Environment-friendly coking flue gas treatment hot air device

Abstract

The invention discloses an environment-friendly coking flue gas treatment hot air device which structurally comprises a cloth bag dust removal box, a desulfurization system, a quench tower, a hot air device body, a connection box, a chimney, a denitration system and a smoke collection box, the smoke collection box collects flue gas and conveys the flue gas to the quench tower through a pipeline, and the quench tower is connected with the desulfurization system through a pipeline; the cloth bag dust removal box is installed between the desulfurization system and the denitration system, the denitration system conveys to the chimney and the connecting boxes through the three-way valve, the two connecting boxes are connected to the two ends of the hot air device, and the hot air device optimizes a flue gas flowing path to achieve flue gas purification. Nanoscale agglomerates are guided to the surface of the movable body on the back face to be enriched when flowing through the heat exchange pipe instead of being directly attached to the outer wall of the heat exchange pipe, the movable body is designed in a movable mode, and after flue gas treatment is completed, the surface agglomerates are mechanically scraped away through the scraping rod. The problems of heat exchange efficiency reduction and pipe body corrosion caused by accumulation of agglomerates are effectively avoided, and the service life of the heat exchange pipe is remarkably prolonged.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of flue gas treatment, more specifically, especially to an environmental protection coking flue gas treatment hot air device. BACKGROUND

[0002] The environmental protection coking flue gas treatment is a comprehensive technical system combining source control, process optimization and end treatment for pollutants generated in the coking production process, which realizes ultra-low emission of flue gas through source reduction means such as low-sulfur coal selection, coal gas desulfurization, low-nitrogen combustion, combined with multi-stage purification processes such as wet / dry desulfurization, SCR / SNCR denitrification, bag dust removal, etc.

[0003] The heat exchange pipe is internally connected with cold air and externally contacted with high-temperature flue gas. Due to the significant temperature difference between the front and back of the pipe body, the temperature of the back area is relatively low, which easily promotes the agglomeration and condensation of the nanometer particles in the flue gas that have not been treated. These agglomerates not only gradually accumulate on the surface of the heat exchange pipe, reducing its heat exchange efficiency and affecting the heat exchange efficiency of the heat exchange pipe, but also may form larger condensate blocks due to continuous accumulation, thereby causing local stress concentration or blockage risk to the pipe structure, ultimately affecting the long-term stable operation of the system. SUMMARY

[0004] In order to solve the above technical problems, the purpose and effect of the present application, an environmental protection coking flue gas treatment hot air device, are achieved by the following specific technical means: Its structure includes a bag dust removal box, a desulfurization system, a quenching tower, a hot air device, a connecting box, a chimney, a denitrification system, and a smoke collection box. The smoke collection box collects flue gas through a pipeline to the quenching tower. The quenching tower is connected to the desulfurization system through a pipeline. The bag dust removal box is installed between the desulfurization system and the denitrification system. The denitrification system is transported to the chimney and the connecting box through a three-way valve. The connecting box is provided with two ends connected to the hot air device. The hot air device includes a flow guide, a heat exchange pipe, a protective shell, an inlet, a pull plate, a woven belt, a movable body, and an outlet. The flow guide and the protective shell are integrated. The heat exchange pipe is connected between the inlet and the outlet. The pull plate is detachable at the bottom of the protective shell. The woven belt is wound on the surface of the heat exchange pipe. The movable body is installed on the surface of the heat exchange pipe. The movable body includes a limiting channel, a ceramic layer, a scraping rod, a fixed shell, a moving channel, a sliding block, an elastic steel plate, and a support block. The sliding block moves in the limiting channel. The sliding block and the ceramic layer are integrated. The scraping rod is provided with a moving channel on both sides. The elastic steel plate is arranged on the outer surface of the scraping rod. The elastic steel plate is installed in the fixed shell. The support block and the ceramic layer are integrated. The ceramic layer is a high-temperature-resistant ceramic layer material, which can make the nanoscale gather together at low temperature, the elastic steel plate can push the scraper back to the original position when the pushing force of the scraper is lost, the ceramic layer is in an inclined state at the bottom of the limiting channel when the hot smoke is not pushed, the scraper is made of silicon nitride, the surface of the ceramic layer can guide the direction of the hot smoke to push the scraper, and the woven belt and the movable body are installed on the surface of each heat exchange pipe in the protective shell.

