High-concentration process tail gas purification treatment equipment

Abstract

The utility model discloses high-concentration process tail gas purification treatment equipment, belongs to the technical field of tail gas purification treatment, and aims to solve the problems that due to the fact that the cooling effect of VOCS process tail gas in a main heat exchanger is uneven, solid VOCS intercepted on the inner wall of the heat exchanger is more and more, and the heat exchanger is prone to frost blockage or ice blockage. Comprising a main heat exchanger, a waste gas inlet pipe fixedly communicated with one side of the peripheral surface of the main heat exchanger, a nitrogen discharge pipe inserted in the middle position of the main heat exchanger in a penetrating manner, a discharge pipe fixedly communicated with the bottom of the main heat exchanger, and exhaust heads uniformly communicated with the two sides of the peripheral surface of the nitrogen discharge pipe, the nitrogen inlet pipe is arranged at the top of the nitrogen discharge pipe; the condition that excessive solid VOCS is attached to the inner wall of the main heat exchanger can be avoided, so that the solid VOCS can be discharged from the discharge pipe under the action of gravity, and normal operation of the main heat exchanger is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to tail gas purification treatment technical field, and specifically relates to a high concentration process tail gas purification treatment equipment. BACKGROUND

[0002] Typical waste gas is derived from chemical reaction production process and chemical storage and transportation production process, and its typical emission characteristics are high concentration, small air volume and large fluctuation. Therefore, the conventional treatment process mode will bring high process and safety risks when purifying and treating this type of harmful waste gas. Liquid nitrogen condensation method is a common process method for purifying and treating this type of waste gas, and a heat exchanger needs to be used in this type of treatment method.

[0003] The liquid nitrogen condensation method in the prior art makes the VOCS process tail gas from the pre-cooling heat exchanger enter the heat exchanger and exchange heat with the liquid nitrogen entering from the pipeline to further cool down. Most of the VOCS components are condensed and separated into liquid and solid in this process, and the non-condensable gas continues to be discharged to the cold side of the pre-cooling heat exchanger B. The liquid VOCS condensed and separated is discharged through the low point liquid discharge port of the main heat exchanger, and the part of the VOCS that becomes solid is left in the main heat exchanger. As the cooling effect of the VOCS process tail gas inside the main heat exchanger is uneven, the solid VOCS trapped on the inner wall of the heat exchanger increases over time, and frost or ice blocking of the heat exchanger may occur.

[0004] Therefore, there is a need for a high concentration process tail gas purification treatment equipment to solve the problem that the cooling effect of the VOCS process tail gas inside the main heat exchanger is uneven, which makes the solid VOCS trapped on the inner wall of the heat exchanger increase over time, and frost or ice blocking of the heat exchanger may occur. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a high concentration process tail gas purification treatment equipment to solve the problem raised in the background.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a high concentration process tail gas purification treatment equipment, comprising a main heat exchanger, a waste gas inlet pipe communicated and fixed on one side of the outer circumferential surface of the main heat exchanger, a nitrogen gas discharge pipe penetratingly inserted into the middle position of the main heat exchanger, a discharge pipe fixed and communicated at the bottom of the main heat exchanger, exhaust heads fixed and communicated uniformly on both sides of the outer circumferential surface of the nitrogen gas discharge pipe, a nitrogen gas inlet pipe arranged at the top of the nitrogen gas discharge pipe, and a movable cleaning mechanism.

[0007] The movable cleaning mechanism comprises a driving assembly and a contact assembly.

[0008] The contact assembly comprises connecting shafts fixed to the outer circumferential surface of the nitrogen discharge pipe on both ends of the exhaust head, scraper plates fixed to the outer circumferential surface of the two connecting shafts, a fixed plate fixed to the other side of the outer circumferential surface of the nitrogen discharge pipe on the top of the exhaust head, a rotating shaft penetratingly connected to the middle position of the fixed plate, a movable strip provided at the bottom of the rotating shaft, a limiting component supporting the impact plate, an opening penetratingly provided at the middle position of the movable strip, a resisting shaft inserted into the opening, and an impact plate fixed to one side of the movable strip.

