CN214619653U - Flue gas waste heat recovery system of gas-fired hot water boiler sharing economizer - Google Patents
Flue gas waste heat recovery system of gas-fired hot water boiler sharing economizer Download PDFInfo
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- CN214619653U CN214619653U CN202120637266.2U CN202120637266U CN214619653U CN 214619653 U CN214619653 U CN 214619653U CN 202120637266 U CN202120637266 U CN 202120637266U CN 214619653 U CN214619653 U CN 214619653U
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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
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Abstract
The utility model provides a flue gas waste heat recovery system of gas-fired hot water boiler sharing energy-saving appliance relates to boiler equipment technical field. The system comprises a plurality of gas-fired hot water boilers, a countercurrent economizer, a water supply pipeline, a water return pipeline, a smoke exhaust pipeline, a condensation water supply pipeline and a condensation water outlet pipeline, wherein each gas-fired hot water boiler is respectively connected with the water supply pipeline and the water return pipeline; the condensation water supply pipeline is connected with the countercurrent energy saver and the water return pipeline, and the condensation water outlet pipeline is connected with the countercurrent energy saver and the condensation water outlet pipeline. The upper part of the countercurrent energy saver is provided with a smoke inlet and a water outlet, the lower part of the countercurrent energy saver is provided with a smoke outlet and a water inlet, the flow directions of smoke at the smoke inlet and the smoke outlet are mutually vertical, and a plurality of screwed smoke pipes are arranged in the countercurrent energy saver in parallel. The system has the advantages of long service life, high energy-saving efficiency and capability of avoiding the problem of backward flowing of the boiler body after flue gas backflow and circulating water leakage.
Description
Technical Field
The utility model belongs to the technical field of boiler equipment technique and specifically relates to a flue gas waste heat recovery system of gas-fired hot water boiler sharing energy-saving appliance.
Background
The gas-fired hot water boiler usually uses natural gas, liquefied petroleum gas, city coal gas, biogas, etc. as fuel to heat water, in the industrial application of the gas-fired hot water boiler, generally every gas-fired boiler is equipped with an energy saver, the energy saver adopts the structure of steel finned tube, this structure is easy to deposit ash, acid corrosion, the attenuation of finned tube heat exchange coefficient is serious, the low temperature flue gas backflow makes the scaling corrosion of boiler smoke tube, cause the boiler overall efficiency to drop to about 90%, because of the boiler energy saver is installed on the upper portion of the smoke vent, once reveal, there is great potential safety hazard in the circulating water directly gets into boiler body flue gas system.
In the existing combination of the gas-fired hot water boiler and the energy saver, the exhaust gas temperature of the boiler is 180 ℃, the exhaust gas temperature of the energy saver is about 100 ℃, and the smoke loss is large. In addition, the low-temperature flue gas of the energy saver flows back to cause dewing and corrosion of boiler smoke pipes and severe scaling to cause reduction of boiler heat efficiency and increase of smoke exhaust temperature. For this reason, further improvements in the existing gas-fired hot water boiler and economizer structures are required.
SUMMERY OF THE UTILITY MODEL
In order to improve energy-conserving efficiency, avoid the flue gas backward flow to and the problem of pouring into boiler body after the circulating water is revealed, the utility model provides a flue gas waste heat recovery system of gas-fired hot water boiler sharing energy-saving appliance, concrete technical scheme is as follows.
A flue gas waste heat recovery system of a gas-fired hot water boiler sharing energy saver comprises a plurality of gas-fired hot water boilers, a counter-flow energy saver, a water supply pipeline, a water return pipeline, a smoke exhaust pipeline, a condensation water supply pipeline and a condensation water outlet pipeline, wherein each gas-fired hot water boiler is respectively connected with the water supply pipeline and the water return pipeline; the condensation water supply pipeline is connected with the countercurrent energy saver and the water return pipeline, and the condensation water outlet pipeline is connected with the countercurrent energy saver and the water supply pipeline; the upper part of the countercurrent energy saver is provided with a smoke inlet and a water outlet, the lower part of the countercurrent energy saver is provided with a smoke outlet and a water inlet, the flow directions of smoke at the smoke inlet and the smoke outlet are mutually vertical, and the countercurrent energy saver is also provided with a plurality of screwed smoke pipes.
Preferably, the gas-fired hot water boiler has 3, and the counter flow economizer has 1, and the flue gas in the counter flow economizer flows downward from above.
