PTA oxidation tail gas combustion purification system

Abstract

The present application relates to a kind of PTA oxidation tail gas combustion purification system, including low-temperature catalytic combustor, PTA tail gas conveying device, air purification unit total air inlet control valve, purifier heating inlet pipeline, first heating gas inlet valve, first air purifier, first heating gas outlet valve, condenser, second inlet valve, second air purifier, second outlet valve, purifier outlet pipeline, PTA user interface, polyester user interface, third regulating valve, regeneration gas inlet pipeline, first regulating valve, first regeneration exhaust valve, scrubbing tower, low-pressure user interface;Heater, first air purifier and second air purifier are all sleeve type structure;The shell side of first air purifier and second air purifier is filled with filler;Low-temperature catalytic combustor includes heater and catalytic combustion reaction chamber.The present application reduces harmful and corrosive substances in tail gas, and the treated tail gas can replace nitrogen, reduces procurement cost, increases system stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas purification system, in particular to a PTA oxidation tail gas combustion purification system. BACKGROUND

[0002] During the operation of the downstream polyester device, nitrogen is required to be used as a bunker loosening gas or nitrogen sealing treatment is required to be performed by using nitrogen, and the consumption of nitrogen is large, and the nitrogen is often obtained by purchase, and the cost is high. The PTA oxidation tail gas is an organic waste gas containing various pollutants discharged from the oxidation reactor, and is the largest harmful gas discharged by the PTA device. The volume fraction of the main component nitrogen of the gas is about 94%, and if the PTA oxidation tail gas is used in the downstream polyester device, the cost can be greatly reduced. However, after the tail gas generated by the PTA device is treated by the traditional technology, there are still a small amount of strong corrosive substances and harmful substances in the tail gas, and the downstream polyester device is mostly made of carbon steel and 304 material, and if the tail gas is used, corrosion may occur, and there is a safety hazard.

[0003] In order to solve the above problems, patent CN102824813A discloses a PTA device oxidation tail gas treatment process, which uses a high-pressure absorption tower to absorb the organic matter in the tail gas. The high-pressure absorption tower is divided into two sections, the upper section is washed with desalted water, and the gas phase components after washing are introduced into the tail gas main pipe through the gas outlet of the upper section of the high-pressure absorption tower. The lower section of the high-pressure absorption tower uses an alkaline solution as a spray to absorb the corrosive bromide ions in the tail gas. The liquid phase components after treatment are discharged through the liquid outlet at the bottom of the high-pressure absorption tower. Although the high-pressure absorption tower can absorb the corrosive components in the tail gas, and avoid the corrosion of the oxidation tail gas pipeline, the equipment is relatively complex, and the heat of the PTA oxidation tail gas cannot be fully utilized. SUMMARY

[0004] The purpose of the present application is to solve the problems existing in the prior art, and to provide a PTA oxidation tail gas combustion purification system.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0006] A PTA oxidation tail gas combustion purification system, comprising a low-temperature catalytic combustor, a PTA tail gas conveying device, an air purification unit total gas inlet control valve, a purifier heating gas inlet pipeline, a first heating gas inlet valve, a first air purifier, a first heating gas outlet valve, a condenser, a second gas inlet valve, a second air purifier, a second gas outlet valve, a purifier gas outlet pipeline, a PTA user interface, a polyester user interface, a third regulating valve, a regenerative gas inlet pipeline, a first regulating valve, a first regenerative gas outlet valve, a washing tower, and a low-pressure user interface.

