CN210892173U

CN210892173U - Condensation energy-saving low-nitrogen-emission gas normal-pressure heating boiler

Info

Publication number: CN210892173U
Application number: CN201921943684.3U
Authority: CN
Inventors: 柴俊彦; 郭啟明; 杨春江
Original assignee: Shaanxi Huowang Energy Science & Technology Co ltd
Current assignee: Shaanxi Huowang Energy Science & Technology Co ltd
Priority date: 2019-11-12
Filing date: 2019-11-12
Publication date: 2020-06-30
Anticipated expiration: 2029-11-12

Abstract

The utility model belongs to the technical field of normal pressure gas-fired boilers, and relates to a condensing energy-saving low-nitrogen emission gas normal pressure heating boiler, which comprises a boiler body and a boiler chimney, wherein a flue gas condensing device is arranged between a rear tube plate of the boiler body and the boiler chimney; the flue gas condensing device comprises a shell, a shell sealing plate, a flue gas diversion heat exchange water jacket, a serpentine tube group, a shunt tube and a smoke exhaust outlet; the flue gas water conservancy diversion heat transfer water jacket, serpentine tube group all set up in the space in the shell, and boiler body lower extreme is provided with the water inlet, and the water inlet communicates with flue gas water conservancy diversion heat transfer water jacket's lower extreme, and flue gas water conservancy diversion heat transfer water jacket upper end communicates with serpentine tube group's upper end, and serpentine tube group's lower extreme is connected with distributive pipe one end, and the other end of distributive pipe is worn out the shell shrouding and is communicate with heating system's low temperature return water pipeline outward, and the lower part of shell shrouding is provided with the export. The utility model discloses a reverse heat transfer of hot cold fluid increases the energy-conserving low nitrogen emission efficiency of condensation.

Description

Condensation energy-saving low-nitrogen-emission gas normal-pressure heating boiler

Technical Field

The utility model belongs to the technical field of the ordinary pressure gas boiler, a condensation energy-conserving low nitrogen discharges gas ordinary pressure heating boiler is related to.

Background

The natural gas and air are mixed and combusted to generate water vapor which accounts for about 28% of the total amount of the discharged smoke of the boiler, and in order to prevent the water vapor in the smoke from condensing to corrode a flue and equipment, the discharged smoke temperature of the existing shell type gas-fired boiler is higher than the dew point temperature of the smoke so as to ensure that the water vapor in the smoke is not condensed. Therefore, about 15% of heat loss is formed, and a certain amount of nitrogen oxide and sulfur dioxide pollutants are discharged into the atmosphere to pollute the environment.

In order to improve the heat efficiency and the environmental protection performance of the boiler, the adoption of a flue gas condensation technology is a very effective important measure.

The existing gas boiler flue gas condensation technology has the following defects:

(1) the heat exchanger is arranged at the middle section of the chimney (flue), and hot flue gas can reach the heat exchanger after flowing through the chimney for a certain distance, so that certain heat dissipation loss is caused.

(2) When the heat exchanger is arranged on a vertical chimney with upward flowing flue gas, the heat exchanger has low efficiency due to relatively small temperature difference between hot and cold fluids (compared with the downward flowing flue gas), high flue gas velocity and small temperature gradient change; and is not beneficial to the discharge and recovery of the condensed water.

(3) The condensed water of the heat exchanger is easy to flow to the horizontal flue to cause corrosion.

(4) When the heat exchanger is arranged on a vertical chimney with downward flowing smoke, the length of the chimney in front of the heat exchanger is prolonged, and the smoke flow distance is increased to cause heat dissipation loss.

(5) The single straight pipe or the single coiled pipe adopted by the heat exchange pipe of the heat exchanger can not meet the requirements of different shell shapes and heat exchange areas of the heat exchanger.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an energy-conserving low nitrogen of condensation discharges gas ordinary pressure heating boiler solves the calorific loss, heat exchanger efficiency that exist because of the structure is unreasonable to cause and hangs down, the flue corrodes the scheduling problem, has realized the energy-efficient low nitrogen of ordinary pressure gas heating boiler and has discharged efficiency.