It is also preferred that the reverse flow economizer is disposed upstream of the induced draft fan in the direction of flow of flue gas in the flue gas duct.
It is further preferred that the flue gas in the reverse flow economizer flows along the inner threaded flue tube and the water in the reverse flow economizer flows along the casing tube.
It is further preferred that the water outlet and the smoke inlet of the countercurrent economizer are arranged oppositely, and the water inlet and the smoke outlet of the countercurrent economizer are arranged vertically.
It is further preferred that a drain pipe is arranged at the bottom of the countercurrent energy saver, and a valve is arranged on the drain pipe; and a water accumulation space is reserved at the bottom of the countercurrent energy saver.
Further preferably, the countercurrent economizer comprises a steel plate layer, a heat insulation layer and an aluminum skin layer, wherein the thickness of the steel plate layer is larger than 8mm, the thickness of the heat insulation layer is larger than 8mm, and the thickness of the aluminum skin layer is larger than 0.5 mm.
It is further preferred that the smoke inlet, the water inlet, the smoke outlet and the water outlet of the countercurrent energy-saving device are provided with detection holes, and the position of the water inlet is provided with an exhaust valve.
The utility model provides a pair of flue gas waste heat recovery system of gas-fired hot water boiler sharing energy-saving appliance's beneficial effect is, the energy-saving appliance against the current has been used in this system, the circulation of flue gas and water adopts the mode against the current, the comdenstion water that the flue gas produced at the cooling in-process flows to the energy-saving appliance bottom against the current along pipe wall and flue gas syntropy, the comdenstion water down flows and plays the effect of clean screw thread tobacco pipe simultaneously, it is stable to keep the heat transfer effect, the life of energy-saving appliance has been prolonged, the energy-saving appliance is in the smoke exhaust pipe of system in addition, the problem of low temperature flue gas backward flow has been solved, can also avoid the circulating water to reveal the back and flow the boiler.
Drawings
FIG. 1 is a schematic diagram of a flue gas waste heat recovery system;
FIG. 2 is a schematic diagram of a reverse flow economizer configuration;
FIG. 3 is a schematic diagram of a flue gas waste heat recovery system;
in the figure: 1-gas hot water boiler, 2-countercurrent economizer, 3-water supply pipeline, 4-water return pipeline, 5-smoke exhaust pipeline, 6-condensation water supply pipeline, 7-condensation water outlet pipeline, 8-smoke inlet, 9-water inlet, 10-smoke outlet and 11-water outlet.
Detailed Description
With reference to fig. 1 to 3, a detailed embodiment of a flue gas waste heat recovery system of a gas-fired hot water boiler shared economizer according to the present invention will be described.
The utility model provides a flue gas waste heat recovery system of gas boiler sharing energy-saving appliance specifically includes a plurality of gas boiler 1, energy-saving appliance 2 against current, water supply pipe 3, return water pipeline 4, exhaust pipe 5, condensation water supply pipe 6 and condensation outlet pipe way 7, a plurality of gas boiler 1 utilize the water that the gas heating comes from the water supply pipe, the flue gas gathers through exhaust pipe and discharges, thereby the safety of discharging fume of exhaust pipe 5 has been guaranteed, energy-saving appliance 2 cooperates a plurality of gas boiler to use against current, thereby greatly reduced the cost, the efficiency of flue gas waste heat recovery has still been improved simultaneously, the safety of equipment operation has been guaranteed. Each gas boiler 1 links to each other with supply channel 3 and return water pipeline 4 respectively, and supply channel 3 and return water pipeline 4 include into female pipe and the branch pipe of water and return water, and gas boiler's play tobacco pipe gathers to exhaust fume pipe 5, and energy-saving appliance 2 installs on the exhaust fume pipe against the current, inserts exhaust fume pipe 5, and the flue gas is from top to bottom flowing in 2 positions of energy-saving appliance against the current to the corruption of comdenstion water to the flue has been avoided, and the problem of flue surge. The condensation water supply pipeline 6 is connected with the countercurrent energy saver and the water return pipeline, the condensation water outlet pipeline 7 is connected with the countercurrent energy saver 2 and the water supply pipeline 3, and the countercurrent energy saver 2 utilizes water in the condensation water pipeline, so that energy conservation is realized, and the temperature of flue gas is reduced. The upper portion of energy-saving appliance 2 is provided with into mouth and delivery port against the current, the lower part is provided with outlet flue 10 and water inlet 9, the flue gas flow direction mutually perpendicular of inlet flue 8 and outlet flue 10 department, thereby the efficiency of the circulation heat transfer of rivers has been guaranteed, and flue gas temperature has effectively been controlled, the corruption of a large amount of comdenstion water to the flue has been avoided, still be provided with a plurality of screw thread tobacco pipes in the energy-saving appliance 2 against the current, stainless steel is from the cleaning energy-saving appliance replacing steel finned tube energy-saving appliance against the current, the life-span increases, energy-conserving efficiency promotes.