[0007] The heater, the first air purifier and the second air purifier are all in a double-pipe structure; the shell side of the first air purifier and the second air purifier is filled with a filler, which is an adsorbent or a desiccant;

[0008] The low-temperature catalytic combustor comprises a heater and a catalytic combustion reaction chamber; the tube side inlet of the heater is connected with the PTA tail gas conveying device, the tube side outlet of the heater is connected with the inlet of the catalytic combustion reaction chamber, and the outlet of the catalytic combustion reaction chamber is connected with the shell side inlet of the heater; the PTA tail gas in the shell side of the heater entering the low-temperature catalytic combustor is heated by using the heat generated by the catalytic combustion reaction chamber as a heat source;

[0009] The shell side outlet of the heater, the air purification unit total air inlet control valve, the purifier heating air pipeline, the first heating air inlet valve, the tube side inlet of the first air purifier are sequentially connected; the tube side outlet of the first air purifier, the first heating air outlet valve, the condenser, the second air inlet valve, the shell side outlet of the second air purifier are sequentially connected; the shell side inlet of the second air purifier, the second air outlet valve, the purifier air outlet pipeline are sequentially connected; the purifier air outlet pipeline is sequentially connected with the PTA user interface and the polyester user interface.

[0010] The shell side outlet of the heater, the third regulating valve, the regenerated air inlet pipeline, the first regulating valve, the shell side inlet of the first air purifier are sequentially connected; the shell side outlet of the first air purifier, the first regenerated air outlet valve, the inlet of the washing tower are sequentially connected; the outlet of the washing tower is connected with the low-pressure user interface.

[0011] As a preferred technical scheme:

[0012] The PTA oxidation tail gas combustion purification system as described above, the tube side inlet of the heater is located above the tube side outlet, the shell side inlet is located below the shell side outlet, and the inlet of the catalytic combustion reaction chamber is located above the outlet.

[0013] The PTA oxidation tail gas combustion purification system as described above, the tube side inlet of the first air purifier is located above the tube side outlet, and the shell side inlet is located above the shell side outlet; the tube side inlet of the second air purifier is located above the tube side outlet, and the shell side inlet is located above the shell side outlet.

[0014] The PTA oxidation tail gas combustion purification system as described above, the first air purifier and the second air purifier are of the same structure; the first air purifier is composed of a filler and an upper air purifier head, a vertical tube and a lower air purifier head arranged in sequence from top to bottom; the hollow part of the vertical tube is the tube side of the first air purifier, and the gap between each vertical tube is the shell side of the first air purifier.

[0015] The PTA oxidation tail gas combustion purification system as described above further comprises a second heating gas inlet valve, a second heating gas outlet valve, a first inlet valve, a first outlet valve, a second regulating valve and a second regeneration exhaust valve;

[0016] The purification heater inlet pipeline, the second heating gas inlet valve and the tube passage inlet of the second air purifier are sequentially connected, the tube passage outlet of the second air purifier, the second heating gas outlet valve, the condenser, the first inlet valve and the shell passage outlet of the first air purifier are sequentially connected, and the shell passage inlet of the first air purifier, the first outlet valve and the purification outlet pipeline are sequentially connected;

[0017] The regeneration gas inlet pipeline, the second regulating valve and the shell passage inlet of the second air purifier are sequentially connected, and the shell passage outlet of the second air purifier, the second regeneration exhaust valve and the washing tower are sequentially connected.

[0018] The PTA oxidation tail gas combustion purification system as described above further comprises a booster valve and a third real-time monitor;

[0019] The first regulating valve and the second regulating valve are installed on the same pipeline, a position between the first regulating valve and the second regulating valve on the pipeline is recorded as position C, and position C is connected with the regeneration gas inlet pipeline;

[0020] The first outlet valve and the second outlet valve are installed on the same pipeline, a position between the first outlet valve and the second outlet valve on the pipeline is recorded as position D, and position D is connected with the purification outlet pipeline;

[0021] The booster valve is connected with position C and position D at the same time;

[0022] The third real-time monitor is installed on the purification outlet pipeline;

[0023] The third real-time monitor is electrically connected with the third regulating valve and the booster valve at the same time;

[0024] The third real-time monitor adjusts the valve opening degree of the third regulating valve by analyzing harmful substances in the tail gas and the dew point on line, so as to adjust the amount of gas entering the shell passage of the first air purifier and the second air purifier.

[0025] The PTA oxidation tail gas combustion purification system as described above further comprises a first real-time monitor, a second real-time monitor and a third pressure transmitter;

[0026] The first real-time monitor is installed on the first air purifier and is electrically connected with the first regulating valve;

[0027] The second real-time monitor is installed on the second air purifier and is electrically connected with the second regulating valve;

[0028] The third pressure transmitter is installed on the heating inlet pipeline of the purifier, and is electrically connected with the first real-time monitor, the second real-time monitor, the first regulating valve and the second regulating valve.

