CN114811620A

CN114811620A - Yellow phosphorus tail gas burning overheating steam boiler system

Info

Publication number: CN114811620A
Application number: CN202210477501.3A
Authority: CN
Inventors: 桂南营; 胡殿猛
Original assignee: Jiangxi South Boiler Share Co ltd
Current assignee: Jiangxi South Boiler Share Co ltd
Priority date: 2022-05-04
Filing date: 2022-05-04
Publication date: 2022-07-29

Abstract

The invention discloses a yellow phosphorus tail gas burning superheated steam boiler system, which comprises a yellow phosphorus burning area (1), a first radiation heat transfer area (2), a second radiation heat transfer area (3), a variable cross-section connecting flue (12), a first evaporator (4), a superheater (5), a second evaporator (6), a waste heat steam boiler (7) and an induced draft fan which are connected in sequence, and is characterized in that: a first lattice wall (9) is arranged between the yellow phosphorus combustion area and the first radiation heat transfer area, a second lattice wall (10) is arranged between the first radiation heat transfer area and the second radiation heat transfer area, a third lattice wall (11) is arranged between the second radiation heat transfer area and the variable cross-section connecting flue, the flow areas of the first lattice wall, the second lattice wall and the third lattice wall are unequal, and the variable cross-section connecting flue (12) comprises a gradually reducing section, a straight section and a gradually expanding section which are sequentially connected. The invention can improve the heat exchange sufficiency of the flue gas, thereby improving the utilization rate of the heat value of the yellow phosphorus tail gas.

Description

Yellow phosphorus tail gas burning overheating steam boiler system

Technical Field

The invention relates to the technical field of yellow phosphorus tail gas recycling and yellow phosphorus tail gas boiler devices, in particular to a yellow phosphorus tail gas burning overheating steam boiler system.

Background

The yellow phosphorus tail gas has high heat value and the calorific value is 10-11.5MJ/Nm ³ It is a very good fuel. In the research of comprehensive utilization of the yellow phosphorus tail gas, the yellow phosphorus tail gas is used as a power fuel for a boiler after being dedusted and purified in addition to the preparation of chemical products, and the research has become a hotspot of yellow phosphorus tail gas resource research.

Prior art CN203099789U discloses a yellow phosphorus tail gas boiler supporting multi-fuel combustion, which relates to the field of yellow phosphorus tail gas boilers and comprises a burner, a boiler body, a waste heat recovery device and a cyclone dust collector, wherein the burner is provided with a yellow phosphorus tail gas combustion pipeline and a natural gas combustion pipeline, the boiler body comprises a heat exchange chamber, the heat exchange chamber comprises a hearth, the side part of the hearth is provided with a feed inlet, and the bottom of the hearth is provided with a fixed water-cooled grate. The yellow phosphorus tail gas boiler supporting multi-fuel combustion has high composite utilization rate, ensures the normal operation of production, shortens the investment period of the boiler, improves the heat utilization efficiency, reduces the dust emission and lightens the pollution of smoke to the environment. The prior art CN203203010U discloses a boiler for yellow phosphorus tail gas combustion, which adopts an optimized structural arrangement, optimizes all parts of the boiler, and uses a new inner wall material coating, thereby realizing the safe and stable operation of the boiler for yellow phosphorus tail gas combustion, prolonging the service life of the boiler, and achieving the purpose of effectively utilizing the yellow phosphorus tail gas. The prior art CN205843417U discloses a radiation heat exchanger for a yellow phosphorus tail gas combustion boiler, which has the advantages of high temperature resistance, corrosion resistance and wear resistance; meanwhile, when part of the heat exchange structures are in fault, the heat exchange structure can be quickly overhauled and replaced. But the existing boiler device still has the problem of low heat value utilization rate.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a yellow phosphorus tail gas burning superheated steam boiler system, and as the flow area of the first lattice wall, the second lattice wall and the third lattice wall is larger than that of the second lattice wall, the steam boiler system can play a good role in pressure accumulation (pressure increase) before the flue gas enters the variable cross-section connecting flue, and can improve the heat exchange sufficiency of the flue gas and the first radiant heat transfer area and/or the second radiant heat transfer area; when the flue gas passes through the variable cross section and connects the flue, through the structure and the dimensional design of first guide plate, second guide plate, can form efficient diffusion vortex flue gas stream, diffusion vortex flue gas stream has abundant mixed vortex nature, can improve the heat transfer sufficiency of diffusion vortex flue gas stream and first evaporimeter and/or over heater to improve yellow phosphorus tail gas calorific value utilization ratio.