[0009] It is worth mentioning that the driving assembly comprises a motor fixed to one side of the top of the main heat exchanger, a first gear fixedly sleeved on the outer circumferential surface of the output end of the motor and the outer circumferential surface of the main heat exchanger extending from the nitrogen discharge pipe, a sealing component acting on the middle position of the exhaust inlet pipe and the nitrogen discharge pipe, a plurality of gear rings fixed to the top of the inner cavity surface of the main heat exchanger and arranged in an equidistant ring around the main heat exchanger, a supporting shaft fixed to the bottom of the plurality of gear rings, and a second gear meshingly arranged on the inner circumferential surface of the supporting shaft, the middle position of the second gear being fixed to the outer circumferential surface of the rotating shaft, and the two first gears being meshingly connected.

[0010] Further, the top of the resisting shaft is fixed to the surface of the bottom of the rotating shaft, the outer circumferential surface of the resisting shaft is fitted to the inner wall of the opening, the surface of the impact plate away from the nitrogen discharge pipe is arranged in an arc shape, and the two ends of the surface of the scraper plate away from the nitrogen discharge pipe are arranged in an inclined surface.

[0011] Further, the limiting component comprises a connecting strip fixed to the two end surfaces of the fixed plate and arranged in an L shape, and two positioning shafts fixed to the surface of the connecting strip, the positioning shafts being slidably and sleevedly connected to the movable strip.

[0012] As a preferred embodiment, the limiting component further comprises a resisting opening provided in the nitrogen discharge pipe and a limiting rod penetratingly inserted into the middle position of the impact plate, one side of the limiting rod being fixed to the surface of the impact plate.

[0013] As a preferred embodiment, the sealing component comprises a limiting groove provided in the surface of the top of the nitrogen discharge pipe and arranged in a T shape, and a limiting ring inserted into the inner cavity of the limiting groove and arranged in a T shape, the top of the limiting ring penetrating through the limiting groove and being fixed to the surface of the bottom of the nitrogen inlet pipe.

[0014] As a preferred embodiment, the cold energy recovery mechanism acting on the main heat exchanger is further included, which comprises a cold energy recovery heat exchanger arranged on one side of the main heat exchanger, a booster fixed on the surface of the cold energy recovery heat exchanger, a recovery pipe fixedly communicated with one side surface of the cold energy recovery heat exchanger, and a backflow pipe fixedly communicated with the other side surface of the cold energy recovery heat exchanger, one side of the recovery pipe is fixedly and communicatively arranged with the main heat exchanger, one side of the backflow pipe is fixedly and communicatively arranged with the nitrogen gas inlet pipe, one end of the booster is fixedly and communicatively arranged with the inside of the exhaust pipe, and the other end of the booster is fixedly and communicatively arranged with the inside of the exhaust pipe.

[0015] Compared with the prior art, the high-concentration process tail gas purification treatment equipment provided by the utility model has at least the following beneficial effects:

[0016] (1) By starting the motor, the nitrogen exhaust pipe rotates, and the low-temperature nitrogen gas discharged from the exhaust head moves uniformly to the inner cavity of the main heat exchanger, so that the exhaust gas can be fully contacted to realize cooling treatment, and in the process, the impact plate will gradually impact the inner circumferential surface of the main heat exchanger and make the scraper rub the inner circumferential surface of the main heat exchanger, thereby avoiding the case that too much solid VOCS adheres to the inner wall of the main heat exchanger and is discharged from the exhaust pipe under the action of gravity, thereby ensuring the normal operation of the main heat exchanger.