[0029] The first real-time monitor monitors the shell temperature and pressure of the first air purifier, adjusts the valve opening of the first regulating valve, and then adjusts the amount of gas entering the shell of the first air purifier.

[0030] The second real-time monitor monitors the shell temperature and pressure of the second air purifier, adjusts the valve opening of the second regulating valve, and then adjusts the amount of gas entering the shell of the second air purifier.

[0031] The PTA oxidation tail gas combustion purification system as described above further comprises a first pressure transmitter and a second pressure transmitter.

[0032] The first pressure transmitter is installed on the connecting pipeline between the tube outlet of the first air purifier and the first heating gas outlet valve.

[0033] The second pressure transmitter is installed on the connecting pipeline between the tube outlet of the second air purifier and the second heating gas outlet valve.

[0034] Beneficial effects:

[0035] (1) The low-temperature catalytic combustor is used to combust the harmful substances such as residual acetic acid in the PTA oxidation tail gas, so as to recover the heat, and the air purifier is used to reduce the harmful and corrosive substances in the tail gas, so that the treated tail gas can be used to replace nitrogen, which is used in the polyester device in the downstream industry chain, so as to protect the downstream device pipeline from corrosion, reduce the purchase of nitrogen in the downstream device, and realize the integration of the PTA to the polyester industry chain, the sharing of the tail gas, the reduction of the purchase cost and the increase of the system stability.

[0036] (2) The air purifier with the sleeve structure is selected, and the tail gas passes through the tube of the air purifier, so that the regeneration of the air purifier can be realized without additional energy, the heat of the PTA oxidation tail gas is fully utilized, and the traditional equipment is more environmentally friendly and more energy-saving. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is a schematic diagram of the PTA oxidation tail gas combustion purification system of the present application;

[0038] Figure 2 It is a schematic diagram of the low-temperature catalytic combustor of the present application;

[0039] Figure 3 And Figure 4This is a schematic diagram of the air purifier of the present invention;

[0040] Among them, 1-low temperature catalytic burner, 101-heater, 102-catalytic combustion reaction chamber, 2-purifier heating air inlet pipe, 31-first air purifier, 32-second air purifier, 301-filling material, 302-vertical tube, 303-upper air purifier end cap, 4-purifier air outlet pipe, 5-condenser, 6-scrubber, 7-air purification unit main air inlet control valve, 801-third real-time monitor, 802-third regulating valve, 803-pressure booster valve, 9011-first real-time monitor, 9012 - Second real-time monitor, 9021- First regulating valve, 9022- Second regulating valve, 11- Regeneration gas inlet pipe, 12- First outlet valve, 13- Second outlet valve, 14- First heating gas outlet valve, 15- Second heating gas outlet valve, 16- First inlet valve, 17- Second inlet valve, 18- First regeneration exhaust valve, 19- Second regeneration exhaust valve, 20- First heating gas inlet valve, 21- Second heating gas inlet valve, 22- First pressure transmitter, 23- Second pressure transmitter, 24- Third pressure transmitter. Detailed Implementation

[0041] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0042] A PTA oxidation exhaust gas combustion purification system, such as Figure 1 As shown, the system includes a low-temperature catalytic burner 1, a PTA tail gas delivery device, a main air intake control valve 7 for the air purification unit, a purifier heating air intake pipe 2, a first heating gas intake valve 20, a first air purifier 31, a first heating gas outlet valve 14, a condenser 5, a second intake valve 17, a second air purifier 32, a second outlet valve 13, a purifier outlet pipe 4, a PTA user interface, a polyester user interface, a third regulating valve 802, a regeneration gas intake pipe 11, a first regulating valve 9021, a first regeneration exhaust valve 18, a scrubbing tower 6, a low-pressure user interface, a second heating gas intake valve 21, a second heating gas outlet valve 15, a first intake valve 16, a first outlet valve 12, a second regulating valve 9022, a second regeneration exhaust valve 19, a pressure boosting valve 803, a third real-time monitor 801, a first real-time monitor 9011, a second real-time monitor 9012, a third pressure transmitter 24, a first pressure transmitter 22, and a second pressure transmitter 23.

