiler type below 30t/h at present.
①, after TSG 002-2010 'supervision and management regulation of boiler energy saving technology' issued in 2012 countries, the boiler needs to be matched with an external energy saver, the boiler efficiency can be further improved to more than 92%, ②, the national NOx emission requirement on the gas boiler is more and more strict, the emission standard is from 400mg/m3 to 150mg/m3 and then to 80mg/m3, even part of cities and regions directly limit the standard to an international first-class standard not more than 30mg/m3, the whole standard change only takes 2-3 years, the urgent requirement of the country on low nitrogen emission of the gas boiler is indicated, the low NOx combustion technology is widely applied, the most used on the WNS boiler type at present is the low NOx diffusion combustion + flue gas recirculation technology and the full premix surface combustion technology, and the two technologies do not change the boiler body structure greatly.
The WNS type boiler is generally in a single-layer arrangement and produces smoke at the top, the energy saver can only be arranged above the boiler body, when the boiler does not feed water, the steam and water at the top in the energy saver can not automatically flow to the boiler barrel and can only flow to an open water tank through a water pump, energy is wasted in the process, the energy saver is communicated with the open container, oxygen corrosion is easy to generate, the problems caused by ② low NOx diffusion type combustion and flue gas recirculation low NOx technology are mainly caused by the fact that the technology needs a larger hearth structure, the requirement of larger energy consumption is met, the energy consumption coefficient of the boiler is higher, and the quality of the flue gas is higher, the air pressure head of the boiler is required to be higher, and the problems caused by the technology that the air pressure head is higher, the air pressure head of the boiler is required to be premixed, and the air pressure head is higher.
The invention is based on WNS type steam boiler, based on the above problems, further optimization and research are carried out.
The invention content is as follows:
the invention mainly aims to provide a natural gas cold flame combustion horizontal fire tube steam boiler, which combines a cold flame combustion technology with a boiler furnace and adopts a circular cold flame combustion head (3) structure, so that on one hand, NOx emission is reduced, on the other hand, the size of a hearth is reduced, more convection heating surfaces are arranged conveniently, and meanwhile, the size of a boiler shell barrel (13) is reduced. The invention also aims to provide a natural gas cold flame combustion horizontal fire tube steam boiler, which fully considers the maintainability of equipment and enables an economizer (9) and a condenser (10) to be arranged at the bottom of a boiler shell cylinder (13) through the lateral drawing design of a heating surface. The invention also aims to provide a natural gas cold flame combustion horizontal fire tube steam boiler, wherein an energy saver (9) is arranged below a boiler shell cylinder (13), a recirculation pipeline (14) is arranged, and boiler water circulation is utilized to prevent the energy saver from vaporizing and reduce oxygen corrosion.
The invention has the technical scheme that the natural gas cold flame combustion horizontal fire tube steam boiler comprises a gas valve group (1), an explosion-proof fan (2), a combustion head, a hearth (4), a one-return thread smoke tube (5), a rear smoke box (6), a two-return thread smoke tube (7), a turning smoke chamber (8), an energy saver (9), a condenser (10), a smoke outlet (11), a hearth access door (12), a boiler shell barrel (13), a recirculation pipeline (14) and the like. The combustion head is a cold flame combustion head (3), the outlet of the explosion-proof fan (2) is connected with the cold flame combustion head (3), and the mixed gas is sprayed into the hearth through the cold flame combustion head (3) to be combusted; the boiler shell cylinder (13) comprises a hearth (4), a return threaded smoke pipe (5) and two return threaded smoke pipes (7); the rear part of the hearth is directly connected with a return smoke pipe, and the return smoke pipe is connected with the two return smoke pipes in series through a rear smoke box (6); the front end part of the hearth is provided with a single water drainage pipe bundle which is vertically arranged, and mixed gas spray holes (steel plates are spray hole carriers) are arranged among the pipe bundles; the lower part of the boiler shell barrel is provided with an energy saver (9), the energy saver is connected with the two return smoke pipes through a turning smoke chamber (8), and the rear part of the energy saver is connected with a condenser (10); the rear part of the condenser is provided with a smoke outlet (11). The smoke tube is a return thread smoke tube (5).