In order to achieve the purpose, the invention adopts the technical scheme that:

a superheated steam boiler system for burning yellow phosphorus tail gas comprises a yellow phosphorus burning area (1), a first radiation heat transfer area (2), a second radiation heat transfer area (3), a first evaporator (4), a superheater (5), a second evaporator (6), a waste heat steam boiler (7) and a burner (8), wherein the yellow phosphorus burning area, the first radiation heat transfer area and the second radiation heat transfer area are sequentially connected, the first evaporator, the superheater and the second evaporator are sequentially connected, a variable cross-section connecting flue (12) is connected between the second radiation heat transfer area and the first evaporator, the outlet end of the second evaporator is connected with the waste heat steam boiler through a steam boiler connecting pipe (71), the outlet end of the waste heat steam boiler is connected with an induced draft fan (74), the inlet end of the yellow phosphorus burning area is provided with the burner, the inner wall of a first shell of the yellow phosphorus burning area is provided with a buried pipe (101), first shells inner wall in first radiation heat transfer district is provided with first membrane wall (21), the first shells inner wall in second radiation heat transfer district is provided with second membrane wall (31), be provided with first tube bank (41) in the second casing of first evaporimeter, be provided with coiled pipe (51) in the second casing of over heater, be provided with second tube bank (61) in the second casing of second evaporimeter, first boiler barrel (22) set up in the outer wall of first casing, first collection section of thick bamboo (23) set up in the lower part inner wall of first casing, second collection section of thick bamboo (24) set up in the upper portion inner wall of first casing, second boiler barrel (25) set up in the outer wall of second casing, third collection section of thick bamboo (26) set up in the lower part inner wall of second casing, pass through the pipeline between each boiler barrel and each collection section of thick bamboo, the valve connection, its characterized in that: a first lattice wall (9) is arranged between the yellow phosphorus combustion area and the first radiation heat transfer area, a second lattice wall (10) is arranged between the first radiation heat transfer area and the second radiation heat transfer area, a third lattice wall (11) is arranged between the second radiation heat transfer area and the variable cross-section connecting flue, the flow areas of the first lattice wall, the second lattice wall and the third lattice wall are unequal, and the variable cross-section connecting flue (12) comprises a gradually reducing section, a straight section and a gradually expanding section which are sequentially connected.

Further, the flow area size relationship is as follows: the first lattice wall (9) > the second lattice wall (10) > the third lattice wall (11).

Furthermore, a first guide plate (121) is arranged on the inner wall surface of the straight section, a plurality of first guide plates are distributed along the circumferential direction of the straight section, a second guide plate (122) is arranged on the inner wall surface of the divergent section, a plurality of second guide plates are distributed along the circumferential direction of the divergent section, and the inner diameter size of each first guide plate is equal to the minimum inner diameter size of each second guide plate.

Further, the first guide plate (121) is arranged in parallel with the axial direction/axis of the variable cross-section connecting flue (12), and the second guide plate (122) is arranged in an inclined mode relative to the axis of the variable cross-section connecting flue, and the inclined angle is 25-75 degrees.

Further, the taper angle of the divergent section is a, a = 100-; a = (1.05-1.25) b.

Further, the variable cross-section connecting flue (12) has an axial length L, and the straight section has an axial length L1, and L1= (0.3-0.5) L.

According to the superheated steam boiler system for combusting yellow phosphorus tail gas, the first lattice wall, the second lattice wall and the third lattice wall are arranged in the flow area, so that a good pressure accumulation (pressure increase) effect can be achieved before the flue gas enters the variable cross-section connecting flue, and the heat exchange sufficiency of the flue gas and the first radiation heat transfer area and/or the second radiation heat transfer area can be improved; when the flue gas passes through the variable cross section and connects the flue, through the structure and the dimensional design of first guide plate, second guide plate, can form efficient diffusion vortex flue gas stream, diffusion vortex flue gas stream has abundant mixed vortex nature, can improve the heat transfer sufficiency of diffusion vortex flue gas stream and first evaporimeter and/or over heater to improve yellow phosphorus tail gas calorific value utilization ratio.

Drawings

FIG. 1 is a top view of a yellow phosphorus tail gas fired superheated steam boiler system according to the present invention;

FIG. 2 is a front view of the system of the superheated steam boiler burning yellow phosphorus of the present invention;

FIG. 3 is a side view of the structure of the yellow phosphorus tail gas burning superheated steam boiler system of the present invention;

FIG. 4 is a schematic view of the waste heat steam boiler of the present invention;

FIG. 5 is a view showing the structure of the connecting flue of the present invention.