[0043] like Figure 2As shown, the low-temperature catalytic combustor 1 comprises a heater 101 and a catalytic combustion reaction chamber 102;

[0044] The heater 101 is in a double-pipe structure, located above the catalytic combustion reaction chamber 102, with the tube passage inlet above the tube passage outlet and the shell passage inlet below the shell passage outlet; the inlet of the catalytic combustion reaction chamber 102 is above the outlet;

[0045] The tube passage inlet of the heater 101 is connected with the PTA tail gas conveying device, the tube passage outlet of the heater 101 is connected with the inlet of the catalytic combustion reaction chamber 102, and the outlet of the catalytic combustion reaction chamber 102 is connected with the shell passage inlet of the heater 101;

[0046] As shown in Figure 3 and Figure 4 The first air purifier 31 is in a double-pipe structure, composed of a filler 301 and an upper air purifier head 303, a vertical tube column 302 and a lower air purifier head arranged in sequence from top to bottom, the hollow part of the vertical tube column 302 being the tube passage of the first air purifier 31, with the tube passage inlet above the tube passage outlet, and the gap between each vertical tube column 302 being the shell passage of the first air purifier 31, with the shell passage inlet above the shell passage outlet;

[0047] The second air purifier 32 and the first air purifier 31 have the same structure and are both filled with the filler 301 which is an adsorbent or a desiccant;

[0048] The shell passage outlet of the heater 101, the air purification unit total gas inlet control valve 7, the purifier heating gas inlet pipeline 2, the first heating gas inlet valve 20, the tube passage inlet of the first air purifier 31 are sequentially connected, the tube passage outlet of the first air purifier 31, the first heating gas outlet valve 14, the condenser 5, the second gas inlet valve 17, the shell passage outlet of the second air purifier 32 are sequentially connected; the shell passage inlet of the second air purifier 32, the second gas outlet valve 13, the purifier gas outlet pipeline 4 are sequentially connected, and the purifier gas outlet pipeline 4 is sequentially connected with the PTA user interface and the polyester user interface;

[0049] The shell passage outlet of the heater 101, the third regulating valve 802, the regenerative gas inlet pipeline 11, the first regulating valve 9021, the shell passage inlet of the first air purifier 31 are sequentially connected, the shell passage outlet of the first air purifier 31, the first regenerative gas outlet valve 18, the inlet of the scrubbing tower 6 are sequentially connected, and the outlet of the scrubbing tower 6 is connected with the low-pressure user interface.

[0050] The purifier heating air inlet pipe 2, the second heating air inlet valve 21, and the tube passage inlet of the second air purifier 32 are sequentially connected; the tube passage outlet of the second air purifier 32, the second heating air outlet valve 15, the condenser 5, the first air inlet valve 16, and the shell passage outlet of the first air purifier 31 are sequentially connected; the shell passage inlet of the first air purifier 31, the first air outlet valve 12, and the purifier air outlet pipe 4 are sequentially connected;

[0051] The regenerative air inlet pipe 11, the second adjusting valve 9022, and the shell passage inlet of the second air purifier 32 are sequentially connected; the shell passage outlet of the second air purifier 32, the second regenerative air outlet valve 19, and the washing tower 6 are sequentially connected;

[0052] The first adjusting valve 9021 and the second adjusting valve 9022 are installed on the same pipe, and the position between the first adjusting valve 9021 and the second adjusting valve 9022 on the pipe is recorded as position C, and the position C is connected with the regenerative air inlet pipe 11;

[0053] The first air outlet valve 12 and the second air outlet valve 13 are installed on the same pipe, and the position between the first air outlet valve 12 and the second air outlet valve 13 on the pipe is recorded as position D, and the position D is connected with the purifier air outlet pipe 4;