[0017] (2) The cooperation of the cold energy recovery heat exchanger and the booster can recover the cold energy in the main heat exchanger, so that the hot nitrogen gas and the condensed non-condensable gas can be recycled, thereby further reducing the probability of frost or ice blockage in the main heat exchanger, and saving the defrosting energy consumption of the pre-cooling heat exchanger. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a front view of the utility model and a schematic diagram of the structure of the utility model;

[0019] Figure 2 It is a schematic diagram of the structure of the main heat exchanger in the utility model;

[0020] Figure 3 It is a schematic diagram of the structure of the main heat exchanger in the utility model; Figure 2 It is an enlarged schematic diagram of the structure of A in the utility model;

[0021] Figure 4 It is a schematic diagram of the structure of the nitrogen exhaust pipe in the utility model;

[0022] Figure 5 It is a schematic diagram of the structure of the nitrogen exhaust pipe in the utility model; Figure 4 It is an enlarged schematic diagram of the structure of B in the utility model.

[0023] In the figure: 1, main heat exchanger; 2, exhaust gas inlet pipe; 3, nitrogen discharge pipe; 4, nitrogen inlet pipe; 5, discharge pipe; 6, exhaust head; 7, motor; 8, first gear; 9, support shaft; 10, gear ring; 11, connecting shaft; 12, scraper; 13, impact plate; 14, abutting opening; 15, limiting rod; 16, fixed plate; 17, rotating shaft; 18, second gear; 19, connecting strip; 20, positioning shaft; 21, movable strip; 22, opening; 23, abutting shaft; 24, cold energy recovery heat exchanger; 25, return pipe; 26, recovery pipe; 27, supercharger; 28, limiting groove; 29, limiting ring. DETAILED DESCRIPTION

[0024] The following description is used to disclose the present application so that those skilled in the art can implement the present application. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious modifications.

[0025] Example 1

[0026] Referring to Figures 1-5 The present application provides a high-concentration process tail gas purification treatment equipment, which comprises a main heat exchanger 1, an exhaust gas inlet pipe 2 fixedly connected to one side of the outer circumferential surface of the main heat exchanger 1, a nitrogen discharge pipe 3 penetratingly inserted into the main heat exchanger 1 at the middle position, a discharge pipe 5 fixedly connected to the bottom of the main heat exchanger 1, exhaust heads 6 fixedly and uniformly connected to the outer circumferential surface of the nitrogen discharge pipe 3 on both sides, a nitrogen inlet pipe 4 arranged at the top of the nitrogen discharge pipe 3, and a movable cleaning mechanism.

[0027] The movable cleaning mechanism comprises a driving assembly and a contact assembly.

[0028] The nitrogen discharge pipe 3 can be rotated by the driving assembly, so that the low-temperature nitrogen gas entering the nitrogen discharge pipe 3 from the nitrogen inlet pipe 4 at the nitrogen inlet pipe 4 and being discharged from the exhaust head 6 in circular motion can be fully contacted with the process exhaust gas entering from the exhaust gas inlet pipe 2, thereby improving the cooling effect of the exhaust gas, and the inner circumferential surface of the main heat exchanger 1 can be subjected to frictional impact under the cooperation of the driving assembly and the cleaning assembly, thereby avoiding the situation that a large amount of solid VOCS adheres to the inner circumferential surface of the main heat exchanger 1, causing frost or ice blockage.

[0029] Referring to Figures 1-5The contact assembly comprises connecting shafts 11 fixed to the outer circumferential surface of the nitrogen discharge pipe 3 on both ends of the exhaust head 6, scraper plates 12 fixed to the surfaces on both sides of the connecting shafts 11, a fixed plate 16 fixed to the outer circumferential surface of the nitrogen discharge pipe 3 on the other side of the exhaust head 6, a rotating shaft 17 penetratingly connected to the middle position of the fixed plate 16, a movable strip 21 arranged at the bottom of the rotating shaft 17, a limiting component supporting the impact plate 13, an opening 22 penetratingly arranged at the middle position of the movable strip 21, a resisting shaft 23 inserted into the opening 22, and an impact plate 13 fixed to one side of the movable strip 21. The top of the resisting shaft 23 is fixed to the surface of the bottom of the rotating shaft 17, the outer circumferential surface of the resisting shaft 23 is in close contact with the inner wall of the opening 22, and the surface of the impact plate 13 away from the nitrogen discharge pipe 3 is arranged in an arc shape. The ends of the surface of the scraper plate 12 away from the nitrogen discharge pipe 3 are arranged in an inclined surface.