The utility model discloses an implementation process as follows:

a condensing energy-saving low-nitrogen-emission gas normal-pressure heating boiler comprises a boiler body and a boiler chimney, wherein a flue gas condensing device is arranged between a rear tube plate of the boiler body and the boiler chimney; the flue gas condensing device comprises a shell, a shell sealing plate, a flue gas diversion heat exchange water jacket, a serpentine tube group, a shunt tube and a smoke exhaust outlet; flue gas water conservancy diversion heat transfer water jacket, serpentine tube crowd all set up in the space in the shell, boiler body lower extreme is provided with the water inlet, the water inlet passes through communicating pipe intercommunication with flue gas water conservancy diversion heat transfer water jacket's lower extreme, flue gas water conservancy diversion heat transfer water jacket upper end and serpentine tube crowd's upper end intercommunication, serpentine tube crowd's lower extreme and distributive pipe one end are connected, the other end of distributive pipe is worn out the outer low temperature return water pipeline intercommunication with heating system of shell shrouding, the lower part of shell shrouding is provided with the exhanst outlet, exhanst outlet and boiler chimney intercommunication.

Furthermore, the flue gas condensing unit is directly connected with a rear tube plate of the boiler body.

Furthermore, the rear tube plate, the shell and the smoke guide heat exchange water jacket enclose a smoke collection chamber, and the smoke guide heat exchange water jacket and the shell sealing plate, the serpentine tube group, the water distribution pipe and the outlet of the boiler chimney enclose a condensation chamber.

Further, the flue gas diversion heat exchange water jacket is vertical to or inclined with the axis of the boiler body.

Furthermore, an automatic exhaust valve is arranged at the upper end of the flue gas diversion heat exchange water jacket.

Furthermore, the serpentine tube group is composed of a plurality of serpentine tubes according to the size of the boiler.

Furthermore, acid-resistant, heat-resistant and anticorrosive paint is coated on the surface of the material in the condensation chamber except the serpentine tube group.

Furthermore, the distributive pipe is positioned at the lower part of the space in the shell, and the serpentine pipe group is positioned above the distributive pipe.

Further, a condensed water outlet for discharging condensed water is provided at the bottom of the case.

The coiled pipe is a thin-wall stainless steel coiled pipe, and the boiler body is a boiler shell type horizontal boiler.

The utility model discloses an actively the effect:

(1) flue gas condensing equipment of gas ordinary pressure heating boiler can realize the reverse heat transfer of hot cold fluid, and condensation chamber flue gas top-down flows outside the tubes promptly, and the cold flow body flows in the intraductal from bottom to top to increase the energy-conserving low nitrogen emission efficiency of condensation.

(2) The serpentine tube group is composed of thin-wall stainless steel serpentine tubes with different numbers according to the size of the boiler, and the specific size, shape and number of the serpentine tubes are matched with the device shell 7 so as to fully utilize the space in the shell.

(3) The bottom of the shell is provided with a condensed water outlet for discharging condensed water, so that the condensed water can be discharged completely and smoothly.

(4) The upper end of the flue gas diversion heat exchange water jacket is provided with an automatic exhaust valve so as to be beneficial to the discharge of gas in the coiled pipe and the water jacket.

Drawings

FIG. 1 is a right side view cross-sectional view of a flue gas condensing unit of a condensing energy-saving low-nitrogen emission gas normal pressure heating boiler

FIG. 2 is a serpentine tube of four different shape combinations;

FIG. 3 is a diagram of a flue gas flow trace, in which serpentine tube groups are omitted;

fig. 4 is a front sectional view of the flue gas condensing unit of the condensing energy-saving low-nitrogen-emission gas normal-pressure heating boiler according to the present invention;

FIG. 5 is a front view of the condensing energy-saving low-nitrogen-emission gas normal-pressure heating boiler with the outer shell removed;

in the figure, 1 boiler body, 11 back tube plate, 12 water inlet, 13 communicating tube, 2 boiler chimney, 31 shell, 311 condensed water outlet, 32 shell closing plate, 33 flue gas diversion heat exchange water jacket, 331 automatic exhaust valve, 34 serpentine tube group, 35 shunt tube, 36 smoke outlet, 4 smoke collecting chamber, 5 condensing chamber.

Detailed Description

The present invention will be further described with reference to the following examples.

In order to solve the heat loss, the heat exchanger efficiency that exist because of the structure is unreasonable to cause and descend, flue corrosion scheduling problem, realized the energy-efficient low nitrogen of ordinary pressure gas heating boiler and discharged efficiency, the utility model provides an energy-conserving low nitrogen of condensation discharges gas ordinary pressure heating boiler.