[0054] The pressure boosting valve 803 is connected with the position C and the position D at the same time;

[0055] The third real-time monitor 801 is installed on the purifier air outlet pipe 4;

[0056] The third real-time monitor 801 is electrically connected with the third adjusting valve 802 and the pressure boosting valve 803 at the same time;

[0057] The first real-time monitor 9011 is installed on the first air purifier 31 and is electrically connected with the first adjusting valve 9021;

[0058] The second real-time monitor 9012 is installed on the second air purifier 32 and is electrically connected with the second adjusting valve 9022;

[0059] The third pressure transmitter 24 is installed on the purifier heating air inlet pipe 2, and the third pressure transmitter 24 is electrically connected with the first real-time monitor 9011, the second real-time monitor 9012, the first adjusting valve 9021, and the second adjusting valve 9022 at the same time;

[0060] The first pressure transmitter 22 is installed on the connecting pipeline between the tube passage outlet of the first air purifier 31 and the first heating air outlet valve 14;

[0061] The second pressure transmitter 23 is installed on the connecting pipeline between the tube passage outlet of the second air purifier 32 and the second heating air outlet valve 15.

[0062] The specific use process of the PTA oxidation tail gas combustion purification system is as follows: the PTA oxidation tail gas is added into the heater through the PTA tail gas conveying device, and then is subjected to catalytic combustion in the catalytic combustion reaction chamber, the temperature of the tail gas after combustion is increased, the combusted gas discharged from the catalytic combustion reaction chamber enters the shell side of the heater through the shell side inlet of the heater, and then is discharged from the shell side outlet and enters the air purifier;

[0063] Taking the first air purifier 31 regeneration and the second air purifier 32 adsorption as an example, only the air purification unit total air inlet control valve 7, the first heating gas air inlet valve 20, the first heating gas air outlet valve 14, the second air inlet valve 17, the second air outlet valve 13, the third regulating valve 802, the first regulating valve 9021 and the first regeneration air outlet valve 18 are opened, and other valves are closed, the gas from the heater 101 enters the purifier heating air inlet pipeline 2 through the air purification unit total air inlet control valve 7; the gas enters the first air purifier 31 through the first heating gas air inlet valve 20, enters the vertical column pipe 302 through the upper air purifier head 303, and the heat in the gas is transferred to the adsorbent / desiccant through the column pipe heat exchange; then the gas enters the condenser 5 through the opened first heating gas air outlet valve 14; the gas after condensation in the condenser 5 enters the second air purifier 32 through the opened second air inlet valve 17; the gas enters the shell side of the second air purifier 32 and contacts with the adsorbent / desiccant 301, the harmful substances and water are adsorbed, and the gas is purified, and the purified gas enters the purifier air outlet pipeline 4 through the opened second air outlet valve 13 for PTA and polyester users;

[0064] At the same time, the gas discharged from the shell side of the heater 101 enters the regeneration gas air inlet pipeline 11 through the third regulating valve 802, enters the shell side of the first air purifier 31 and contacts with the adsorbent / desiccant 301 through the first regulating valve 9021; then the regeneration gas, harmful substances and water discharged from the shell side of the first air purifier 31 enter the scrubber 6 again through the first regeneration air outlet valve 18; the gas after washing in the scrubber 6 is used by low-pressure users;

[0065] The third real-time monitor adjusts the valve opening degree of the third regulating valve and then adjusts the amount of gas entering the shell side of the first air purifier according to the harmful substances and dew point in the tail gas; if the harmful substances and dew point in the tail gas are poor, the valve opening degree of the third regulating valve is adjusted to be larger; otherwise, the valve opening degree of the third regulating valve is adjusted to be smaller.

[0066] The first real-time monitor adjusts the valve opening degree of the first regulating valve and then adjusts the amount of gas entering the shell side of the first air purifier according to the temperature and pressure of the shell side of the first air purifier.

[0067] The dew point of the finally treated tail gas is -30℃ to -40℃, the oxygen content is less than 4% v / v, and the non-methane total hydrocarbon is less than 100 mg / m 3.