Adopting a cold flame combustion technology: slightly excessive air (the coefficient of the excessive air is lower than 1.15, the volume ratio) is fully mixed with natural gas, and then the mixed gas is sprayed into a hearth at high speed through a cold flame combustion head (3) for combustion. The structure of the cold flame combustion head is characterized in that a single-row water pipe bundle which is vertically arranged is designed at the end part of a hearth, a V-shaped porous steel plate is designed between the two pipes, and small holes with the diameter smaller than the flameout diameter of natural gas are formed in the steel plate and used as mixed gas spray holes. The mixed gas is sprayed out from the small holes, passes through the gaps of the water pipe bundles, is sprayed into the hearth at a high speed for combustion to form sheet-shaped flame, and meanwhile, high-temperature flue gas flows back at two sides of the flame and absorbs heat by the water pipe bundles, the hearth, a return-stroke threaded smoke pipe (5), a two-return-stroke threaded smoke pipe (7), an economizer (9) and a condenser (10).
The cold flame combustion head (3) and the hearth (4) are combined: a vertically arranged single water drainage pipe bundle is designed at the end part of the hearth, a V-shaped steel plate with holes is designed between two pipes of the water drainage pipe, and small holes with the diameter smaller than the flameout diameter of natural gas are formed in the steel plate to serve as spray holes, so that a cold flame combustion head is formed; the holed steel plate is a spray hole carrier.
The heating surface drawer type design is adopted, the heating surface pipes of the energy saver (9) and the condenser (10) are supported on a steel frame which can slide laterally, and the energy saver (9) and the heating surface pipes of the condenser can be plugged into the flue from the side edge of the flue; the whole flue is fixed at the bottom of the boiler.
The cold flame combustion technology is matched with a thick and short type hearth, and the size of the hearth is 10-15% of the total volume of the hearth and a flashback chamber of a conventional WNS type boiler; the rear part of the hearth is directly connected with a return threaded smoke pipe (5);
a three-way valve is arranged at a water supply inlet of the energy saver, one path of water outlet is connected with a boiler water supply pump, and the other path of water outlet is connected to the bottom of the boiler shell cylinder through a recirculation pipeline; when the boiler feed water is detected, the three-way valve is switched to only communicate the feed water pump with the inlet of the economizer (9), and the economizer (9) is cooled by the feed water; when the boiler water supply is detected to be stopped, the three-way valve is switched to be only communicated with the boiler shell cylinder (13) and the energy saver (9), so that the energy saver (9) and the boiler shell cylinder (13) form a communicating device, water heated in the energy saver (9) is led to the boiler shell cylinder (13), and meanwhile, boiler water is supplemented into the energy saver (9) through the recirculation pipeline (14), so that the energy saver (9) is ensured not to be vaporized.
The mixed gas is sprayed out from the small holes, passes through the gaps of the water pipe bundles, is sprayed into the hearth at a high speed for combustion to form sheet-shaped flame, and meanwhile, high-temperature flue gas flows back at two sides of the flame, and the heat generated by combustion is absorbed by the water pipe bundles, the hearth, a return stroke threaded smoke pipe (5), a two-return stroke threaded smoke pipe (7), an energy saver (9) and a condenser (10). The high-temperature flue gas cools and preheats the mixed gas when reflowing at two sides of the flame, reduces the combustion temperature while stably combusting, and realizes low NOx emission.
An automatic (L-shaped) three-way valve is arranged at a feed water inlet of the energy saver, one way is connected with a boiler feed water pump, and the other way is connected to the bottom of a boiler shell cylinder through a recirculation pipeline. When the boiler feed water is detected, the three-way valve is switched to only communicate the feed water pump with the inlet of the economizer (9), and the economizer (9) is cooled by the feed water; when the boiler water supply is detected to be stopped, the three-way valve is switched to only communicate the boiler shell cylinder (13) with the energy saver (9), so that the energy saver (9) and the boiler shell cylinder (13) form a communicating device, the water heated in the energy saver (9) is led to the boiler shell cylinder (13), and meanwhile, the boiler water is supplemented into the energy saver (9) through the recirculation pipeline (14), so that the energy saver (9) is ensured not to be vaporized, and the service life of the energy saver (9) is prolonged.
