A superheated steam boiler system for burning yellow phosphorus tail gas

Abstract

The invention discloses a superheated steam boiler system for burning yellow phosphorus tail gas, which comprises a yellow phosphorus combustion zone (1), a first radiation heat transfer zone (2), a second radiation heat transfer zone (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, characterized in that a first lattice wall (9) is arranged between the yellow phosphorus combustion zone and the first radiation heat transfer zone, a second lattice wall (10) is arranged between the first radiation heat transfer zone and the second radiation heat transfer zone, a third lattice wall (11) is arranged between the second radiation heat transfer zone 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 different, and the variable cross-section connecting flue (12) comprises a gradually contracting section, a straight section, and a gradually expanding section connected in sequence. The invention can improve the heat exchange adequacy of flue gas, thereby improving the calorific value utilization rate of yellow phosphorus tail gas.

Description

Technical Field

[0001] The invention relates to the technical field of yellow phosphorus tail gas recycling and yellow phosphorus tail gas boiler device, and in particular to a superheated steam boiler system for burning yellow phosphorus tail gas. Background Art

[0002] Yellow phosphorus tail gas has a high calorific value of 10-11.5MJ / Nm 3 , is a very good fuel. In the comprehensive utilization of yellow phosphorus tail gas, in addition to making chemical products, the use of yellow phosphorus tail gas as boiler power fuel after dust removal and purification has become a hot topic in the research of yellow phosphorus tail gas resource utilization.

[0003] 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, including 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, and the boiler body includes a heat exchange chamber, the heat exchange chamber includes a furnace, the side of the furnace is provided with a feed port, and the bottom of the furnace has a fixed water-cooled grate. The yellow phosphorus tail gas boiler supporting multi-fuel combustion has a 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 reduces the pollution of flue gas to the environment. Prior art CN203203010U discloses a yellow phosphorus tail gas combustion boiler, which adopts an optimized structural layout, optimizes the various components of the boiler, and uses a new inner wall material coating, thereby realizing the safe and stable operation of the yellow phosphorus tail gas boiler, extending the service life of the boiler, and achieving the purpose of effective utilization of yellow phosphorus tail gas. 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; at the same time, when part of the heat exchange structure fails, it can be quickly repaired and replaced. However, the existing boiler device still has the problem of low calorific value utilization. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a superheated steam boiler system for burning yellow phosphorus tail gas. Since the flow area of ​​the first lattice wall is greater than the second lattice wall and greater than the third lattice wall, it can play a good role in accumulating pressure (increasing pressure) before the flue gas enters the variable-section connecting flue, and can improve the heat exchange adequacy between the flue gas and the first radiation heat transfer zone and / or the second radiation heat transfer zone; when the flue gas passes through the variable-section connecting flue, the structure and size design of the first guide plate and the second guide plate can form an efficient diffusion vortex flue gas flow, and the diffusion vortex flue gas flow has sufficient mixed vortex properties, which can improve the heat exchange adequacy between the diffusion vortex flue gas flow and the first evaporator and / or the superheater, thereby improving the calorific value utilization rate of the yellow phosphorus tail gas.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A superheated steam boiler system for burning yellow phosphorus tail gas, comprising a yellow phosphorus combustion zone (1), a first radiation heat transfer zone (2), a second radiation heat transfer zone (3), a first evaporator (4), a superheater (5), a second evaporator (6), a waste heat steam boiler (7), and a burner (8). The yellow phosphorus combustion zone, the first radiation heat transfer zone, and the second radiation heat transfer zone are sequentially connected and arranged; the first evaporator, the superheater, and the second evaporator are sequentially connected and arranged; a variable cross-section connecting flue (12) is connected between the second radiation heat transfer zone and the first evaporator; the outlet end of the second evaporator is connected to the waste heat steam boiler via a steam boiler connecting pipe (71); the outlet end of the waste heat steam boiler is connected to an induced draft fan (74); the inlet end of the yellow phosphorus combustion zone is provided with a burner; the inner wall of the first shell of the yellow phosphorus combustion zone is provided with an embedded pipe (101); the inner wall of the first shell of the first radiation heat transfer zone is provided with a first membrane water-cooled wall (21); the inner wall of the first shell of the second radiation heat transfer zone is provided with a second membrane water-cooled wall (31); the first evaporator A first tube bundle (41) is arranged in the second shell of the superheater, a serpentine tube (51) is arranged in the second shell of the second evaporator, a second tube bundle (61) is arranged in the second shell of the second evaporator, a first boiler drum (22) is arranged on the outer wall of the first shell, a first collecting drum (23) is arranged on the lower inner wall of the first shell, a second collecting drum (24) is arranged on the upper inner wall of the first shell, a second boiler drum (25) is arranged on the outer wall of the second shell, and a third collecting drum (26) is arranged on the lower inner wall of the second shell. The tube is connected to each collecting tube through a pipeline and a valve, and is characterized in that a first lattice wall (9) is arranged between the yellow phosphorus combustion zone and the first radiation heat transfer zone, a second lattice wall (10) is arranged between the first radiation heat transfer zone and the second radiation heat transfer zone, and a third lattice wall (11) is arranged between the second radiation heat transfer zone 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 different, and the variable cross-section connecting flue (12) includes a gradually contracting section, a straight section and a gradually expanding section which are connected in sequence.