Wherein, 3 gas-fired hot water boilers have, 1 is the energy-saving appliance of the countercurrent, the flue gas in the energy-saving appliance of the countercurrent 2 flows from top to bottom. The condensed water that the flue gas produced at the cooling in-process flows to the department that catchments along the pipe wall with the flue gas syntropy, plays the effect of clean screw thread tobacco pipe when the condensed water flows down, maintains the screw thread tobacco pipe heat transfer coefficient simultaneously and does not attenuate, can not lead to the heat transfer effect poor because of the live time is long, can keep good heat transfer intensity, can make boiler overall efficiency remain throughout about 95%, has prolonged the life of energy-saving appliance greatly.
The countercurrent economizer 2 is connected into a smoke exhaust pipeline, so that the problem of low-temperature smoke backflow of an old economizer can be effectively solved, and circulating water is prevented from leaking and flowing backwards to the boiler body. Compared with the arrangement of a plurality of energy-saving devices, the water quantity which circulates independently is small, the flow (8-25) T/h is controlled by a single device, the temperature of outlet water is higher than 75 ℃, all circulating water entering a boiler passes through the energy-saving devices, a circulating water system is easy to adjust, and the circulation is facilitated.
The countercurrent economizer 2 is arranged at the upstream of the induced draft fan along the flow direction of the flue gas in the smoke exhaust pipeline, so that the flow of the flue gas is ensured. The flue gas in the countercurrent economizer 2 flows along the inner threaded smoke pipe, and the water in the countercurrent economizer 2 flows along the shell pipe. The water outlet 11 and the smoke inlet of the countercurrent energy saver are oppositely arranged, and the water inlet and the smoke outlet of the countercurrent energy saver are vertically arranged. A drain pipe is arranged at the bottom of the countercurrent energy saver, and a valve is arranged on the drain pipe; and a water accumulation space is reserved at the bottom of the countercurrent energy saver, so that the drainage of condensed water is facilitated.
In addition, the countercurrent economizer 2 is provided with a steel plate layer, a heat preservation layer and an aluminum skin layer, the thickness of the steel plate layer is larger than 8mm, a steel plate with the thickness of 10mm can be selected, the thickness of the heat preservation layer is larger than 8mm, the heat preservation layer can be made of aluminum silicate heat preservation cotton with the thickness of 10mm, the thickness of the aluminum skin layer is larger than 0.5mm, and the aluminum skin layer wraps the countercurrent economizer. The threaded smoke pipe is made of ND steel, the diameter of the threaded smoke pipe is generally 20mm, and the designed service life of the threaded smoke pipe is longer than 6 years. The inlet, water inlet, outlet and the delivery port department of energy-saving appliance are provided with the inspection hole against the current, can respectively set up 2 diameter 500 mm's inspection holes, and convenient maintenance is examined and repaired, and the position of water inlet is equipped with the exhaust valve, guarantees the operation of equipment.
On the basis of the structure of the flue gas waste heat recovery system of the gas-fired hot water boiler 1 sharing an economizer, the beneficial effects of the flue gas waste heat recovery system are explained through the construction and reconstruction of a certain heat exchange station. Wherein, 3 gas-fired hot water boiler are equipped with the economizer respectively before reforming transform, and its recovery heat energy efficiency: the smoke temperature difference (180 ℃→ 100 ℃) was calculated to be about 3.3%. After the improvement, 1 countercurrent economizer is shared to recover heat energy efficiency: the smoke temperature difference (180 ℃→ 65 ℃) was calculated to be about 5.3%. And (3) recovering the cost: 400 ten thousand cubes are consumed in the year, and the original 400 ten thousand cubes 3 yuan/cube 3.3% is 39.6 ten thousand; after transformation, 400 ten thousand cubic 3 yuan/cubic 5.3 percent to 63.6 ten thousand; the recovery efficiency of the energy saver is about 2% higher than that of the original energy saver by an economic comparison scheme, and the economic benefit is improved by 35 ten thousands.