[0068] Take the first air purifier 31 adsorption, the second air purifier 32 regeneration as an example, only open air purification unit total air control valve 7, second heating gas inlet valve 21, second heating gas outlet valve 15, first inlet valve 16, first outlet valve 12, third regulating valve 802, second regulating valve 9022, second regeneration exhaust valve 19, close other valves, gas from the heater 101 through the air purification unit total air control valve 7 into the purifier heating inlet pipe 2; gas through the second heating gas inlet valve 21 into the second air purifier 32, through the upper air purifier head 303 into the vertical column tube 302, the heat in the gas is given to the adsorbent / desiccant through the column heat exchanger; then the gas from the open second heating gas outlet valve 15, into the condenser 5; from the condenser 5 after condensation of the gas from the open first inlet valve 16 into the first air purifier 31; the gas into the first air purifier 31 shell side with the adsorbent / desiccant 301 contact, harmful substances and water are adsorbed, the gas is purified, the purified gas through the open first outlet valve 12 into the purifier outlet pipe 4, for PTA and polyester user;

[0069] At the same time, the gas from the heater 101 shell side exhaust through the third regulating valve 802 into the regeneration gas inlet pipe 11, through the second regulating valve 9022 into the shell side of the second air purifier 32 with the adsorbent / desiccant 301 contact, the first regulating valve 9021 at this time is in the closed state; then the regeneration gas from the shell side of the second air purifier 32 has harmful substances and water again through the second regeneration exhaust valve 19 into the scrubber 6, the second inlet valve 17 and the first regeneration exhaust valve 18 at this time are in the closed state; the gas through the scrubber 6 for low pressure user after washing;

[0070] The third real-time monitor adjusts the valve opening of the third regulating valve by analyzing the harmful substances in the tail gas and the dew point, and then adjusts the amount of gas entering the shell side of the second air purifier; if the harmful substances in the tail gas and the dew point are poor, the valve opening of the third regulating valve is adjusted; otherwise, the valve opening of the third regulating valve is adjusted.

[0071] The second real-time monitor monitors the shell side temperature and pressure of the second air purifier, adjusts the valve opening of the second regulating valve, and then adjusts the amount of gas entering the shell side of the second air purifier.

[0072] The dew point of the tail gas after final treatment is-30℃ to-40℃, the oxygen content is less than 4% v / v, and the non-methane total hydrocarbon is less than 100 mg / m 3 .

[0073] Take the first air purifier 31 adsorption, the second air purifier 32 adsorption as an example, open the third regulating valve 802, the first regulating valve 9021, the second regulating valve 9022, the boost valve 803, boost, to the first real-time monitor 9011, the second real-time monitor 9012 The value is equal, close the boost valve 803, open the first regeneration exhaust valve 18, the second regeneration exhaust valve 19.

[0074] The dew point of the final treated tail gas is -30℃ to -40℃, the oxygen content is <4% v / v, and the non-methane total hydrocarbon is <100 mg / m 3 .

[0075] The functions of each component in the embodiment are as follows:

[0076] PTA tail gas conveying device: sends PTA tail gas into the heater of the low-temperature catalytic combustor;

[0077] Low-temperature catalytic combustor: heats and catalytically combusts PTA tail gas;

[0078] Air purification unit total gas inlet control valve: controls whether the gas from the heater is allowed to enter the purifier heating gas inlet pipeline;

[0079] Purifier heating gas inlet pipeline: conveys the gas from the heater;

[0080] First heating gas inlet valve and second heating gas inlet valve: control whether the gas from the purifier heating gas inlet pipeline is allowed to enter the air purifier;

[0081] First air purifier and second air purifier: purify the gas passing through the purifier heating gas inlet pipeline;

[0082] First heating gas outlet valve and second heating gas outlet valve: convey the gas purified by the purifier to the condenser;

[0083] Condenser: cools the gas purified by the purifier;

[0084] Second gas inlet valve and first gas inlet valve: control the regeneration of the gas passing through the purifier into the next purifier;

[0085] First gas outlet valve and second gas outlet valve: control whether the treated tail gas is allowed to enter the purifier gas outlet pipeline;

