CN2363227Y

CN2363227Y - High-efficient energy-saving natural gas boiler

Info

Publication number: CN2363227Y
Application number: CN 98233137
Authority: CN
Inventors: 吴仰天
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-11-11
Filing date: 1998-11-11
Publication date: 2000-02-09
Anticipated expiration: 2008-11-11

Abstract

The utility model relates to a high-efficient energy-saving natural gas boiler which comprises a burner, a burning chamber, a hearth, a convection heating surface and a boiler shell. The utility model has the structural characteristics that a spray head of the burner is arranged on a position along a tangential direction of the inner wall of the burning chamber. A smoke discharging pipeline is connected with a heat exchanger which is arranged at the outside above the boiler shell, a smoke discharging opening and a water intake pipe are arranged in the heat exchanger, and the radial direction of the water intake pipe facing to a smoke gas leading into side is provided with multiple rows of small holes in which the smoke gas can be sprayed. When the boiler burns, intake water and the smoke gas can directly carry out heat exchange. The utility model has the characteristics of simple structure, easy manufacture and low production cost. Smoke discharging temperature can be reduced between 25 DEG C to 75 DEG C, and thermal efficiency is enhanced by more than 100%.

Description

Special efficacy energy-saving natural gas boiler

The utility model relates to field of boilers, particularly uses the boiler of natural gas as fuel, is applicable to the hot water that production is not high to the water quality requirements.

The structure of industry at present or domestic gas hot-water boiler, no matter be the backhaul of flue gas list, two return, still develop into the smoke three-pass that more extensively adopts today, one of purpose that it is main is exactly the flue gas flow that extends, the time of staying of prolong smoke in body of heater increases heating surface, increases the heat exchange amount, reduce exhaust gas temperature, to improve the thermal efficiency of boiler.Its exhaust gas temperature of existing gas fired-boiler is high about about 200 ℃, low about about 150 ℃, had very much progress than old-fashioned boiler.But according to this thinking, want further to improve boiler thermal output, then must further work hard on the increase heating surface.Can make boiler structure more complicated like this, increase manufacture difficulty, production cost also can continue to increase.

At problems of the prior art, goal of the invention of the present utility model provides the energy-conservation natural gas boiler of a kind of production cost special efficacy low, easy to manufacture, simple in structure.It can make its exhaust gas temperature reduce between 25 ℃～75 ℃, and the thermal efficiency improves more than 100%.

In order to reach above-mentioned goal of the invention, the technical solution of the utility model realizes as follows: special efficacy energy-saving natural gas boiler comprises the indispensable annex of burner, combustion chamber, burner hearth, convection heating surface, boiler shell, smoke discharging pipe and boiler.Its design feature is that the shower nozzle of described burner is installed in the tangential direction position along the combustion chamber inwall, and the thermal-flame of ejection is rotated along the combustion chamber inner chamber.The heat exchanger that install by elbow and boiler shell upper outer the top of smoke discharging pipe is connected.Top in the heat exchanger is provided with exhaust opening and water inlet pipe.The bottom of water inlet pipe blocks and at sagittal plane flue gas is fed side and offers the aperture that many rows can spray water.The bottom design of heat exchanger is a cone, and cone is connected with the middle part of boiler shell by connecting leg again, and the middle and upper part of boiler shell is provided with outlet pipe.

Into water and flue gas heat exchange are abundant in order to make, and according to above-mentioned technical scheme, the shaped upper part of described heat exchanger is for making the scroll casing shape of flue gas spiral rotation.

The utility model is owing to adopted shower nozzle with burner to be installed in tangential direction position along the combustion chamber inwall, and the thermal-flame that makes ejection rises in the shape of a spiral, thereby increased flue gas flow along the rotation of combustion chamber inner chamber, makes thermal-flame reach complete after-flame.With the boiler shell upper outer heat exchanger is installed in addition above smoke discharging pipe, when flue gas entered heat exchanger, water inlet was sprayed simultaneously thereupon, directly absorbed the heat of flue gas.Water inlet and flue gas flow down in the cone that accumulates in the bottom along the outer wall of heat exchanger.Cone is by the theoretical design of stoke's Si cyclone body, and with the control of the boiler water level water level of keeping certain height, also remain certain velocity head when making flue gas rotate to the water surface, can continue rotation at the water surface and stir, the cooling of heat exchange once again back oppositely cycle exhaust opening enters atmosphere.Because adopted flue gas and water inlet direct contact heat transfer, thereby made flue-gas temperature almost can reduce to the level identical with inflow temperature, between promptly 25 ℃～75 ℃, the thermal efficiency of corresponding boiler improves more than 100%, and the pollution control of atmosphere is had positive role.Compare with prior art, have characteristics simple in structure, reasonable in design, easy to manufacture, that production cost is low, the value of extensive popularization and use is arranged.

Below in conjunction with accompanying drawing and concrete embodiment the utility model is further described.