[0030] When the nitrogen discharge pipe 3 is rotating, the scraper plate 12 can slide along the inner circumferential surface of the main heat exchanger 1 under the driving of the connecting shaft 11. Due to the shape of the scraper plate 12, the scraper plate 12 can scrape off the solid VOCS adhering to the inner circumferential surface of the main heat exchanger 1 and make it fall to the bottom of the inner wall of the main heat exchanger 1. The rotating shaft 17 can rotate under the driving of the rotating cooperation component of the nitrogen discharge pipe 3, so that the resisting shaft 23 can make a circular motion, so that the movable strip 21 can make a reciprocating motion along the horizontal direction under the resisting action of the inner wall of the opening 22 and the action of the limiting component, so that the impact plate 13 can make a reciprocating motion, so that the impact plate 13 can gradually impact the inner circumferential surface of the main heat exchanger 1 when the nitrogen discharge pipe 3 is rotating, so that the blocky solid VOCS adhering to the inner circumferential surface of the main heat exchanger 1 can be broken and separated from the inner circumferential surface of the main heat exchanger 1.

[0031] Please refer to Figures 1-5 The limiting component comprises connecting strips 19 fixed to the surfaces of both ends of the fixed plate 16 and arranged in an L shape, and two positioning shafts 20 fixed to the surfaces of the connecting strips 19, which are connected to the movable strip 21 in a sliding sleeve manner.

[0032] Please refer to Figures 1-5 The limiting component further comprises a resisting opening 14 arranged on the nitrogen discharge pipe 3, and a limiting rod 15 penetratingly inserted into the middle position of the impact plate 13, one side of which is fixed to the surface of the impact plate 13.

[0033] The movable strip 21 can only slide horizontally along the outer circumferential surface of the positioning shaft 20 under the supporting action of the positioning shaft 20, so as to limit the movement track of the movable strip 21, so that the movable strip 21 and the impact plate 13 can only move along the horizontal direction. The limiting effect of the inner wall of the resisting opening 14 on the limiting rod 15 makes the movement track of the impact plate 13 more stable.

[0034] Please refer to Figures 1-5 The driving assembly comprises a motor 7 fixed to one side of the top of the main heat exchanger 1, a first gear 8 fixedly sleeved on the outer circumferential surface of the output end of the motor 7 and the outer circumferential surface of the main heat exchanger 1 at the extension of the nitrogen discharge pipe 3, a sealing component acting on the intermediate position of the exhaust gas inlet pipe 2 and the nitrogen discharge pipe 3, a plurality of gear rings 10 fixed to the top of the inner cavity surface of the main heat exchanger 1 and arranged in equidistant circumferential distribution, a support shaft 9 fixed to the bottom of the plurality of gear rings 10, and a second gear 18 meshingly arranged on the inner circumferential surface of the support shaft 9, the intermediate position of the second gear 18 being fixed to the outer circumferential surface of the rotating shaft 17, and the two first gears 8 being meshingly connected.

[0035] When the motor 7 is started to drive the first gear 8 to rotate, the nitrogen discharge pipe 3 can be rotated under the meshing action between the two first gears 8, the sealing component can make the nitrogen inlet pipe 4 not affected when the nitrogen discharge pipe 3 rotates, and the low-temperature nitrogen can be smoothly delivered to the inner cavity of the nitrogen discharge pipe 3. When the nitrogen discharge pipe 3 rotates, the fixed plate 16 makes a circular motion, so that the second gear 18 can mesh with the support shaft 9 to make the rotating shaft 17 rotate.

[0036] Please refer to Figures 1-5 The sealing component comprises a limiting groove 28 with a T-shaped cross-section arranged on the top surface of the nitrogen discharge pipe 3 and a limiting ring 29 with a T-shaped cross-section arranged in the inner cavity of the limiting groove 28, the top of the limiting ring 29 penetrating through the limiting groove 28 and being fixed to the surface of the bottom of the nitrogen inlet pipe 4.