The system uses a counter-flow energy saver, the circulation of smoke and water adopts a counter-flow mode, condensed water generated in the cooling process of the smoke flows to the bottom of the counter-flow energy saver along the pipe wall in the same direction as the smoke, the condensed water flows downwards and plays a role in cleaning a threaded smoke pipe, the heat exchange effect is kept stable, the service life of the energy saver is prolonged, in addition, the energy saver solves the problem of low-temperature smoke backflow in a smoke exhaust pipeline of the system, and the backflow boiler can be prevented after the circulating water is leaked.
Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and the changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also belong to the protection scope of the present invention.
Claims (8)
1. A flue gas waste heat recovery system of a gas-fired hot water boiler shared energy saver is characterized by comprising a plurality of gas-fired hot water boilers, a counter-flow energy saver, a water supply pipeline, a water return pipeline, a smoke exhaust pipeline, a condensation water supply pipeline and a condensation water outlet pipeline, wherein each gas-fired hot water boiler is respectively connected with the water supply pipeline and the water return pipeline; the condensation water supply pipeline is connected with the countercurrent energy saver and the water return pipeline, and the condensation water outlet pipeline is connected with the countercurrent energy saver and the water supply pipeline; the upper part of the countercurrent energy saver is provided with a smoke inlet and a water outlet, the lower part of the countercurrent energy saver is provided with a smoke outlet and a water inlet, the flow directions of smoke at the smoke inlet and the smoke outlet are mutually vertical, and the countercurrent energy saver is also provided with a plurality of screwed smoke pipes.
2. The system for recovering waste heat from flue gas of a gas-fired hot water boiler sharing economizer of claim 1, wherein the gas-fired hot water boiler has 3, and the counter flow economizer has 1, and flue gas in the counter flow economizer flows downward from above.
3. The system for recovering waste heat from flue gas of a gas-fired hot water boiler sharing economizer of claim 1, wherein the reverse flow economizer is disposed upstream of the induced draft fan in a flow direction of flue gas in the flue gas discharging pipe.
4. The system for recovering waste heat from flue gas of a gas-fired hot water boiler common economizer of claim 1, wherein the flue gas in the reverse flow economizer flows along an inner threaded flue tube, and the water in the reverse flow economizer flows along a shell tube.
5. The system for recovering waste heat from flue gas of a gas-fired hot water boiler sharing economizer of claim 4, wherein the water outlet and the smoke inlet of the reverse flow economizer are arranged oppositely, and the water inlet and the smoke outlet of the reverse flow economizer are arranged vertically.
6. The system for recovering the waste heat of the flue gas of the gas-fired hot water boiler sharing economizer as claimed in claim 4, wherein a drain pipe is arranged at the bottom of the countercurrent economizer, and a valve is arranged on the drain pipe; and a water accumulation space is reserved at the bottom of the countercurrent energy saver.
7. The flue gas waste heat recovery system of the gas-fired hot water boiler common economizer according to claim 4, wherein the counter flow economizer comprises a steel plate layer, a heat preservation layer and an aluminum skin layer, the thickness of the steel plate layer is larger than 8mm, the thickness of the heat preservation layer is larger than 8mm, and the thickness of the aluminum skin layer is larger than 0.5 mm.
8. The system for recovering the waste heat of the flue gas of the gas-fired hot water boiler common economizer according to claim 1, wherein the smoke inlet, the water inlet, the smoke outlet and the water outlet of the counter flow economizer are provided with detection holes, and the position of the water inlet is provided with an exhaust valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120637266.2U CN214619653U (en) | 2021-03-30 | 2021-03-30 | Flue gas waste heat recovery system of gas-fired hot water boiler sharing economizer |
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| CN202120637266.2U CN214619653U (en) | 2021-03-30 | 2021-03-30 | Flue gas waste heat recovery system of gas-fired hot water boiler sharing economizer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114264073A (en) * | 2021-12-29 | 2022-04-01 | 北京华源泰盟节能设备有限公司 | Preheating system with multiple parallel boilers and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114264073A (en) * | 2021-12-29 | 2022-04-01 | 北京华源泰盟节能设备有限公司 | Preheating system with multiple parallel boilers and control method thereof |
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