[0005] As a further improvement of the application, the limiting channel is located on both sides of the ceramic layer, the ceramic layer is located on the back of the heat exchange pipe when the hot smoke moves, the nanoscale substance is reassembled at low temperature, the ceramic layer has a V-shaped structure, the fixed shell limits the maximum expansion range of the elastic steel plate, the limiting channel is fixed on the surface of the heat exchange pipe, the ceramic layer can easily slide on the limiting channel under the force of the hot smoke flow, and the movable body is made of high-temperature-resistant material.

[0006] As a further improvement of the application, the pull-out plate comprises a tray, a pull rod and a closing strip, the pull rod is integrated with the tray and penetrates through the closing strip, the closing strip abuts against the surface of the protective shell, the tray is located below the heat exchange pipe, and the tray receives the nanoscale agglomerates scraped off.

[0007] As a further improvement of the application, the scraper can scrape off the nanoscale agglomerates when moving along the ceramic layer, the four scrapers are a group and have a symmetrical structure, the scraper has a triangular structure, the ceramic layer swings to the side when the hot smoke moves, and the ceramic layer is inclined and stationary downward when the hot smoke does not move.

[0008] As a further improvement of the application, the woven belt is made of chromium-nickel-iron alloy material, has ductility and is resistant to high temperature, the woven belt is wrapped on the surface of the heat exchange pipe in a screw cross shape, and the woven belt can absorb the radial thermal expansion of the pipeline by 3%-5%.

[0009] As a further improvement of the application, the woven belt comprises a fixed ring and a winding strip, the winding strip is connected with the fixed ring at both ends, the fixed ring and the winding strip are fixed on the surface of the heat exchange pipe, the winding strip is formed by two cross-wound strips, and each group of the fixed ring has two annular structures.

[0010] Compared with the prior art, the application has the following beneficial effects: Firstly, the hot air device optimizes the smoke flow path, so that the nanoscale agglomerates are guided to the surface of the movable body on the back of the heat exchange pipe when flowing through the heat exchange pipe, rather than being directly attached to the outer wall of the heat exchange pipe, the movable body is designed to be movable, the surface agglomerates are mechanically scraped off by the scraper after the smoke treatment is completed, the problem of heat exchange efficiency reduction and pipe corrosion caused by agglomerate accumulation is effectively avoided, and the service life of the heat exchange pipe is significantly prolonged.

[0011] Secondly, the movable body realizes dynamic response through the limiting path, the ceramic layer moves along the back of the heat exchange pipe under the driving of the flue gas flow, the low thermal conductivity of the movable body promotes the agglomeration of the nano-particles, when the system stops running, the movable body automatically inclines and is fixed in the inclined position through the sliding block, and the elastic return movement of the scraper rod realizes the complete scraping of the agglomerates, the inclined structure further utilizes the gravity to assist the sliding of the agglomerates to the tray, and high-efficiency self-cleaning is realized.

[0012] Thirdly, the outer surface of the heat exchange pipe adopts the combined structure of the spiral winding strip and the fixed ring, the winding strip absorbs the radial thermal stress through elastic deformation, while inhibiting the axial deformation of the pipe body, the fixed ring applies pre-tightening force to the winding strip, and the structural stability and the uniformity of heat conduction are ensured, the design effectively improves the anti-creep ability and fatigue strength of the heat exchange pipe under extreme cold and hot alternating conditions, and the heat exchange efficiency and mechanical reliability are considered. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structural schematic view of an environment-friendly coking flue gas treatment device.

[0014] Figure 2 It is a structural schematic view of a hot air device.

[0015] Figure 3 It is a sectional structural schematic view of a hot air device.

[0016] Figure 4 It is a structural schematic view of a movable body.

[0017] Figure 5 It is a sectional structural schematic view of a movable body.

[0018] Figure 6 It is a structural schematic view of a pull plate.

[0019] Figure 7 It is a structural schematic view of a woven belt.