Example 1

The condensing energy-saving low-nitrogen-emission gas normal-pressure heating boiler disclosed by the embodiment is shown in fig. 1, fig. 2, fig. 4 and fig. 5, and comprises a boiler body 1 and a boiler chimney 2, wherein a flue gas condensing device is arranged between a rear tube plate 11 of the boiler body 1 and the boiler chimney 2, and the flue gas condensing device is directly connected with the rear tube plate 11 of the boiler body 1; the flue gas condensing device comprises a shell 31, a shell closing plate 32, a flue gas diversion heat exchange water jacket 33, a serpentine tube group 34, a water distribution tube 35 and a smoke exhaust outlet 36; flue gas water conservancy diversion heat transfer water jacket 33, serpentine tube bank 34 all set up in the space in

shell

31, 1 lower extreme of boiler body is provided with water inlet 12, water inlet 12 communicates through communicating pipe 13 with the lower extreme of flue gas water conservancy diversion heat transfer water jacket 33, flue gas water conservancy diversion heat transfer water jacket 33 upper end and serpentine tube bank 34's upper end intercommunication, serpentine tube bank 34's lower extreme and distributive pipe 35 one end are connected, the other end of distributive pipe 35 wears out the low temperature return water pipeline intercommunication with heating system outside shell shrouding 32, the lower part of shell shrouding 32 is provided with exhaustoutlet 36, exhaustoutlet 36 and boiler chimney 2 intercommunication. The rear tube plate 11, the shell 31 and the flue gas diversion heat exchange water jacket 33 enclose a smoke collection chamber 4, and the flue gas diversion heat exchange water jacket 33, the shell closing plate 32, the serpentine tube group 34, the distributive pipe 35 and the outlet of the boiler chimney 2 enclose a condensation chamber 5. The flue gas diversion heat exchange water jacket 33 is perpendicular to the axis of the boiler body 1, the upper end of the flue gas diversion heat exchange water jacket 33 is provided with an automatic exhaust valve 331, the serpentine tube group 34 is composed of a plurality of serpentine tubes with incompletely identical shapes according to the size of the boiler, and the serpentine tubes are thin-wall stainless steel serpentine tubes. Knock out pipe 35 is located in the lower part of the space in housing 31, and serpentine tube bundle 34 is located above knock out pipe 35. A condensed water outlet 311 for discharging condensed water is provided at the bottom of the outer case 31. The boiler body 1 is a shell-type horizontal boiler.

Example 2

The condensing energy-saving low-nitrogen-emission gas normal-pressure heating boiler comprises a boiler body 1 and a boiler chimney 2, wherein a flue gas condensing device is arranged between a rear tube plate 11 of the boiler body 1 and the boiler chimney 2; the flue gas condensing device comprises a shell 31, a shell closing plate 32, a flue gas diversion heat exchange water jacket 33, a serpentine tube group 34, a water distribution tube 35 and a smoke exhaust outlet 36; flue gas water conservancy diversion heat transfer water jacket 33, serpentine tube bank 34 all set up in the space in

shell

31, 1 lower extreme of boiler body is provided with water inlet 12, water inlet 12 communicates through communicating pipe 13 with the lower extreme of flue gas water conservancy diversion heat transfer water jacket 33, flue gas water conservancy diversion heat transfer water jacket 33 upper end and serpentine tube bank 34's upper end intercommunication, serpentine tube bank 34's lower extreme and distributive pipe 35 one end are connected, the other end of distributive pipe 35 wears out the low temperature return water pipeline intercommunication with heating system outside shell shrouding 32, the lower part of shell shrouding 32 is provided with exhaustoutlet 36, exhaustoutlet 36 and boiler chimney 2 intercommunication.