[0007] Furthermore, the relationship between the flow areas is: the first lattice wall (9)> the second lattice wall (10)> the third lattice wall (11).

[0008] Furthermore, the inner wall surface of the straight section is provided with a first guide plate (121), and a plurality of the first guide plates are distributed along the circumference of the straight section; the inner wall surface of the gradually expanding section is provided with a second guide plate (122), and a plurality of the second guide plates are distributed along the circumference of the gradually expanding section; and the inner diameter size of the first guide plate is equal to the minimum inner diameter size of the second guide plate.

[0009] Furthermore, the first guide plate (121) is arranged parallel to the axial direction / axis line of the variable cross-section connecting flue (12), and the second guide plate (122) is arranged inclined relative to the axis line of the variable cross-section connecting flue, with an inclination angle of 25-75°.

[0010] Furthermore, the gradually expanding cone angle of the gradually expanding section is a, a=100-110°, and the gradually contracting cone angle of the gradually contracting section is b, b=88-98°; a=(1.05-1.25)b.

[0011] Furthermore, the variable cross-section connecting flue (12) has an axial length L, and the straight section has an axial length L1, where L1=(0.3-0.5)L.

[0012] A superheated steam boiler system for burning yellow phosphorus tail gas of the present invention can play a good role of accumulating pressure (increasing pressure) before the flue gas enters the variable-section connecting flue because the flow area of ​​the first lattice wall is greater than the second lattice wall and greater than the third lattice wall, and can improve the heat exchange adequacy between the flue gas and the first radiation heat transfer area and / or the second radiation heat transfer area; when the flue gas passes through the variable-section connecting flue, the structure and size design of the first guide plate and the second guide plate can form an efficient diffusion vortex flue gas flow, and the diffusion vortex flue gas flow has sufficient mixing vortex properties, which can improve the heat exchange adequacy between the diffusion vortex flue gas flow and the first evaporator and / or the superheater, thereby improving the calorific value utilization rate of the yellow phosphorus tail gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a top view of the structure of the superheated steam boiler system for burning yellow phosphorus tail gas of the present invention;

[0014] Figure 2 This is a front view of the structure of the superheated steam boiler system for burning yellow phosphorus tail gas according to the present invention;

[0015] Figure 3 It is a side view of the structure of the superheated steam boiler system for burning yellow phosphorus tail gas of the present invention;

[0016] Figure 4 This is a schematic diagram of the structure of the waste heat steam boiler of the present invention;

[0017] Figure 5 This is a structural diagram of the flue connection of the present invention.