In the figure: the system comprises a yellow phosphorus combustion area 1, a first radiant heat transfer area 2, a second radiant heat transfer area 3, a first evaporator 4, a superheater 5, a second evaporator 6, a waste heat steam boiler 7, a burner 8, a first lattice wall/grid wall 9, a second lattice wall/grid wall 10, a third lattice wall 11, a variable cross-section connecting flue 12, a buried pipe 101, a first membrane water-cooling wall 21, a first boiler barrel 22, a first header/header 23, a second header/header 24, a second boiler barrel 25, a third header 26, a second membrane water-cooling wall 31, a first pipe bundle 41, a serpentine pipe 51, a second pipe bundle 61, a steam boiler connecting pipe 71, a boiler body 72, a third boiler barrel 73, an induced draft fan 74, a first guide plate 121 and a second guide plate 122.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1-5, a yellow phosphorus tail gas burning superheated steam boiler system comprises a yellow phosphorus combustion area 1, a first radiation heat transfer area 2, a second radiation heat transfer area 3, a first evaporator 4, a superheater 5, a second evaporator 6, a waste heat steam boiler 7 and a burner 8, wherein the yellow phosphorus combustion area 1, the first radiation heat transfer area 2 and the second radiation heat transfer area 3 are sequentially connected, the first evaporator 4, the superheater 5 and the second evaporator 6 are sequentially connected, a variable cross-section connecting flue 12 is connected between the second radiation heat transfer area 3 and the first evaporator 4, the outlet end of the second evaporator 6 is connected with the waste heat steam boiler 7 through a steam boiler connecting pipe 71, the outlet end of the waste heat steam boiler 7 is connected with an induced draft fan 74, the left end/inlet end of the yellow phosphorus combustion area 1 is provided with the burner 8, the inner wall of a first shell of the yellow phosphorus combustion area 1 is provided with a buried pipe 101, the first shell inner wall of the first radiation heat transfer area 2 is provided with a first membrane type water-cooling wall 21, the first shell inner wall of the second radiation heat transfer area 3 is provided with a second membrane type water-cooling wall 31, the second shell of the first evaporator 4 is provided with a first tube bundle 41, the second shell of the superheater 5 is provided with a coiled tube 51, the second shell of the second evaporator 6 is provided with a second tube bundle 61, the first boiler barrel 22 is arranged on the outer wall (in the wall or on the wall surface) of the first shell, the first collecting barrel 23 is arranged on the lower inner wall (in the wall or on the wall surface) of the first shell, the second collecting barrel 24 is arranged on the upper inner wall of the first shell, the second boiler barrel 25 is arranged on the outer wall of the second shell, the third collecting barrel 26 is arranged on the lower inner wall of the second shell, and each boiler barrel is connected with each collecting barrel through a pipeline and a valve, and the heat transfer heat exchanger is characterized in that: a first lattice wall 9 is arranged between the yellow phosphorus combustion area 1 and the first radiation heat transfer area 2, a second lattice wall 10 is arranged between the first radiation heat transfer area 2 and the second radiation heat transfer area 3, a third lattice wall 11 is arranged between the second radiation heat transfer area 3 and the variable cross-section connecting flue 12, the flow areas of the first lattice wall 9, the second lattice wall 10 and the third lattice wall 11 are different, and the variable cross-section connecting flue 12 comprises a gradually reducing section, a straight section and a gradually expanding section which are connected in sequence.

Furthermore, the flow area is that the first lattice wall 9 is larger than the second lattice wall 10 is larger than the third lattice wall 11.

Further, a first guide plate 121 is arranged on the inner wall surface of the straight section, the plurality of first guide plates 121 are distributed along the circumferential direction of the straight section, a second guide plate 122 is arranged on the inner wall surface of the divergent section, the plurality of second guide plates 122 are distributed along the circumferential direction of the divergent section, and the inner diameter of the first guide plate 121 is equal to the minimum inner diameter of the second guide plate 122.

The first deflector 121 is arranged parallel to the axial/axial line of the variable cross-section connecting flue 12, and the second deflector 122 is arranged obliquely with respect to the axial line of the variable cross-section connecting flue 12, with an angle of inclination of 25-75 °.

The diverging cone angle of the diverging section is a, a = 100-; the tapered cone angle of the tapered section is b, b =88-98 °, preferably 93 °; a = (1.1-1.2) b, preferably, 1.15.

The variable cross-section connecting flues 12 have an axial length L, the straight sections have an axial length L1, L1= (0.35-0.45) L, preferably 0.4.

The waste heat steam boiler 7 comprises a boiler body 72 and a third cylinder 73, the outer wall of the boiler body 72 is provided with the third cylinder 73, and the outlet end of the boiler body 72 is connected with an induced draft fan 74 through a pipeline.