[0037] The spacing between the nitrogen discharge pipe 3 and the nitrogen inlet pipe 4 will not change to ensure the sealing effect when the nitrogen discharge pipe 3 and the nitrogen inlet pipe 4 are connected, and the nitrogen inlet pipe 4 fixed to the low-temperature nitrogen delivery pipe will not be affected when the nitrogen discharge pipe 3 rotates. The limiting groove 28 and the limiting ring 29 can limit the movement trajectory and make the movement more stable.

[0038] Example 2

[0039] Further in the embodiment, please refer to Figures 1-5As shown, the cold energy recovery mechanism acting on the main heat exchanger 1 includes a cold energy recovery heat exchanger 24 arranged on one side of the main heat exchanger 1, a booster 27 fixed to the surface of the cold energy recovery heat exchanger 24, a recovery pipe 26 fixedly connected to the surface on one side of the cold energy recovery heat exchanger 24, and a backflow pipe 25 fixedly connected to the surface on the other side of the cold energy recovery heat exchanger 24. One side of the recovery pipe 26 is fixedly connected to the main heat exchanger 1, one side of the backflow pipe 25 is fixedly connected to the nitrogen gas inlet pipe 4, one end of the booster 27 is fixedly connected to the inside of the discharge pipe 5, and the other end of the booster 27 is fixedly connected to the inside of the discharge pipe 5.

[0040] The nitrogen gas that has been heated from low temperature to normal temperature by the main heat exchanger 1 is pressurized by the booster 27 after entering the cold energy recovery heat exchanger 24, and the nitrogen gas exchanges heat with the non-condensable gas in the cold energy recovery heat exchanger 24, and the nitrogen gas is re-delivered to the temple of the nitrogen gas inlet pipe 4 from the backflow pipe 25, thereby realizing the recovery and utilization of cold energy.

[0041] The main heat exchanger 1: The process tail gas enters from the exhaust gas inlet pipe 2 and exchanges heat with the low-temperature nitrogen gas discharged from the rotating nitrogen gas discharge pipe 3. The condensed and purified tail gas after heat exchange, and the non-condensable gas is discharged from the discharge pipe 5.

[0042] The movable cleaning mechanism: The nitrogen gas discharge pipe 3 is rotated by the driving assembly, the scraper 12 in the contact assembly scrapes off the solid VOCs on the inner wall of the main heat exchanger 1, and the impact plate 13 breaks the blocky solid VOCs by reciprocating motion.

[0043] The cold energy recovery mechanism: The nitrogen gas discharged from the discharge pipe 5 of the main heat exchanger 1 is pressurized by the booster 27 and enters the cold energy recovery heat exchanger 24, exchanges heat with the non-condensable gas, and then flows back to the nitrogen gas inlet pipe 4 through the backflow pipe 25.

[0044] Transmission structure protection: The sealing cover seals the transmission structure of the second gear 18 and the gear ring 10, preventing impurities and solid VOCs from entering.

Claims

1. A high-concentration process tail gas purification and treatment device, comprising a main heat exchanger (1), a waste gas inlet pipe (2) connected and fixed to one side of the outer peripheral surface of the main heat exchanger (1), a nitrogen discharge pipe (3) inserted through and inserted at the middle position of the main heat exchanger (1), a discharge pipe (5) fixedly connected to the bottom of the main heat exchanger (1), exhaust heads (6) uniformly connected and fixed to both sides of the outer peripheral surface of the nitrogen discharge pipe (3), and a nitrogen inlet pipe (4) disposed at the top of the nitrogen discharge pipe (3), characterized in that, It also includes organizations for event cleanup; The active cleaning mechanism includes a drive component and a contact component; The contact assembly includes a connecting shaft (11) fixed to one side of the outer peripheral surface of the nitrogen discharge pipe (3) at the upper and lower ends of the exhaust head (6), a scraper (12) fixed to the two sides of the connecting shaft (11), a fixing plate (16) fixed to the other side of the outer peripheral surface of the nitrogen discharge pipe (3) at the top of the exhaust head (6), a rotating shaft (17) rotatably connected to the middle position of the fixing plate (16), a movable strip (21) provided at the bottom of the rotating shaft (17), a limiting component supporting the impact plate (13), an opening (22) opened through the middle position of the movable strip (21), an abutment shaft (23) inserted into the opening (22), and an impact plate (13) fixed to one side of the movable strip (21).