[0018] In the figure: yellow phosphorus combustion zone 1, first radiation heat transfer zone 2, second radiation heat transfer zone 3, first evaporator 4, superheater 5, second evaporator 6, waste heat steam boiler 7, burner 8, first lattice wall / grid wall 9, second lattice wall / grid wall 10, third lattice wall 11, variable cross-section connecting flue 12, buried pipe 101, first membrane water-cooled wall 21, first boiler drum 22, first collecting drum / collecting box 23, second collecting drum / collecting box 24, second boiler drum 25, third collecting box 26, second membrane water-cooled wall 31, first tube bundle 41, serpentine tube 51, second tube bundle 61, steam boiler connecting pipe 71, boiler body 72, third boiler drum 73, induced draft fan 74, first guide plate 121, second guide plate 122. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0021] like Figure 1-5As shown, a superheated steam boiler system for burning yellow phosphorus tail gas comprises a yellow phosphorus combustion zone 1, a first radiation heat transfer zone 2, a second radiation heat transfer zone 3, a first evaporator 4, a superheater 5, a second evaporator 6, a waste heat steam boiler 7, and a burner 8. The yellow phosphorus combustion zone 1, the first radiation heat transfer zone 2, and the second radiation heat transfer zone 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 zone 3 and the first evaporator 4, the outlet end of the second evaporator 6 is connected to the waste heat steam boiler 7 through a steam boiler connecting pipe 71, and the outlet end of the waste heat steam boiler 7 is connected to an induced draft fan 74, a burner 8 is provided at the left end / inlet end of the yellow phosphorus combustion zone 1, an buried pipe 101 is provided on the inner wall of the first shell of the yellow phosphorus combustion zone 1, a first membrane water-cooled wall 21 is provided on the inner wall of the first shell of the first radiation heat transfer zone 2, a second membrane water-cooled wall 31 is provided on the inner wall of the first shell of the second radiation heat transfer zone 3, and the second shell of the first evaporator 4 is provided. The first tube bundle 41 is arranged in the second shell of the superheater 5, the serpentine tube 51 is arranged in the second shell of the second evaporator 6, the second tube bundle 61 is arranged in the second shell of the second evaporator 6, the first drum 22 is arranged on the outer wall (inside the wall or on the wall) of the first shell, the first collecting tube 23 is arranged on the lower inner wall (inside the wall or on the wall) of the first shell, the second collecting tube 24 is arranged on the upper inner wall of the first shell, the second drum 25 is arranged on the outer wall of the second shell, and the third collecting tube 26 is arranged on the lower inner wall of the second shell. The collecting tubes are connected by pipelines and valves, and are characterized in that: a first lattice wall 9 is arranged between the yellow phosphorus combustion zone 1 and the first radiation heat transfer zone 2, a second lattice wall 10 is arranged between the first radiation heat transfer zone 2 and the second radiation heat transfer zone 3, and a third lattice wall 11 is arranged between the second radiation heat transfer zone 3 and the variable-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 not equal, and the variable-section connecting flue 12 includes a gradually contracting section, a straight section, and a gradually expanding section connected in sequence.

[0022] Furthermore, the flow area of ​​the first lattice wall 9 is greater than that of the second lattice wall 10 and greater than that of the third lattice wall 11 .

[0023] Furthermore, a first guide plate 121 is provided on the inner wall surface of the straight section, and a plurality of first guide plates 121 are distributed along the circumference of the straight section; a second guide plate 122 is provided on the inner wall surface of the gradually expanding section, and a plurality of second guide plates 122 are distributed along the circumference of the gradually expanding section; an inner diameter dimension of the first guide plate 121 is equal to a minimum inner diameter dimension of the second guide plate 122.

[0024] The first guide plate 121 is arranged parallel to the axial direction / axis line of the variable cross-section connecting flue 12, and the second guide plate 122 is arranged inclined relative to the axis line of the variable cross-section connecting flue 12, with an inclination angle of 25-75°.

[0025] The expanding cone angle of the expanding section is a, a=100-110°, preferably 106°; the converging cone angle of the converging section is b, b=88-98°, preferably 93°; a=(1.1-1.2)b, preferably 1.15.

[0026] The variable cross-section connecting flue 12 has an axial length L, and the straight section has an axial length L1, where L1=(0.35-0.45)L, preferably, 0.4.

[0027] The waste heat steam boiler 7 comprises a boiler body 72 and a third drum 73 . The outer wall of the boiler body 72 is provided with the third drum 73 . The outlet end of the boiler body 72 is connected to an induced draft fan 74 through a pipeline.

[0028] The invention discloses a superheated steam boiler system for burning yellow phosphorus tail gas. The flue gas passes through a first shell (yellow phosphorus combustion zone 1, a first radiation heat transfer zone 2, a second radiation heat transfer zone 3), a variable cross-section connecting flue 12, a second shell (a first evaporator 4, a superheater 5, a second evaporator 6), a waste heat steam boiler 7, and an induced draft fan 74 in sequence. Since the flow area of ​​the first lattice wall 9 is greater than that of the second lattice wall 10 and greater than that of the third lattice wall 11, a good pressure accumulation (pressure increase) effect can be achieved before the flue gas enters the variable cross-section connecting flue 12, and the heat exchange adequacy between the flue gas and the first radiation heat transfer zone 2 and / or the second radiation heat transfer zone 3 can be improved. When the flue gas passes through the variable cross-section connecting flue 12, a high-efficiency diffusion vortex flue gas flow can be formed through the structural and size design of the first guide plate 121 and the second guide plate 122. The diffusion vortex flue gas flow has sufficient mixed vortex properties, and the heat exchange adequacy between the diffusion vortex flue gas flow and the first evaporator 4 and / or the superheater 5 can be improved, thereby improving the utilization rate of the calorific value of the yellow phosphorus tail gas.

