A tail gas treatment device for anti-coking process of a waste heat steam boiler

Abstract

The application discloses a tail gas treatment device for a residual heat steam boiler anti-coking process, which comprises a tail gas pipeline and a spray head, wherein the spray head is used for spraying a treatment liquid into the tail gas pipeline, and the spray head comprises a spray head body, a first spray core, a second spray core and a third spray core and a connecting flow guide rib; the first spray core comprises first inlet holes and first outlet holes which are sequentially connected; the second spray core comprises second inlet holes and second outlet holes which are sequentially connected; the third spray core comprises third inlet holes, a transition cavity and third outlet holes which are sequentially connected; and the connecting flow guide rib comprises a first tapering section, an expanding section and a second tapering section which are sequentially connected; the first inlet holes, the second inlet holes and the third inlet holes are tapering holes, and the first outlet holes and the second outlet holes are expanding holes. The application can effectively improve the atomization uniformity of the treatment liquid, make the atomized liquid particle size smaller, improve the reaction efficiency and effect of the treatment liquid and the tail gas, and improve the tail gas treatment efficiency and effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of anti-coking process of steam boiler, in particular to a tail gas treatment device for anti-coking process of waste heat steam boiler. BACKGROUND

[0002] The existing tail gas treatment device for anti-coking process of waste heat steam boiler comprises a tail gas pipeline and a spray head, the spray head is detachably installed on the pipe wall of the tail gas pipeline, and the spray head is used for spraying treatment liquid into the tail gas pipeline, the treatment liquid reacts with the tail gas, the spray head comprises a spray head body, a spray core and a connecting rib, the outlet end of the spray head body is connected with the connecting rib, and the spray core is connected in the connecting rib. However, the existing spray head still has the problems of poor atomization uniformity, large atomized liquid particle size, and the reaction efficiency / effect of the treatment liquid and the tail gas needs to be further improved. SUMMARY

[0003] The purpose of the present application is to overcome the deficiencies in the prior art, provide a tail gas treatment device for anti-coking process of waste heat steam boiler, which can effectively improve the atomization uniformity of the treatment liquid, make the atomized liquid particle size smaller, thereby improve the reaction efficiency / effect of the treatment liquid and the tail gas, and improve the tail gas treatment efficiency / effect.

[0004] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is:

[0005] The exhaust gas treatment device for the anti-coking process of the waste heat steam boiler comprises an exhaust gas pipeline (10) and a spray head (20) which is detachably installed on the wall of the exhaust gas pipeline and used for spraying treatment liquid into the exhaust gas pipeline, and the spray head comprises a spray head main body (1), a first spray core (2), a second spray core (3), a third spray core (4) and a connecting flow guide rib (5) connected to the outlet end of the spray head main body; characterized in that the first spray core, the second spray core and the third spray core are sequentially and spacedly arranged in the connecting flow guide rib, the spray head main body comprises a straight pipe section (11) and a reducing pipe section (12), the first spray core comprises a first inlet hole (21) and a first outlet hole (22) which are sequentially connected, the second spray core comprises a second inlet hole (31) and a second outlet hole (32) which are sequentially connected, the third spray core comprises a third inlet hole (41), a transition cavity (42) and a third outlet hole (43) which are sequentially connected, the connecting flow guide rib comprises a first tapered section (51), a diverging section (52) and a second tapered section (53) which are sequentially connected; the first inlet hole, the second inlet hole and the third inlet hole are tapered holes, the first outlet hole and the second outlet hole are diverging holes, the third outlet holes are distributed in the circumferential direction, the outlet end of the third spray core is provided with a central blocking part (44), the taper of the inner circumferential surface of the first tapered section is matched with and identical to the taper of the outer circumferential surface of the reducing pipe section, the taper of the inner circumferential surface of the diverging section is matched with and identical to the taper of the outer circumferential surface of the first spray core, and the taper of the inner circumferential surface of the second tapered section is matched with and identical to the tapers of the outer circumferential surfaces of the second spray core and the third spray core.

[0006] Further, the connecting flow guide rib is N, N ≥ 4, and the N connecting flow guide ribs are uniformly distributed in the circumferential direction, and the cross section of the connecting flow guide rib is in the shape of a wing.