Example 3

The condensing energy-saving low-nitrogen-emission gas normal-pressure heating boiler comprises a boiler body 1 and a boiler chimney 2, wherein a flue gas condensing device is arranged between a rear tube plate 11 of the boiler body 1 and the boiler chimney 2 and is directly connected with the rear tube plate 11 of the boiler body 1; the flue gas condensing device comprises a shell 31, a shell closing plate 32, a flue gas diversion heat exchange water jacket 33, a serpentine tube group 34, a water distribution tube 35 and a smoke exhaust outlet 36; flue gas water conservancy diversion heat transfer water jacket 33, serpentine tube bank 34 all set up in the space in

shell

31, 1 lower extreme of boiler body is provided with water inlet 12, water inlet 12 communicates through communicating pipe 13 with the lower extreme of flue gas water conservancy diversion heat transfer water jacket 33, flue gas water conservancy diversion heat transfer water jacket 33 upper end and serpentine tube bank 34's upper end intercommunication, serpentine tube bank 34's lower extreme and distributive pipe 35 one end are connected, the other end of distributive pipe 35 wears out the low temperature return water pipeline intercommunication with heating system outside shell shrouding 32, the lower part of shell shrouding 32 is provided with exhaustoutlet 36, exhaustoutlet 36 and boiler chimney 2 intercommunication. The rear tube plate 11, the shell 31 and the flue gas diversion heat exchange water jacket 33 enclose a smoke collection chamber 4, and the flue gas diversion heat exchange water jacket 33, the shell closing plate 32, the serpentine tube group 34, the distributive pipe 35 and the outlet of the boiler chimney 2 enclose a condensation chamber 5. The flue gas diversion heat exchange water jacket 33 and the axis of the boiler body 1 are in an inclined state, namely, a non-vertical state, the upper end of the flue gas diversion heat exchange water jacket 33 is provided with an automatic exhaust valve 331, the serpentine tube group 34 is composed of a plurality of serpentine tubes according to the size of the boiler, and the serpentine tubes are thin-wall stainless steel serpentine tubes. Knock out pipe 35 is located in the lower part of the space in housing 31, and serpentine tube bundle 34 is located above knock out pipe 35. A condensed water outlet 311 for discharging condensed water is provided at the bottom of the outer case 31. The boiler body 1 is a shell-type horizontal boiler.

The material surface in the condensation chamber 5 is coated with acid-resistant, heat-resistant and anti-corrosion paint except for the serpentine tube group 34.

The working principle of the condensation energy-saving low-nitrogen-emission gas normal-pressure heating boiler is as follows:

the reverse heat exchange of the hot and cold fluid is as follows: the hot flue gas flows out from the smoke collecting chamber 4 and flows from high position to low position in the condensing chamber 5, and the low-temperature return water (or other cold fluids) in the low-temperature return water pipeline of the heating system flows from low position to high position in the condensing chamber 4 through the water distribution pipe 35 and the serpentine pipe group 34 to realize the heat exchange of the hot and cold fluids in a relatively reverse flow manner, so as to ensure the high-efficiency condensation rate and the maximum heat utilization rate of the flue gas.

As shown in fig. 3, the flow direction of the flue gas is: the hot flue gas flows out from the rear tube plate 11 of the boiler body 1, is gathered in the smoke collection chamber 4, flows upwards along the outer surface of the flue gas diversion heat exchange water jacket 33, turns downwards in the upper space and enters the condensation chamber 5, the water vapor in the flue gas is cooled and condensed into condensed water on the outer surface of the serpentine tube group 34, the condensed water is discharged or collected and utilized from a condensed water outlet 311 positioned at the lower part, and the cooled flue gas is discharged to the boiler chimney 2 through a smoke discharge outlet 36.

The flow direction of the water is as follows: the low-temperature return water in the low-temperature return water pipeline of the heating system enters the serpentine pipe group 34 through the water distribution pipe 35, the water in the serpentine pipe group 34 absorbs the heat conducted by the flue gas outside the pipe to the inside of the pipe, and simultaneously gradually flows upwards to the top of the serpentine pipe group 34 to enter the flue gas diversion heat exchange water jacket 33, so that the heat conducted by the flue gas to the inside of the jacket is continuously absorbed, and the temperature of the flue gas is increased and then the flue gas enters the boiler body 1 from the water inlet 12 through the communicating pipe 13 from the lower part.