[0086] Purifier gas outlet pipeline: supplies the purified tail gas to the user;

[0087] Third regulating valve: conveys the gas into the regeneration gas inlet pipeline;

[0088] Regeneration gas inlet pipeline: conveys the gas from the heater;

[0089] First regulating valve and second regulating valve: control gas from regenerative gas inlet pipeline;

[0090] First regenerative exhaust valve and second regenerative exhaust valve: control purified gas to washing tower;

[0091] Washing tower: internally provided with filler, distribution disc, circulating washing pump and spraying member, for circulating washing of harmful substances in exhaust gas, and discharging washed waste liquid by circulating washing pump;

[0092] Low-pressure user interface: deliver gas after washing by washing tower for user to use;

[0093] First pressure transmitter, second pressure transmitter and third pressure transmitter: realize accurate measurement and control of gas pressure;

[0094] First real-time monitor and second real-time monitor: monitor first air purifier and second air purifier;

[0095] Third real-time monitor: monitor third regulating valve and pressure increasing valve;

[0096] Heater: heat PTA exhaust gas by using waste heat generated by catalytic combustion;

[0097] Filler: adsorb harmful substances in gas, and dry gas;

[0098] Catalytic combustion reaction chamber: catalytic combustion of heated gas;

[0099] Air purifier head: deliver gas to vertical tube;

[0100] Vertical tube: exchange heat of gas to filler;

[0101] Pressure increasing valve: realize pressure increasing of first air purifier and second air purifier.

[0102] Finally, it should be noted that the above only for the preferred examples of the present application, and not for limiting the present application, although the foregoing examples of the present application are described in detail, for those skilled in the art, it still can be modified, or part of the technical features of the equivalent replacement. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included in the scope of protection of the present application.

Claims

1. A PTA oxidation tail gas combustion purification system, characterized in that, Includes a low-temperature catalytic burner (1), a PTA tail gas delivery device, an air purification unit main intake control valve (7), a purifier heating intake pipe (2), a first heating gas intake valve (20), a first air purifier (31), a first heating gas outlet valve (14), a condenser (5), a second intake valve (17), a second air purifier (32), a second outlet valve (13), a purifier outlet pipe (4), a PTA user interface, a polyester user interface, a third regulating valve (802), a regeneration gas intake pipe (11), a first regulating valve (9021), a first regeneration exhaust valve (18), a scrubbing tower (6), and a low-pressure user interface; The heater (101), the first air purifier (31) and the second air purifier (32) are all sleeve-type structures; the shell side of the first air purifier (31) and the second air purifier (32) are filled with filler (301), which is an adsorbent or a desiccant. The low-temperature catalytic burner (1) includes a heater (101) and a catalytic combustion reaction chamber (102); the tube side inlet of the heater (101) is connected to the PTA tail gas conveying device, the tube side outlet of the heater (101) is connected to the inlet of the catalytic combustion reaction chamber (102), and the outlet of the catalytic combustion reaction chamber (102) is connected to the shell side inlet of the heater (101). The shell-side outlet of the heater (101), the main air intake control valve (7) of the air purification unit, the air intake pipe (2) of the purifier, the first heating gas intake valve (20), and the tube-side inlet of the first air purifier (31) are connected in sequence. The tube-side outlet of the first air purifier (31), the first heating gas outlet valve (14), the condenser (5), and the second intake valve (17) are connected in sequence. The shell side outlet of the second air purifier (32) is connected in sequence, the shell side inlet of the second air purifier (32), the second air outlet valve (13), and the air outlet pipe (4) of the purifier are connected in sequence, and the air outlet pipe (4) of the purifier is connected to the PTA user interface and the polyester user interface in sequence. The shell-side outlet of heater (101), third regulating valve (802), regeneration gas inlet pipe (11), first regulating valve (9021), and shell-side inlet of first air purifier (31) are connected in sequence. The shell-side outlet of first air purifier (31), first regeneration exhaust valve (18), and inlet of scrubbing tower (6) are connected in sequence. The outlet of scrubbing tower (6) is connected to low-pressure user interface.