[0007] Further, the straight pipe section has an outer diameter D1, the first inlet hole has a large diameter D2, the second inlet hole has a large diameter D3, the third inlet hole has a large diameter D4, and D1 > D2 > D3 > D4.

[0008] Further, the reducing pipe section has a main body outlet hole (13) with a diameter d1, the first outlet hole has a large diameter d2, the second outlet hole has a large diameter d3, and d1 > d2 > d3.

[0009] Further, with respect to the central axis of the spray head, the upper outer circumferential surface of the first spray core has an inclination angle a1, the upper outer circumferential surface of the second spray core has an inclination angle a2, the upper outer circumferential surface of the third spray core has an inclination angle a3, the diverging section has an inclination angle a4, the second tapered section has an inclination angle a5, and a1 > a2 > a3 > a5 > a4.

[0010] Further, the height H in the axial direction between the lower end face of the reduced pipe section and the upper end face of the third nozzle core, the height H1 in the axial direction between the lower end face of the reduced pipe section and the upper end face of the first nozzle core, the height H2 in the axial direction between the lower end face of the first nozzle core and the upper end face of the second nozzle core, and the height H3 in the axial direction between the lower end face of the second nozzle core and the upper end face of the third nozzle core satisfy H>H1>H2>H3.

[0011] Further, D2=(0.27-0.37)D1, D3=(0.17-0.27)D1, D4=(0.12-0.22)D1.

[0012] Further, d2=(0.8-0.9)d1, d3=(0.7-0.8)d1, d1=(0.3-0.4)D1.

[0013] Further, a2=(0.7-0.8)a1, a3=(0.37-0.47)a1, a5=(0.25-0.35)a1, a4=(0.17-0.27)a1.

[0014] Further, H1=(0.2-0.3)H, H2=(0.1-0.2)H, H3=(0.05-0.15)H.

[0015] The tail gas treatment device for the anti-coking process of the waste heat steam boiler can effectively improve the atomization uniformity of the treatment liquid, make the particle size of the atomized liquid smaller, improve the reaction efficiency and effect of the treatment liquid and the tail gas, and improve the tail gas treatment efficiency and effect. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 The figure is a schematic diagram of the tail gas treatment device for the anti-coking process of the waste heat steam boiler;

[0017] Fig. 2 The figure is a schematic diagram of the nozzle structure of the tail gas treatment device for the anti-coking process of the waste heat steam boiler;

[0018] Fig. 3 The figure is a schematic diagram of the nozzle structure of the tail gas treatment device for the anti-coking process of the waste heat steam boiler.

[0019] In the figure: tail gas pipeline 10, nozzle 20, nozzle main body 1, first nozzle core 2, second nozzle core 3, third nozzle core 4, connecting flow guide rib 5, straight pipe section 11, reduced pipe section 12, main body outlet hole 13, first inlet hole 21, first outlet hole 22, second inlet hole 31, second outlet hole 32, third inlet hole 41, transition cavity 42, third outlet hole 43, central blocking part 44, first tapered section 51, expanding section 52, second tapered section 53. Detailed Implementation

[0020] To make the technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in a clearer and more complete manner below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of the present invention, and are only used to explain the present invention, not to limit the present invention. It should be noted that, for ease of description, only the parts / structures related to the present invention are shown in the accompanying drawings. Other related parts can be referred to with ordinary design. In the absence of conflict, the embodiments and technical features in the embodiments of the present invention can be combined with each other to obtain new embodiments.

[0021] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention. Furthermore, unless otherwise defined, the technical or scientific terms used in the description of this invention should have the ordinary meaning understood by those skilled in the art.

[0022] The present invention will now be described in further detail with reference to the accompanying drawings.