[0020] In the figure: the cloth bag dust removal box is 1, the desulfurization system is 2, the quenching tower is 3, the hot air device is 4, the connecting box is 5, the chimney is 6, the denitration system is 7, the smoke collection box is 8, the drainage channel is 41, the heat exchange pipe is 42, the protective shell is 43, the inlet is 44, the pull plate is 45, the woven belt is 46, the movable body is 47, the outlet is 48, the limiting path is 71, the ceramic layer is 72, the scraper rod is 73, the fixed shell is 74, the moving path is 75, the sliding block is 76, the elastic steel plate is 77, the supporting block is 78, the tray is 51, the pull rod is 52, the closing strip is 53, the fixed ring is 61, and the winding strip is 62. DETAILED DESCRIPTION

[0021] The application will be further described below with reference to the drawings: Embodiment 1: as shown in the accompanying Figure 1 to the accompanying Figure 6 : The present application provides a kind of environmental protection coking flue gas management hot blast device, its structure includes cloth bag dust removal box 1, desulfurization system 2, quenching tower 3, hot blast device 4, link box 5, chimney 6, denitration system 7, smoke collection box 8, the smoke collection box 8 is gathered by pipeline to quenching tower 3 with flue gas, the quenching tower 3 is connected with desulfurization system 2 by pipeline, the cloth bag dust removal box 1 is installed between desulfurization system 2 and denitration system 7, the denitration system 7 is transported to chimney 6 and link box 5 respectively by three-way valve, the link box 5 is equipped with two ends connected with hot blast device 4; The hot blast device 4 includes flow guide channel 41, heat exchange pipe 42, protective shell 43, access 44, pull plate 45, braided belt 46, movable body 47, exit 48, the flow guide channel 41 and protective shell 43 are integrated structure, the heat exchange pipe 42 is connected between access 44 and exit 48, the pull plate 45 is at the bottom of protective shell 43 and can be loaded and unloaded, the braided belt 46 is wound on the surface of heat exchange pipe 42, the movable body 47 is installed on the surface of heat exchange pipe 42; The movable body 47 includes limiting channel 71, ceramic layer 72, scraper rod 73, fixed shell 74, moving channel 75, sliding block 76, elastic steel plate 77, support block 78, the sliding block 76 moves in limiting channel 71, the sliding block 76 and ceramic layer 72 are integrated structure, the moving channel 75 is installed on the left and right sides of scraper rod 73, the elastic steel plate 77 is against the outer surface of scraper rod 73, the elastic steel plate 77 is installed in fixed shell 74, the support block 78 and ceramic layer 72 are integrated structure; The ceramic layer 72 is high-temperature-resistant ceramic layer material, which can gather nanoscale particles at low temperature, the elastic steel plate 77 can push it back to its original position when the scraper rod 73 loses thrust, the ceramic layer 72 is in an inclined state at the bottom end of the limiting channel 71 when there is no hot smoke to push, the scraper rod 73 is made of silicon nitride, the surface of the ceramic layer 72 can guide the direction of hot smoke to push the scraper rod 73, the braided belt 46 and the movable body 47 are installed on the surface of each heat exchange pipe 42 in the protective shell 43, and the flow guide channel 41 guides the flow direction of hot smoke.

[0022] The limiting path 71 is on both sides of the ceramic layer 72, the ceramic layer 72 is on the back of the heat smoke passing through the heat exchange pipe 42 in the heat smoke movement process, so that the nanoscale substance is reassembled at low temperature, the ceramic layer 72 is in V-shaped structure, the fixed shell 74 limits the maximum expansion range of the elastic steel plate 77, the limiting path 71 is fixed on the surface of the heat exchange pipe 42, the ceramic layer 72 can slide on the limiting path 71 easily under the force of the heat smoke flow, the movable body 47 is made of high-temperature resistant material, and the drainage path 41 is arranged on the inner wall of the protective shell 43.

[0023] The pull rod 52 penetrates the closing strip 53 and is integrated with the tray 51, the closing strip 53 abuts against the surface of the protective shell 43, the tray 51 is below the heat exchange pipe 42, the tray 51 receives the nanoscale agglomerates scraped off, and the space on both sides of the closing strip 53 avoids leakage at the joint.

