CN212962194U

CN212962194U - Ultralow nitrogen normal pressure hot water boiler

Info

Publication number: CN212962194U
Application number: CN202021939089.5U
Authority: CN
Inventors: 裴韩佶
Original assignee: Yangzhou Star Boiler Co ltd
Current assignee: Yangzhou Star Boiler Co ltd
Priority date: 2020-09-08
Filing date: 2020-09-08
Publication date: 2021-04-13
Anticipated expiration: 2030-09-08

Abstract

The utility model discloses an ultra-low nitrogen ordinary pressure hot water boiler, cylinder pot shell including vertical setting, central authorities are equipped with the combustion chamber in the pot shell, the combustor is installed at the pot shell top, combustor flame spout intercommunication is to the top center of combustion chamber, combustion chamber bottom intercommunication has the chamber of backflowing, combustion chamber upper portion is equipped with the smoke box, the periphery equipartition of combustion chamber has the tobacco pipe, tobacco pipe lower extreme and chamber of backflowing intercommunication, upper end and last smoke box intercommunication, the inner wall and the combustion chamber of pot shell, the chamber of backflowing, form the water cavity between the outer wall of last smoke box, the tobacco pipe internal surface is equipped with interior fin, interior fin is along the even annular distribution of tobacco pipe internal surface. The utility model discloses an ultralow nitrogen ordinary pressure hot water boiler can show and improve boiler body thermal efficiency, dwindles boiler overall dimension simultaneously for boiler structure is compacter and pleasing to the eye, simultaneously greatly reduced user initial investment cost.

Description

Ultralow nitrogen normal pressure hot water boiler

Technical Field

The utility model relates to a hot water boiler, in particular to ultra-low nitrogen normal pressure hot water boiler.

Background

At present, the traditional normal pressure hot water boiler is composed of a combustor, a combustion chamber and a water cavity. The combustor mainly ignites fuel and provides enough air, the combustion chamber burns the ignited fuel and the air to convert into heat, and the water cavity transfers high-temperature heat generated in the combustion process of the combustion chamber to low-temperature water to increase the temperature of the water. The efficiency of the boiler is mainly determined by the structure and the heating area of the water cavity.

The hot water boiler can be divided into a vertical type, a horizontal type and the like according to arrangement types. In comparison, the vertical hot water boiler saves space and has relatively low cost; the horizontal hot water boiler occupies a large area and has relatively high cost. However, since the vertical hot water boiler has a larger heating area than the horizontal hot water boiler and has a higher thermal efficiency than the horizontal hot water boiler, the horizontal hot water boiler is still more expensive but still more popular in the market, and particularly, the horizontal hot water boiler is basically of a horizontal structure. Therefore, in order to improve the market competitiveness of the vertical hot water boiler, it is necessary to improve the thermal efficiency of the vertical hot water boiler. In order to solve the problem, the smoke tube of a part of vertical hot water boiler adopts a finned tube or threaded tube structure, so that the overall dimension of the boiler is increased although the heat efficiency is improved to a certain degree, and the initial investment cost of a user is increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an ultralow nitrogen ordinary pressure boiler reaches the purpose of increasing the heat efficiency when keeping vertical boiler and sparingly taking up an area of the space advantage.

The purpose of the utility model is realized like this: the utility model provides an ultralow nitrogen ordinary pressure hot water boiler, including the cylinder pot shell of vertical setting, central authorities are equipped with the combustion chamber in the pot shell, the combustor is installed at the pot shell top, combustor flame spout intercommunication to the top center of combustion chamber, combustion chamber bottom intercommunication has the chamber of backflowing, combustion chamber upper portion is equipped with the smoke chamber, the periphery equipartition of combustion chamber has the tobacco pipe, tobacco pipe lower extreme and the chamber of backflowing intercommunication, upper end and last smoke chamber intercommunication, the inner wall and the combustion chamber of pot shell, the chamber of backflowing, form the water cavity between the outer wall of last smoke chamber, the tobacco pipe internal surface is equipped with interior fin, interior fin is along the even annular distribution of tobacco pipe internal surface.