Has the advantages that: the invention is an improved WNS type boiler, and on the basis of the structure of the existing WNS type horizontal internal combustion boiler, the invention designs a hearth into a short and thick type by utilizing the characteristic of small volume of a fully premixed cold flame combustion hearth; a return threaded smoke pipe (5) is directly connected to the rear part of the hearth, so that the length dimension of the boiler in the length direction is greatly reduced. An economizer (9) and a condenser (10) are arranged below a boiler shell cylinder (13), the boiler efficiency is improved by reducing the exhaust gas temperature of the boiler, the problem of vaporization of the economizer is solved through reasonable layout, and integrated arrangement is realized. In addition, the introduction of the fully premixed cold flame combustion technology reduced the NOx emissions to below 30mg/m 3.
The energy saver and the boiler barrel are arranged below the boiler body, when the boiler does not feed water, steam and water in the energy saver can still automatically flow to the boiler barrel, and meanwhile, the energy saver is not easy to generate oxygen corrosion. The energy saver can not be vaporized, the automatic water supply of the boiler is stable and continuous, the water in the energy saver can not be vaporized, blocked by steam, vibrated, abnormal sound, oxygen corrosion and the like, and the service life of the steel pipe type energy saver is ensured. The full-premixing cold flame combustion technology is adopted, the cold flame combustion head (3) and the hearth (4) are combined, and the cold flame combustion of the small hearth is realized, so that the emission of NOx is reduced, meanwhile, the hearth occupation space of the WNS boiler is saved, and the overall size of the boiler is reduced. By adopting the heating surface drawer type design, the energy saver (9) and the condenser (10) are arranged at the bottom of the boiler, so that the boiler is more compact in structure and the energy saver recirculation pipeline is convenient to place while the maintenance and the replacement are convenient. The cold flame combustion technology can realize low NOx, and simultaneously, the excess air coefficient can be controlled below 1.15 in the whole process, and compared with other technologies, the energy efficiency of the boiler is improved. And the problems of high energy consumption, flue gas corrosion of combustion equipment and the like caused by low NOx diffusion combustion and flue gas recirculation low NOx technology are also avoided.
The invention solves the defects of large structure size, easy vaporization, short service life, unstable exhaust gas temperature and the like of the traditional WNS type boiler; in addition, on the basis of the WNS type boiler, a cold flame combustion technology and a flue gas condensation technology are introduced, measures such as combustion, heat transfer, water circulation and the like are optimized, low NOx emission (less than or equal to 30mg/m3) is realized, the temperature of flue gas is stably reduced to 50 ℃, and the efficiency of the boiler is improved to nearly 100%.
Description of the drawings:
figure 1 is a front view of a boiler,
figure 2 is a plan view of the boiler,
FIG. 3, left side view of the boiler;
fig. 4 is a schematic view of a cold flame burner structure.
The specific implementation mode is as follows:
referring to FIGS. 1-4, embodiments of the various objects of the present invention are as follows:
the main purpose of the invention is realized as follows: as shown in the attached drawings, the horizontal fire tube steam boiler for natural gas cold flame combustion mainly comprises a gas valve group (1), an explosion-proof fan (2), a cold flame combustion head (3), a hearth (4), a return-stroke threaded smoke tube (5), a rear smoke box (6), a two-return-stroke threaded smoke tube (7), a turning smoke chamber (8), an economizer (9), a condenser (10), a smoke outlet (11), a hearth access door (12), a boiler shell barrel (13), a recirculation pipeline (14) and the like.
The cold flame combustion technology comprises the following steps: slightly excessive air and natural gas are fully mixed, and then the mixed gas is sprayed into a hearth at a high speed through a cold flame combustion head (3) to be combusted.
The structure of the cold flame combustion head (3) is shown in figure 4, a single water drainage pipe bundle which is vertically arranged is designed at the end part of a hearth, a steel plate with a V-shaped section and a hole is designed between the two pipes, and a small hole with the diameter smaller than the flameout diameter of natural gas is formed in the steel plate and used for spraying out mixed gas (the natural gas is mixed with air). The mixed gas is sprayed out from the small holes, passes through the gaps of the water pipe bundles, is sprayed into the hearth at a high speed for combustion to form sheet-shaped flame, and meanwhile, high-temperature flue gas flows back at two sides of the flame to cool and preheat the mixed gas, so that the combustion temperature is reduced while stable combustion is realized, and low NOx emission is realized.