[0024] The scraper 73 can scrape off the nanoscale agglomerates when moving along the ceramic layer 72, the four scrapers 73 are a group and are in symmetrical structure, the scraper 73 is in triangular structure, the ceramic layer 72 swings to the side when the heat smoke moves, and is inclined to be stationary downward when the heat smoke does not move, and the sliding block 76 is in arc structure and can move in the limiting path 71 smoothly.

[0025] The woven belt 46 is made of chrome-nickel-iron alloy material, has ductility and is resistant to high temperature, the woven belt 46 is in screw cross shape and is wrapped on the surface of the heat exchange pipe 42, the woven belt 46 can absorb the radial thermal expansion of ±3%-5% of the pipe, and the woven belt 46 is in spiral shape and is wound on the surface of the heat exchange pipe 42.

[0026] The specific use mode and effect of the embodiment are as follows: In this invention, the flue gas collection box 8 first collects the coking flue gas and transports it to the quench tower 3 for cooling. Then, it is introduced into the desulfurization system 2 via pipeline for desulfurization. The purified flue gas enters the bag filter dust collector 1 for dust removal, and then is transported to the denitrification system 7 via pipeline for denitrification. After denitrification, the flue gas is diverted through a three-way valve; one part is directly discharged into the chimney 6, and the other part enters the hot air device 4 via the connecting box 5. During this process, a cooler introduces ambient temperature air through the inlet 44, and the airflow is transported to the outlet 48 via the heat exchange tube 42. When the flue gas flows through the protective shell 43, its heat is absorbed and transferred by the heat exchange tube 42. The flue gas flow pushes the ceramic layer 72 of the moving body 47 along the limiting channel 71 towards the heat exchange tube 42. As the flue gas moves along the surface of the ceramic layer 72, the scraper 73 is pushed by the elastic steel plate 77 to the end of the ceramic layer. Due to the low thermal conductivity of the ceramic layer 72, the low temperature environment on its surface promotes the agglomeration and deposition of nanoscale materials in the flue gas. After treatment, the flue gas is transported to the chimney 6 for discharge. The flue gas thrust disappears, and the scraper 73 returns along the moving path 75 under the reset action of the elastic steel plate 77, scraping off the surface agglomerates. At the same time, the ceramic layer 72 moves down along the limiting path 71 through the sliding block 76 and is in an inclined state, so that the scraped material is collected in the tray 51. Finally, it is pulled out and cleaned by the pull rod 52. Through multi-stage purification and intelligent ash removal design, the system achieves efficient synergy between flue gas treatment and waste heat recovery.

[0027] Example 2: As shown in the attached document Figure 7 As shown: The braided tape 46 includes a fixing ring 61 and a winding strip 62. The winding strip 62 is connected to the fixing ring 61 at both ends. The fixing ring 61 and the winding strip 62 are fixed to the surface of the heat exchange tube 42. The winding strip 62 is formed by two cross-wound strips. Each group of fixing rings 61 has two rings in a circular structure. The winding strip 62 itself is elastic.

[0028] The specific usage and function of this embodiment are as follows: In this invention, the heat exchange tube 42 of the hot air device 4 adopts an internal and external temperature difference heat exchange design: the internal part flows with cold air medium, and the external surface contacts high-temperature flue gas to achieve forced heat exchange. In order to prevent the heat exchange tube 42 from excessive deformation due to hot and cold alternation, a spiral winding strip 62 is spirally wound on the outer surface of the tube. This structure effectively buffers radial thermal stress through elastic deformation, while limiting the axial expansion and contraction deformation of the tube body. The two ends of the winding strip 62 are fixed by high-strength fixing rings 61, which not only ensures heat conduction efficiency, but also maintains the stability of the tube body structure. This design significantly improves the fatigue resistance and service life of the heat exchange tube 42 under extreme temperature difference conditions.

[0029] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solutions described in this invention, or by designing similar technical solutions by those skilled in the art under the inspiration of the technical solutions described in this invention, falls within the protection scope of this invention.