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is that the A-A of Fig. 1 is to cutaway view;

Fig. 3 is that the B-B of Fig. 1 is to cutaway view.

Referring to Fig. 1～Fig. 3, special efficacy energy-saving natural gas boiler comprises the indispensable annex of burner 1, combustion chamber 2, burner hearth 3, convection heating surface 4, boiler shell 6, smoke discharging pipe 8 and boiler.The shower nozzle of described burner 1 is installed in the tangential direction position of (2) inwall along the combustion chamber.The heat exchanger 12 that install by elbow 9 and boiler shell 6 upper outer the top of smoke discharging pipe 8 is connected.The shaped upper part of heat exchanger 12 wherein is provided with exhaust opening 11 and water inlet pipe 10 for making the volute body of flue gas spiral rotation.The bottom of water inlet pipe 10 blocks and at sagittal plane flue gas is fed side and offers the aperture that many rows can spray water.The bottom of heat exchanger 12 is made as cone 13, and cone 13 is connected by the middle part of connecting leg 14 with boiler shell 6 again.The middle and upper part of boiler shell 6 is provided with outlet pipe 5, and its upper end is provided with blast pipe 7.

When using the utility model, in boiler shell 6, inject a certain amount of water, ignition then earlier, by burner 1 along the combustion chamber 2 tangential ejection thermal-flames, and, rise in the shape of a spiral with the 2 inner chambers rotation in the combustion chamber at a high speed, increased flue gas flow, made thermal-flame reach complete after-flame.When the high-temperature flue gas of after-flame screws in burner hearth, carry out on the one hand and the general identical radiant heat transfer of boiler, make boiler that stronger convection heat transfer' heat-transfer by convection be arranged owing to wash away flue at a high speed on the other hand.Enter afterwards hot heating surface 4, carry out the sufficient heat exchange backlash in this district and go out boiler shell 6 tops, at this moment the cigarette temperature is approximately reduced to about 200 ℃.At this moment low-temperature flue gas is introduced in the heat exchanger 12 with the flow velocity of about 12m/s by elbow 9 through smoke discharging pipe 8 again.When flue gas enters heat exchanger 12, open water inlet pipe 10, water inlet feeds side by its radially set aperture to flue gas and sprays.Water inlet and flue gas be along the rotation of the scroll casing shape outer wall of heat exchanger 12, makes water into directly absorb the heat of flue gas.Flow in its underpart cone 9 along heat exchanger 12 outer walls then, and with the control of the boiler water level water level of keeping certain height, also remain certain velocity head when making flue gas rotate to the water surface, continue rotation at the water surface and stir, the cooling of heat exchange once again back screws in exhaust opening 11 and enters atmosphere.Certainly, adopt water inlet directly to contact heat absorption with flue gas, the CO in the flue gas ₂Can dissolve in the water, make water be faintly acid.But the chemical tendering water as feedwater generally has enough basicity, can in and the acidity of water.On the other hand, according to gas dissolving law as can be known, CO ₂The solubility of gas in the water partial pressure of gas on gas-water interface therewith is directly proportional.When in uncovered equipment water temperature being raise, the steam partial pressure on the gas-water interface increases, CO ₂Gas partial pressure reduces, when water temperature is raised to 70～80 ℃ of levels, and CO ₂Gas can be separated in complete desorb.When water temperature reaches certain temperature, CO ₂Gas is promptly emitted fully from set blast pipe 7.Take necessary anti-corrosion measure can reach every index of water fully at heat exchanger 12 inwalls and boiler shell 6 inwalls in addition.

Claims

1. special efficacy energy-saving natural gas boiler, it comprises burner (1), combustion chamber (2), burner hearth (3), convection heating surface (4), boiler shell (6), the indispensable annex of smoke discharging pipe (8) and boiler, it is characterized in that, the shower nozzle of described burner (1) is installed in the tangential direction position of (2) inwall along the combustion chamber, can make thermal-flame (2) inner chamber rotation of ejection along the combustion chamber, the heat exchanger (12) that install by elbow (9) and boiler shell (6) upper outer the top of smoke discharging pipe (8) is connected, top in the heat exchanger (12) is provided with exhaust opening (11) and water inlet pipe (10), the bottom of water inlet pipe (10) blocks and at sagittal plane flue gas is fed side and offers the aperture that many rows can spray water, the bottom of heat exchanger (12) is made as cone (13), cone (13) is connected by the middle part of connecting leg (14) with boiler shell (6) again, and the middle and upper part of boiler shell (6) is provided with outlet pipe (5).

2. according to the described special efficacy energy-saving natural gas of claim 1 boiler, it is characterized in that the shaped upper part of described heat exchanger (12) is for making the scroll casing shape of flue gas spiral rotation.

3. according to claim 1 or 2 described special efficacy energy-saving natural gas boilers, it is characterized in that the upper end of described boiler shell (6) is provided with blast pipe (7).