The utility model discloses an ultralow nitrogen ordinary pressure hot water boiler, through adopting the design of the interior fin tobacco pipe that has the extension heated surface, can make boiler convection heat transfer area increase 60% with the ratio fluorescent tube, the flue gas flow cross-sectional area reduces 17.6%, body efficiency increases about 9%, can thoroughly change the appearance image that traditional boiler size is bigger than normal from this, and the flue gas is after combustion chamber radiation heat transfer and the high temperature heat transfer of flashback chamber, end first return heat transfer, then turn to and get into interior fin tobacco pipe, make hot flue gas and interior fin tobacco pipe carry out abundant heat transfer once more, accomplish and arrange to the chimney behind the second return heat transfer, the exhaust fume temperature of final boiler reduces to within 130 ℃, body design thermal efficiency is up to 92%. To sum up, the utility model discloses an ultralow nitrogen ordinary pressure hot water boiler can show improvement boiler body thermal efficiency, dwindles boiler overall dimension simultaneously for boiler structure is compacter and pleasing to the eye, simultaneously greatly reduced user initial investment cost.

As a further improvement of the utility model, the inner fins are parallel to the axis of the smoke tube and are integrally formed with the smoke tube, and the side surfaces of the inner fins are connected with the top surface of the inner fins and the inner surface of the smoke tube in a smooth transition manner, so that the smoke tube is simple to manufacture and reliable and durable.

As a further improvement, the inner rib segment is trapezoidal, the forming is convenient, the stability is good, the residence time of the smoke in the smoke tube is prolonged, and the effect of enhancing heat exchange is achieved.

As a further improvement of the utility model, tobacco pipe outside diameter phi satisfies 45mm and is less than or equal to phi and is less than or equal to 55mm, interior fin root interval D satisfies 4mm and is less than or equal to D and is less than or equal to 6mm, interior fin root width W1 satisfies 3mm and is less than or equal to W1 and is less than or equal to 5mm, interior fin top width W2 satisfies 1.5mm and is less than or equal to W2 and is less than or equal to 2.5mm, interior fin height H satisfies 5mm and is less than or equal to H and is less than or equal to 7mm, in order to reach the heat transfer effect of preferred, can make boiler.

As the utility model discloses a further improvement, tobacco pipe outside diameter phi =51mm, tobacco pipe thickness are 3mm, and interior fin root interval D =5mm, interior fin root width W1=4mm, interior fin top width W2=2mm, interior fin height H =6mm to reach best heat transfer effect.

As a further improvement of the utility model, the burner adopts an internal combustion cylinder ultra-low nitrogen burner. In the whole operation process of the boiler, the ultra-low nitrogen combustor of the internal combustion cylinder automatically adjusts the air and fuel ratio according to the oxygen content in the flue gas, and timely controls the ultra-low nitrogen emission of the NOx in the flue gas of the boiler, thereby finally realizing low-nitrogen high-efficiency energy conservation.

As a further improvement of the utility model, the top of the pot shell is provided with a water outlet pipe seat, the bottom side of the pot shell is provided with a water return pipe seat, and the water outlet pipe seat and the water return pipe seat are communicated with the water cavity. Through the structure of going in and out from top to bottom, the heat exchange effect is enhanced.

Drawings

Fig. 1 is a schematic structural view of the ultra-low nitrogen atmospheric pressure hot water boiler of the present invention.

FIG. 2 is a schematic view showing the cross-sectional structure of the flue of the ultra-low nitrogen atmospheric pressure hot water boiler of the present invention.

Fig. 3 is a partially enlarged view of fig. 2.

Wherein, 1 pot shell, 2 combustion chambers, 3 burners, 4 combustion chambers, 5 upper smoke chambers, 6 smoke pipes, 7 water cavities, 8 water outlet pipe seats, 9 water return pipe seats and 10 inner fins.