According to the superheated steam boiler system for burning yellow phosphorus tail gas, the flue gas sequentially passes through the first shell (a yellow phosphorus burning area 1, a first radiation heat transfer area 2 and a second radiation heat transfer area 3), the variable cross-section connecting flue 12, the second shell (a first evaporator 4, a superheater 5 and a second evaporator 6), the waste heat steam boiler 7 and the induced draft fan 74, and due to the fact that the flow area of the first lattice wall 9 is larger than that of the second lattice wall 10 is larger than that of the third lattice wall 11, the flue gas can play a good role in pressure accumulation (pressure increase) before entering the variable cross-section connecting flue 12, and the heat exchange sufficiency of the flue gas and the first radiation heat transfer area 2 and/or the second radiation heat transfer area 3 can be improved; when the flue gas passes through the variable cross section connecting flue 12, through the structure and the size design of the first guide plate 121 and the second guide plate 122, efficient diffusion vortex flue gas flow can be formed, the diffusion vortex flue gas flow has sufficient mixed vortex flow, the heat exchange sufficiency of the diffusion vortex flue gas flow and the first evaporator 4 and/or the superheater 5 can be improved, and therefore the yellow phosphorus tail gas heat value utilization rate is improved.

The above-described embodiments are illustrative of the present invention and not restrictive, it being understood that various changes, modifications, substitutions and alterations can be made herein without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A superheated steam boiler system for burning yellow phosphorus tail gas comprises a yellow phosphorus burning area (1), a first radiation heat transfer area (2), a second radiation heat transfer area (3), a first evaporator (4), a superheater (5), a second evaporator (6), a waste heat steam boiler (7) and a burner (8), wherein the yellow phosphorus burning area, the first radiation heat transfer area and the second radiation heat transfer area are sequentially connected, the first evaporator, the superheater and the second evaporator are sequentially connected, a variable cross-section connecting flue (12) is connected between the second radiation heat transfer area and the first evaporator, the outlet end of the second evaporator is connected with the waste heat steam boiler through a steam boiler connecting pipe (71), the outlet end of the waste heat steam boiler is connected with an induced draft fan (74), the inlet end of the yellow phosphorus burning area is provided with the burner, the inner wall of a first shell of the yellow phosphorus burning area is provided with a buried pipe (101), first shells inner wall in first radiation heat transfer district is provided with first membrane wall (21), the first shells inner wall in second radiation heat transfer district is provided with second membrane wall (31), be provided with first tube bank (41) in the second casing of first evaporimeter, be provided with coiled pipe (51) in the second casing of over heater, be provided with second tube bank (61) in the second casing of second evaporimeter, first boiler barrel (22) set up in the outer wall of first casing, first collection section of thick bamboo (23) set up in the lower part inner wall of first casing, second collection section of thick bamboo (24) set up in the upper portion inner wall of first casing, second boiler barrel (25) set up in the outer wall of second casing, third collection section of thick bamboo (26) set up in the lower part inner wall of second casing, pass through the pipeline between each boiler barrel and each collection section of thick bamboo, the valve connection, its characterized in that: a first lattice wall (9) is arranged between the yellow phosphorus combustion area and the first radiation heat transfer area, a second lattice wall (10) is arranged between the first radiation heat transfer area and the second radiation heat transfer area, a third lattice wall (11) is arranged between the second radiation heat transfer area and the variable cross-section connecting flue, the flow areas of the first lattice wall, the second lattice wall and the third lattice wall are unequal, and the variable cross-section connecting flue (12) comprises a gradually reducing section, a straight section and a gradually expanding section which are sequentially connected.

2. A yellow phosphorus fired off-gas superheated steam boiler system according to claim 1, wherein the relationship of flow area size: the first lattice wall (9) > the second lattice wall (10) > the third lattice wall (11).

3. A yellow phosphorus-fired off-gas superheated steam boiler system according to claim 2, wherein the inner wall surface of the straight section is provided with a first baffle (121), a plurality of first baffles are distributed along the circumferential direction of the straight section, the inner wall surface of the divergent section is provided with a second baffle (122), a plurality of second baffles are distributed along the circumferential direction of the divergent section, and the inner diameter of the first baffle is equal to the minimum inner diameter of the second baffle.

4. A yellow phosphorus-fired off-gas superheated steam boiler system according to claim 3, wherein the first baffle plate (121) is arranged parallel to the axis of the variable cross-section connecting flue (12), and the second baffle plate (122) is arranged inclined at an angle of 25-75 ° with respect to the axis of the variable cross-section connecting flue.

5. A yellow phosphorus-fired off-gas superheated steam boiler system according to claim 4, wherein the tapered angle of the tapered section is a, a = 100-; a = (1.05-1.25) b.

6. A yellow phosphorus-fired off-gas superheated steam boiler system according to claim 5, wherein the variable cross-section connecting flue (12) has an axial length L, the straight section has an axial length L1, L1= (0.3-0.5) L.