Claims

1. An environmentally friendly coking flue gas treatment hot air device, which structure comprises a bag dust removal box (1), a desulfurization system (2), a quenching tower (3), a hot air device (4), a connecting box (5), a chimney (6), a denitration system (7), and a smoke collection box (8), wherein the smoke collection box (8) collects flue gas and delivers it to the quenching tower (3) through a pipeline, the quenching tower (3) is connected with the desulfurization system (2) through a pipeline, the bag dust removal box (1) is installed between the desulfurization system (2) and the denitration system (7), the denitration system (7) is delivered to the chimney (6) and the connecting box (5) through a three-way valve, respectively, the connecting box (5) is provided with two ends connected with the hot air device (4), and the hot air device (4) comprises a flow guide channel (41), a heat exchange pipe (42), a protective shell (43), an inlet (44), a pull plate (45), a woven belt (46), a movable body (47), and an outlet (48), wherein the flow guide channel (41) and the protective shell (43) are integrated, the heat exchange pipe (42) is connected between the inlet (44) and the outlet (48), the pull plate (45) is detachably arranged at the bottom of the protective shell (43), the woven belt (46) is wound on the surface of the heat exchange pipe (42), and the movable body (47) is arranged on the surface of the heat exchange pipe (42). The movable body (47) comprises a limiting channel (71), a ceramic layer (72), a scraping rod (73), a fixed shell (74), a moving channel (75), a sliding block (76), an elastic steel plate (77), and a supporting block (78), wherein the sliding block (76) moves in the limiting channel (71), the sliding block (76) and the ceramic layer (72) are integrated, the scraping rod (73) is provided with the moving channel (75) on the left and right sides, the elastic steel plate (77) abuts against the outer surface of the scraping rod (73), the elastic steel plate (77) is arranged in the fixed shell (74), and the supporting block (78) and the ceramic layer (72) are integrated. The ceramic layer (72) is made of high-temperature-resistant ceramic material, can make nanoscale substances gather together at low temperature, the elastic steel plate (77) can push the scraping rod (73) back to the original position when the scraping rod (73) loses the pushing force, the ceramic layer (72) is in an inclined state at the bottom end of the limiting channel (71) when it is not pushed by hot smoke, the scraping rod (73) is made of silicon nitride, and the surface of the ceramic layer (72) can guide the direction of hot smoke to push the scraping rod (73). The limiting channel (71) is arranged on the two sides of the ceramic layer (72), the ceramic layer (72) is arranged on the back of the heat exchange pipe (42) during the movement of hot smoke, so that nanoscale substances reassemble at low temperature, the ceramic layer (72) has a V-shaped structure, the fixed shell (74) limits the maximum expansion range of the elastic steel plate (77), the limiting channel (71) is fixed on the surface of the heat exchange pipe (42), and the ceramic layer (72) can easily slide on the limiting channel (71) under the force of hot smoke flow.

2. The environment-friendly hot air device for coking gas treatment according to claim 1, characterized in that: ​ 3. The hot air device for treating coking flue gas according to claim 1, characterized in that: The draw plate (45) comprises a tray (51), a pull rod (52) and a closing strip (53), the pull rod (52) is integrated with the tray (51) through the closing strip (53), the closing strip (53) is abutted against the surface of the protective shell (43), and the tray (51) is below the heat exchange pipe (42).

4. The hot air device for treating coking flue gas according to claim 1, characterized in that: When the scraping rod (73) moves along the ceramic layer (72), the nanoscale agglomerates are scraped off, the four scraping rods (73) are symmetrically arranged, and the scraping rod (73) is in a triangular structure.

5. The hot air device for treating coking flue gas according to claim 1, characterized in that: The woven belt (46) is made of a chrome-nickel-iron alloy material, has ductility and high temperature resistance, and is in a screw cross shape and wrapped on the surface of the heat exchange pipe (42).

6. The hot air device for treating coking flue gas according to claim 1, characterized in that: The woven belt (46) comprises a fixed ring (61) and a winding strip (62), the two ends of the winding strip (62) are connected with the fixed ring (61), the fixed ring (61) and the winding strip (62) are fixed on the surface of the heat exchange pipe (42), and the winding strip (62) is formed by two cross winding strips.

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