The cold flame combustion technology is matched with a short and thick hearth, and the size of the hearth is 10-15% of the total volume of the hearth and an ember chamber of a conventional WNS type boiler; the rear part of the hearth is directly connected with a return threaded smoke pipe (5), so that the space utilization rate is greatly increased, and the size of the boiler is reduced.
As shown in the attached drawings (1) and (3), the heat receiving surface pipes of the energy saver (9) and the condenser (10) are supported on a steel frame which can slide laterally, and the water inlet side and the water outlet side are fixed on a side flange cover; meanwhile, a flange is arranged at an opening at one side of the rectangular flue, and a heated surface pipe is plugged into the flue from the side edge of the flue. In order to facilitate drawing and positioning, the flue bottom plate is made of stainless steel and is provided with a slide rail. The whole flue is fixed on a base at the bottom of the boiler.
As shown in the attached drawing, an automatic three-way valve is arranged at a feed water inlet of the energy saver, one way is connected with a feed water pump of the boiler, and the other way is connected to the bottom of the boiler shell through a recirculation pipeline. When the boiler feed water is detected, the three-way valve is switched to only communicate the feed water pump with the inlet of the economizer (9), and the economizer (9) is cooled by the feed water; when the boiler water supply is detected to be stopped, the three-way valve is switched to only communicate the boiler shell cylinder (13) with the energy saver (9), so that the energy saver (9) and the boiler shell cylinder (13) form a communicating device, the water heated in the energy saver (9) is led to the boiler shell cylinder (13), and meanwhile, the boiler water is supplemented into the energy saver (9) through the recirculation pipeline (14), so that the energy saver (9) is ensured not to be vaporized, and the service life of the energy saver (9) is prolonged.
Claims (7)
1. A natural gas cold flame combustion horizontal fire tube steam boiler is characterized by comprising a gas valve group (1), an explosion-proof fan (2), a combustion head, a hearth (4), a return-stroke smoke tube (5), a rear smoke box (6), two return-stroke threaded smoke tubes (7), a turning smoke chamber (8), an energy saver (9), a condenser (10), a smoke outlet (11), a hearth access door (12), a boiler shell barrel (13) and a recirculation pipeline (14); the combustion head is a cold flame combustion head (3), the outlet of the explosion-proof fan (2) is connected with the cold flame combustion head (3), and the mixed gas is sprayed into the hearth through the cold flame combustion head (3) to be combusted; the boiler shell cylinder body comprises a hearth, a return stroke threaded smoke pipe and two return stroke threaded smoke pipes; the rear part of the hearth is directly connected with a return smoke pipe, and the return smoke pipe is connected with the two return smoke pipes in series through a rear smoke box (6); the front end of the hearth is provided with a single water drainage pipe bundle which is vertically arranged, and mixed gas spray holes (steel plates are spray hole carriers) are arranged among the pipe bundles; the lower part of the boiler shell barrel is provided with an energy saver (9), the energy saver is connected with the two return smoke pipes through a turning smoke chamber (8), and the rear part of the energy saver is connected with a condenser (10); the rear part of the condenser is provided with a smoke outlet (11).
2. The natural gas cold flame combustion horizontal fire tube steam boiler as claimed in claim 1, wherein the cold flame combustion head (3) and the hearth (4) are combined: a vertically arranged single water drainage pipe bundle is designed at the end part of the hearth, a V-shaped steel plate with holes is designed between two pipes of the water drainage pipe, and small holes with the diameter smaller than the flameout diameter of natural gas are formed in the steel plate to serve as spray holes, so that a cold flame combustion head is formed; the holed steel plate is a spray hole carrier.
3. The natural gas cold flame combustion horizontal fire tube steam boiler is characterized in that a heating surface drawer type design is adopted, heating surface pipes of an economizer (9) and a condenser (10) are supported on a steel frame capable of sliding laterally, and the economizer (9) and the heating surface pipes of the condenser can be plugged into a flue from the side edge of the flue; the whole flue is fixed at the bottom of the boiler.