[0023] like Figs. 1-3 As shown, a tail gas treatment device for an anti-coking process in a waste heat steam boiler includes a tail gas pipe 10 and a nozzle 20. The nozzle 20 is detachably installed on the pipe wall of the tail gas pipe 10 and is used to spray a treatment liquid into the tail gas pipe 10. The treatment liquid reacts with the tail gas. The nozzle 20 includes a nozzle body 1, a first spray core 2, a second spray core 3, a third spray core 4, and a connecting guide rib 5. The outlet end of the nozzle body 1 is connected to the connecting guide rib 5. The device is characterized in that the first spray core 2, the second spray core 3, and the third spray core 4 are sequentially spaced within the connecting guide rib 5. The nozzle body 1 includes a straight pipe section 11 and a constricted pipe section 12. The first spray core 2 includes a first inlet hole 21 and a first outlet hole 22 connected in sequence. The second spray core 3 includes a second inlet hole 31 and a second outlet hole 32 connected in sequence. 2. The third nozzle 4 includes a third inlet hole 41, a transition cavity 42, and a third outlet hole 43 connected in sequence. The connecting guide rib 5 includes a first tapering section 51, a diffusing section 52, and a second tapering section 53 connected in sequence. The first inlet hole 21, the second inlet hole 31, and the third inlet hole 41 are tapering holes, and the first outlet hole 22 and the second outlet hole 32 are diffusing holes. Multiple third outlet holes 43 are distributed circumferentially. The outlet end of the third nozzle 4 is provided with a central sealing part 44. The taper of the inner circumferential surface of the first tapering section 51 matches / fits with and is the same as the taper of the outer circumferential surface of the constriction section 12. The taper of the inner circumferential surface of the diffusing section 52 matches / fits with and is the same as the taper of the outer circumferential surface of the first nozzle 2. The taper of the inner circumferential surface of the second tapering section 53 matches / fits with and is the same as the taper of the outer circumferential surfaces of the second nozzle 3 and the third nozzle 4.

[0024] The connecting guide vanes 5 are N in number, N≥4, preferably N≥8, and the N connecting guide vanes 5 are uniformly distributed in the circumferential direction, and the cross section of the connecting guide vanes 5 is airfoil-shaped, having the functions of connection and flow guidance.

[0025] Further, the straight pipe section 11 has an outer diameter D1, the first inlet hole 21 has a large diameter D2, the second inlet hole 31 has a large diameter D3, the third inlet hole 41 has a large diameter D4, and D1>D2>D3>D4.

[0026] The shrunk pipe section 12 has a main body outlet hole 13 with a diameter d1, the first outlet hole 22 has a large diameter d2, the second outlet hole 32 has a large diameter d3, and d1>d2>d3.

[0027] With respect to the central axis of the nozzle 20, the upper peripheral surface of the first spray core 2 has an inclination angle a1, the upper peripheral surface of the second spray core 3 has an inclination angle a2, the upper peripheral surface of the third spray core 4 has an inclination angle a3, the gradually expanding section 52 has an inclination angle a4, and the second gradually contracting section 53 has an inclination angle a5, and a1>a2>a3>a5>a4.

[0028] The lower end surface of the shrunk pipe section 12 and the upper end surface of the third spray core 4 have an axial direction height H, the lower end surface of the shrunk pipe section 12 and the upper end surface of the first spray core 2 have an axial direction height H1, the lower end surface of the first spray core 2 and the upper end surface of the second spray core 3 have an axial direction height H2, the lower end surface of the second spray core 3 and the upper end surface of the third spray core 4 have an axial direction height H3, and H>H1>H2>H3.

[0029] The tail gas treatment device for the anti-coking process of the waste heat steam boiler can effectively improve the atomization uniformity of the treatment liquid, make the particle size of the atomized liquid smaller, improve the reaction efficiency and effect of the treatment liquid and the tail gas, and improve the tail gas treatment efficiency and effect.

[0030] Further, D2=(0.27-0.37)D1, preferably 0.32, D3=(0.17-0.27)D1, preferably 0.22, and D4=(0.12-0.22)D1, preferably 0.17.

[0031] d2=(0.8-0.9)d1, preferably 0.85, d3=(0.7-0.8)d1, preferably 0.75, and d1=(0.3-0.4)D1, preferably 0.35.

[0032] a2=(0.7-0.8)a1, preferably 0.75, a3=(0.37-0.47)a1, preferably 0.42, a5=(0.25-0.35)a1, preferably 0.3, a4=(0.17-0.27)a1, preferably 0.22.

[0033] H1=(0.2-0.3)H, preferably 0.25, H2=(0.1-0.2)H, preferably 0.15, H3=(0.05-0.15)H, preferably 0.1.

[0034] The present application can further improve the atomization uniformity of the treatment liquid, make the atomized liquid particle size smaller, thereby better improve the reaction efficiency and effect of the treatment liquid and the tail gas, and improve the tail gas treatment efficiency and effect.