2. The PTA oxidation tail gas combustion purification system according to claim 1, characterized in that, The heater (101) is located above the catalytic combustion reaction chamber (102); the tube-side inlet of the heater (101) is located above the tube-side outlet, the shell-side inlet is located below the shell-side outlet, and the inlet of the catalytic combustion reaction chamber (102) is located above the outlet.

3. The PTA oxidation tail gas combustion purification system according to claim 1, characterized in that, The first air purifier (31) has its tube inlet located above its tube outlet and its shell inlet located above its shell outlet; the second air purifier (32) has its tube inlet located above its tube outlet and its shell inlet located above its shell outlet.

4. The PTA oxidation tail gas combustion purification system according to claim 1, characterized in that, The first air purifier (31) and the second air purifier (32) have the same structure. The first air purifier (31) consists of a filler (301) and an upper air purifier end cap (303), a vertical tube (302) and a lower air purifier end cap arranged from top to bottom. The hollow part of the vertical tube (302) is the tube side of the first air purifier (31), and the gap between each vertical tube (302) is the shell side of the first air purifier (31).

5. The PTA oxidation tail gas combustion purification system according to claim 1, characterized in that, It also includes a second heating gas inlet valve (21), a second heating gas outlet valve (15), a first inlet valve (16), a first outlet valve (12), a second regulating valve (9022), and a second regeneration exhaust valve (19); The air purifier heating inlet pipe (2), the second heating gas inlet valve (21), and the tube side inlet of the second air purifier (32) are connected in sequence. The tube side outlet of the second air purifier (32), the second heating gas outlet valve (15), the condenser (5), the first inlet valve (16), and the shell side outlet of the first air purifier (31) are connected in sequence. The shell side inlet of the first air purifier (31), the first outlet valve (12), and the air purifier outlet pipe (4) are connected in sequence. The regenerated gas inlet pipe (11), the second regulating valve (9022), and the shell-side inlet of the second air purifier (32) are connected in sequence, and the shell-side outlet of the second air purifier (32), the second regenerated exhaust valve (19), and the scrubbing tower (6) are connected in sequence.

6. The PTA oxidation tail gas combustion purification system according to claim 5, characterized in that, It also includes a pressure boosting valve (803) and a third real-time monitor (801); The first regulating valve (9021) and the second regulating valve (9022) are installed on the same pipe. The position on the pipe between the first regulating valve (9021) and the second regulating valve (9022) is denoted as position C. Position C is connected to the regeneration gas inlet pipe (11). The first air outlet valve (12) and the second air outlet valve (13) are installed on the same pipe. The position on the pipe between the first air outlet valve (12) and the second air outlet valve (13) is denoted as position D. Position D is connected to the air outlet pipe (4) of the purifier. The pressure boosting valve (803) is connected to both position C and position D. The third real-time monitor (801) is installed on the air outlet pipe (4) of the purifier; The third real-time monitor (801) is electrically connected to both the third regulating valve (802) and the boosting valve (803).

7. The PTA oxidation tail gas combustion purification system according to claim 5, characterized in that, It also includes a first real-time monitor (9011), a second real-time monitor (9012), and a third pressure transmitter (24); The first real-time monitor (9011) is installed on the first air purifier (31) and is electrically connected to the first regulating valve (9021); The second real-time monitor (9012) is installed on the second air purifier (32) and is electrically connected to the second regulating valve (9022); The third pressure transmitter (24) is installed on the air intake pipe (2) of the purifier. The third pressure transmitter (24) is also electrically connected to the first real-time monitor (9011), the second real-time monitor (9012), the first regulating valve (9021), and the second regulating valve (9022).

8. The PTA oxidation tail gas combustion purification system according to claim 5, characterized in that, It also includes a first pressure transmitter (22) and a second pressure transmitter (23); The first pressure transmitter (22) is installed on the connecting pipe between the tube outlet of the first air purifier (31) and the first heating gas outlet valve (14); The second pressure transmitter (23) is installed on the connecting pipe between the outlet of the second air purifier (32) and the second heating gas outlet valve (15).

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