Detailed Description

The ultra-low nitrogen normal pressure hot water boiler shown in figure 1 comprises a vertically arranged cylindrical boiler shell 1, wherein a combustion chamber 2 is arranged in the center of the boiler shell 1, a burner 3 is installed at the top of the boiler shell 1, a flame nozzle of the burner 3 is communicated to the center of the top of the combustion chamber 2, a combustion chamber 4 is communicated with the bottom of the combustion chamber 2, an upper smoke chamber 5 is arranged at the upper part of the combustion chamber 2, smoke pipes 6 are uniformly distributed at the periphery of the combustion chamber 2, the lower ends of the smoke pipes 6 are communicated with the combustion chamber 4, the upper ends of the smoke pipes are communicated with the upper smoke chamber 5, and a water cavity 7 is formed between the inner wall of the boiler shell 1 and the outer walls of the combustion chamber 2, the combustion. The top of the boiler shell 1 is provided with a water outlet pipe seat 8, the bottom side of the boiler shell 1 is provided with a water return pipe seat 9, and the water outlet pipe seat 8 and the water return pipe seat 9 are communicated with the water cavity 7.

As shown in fig. 2 and 3, the inner surface of the smoke tube 6 of the present embodiment is provided with inner fins 10, and the inner fins 10 are uniformly and annularly distributed along the inner surface of the smoke tube 6. The inner fins 10 are parallel to the axis of the smoke tube 6, the inner fins 10 are integrally formed with the smoke tube 6, and the side surfaces of the inner fins 10 are connected with the top surfaces of the inner fins 10 and the inner surface of the smoke tube 6 in a smooth transition manner. The diameter phi of the outer part of the smoke tube 6 is more than or equal to 45mm and less than or equal to 55mm, the thickness of the smoke tube 6 is 3mm, and the interval D of the roots of the inner fins 10 is more than or equal to 4mm and less than or equal to 6 mm. The cross section of the inner fin 10 is trapezoidal, the width W1 of the root part of the inner fin 10 meets the requirement that the width W1 is not less than 3mm and not more than 5mm, the width W2 of the top part of the inner fin 10 meets the requirement that the width W2 is not less than 1.5mm and not more than 2.5mm, and the height H of the inner fin 10 meets the requirement that the width H is not less than 5mm and not more than H and not more than 7mm, so that the internal structure of the boiler is more compact while a better heat exchange. In this embodiment, the outer diameter of the smoke tube 6 is phi =51mm, the thickness of the smoke tube 6 is 3mm, the interval between the roots of the inner fins 10 is D =5mm, the width W1 of the roots of the inner fins 10 is =4mm, the width W2 of the top of the inner fins 10 is =2mm, and the height H =6mm of the inner fins 10.

The burner 3 is preferably an internal combustion cylinder ultra-low nitrogen burner. The ultra-low nitrogen burner of the internal combustion cylinder adopts a unique small hole cross combustion technology: after mixed air and fuel are sent to a mixing box through an air blower, the air and the fuel are fully mixed and then are sent out through an air distribution plate, an air distribution cylinder, an air distribution plate and uniform small holes (uniform long-strip-shaped air supply holes) on the air distribution cylinder, so that the air and the fuel can better meet the requirement of full-premix combustion, then the mixed gas passes through a small pore plate at a specific flow rate, a mixed cross combustion structure is formed after the mixed gas is sent out through the air distribution holes, flames are vertically pushed forwards through the air distribution plate and are crossly combusted again with flames of the circumferential combustion of the air distribution cylinder, cross stereoscopic net-shaped combustion is formed, after primary (vertical forward of the air distribution plate), secondary (circumferential inward of the uniform air cylinder) and tertiary (vertical and circumferential cross) full combustion, formed blue flames are sent into a boiler combustion chamber, and finally NO of the boiler is fully combusted_XThe emission concentration drops below 30mg/Nm 3. The combustion control system adopts a frequency conversion electronic ratio adjusting mode, and air inlet adopts a Venturi structure. The cylindrical structure has the characteristics of high temperature resistance, long service life, simplicity in manufacture, low manufacturing cost, stability in combustion, low combustion maintenance cost and the like, and can effectively achieve the purposes of low nitrogen, environment protection and energy conservation.

The flow of the flue gas of the ultralow-nitrogen atmospheric-pressure hot-water boiler in the embodiment is shown by a hollow arrow in fig. 1, and the flow of the medium (water) is shown by a solid arrow in fig. 1, specifically as follows:

flue gas flow: fuel → burner → combustion chamber → recombustion chamber → convection bank of inner finned flue pipe → upper smoke chamber → smoke outlet.

The medium flow comprises the following steps: softened water supply → water tank → circulating pump → backwater pipe seat → water cavity → water outlet pipe seat → water diversion tank → hot user.