4. The natural gas cold flame combustion horizontal fire tube steam boiler of claim 1, which is characterized in that a cold flame combustion technology is adopted: the slightly excessive air and the natural gas are fully mixed, and then the mixed gas is sprayed into a hearth at a high speed through a cold flame combustion head (3) to be combusted; the structure of the cold flame combustion head is characterized in that a single-row water pipe bundle which is vertically arranged is designed at the end part of a hearth, a V-shaped porous steel plate is designed between the two pipes, and small holes with the diameter smaller than the flameout diameter of natural gas are formed in the steel plate and used as mixed gas spray holes.
5. The natural gas cold flame combustion horizontal fire tube steam boiler as claimed in claim 1, wherein the mixed gas is ejected from the small holes, passes through the gaps of the water tube bundles, is ejected into the hearth at high speed for combustion to form a sheet flame, and simultaneously, high-temperature flue gas flows back at two sides of the flame and is absorbed by the water tube bundles, the hearth, a return-stroke threaded smoke tube (5), a two-return-stroke threaded smoke tube (7), an economizer (9) and a condenser (10).
6. The natural gas cold flame combustion horizontal fire tube steam boiler of claim 1, is characterized in that a cold flame combustion technology is utilized to match a thick and short hearth, and the size of the hearth is 10-15% of the total volume of a hearth and a back combustion chamber of a conventional WNS type boiler; the rear part of the hearth is directly connected with a return threaded smoke pipe (5).
7. The natural gas cold flame combustion horizontal fire tube steam boiler according to one of claims 1 to 7, wherein a three-way valve is arranged at a water supply inlet of the economizer, one water outlet is connected with a boiler water supply pump, and the other water outlet is connected to the bottom of the shell barrel through a recirculation pipeline; when the boiler feed water is detected, the three-way valve is switched to only communicate the feed water pump with the inlet of the economizer (9), and the economizer (9) is cooled by the feed water; when the boiler water supply is detected to be stopped, the three-way valve is switched to be communicated with the energy saver (9) only through the boiler shell cylinder (13), so that the energy saver (9) and the boiler shell cylinder (13) form a communicating device, water heated in the energy saver (9) is led to the boiler shell cylinder (13), and meanwhile, boiler water is supplemented into the energy saver (9) through the recirculation pipeline (14).
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| CN201910891461.5A CN110887032A (en) | 2019-09-20 | 2019-09-20 | Natural gas cold flame combustion horizontal fire tube steam boiler |
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| CN201910891461.5A CN110887032A (en) | 2019-09-20 | 2019-09-20 | Natural gas cold flame combustion horizontal fire tube steam boiler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112728521A (en) * | 2021-02-08 | 2021-04-30 | 四川新城都锅炉有限公司 | Low-nitrogen boiler with built-in burner |
| CN114017762A (en) * | 2021-11-09 | 2022-02-08 | 江苏双良锅炉有限公司 | Horizontal internal combustion steam boiler with porous ceramic medium combustion |
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| CN205279448U (en) * | 2015-12-08 | 2016-06-01 | 安阳方快锅炉有限公司 | Full premix condensation boiler |
| CN206739256U (en) * | 2017-05-23 | 2017-12-12 | 陈黎 | A kind of single backhaul WNS structure boilers |
| CN107559810A (en) * | 2017-09-06 | 2018-01-09 | 江苏双良锅炉有限公司 | A kind of vertical fully pre-mixing gas combustion steam or hot-water boiler |
| CN207865354U (en) * | 2017-12-14 | 2018-09-14 | 重庆太湖锅炉股份有限公司 | The low nitrogen boiler of three backhaul of more flues |
| CN110068011A (en) * | 2019-05-10 | 2019-07-30 | 无锡顺盟科技有限公司 | A kind of plane cool flame low NO |
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| CN112728521A (en) * | 2021-02-08 | 2021-04-30 | 四川新城都锅炉有限公司 | Low-nitrogen boiler with built-in burner |
| CN114017762A (en) * | 2021-11-09 | 2022-02-08 | 江苏双良锅炉有限公司 | Horizontal internal combustion steam boiler with porous ceramic medium combustion |
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