[0029] A superheated steam boiler system for burning yellow phosphorus tail gas of the present invention can play a good role of accumulating pressure (increasing pressure) before the flue gas enters the variable-section connecting flue because the flow area of ​​the first lattice wall is greater than the second lattice wall and greater than the third lattice wall, and can improve the heat exchange adequacy between the flue gas and the first radiation heat transfer area and / or the second radiation heat transfer area; when the flue gas passes through the variable-section connecting flue, the structure and size design of the first guide plate and the second guide plate can form an efficient diffusion vortex flue gas flow, and the diffusion vortex flue gas flow has sufficient mixing vortex properties, which can improve the heat exchange adequacy between the diffusion vortex flue gas flow and the first evaporator and / or the superheater, thereby improving the calorific value utilization rate of the yellow phosphorus tail gas.

[0030] The above-mentioned implementation modes are for explanation of the present invention rather than limitation of the present invention. It can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A superheated steam boiler system for burning yellow phosphorus tail gas, comprising a yellow phosphorus combustion zone (1), a first radiation heat transfer zone (2), a second radiation heat transfer zone (3), a first evaporator (4), a superheater (5), a second evaporator (6), a waste heat steam boiler (7), and a burner (8); the yellow phosphorus combustion zone, the first radiation heat transfer zone, and the second radiation heat transfer zone are sequentially connected and arranged; the first evaporator, the superheater, and the second evaporator are sequentially connected and arranged; a variable cross-section connecting flue (12) is connected between the second radiation heat transfer zone and the first evaporator; the outlet end of the second evaporator is connected to the waste heat steam boiler through a steam boiler connecting pipe (71); the outlet end of the waste heat steam boiler is connected to an induced draft fan (74); the inlet end of the yellow phosphorus combustion zone is provided with a burner; the inner wall of the first shell of the yellow phosphorus combustion zone is provided with a There is a buried pipe (101), the first shell inner wall of the first radiation heat transfer zone is provided with a first membrane water-cooled wall (21), the first shell inner wall of the second radiation heat transfer zone is provided with a second membrane water-cooled wall (31), the second shell of the first evaporator is provided with a first tube bundle (41), the second shell of the superheater is provided with a serpentine tube (51), the second shell of the second evaporator is provided with a second tube bundle (61), the first boiler drum (22) is provided on the outer wall of the first shell, the first collecting drum (23) is provided on the lower inner wall of the first shell, the second collecting drum (24) is provided on the upper inner wall of the first shell, the second boiler drum (25) is provided on the outer wall of the second shell, and the third collecting drum (26) is provided on the lower inner wall of the second shell, and each boiler drum is connected to each collecting drum through a pipeline and a valve, characterized in that: A first lattice wall (9) is arranged between the yellow phosphorus combustion zone and the first radiation heat transfer zone, a second lattice wall (10) is arranged between the first radiation heat transfer zone and the second radiation heat transfer zone, and a third lattice wall (11) is arranged between the second radiation heat transfer zone 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 different. The variable cross-section connecting flue (12) comprises a gradually contracting section, a straight section and a gradually expanding section which are connected in sequence. The flow area has a relationship of: the first lattice wall (9)> the second lattice wall (10)> the third lattice wall (11).

2. A superheated steam boiler system for burning yellow phosphorus tail gas as claimed in claim 1, characterized in that: The inner wall surface of the straight section is provided with a first guide plate (121), and a plurality of the first guide plates are distributed along the circumference of the straight section; the inner wall surface of the gradually expanding section is provided with a second guide plate (122), and a plurality of the second guide plates are distributed along the circumference of the gradually expanding section; the inner diameter size of the first guide plate is equal to the minimum inner diameter size of the second guide plate.

3. A superheated steam boiler system for burning yellow phosphorus tail gas as claimed in claim 2, characterized in that: The first guide plate (121) is arranged parallel to the axial direction / axis line of the variable cross-section connecting flue (12), and the second guide plate (122) is arranged inclined relative to the axis line of the variable cross-section connecting flue, with an inclination angle of 25-75°.

4. A yellow phosphorus tail gas superheated steam boiler system as claimed in claim 3, characterized in that: The gradually expanding cone angle of the gradually expanding section is a, a=100-110°, and the gradually contracting cone angle of the gradually contracting section is b, b=88-98°; a=(1.05-1.25)b.

5. A yellow phosphorus tail gas superheated steam boiler system as claimed in claim 4, characterized in that: The variable cross-section connecting flue (12) has an axial length L, and the straight section has an axial length L1, where L1 = (0.3-0.5)L.

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