The ultralow-nitrogen normal-pressure hot water boiler disclosed by the embodiment adopts the design of the inner fin 10 smoke tube 6 with the expanded heating surface, the convection heat transfer area of the boiler can be increased by 60% compared with that of a light tube, the flow cross section of smoke is reduced by 17.6%, and the body efficiency is increased by about 9%, so that the appearance image of the traditional boiler with larger size can be thoroughly changed, the smoke is subjected to radiation heat transfer in the combustion chamber 2 and high-temperature heat transfer in the flashback chamber 4, the first return heat transfer is finished, then the smoke is turned to enter the inner fin 10 smoke tube 6, the hot smoke and the inner fin 10 smoke tube 6 perform sufficient heat transfer again, the smoke is discharged to a chimney after the second return heat transfer is finished, finally the smoke discharge temperature of the boiler is reduced to within 130 ℃, and. In the whole operation process of the boiler, the ultra-low nitrogen combustor of the internal combustion cylinder automatically adjusts the air and fuel ratio according to the oxygen content in the flue gas, and timely controls the ultra-low nitrogen emission of the NOx in the flue gas of the boiler, thereby finally realizing low-nitrogen high-efficiency energy conservation.

The present invention is not limited to the above embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some replacements and transformations for some technical features without creative labor according to the disclosed technical contents, and these replacements and transformations are all within the protection scope of the present invention.

Claims

1. The utility model provides an ultralow nitrogen ordinary pressure hot water boiler, includes the cylinder pot shell of vertical setting, central authorities are equipped with the combustion chamber in the pot shell, the combustor is installed at the pot shell top, combustor flame spout intercommunication extremely the top center of combustion chamber, combustion chamber bottom intercommunication has the chamber of backflowing, combustion chamber upper portion is equipped with the smoke box, the periphery equipartition of combustion chamber has the tobacco pipe, tobacco pipe lower extreme and the chamber of backflowing intercommunication, upper end and last smoke box intercommunication, the inner wall of pot shell with form water cavity, its characterized in that between the outer wall of combustion chamber, chamber of backflowing, last smoke box: the inner surface of the smoke tube is provided with inner fins which are uniformly and annularly distributed along the inner surface of the smoke tube.

2. An ultra-low nitrogen atmospheric pressure hot water boiler according to claim 1, characterized in that: the inner fins are parallel to the axis of the smoke tube and are integrally formed with the smoke tube, and the side surfaces of the inner fins are connected with the top surfaces of the inner fins and the inner surface of the smoke tube in a smooth transition mode.

3. The ultra-low nitrogen atmospheric pressure hot water boiler according to claim 2, characterized in that: the inner rib segment is trapezoidal in shape.

4. An ultra-low nitrogen atmospheric pressure hot water boiler according to claim 3, characterized in that: the diameter phi of the outer part of the smoke tube is more than or equal to 45mm and less than or equal to 55mm, the interval D of the roots of the inner fins is more than or equal to 4mm and less than or equal to 6mm, the width W1 of the roots of the inner fins is more than or equal to 3mm and less than or equal to W1 and less than or equal to 5mm, the width W2 of the tops of the inner fins is more than or equal to 1.5mm and less than or equal to W2 and less than or equal to 2.5mm, and the.

5. An ultra-low nitrogen atmospheric pressure hot water boiler according to claim 4, characterized in that: the diameter phi of the outer portion of the smoke tube is =51mm, the thickness of the smoke tube is 3mm, the interval D of the roots of the inner ribs is =5mm, the width W1 of the roots of the inner ribs is =4mm, the width W2 of the tops of the inner ribs is =2mm, and the height H of the inner ribs is =6 mm.

6. An ultra-low nitrogen atmospheric pressure hot water boiler according to any one of claims 1 to 5, characterized in that: the combustor adopts an inner combustion cylinder ultra-low nitrogen combustor.

7. An ultra-low nitrogen atmospheric pressure hot water boiler according to any one of claims 1 to 5, characterized in that: the top of the boiler shell is provided with a water outlet pipe seat, the bottom side of the boiler shell is provided with a water return pipe seat, and the water outlet pipe seat and the water return pipe seat are communicated with the water cavity.