2. The high-concentration process tail gas purification and treatment equipment according to claim 1, characterized in that: The drive assembly includes a motor (7) fixed to one side of the top of the main heat exchanger (1), a first gear (8) fixedly sleeved on the outer peripheral surface of the main heat exchanger (1) at the extension of the nitrogen discharge pipe (3) and the outer peripheral surface of the output end of the motor (7), a sealing component acting at the middle position between the exhaust gas inlet pipe (2) and the nitrogen discharge pipe (3), a plurality of toothed rings (10) fixed to the top of the inner cavity surface of the main heat exchanger (1) and arranged in a equidistant ring, a support shaft (9) fixed to the bottom of the plurality of toothed rings (10), and a second gear (18) meshing with the inner peripheral surface of the support shaft (9). The middle position of the second gear (18) is fixed to the outer peripheral surface of the rotating shaft (17), and the two first gears (8) are meshed together.

3. The high-concentration process tail gas purification and treatment equipment according to claim 1, characterized in that: The top of the abutting shaft (23) is fixed to the bottom surface of the rotating shaft (17), the outer peripheral surface of the abutting shaft (23) is in contact with the inner wall of the opening (22), the surface of the impact plate (13) away from the nitrogen discharge pipe (3) is arc-shaped, and the two ends of the surface of the scraper (12) away from the nitrogen discharge pipe (3) are inclined.

4. The high-concentration process tail gas purification and treatment equipment according to claim 3, characterized in that: The limiting fastener includes an L-shaped connecting strip (19) fixed to both ends of the fixed plate (16) and two positioning shafts (20) fixed to the surface of the connecting strip (19). The positioning shafts (20) and the movable strip (21) are slidably connected.

5. The high-concentration process tail gas purification and treatment equipment according to claim 4, characterized in that: The limiting fastener also includes an abutment port (14) opened in the nitrogen emission pipe (3) and a limiting rod (15) inserted through the middle position of the impact plate (13), one side of the limiting rod (15) being fixed to the surface of the impact plate (13).

6. The high-concentration process tail gas purification and treatment equipment according to claim 2, characterized in that: The sealing component has a T-shaped limiting groove (28) on the top surface of the nitrogen discharge pipe (3) and a T-shaped limiting ring (29) inserted into the inner cavity of the limiting groove (28). The top of the limiting ring (29) passes through the limiting groove (28) and is fixed to the bottom surface of the nitrogen inlet pipe (4).

7. The high-concentration process tail gas purification and treatment equipment according to claim 1, characterized in that: It also includes a cold energy recovery mechanism acting on the main heat exchanger (1). The cold energy recovery mechanism includes a cold energy recovery heat exchanger (24) disposed on one side of the main heat exchanger (1), a booster (27) fixed on the surface of the cold energy recovery heat exchanger (24), a recovery pipe (26) connected to and fixed on one side of the surface of the cold energy recovery heat exchanger (24), and a return pipe (25) connected to and fixed on the other side of the surface of the cold energy recovery heat exchanger (24). One side of the recovery pipe (26) is connected to and fixedly disposed with the main heat exchanger (1), one side of the return pipe (25) is connected to and fixedly disposed with the nitrogen inlet pipe (4), one end of the booster (27) is connected to and fixedly disposed with the interior of the discharge pipe (5), and the other end of the booster (27) is connected to and fixedly disposed with the interior of the discharge pipe (5).

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