The utility model discloses in, the flow direction lower part that the comdenstion water that gets into the hot flue gas top-down's of condensing chamber heat exchange process formation can have no hindrance makes it contact and receives the hot surface, when keeping receiving the hot surface clean. The shell 31 is a cylinder shape which is adapted to the diameter of the rear tube plate 11 of the boiler body 1, the tube hole, the smoke collecting chamber and the condensing chamber, and is connected with the rear tube plate 11 of the boiler body 1. The flue gas diversion heat exchange water jacket 33 is the same as the inner diameter of the device shell, the top height is selected according to the position of a pipe hole on a boiler rear tube plate and the section of a channel required by flue gas, the top radial shell sealing plate 32 is an inclined plane plate, and the flue gas diversion heat exchange water jacket 33 is arranged between the smoke collection chamber 4 and the condensing chamber 5. The serpentine tube group 34 is composed of thin-wall stainless steel serpentine tubes with different numbers and different shapes. The serpentine tube group 34 is composed of different numbers of thin-wall stainless steel serpentine tubes according to the size of the boiler, the specific size, shape and number should be matched with the shell 31 to make full use of the space in the shell, the serpentine tube group 34 is composed of serpentine tubes (single, repeated or mixed) with different shapes, and the serpentine tubes can also be derived into various different shapes, particularly the combination shown in fig. 2.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and is not intended to limit the invention to the particular forms disclosed. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims

1. The utility model provides an energy-conserving low nitrogen of condensation discharges gas ordinary pressure heating boiler, includes boiler body (1) and boiler chimney (2), its characterized in that: a flue gas condensing device is arranged between the rear tube plate (11) of the boiler body (1) and the boiler chimney (2); the flue gas condensing device comprises a shell (31), a shell closing plate (32), a flue gas diversion heat exchange water jacket (33), a serpentine tube group (34), a water distribution pipe (35) and a smoke exhaust outlet (36); flue gas water conservancy diversion heat transfer water jacket (33), serpentine tube crowd (34) all set up in the space in shell (31), boiler body (1) lower extreme is provided with water inlet (12), communicating pipe (13) intercommunication is passed through with the lower extreme of flue gas water conservancy diversion heat transfer water jacket (33) in water inlet (12), flue gas water conservancy diversion heat transfer water jacket (33) upper end and serpentine tube crowd (34) upper end intercommunication, the lower extreme and distributive pipe (35) one end of serpentine tube crowd (34) are connected, the other end of distributive pipe (35) is worn out shell shrouding (32) outer and heating system's low temperature return water pipeline intercommunication, the lower part of shell shrouding (32) is provided with exhaustport (36), exhaustport (36) and boiler chimney (2) intercommunication.

2. The condensing energy-saving low-nitrogen-emission gas normal-pressure heating boiler according to claim 1, characterized in that: the flue gas condensing device is directly connected with a rear tube plate (11) of the boiler body (1).

3. The condensing energy-saving low-nitrogen-emission gas normal-pressure heating boiler according to claim 1, characterized in that: the rear tube plate (11), the shell (31) and the flue gas diversion heat exchange water jacket (33) enclose a smoke collection chamber (4), and the flue gas diversion heat exchange water jacket (33) and the shell sealing plate (32), the serpentine tube group (34), the water distribution pipe (35) and the outlet of the boiler chimney (2) enclose a condensation chamber (5).

4. The condensing energy-saving low-nitrogen-emission gas normal-pressure heating boiler according to claim 1, characterized in that: the flue gas diversion heat exchange water jacket (33) is vertical to or inclined with the axis of the boiler body (1).

5. The condensing energy-saving low-nitrogen-emission gas normal-pressure heating boiler according to claim 1, characterized in that: an automatic exhaust valve (331) is arranged at the upper end of the flue gas diversion heat exchange water jacket (33).

6. The condensing energy-saving low-nitrogen-emission gas normal-pressure heating boiler according to claim 1, characterized in that: the serpentine tube group (34) is composed of a plurality of serpentine tubes according to the size of the boiler.

7. The condensing energy-saving low-nitrogen-emission gas normal-pressure heating boiler according to claim 3, characterized in that: the surfaces of the materials in the condensing chamber (5) except the serpentine tube group (34) are coated with acid-resistant, heat-resistant and anticorrosive coatings.

8. The condensing energy-saving low-nitrogen-emission gas normal-pressure heating boiler according to claim 1, characterized in that: the water diversion pipe (35) is positioned at the lower part of the space in the shell (31), and the serpentine pipe group (34) is positioned above the water diversion pipe (35).

9. The condensing energy-saving low-nitrogen-emission gas normal-pressure heating boiler according to claim 1, characterized in that: the bottom of the shell (31) is provided with a condensed water outlet (311) for discharging condensed water.