[0035] The present application can effectively improve the atomization uniformity of the treatment liquid, make the atomized liquid particle size smaller, thereby improve the reaction efficiency and effect of the treatment liquid and the tail gas, and improve the tail gas treatment efficiency and effect.

[0036] The above embodiments are illustrative of the present application, not limiting the present application, and it can be understood that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the protection scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A tail gas treatment device for an anti-coking process in a waste heat steam boiler, comprising a tail gas pipe (10) and a nozzle (20), wherein the nozzle is detachably installed on the pipe wall of the tail gas pipe, the nozzle is used to spray a treatment liquid into the tail gas pipe, the nozzle comprises a nozzle body (1), a first spray core (2), a second spray core (3), a third spray core (4), and a connecting guide rib (5), wherein the outlet end of the nozzle body is connected to the connecting guide rib; characterized in that: The connecting guide rib is connected to a first nozzle core, a second nozzle core, and a third nozzle core arranged in sequence at intervals. The nozzle body includes a straight tube section (11) and a converging tube section (12). The first nozzle core includes a first inlet hole (21) and a first outlet hole (22) connected in sequence. The second nozzle core includes a second inlet hole (31) and a second outlet hole (32) connected in sequence. The third nozzle core includes a third inlet hole (41), a transition chamber (42), and a third outlet hole (43) connected in sequence. The connecting guide rib includes a first converging section (51) and a expanding section connected in sequence. (52) Second tapered section (53); The first inlet hole, the second inlet hole, and the third inlet hole are tapered holes, the first outlet hole and the second outlet hole are expanding holes, and multiple third outlet holes are distributed circumferentially. The outlet end of the third nozzle is provided with a central sealing part (44). The taper of the inner circumferential surface of the first tapered section matches and is the same as the taper of the outer circumferential surface of the tube shrinking section. The taper of the inner circumferential surface of the expanding section matches and is the same as the taper of the outer circumferential surface of the first nozzle. The taper of the inner circumferential surface of the second tapered section matches and is the same as the taper of the outer circumferential surface of the second nozzle and the third nozzle. The straight pipe section has an outer diameter D1, the first inlet hole has a large diameter D2, the second inlet hole has a large diameter D3, and the third inlet hole has a large diameter D4, with D1 > D2 > D3 > D4; the constricted pipe section has a main outlet hole (13), the main outlet hole has a diameter d1, the first outlet hole has a large diameter d2, and the second outlet hole has a large diameter d3, with d1 > d2 > d3; relative to the central axis of the nozzle, the upper outer circumferential surface of the first nozzle core has an inclination angle a1, the upper outer circumferential surface of the second nozzle core has an inclination angle a2, and the upper outer circumferential surface of the third nozzle core... The outer peripheral surface has an inclination angle a3, the expanding section has an inclination angle a4, and the second contracting section has an inclination angle a5, with a1 > a2 > a3 > a5 > a4; the lower end face of the contracting section and the upper end face of the third nozzle have an axial height H, the lower end face of the contracting section and the upper end face of the first nozzle have an axial height H1, the lower end face of the first nozzle and the upper end face of the second nozzle have an axial height H2, and the lower end face of the second nozzle and the upper end face of the third nozzle have an axial height H3, with H > H1 > H2 > H3. There are N connecting guide ribs, N≥4, and the N connecting guide ribs are evenly distributed along the circumference. The cross-section of the connecting guide ribs is airfoil-shaped.

2. The tail gas treatment device for the anti-coking process of waste heat steam boiler as described in claim 1, characterized in that, D2=(0.27-0.37)D1, D3=(0.17-0.27)D1, D4=(0.12-0.22)D1.

3. The tail gas treatment device for the anti-coking process of waste heat steam boiler as described in claim 2, characterized in that, d2=(0.8-0.9)d1, d3=(0.7-0.8)d1, d1=(0.3-0.4)D1.

4. The tail gas treatment device for the anti-coking process of waste heat steam boiler as described in claim 3, characterized in that, a2=(0.7-0.8)a1, a3=(0.37-0.47)a1, a5=(0.25-0.35)a1, a4=(0.17-0.27)a1.

5. The tail gas treatment device for the anti-coking process of waste heat steam boiler as described in claim 4, characterized in that, H1=(0.2-0.3)H, H2=(0.1-0.2)H, H3=(0.05-0.15)H.

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