Automatic spraying device for PTA tail gas condensate recovery

Abstract

The utility model relates to an automatic spraying device for recycling PTA (pure terephthalic acid) tail gas condensate, which comprises a dryer chimney, a dryer tail gas washing tank, a tail gas cooler, a condensate collecting tank, a washing tank condensate spraying pipe and a No.1 nozzle. The spray water is used as tail gas spray water and inclined tube spray water, tail gas condensate is fully utilized, water consumption of the device is reduced, and meanwhile sewage discharge of the device is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of polyester fiber production, in particular to a PTA tail gas condensate recovery self-spraying device. Background Art

[0002] At present, the PTA device uses a dryer to dry its filter cake. The dried water and a small amount of PTA powder enter the dryer tail gas washing tank through the chimney along with the dehumidified gas. In order to reduce the PTA powder entering the tail gas treatment system, it will be washed by spraying. The PTA powder will be discharged into the tail gas treatment system after washing. The spray water used is deionized water, and the water in the tail gas will be discharged into the sewage treatment system after cooling, which increases the water consumption of the device and greatly increases the sewage load. Utility Model Content

[0003] In order to solve the above technical deficiencies, the utility model provides a PTA tail gas condensate recovery automatic spraying device, which reduces the deionized water consumption of the device and reduces the sewage treatment load.

[0004] The utility model discloses an automatic spraying device for recovering condensate from PTA tail gas, comprising a dryer chimney, a No. 1 inclined pipe is arranged on one side of the dryer chimney, a dryer tail gas washing tank is arranged at the lower end of the No. 1 inclined pipe, a washing water collecting pipe is arranged at the lower side of the dryer tail gas washing tank, and a washing water lifting pump is arranged on the washing water collecting pipe; a tail gas main pipe is arranged on the upper side of the dryer tail gas washing tank, one end of the tail gas main pipe is connected to a tail gas cooler, a gas phase vent pipe is arranged on one side of the tail gas cooler, and the gas phase vent pipe is connected to a tail gas treatment system; a condensate collecting pipe is arranged on the lower side of the tail gas cooler, and a condensate collecting tank is arranged at one end of the condensate collecting pipe. A condensate outlet main pipe is provided at the lower side of the condensate collecting tank, a condensate lifting pump is provided on the condensate outlet main pipe, a washing tank condensate spray pipe is provided at the condensate outlet main pipe downstream of the condensate lifting pump, one end of the washing tank condensate spray pipe extends to the interior of the dryer exhaust gas washing tank and is provided with a No. 1 nozzle; a deionized water spray pipe is provided on the washing tank condensate spray pipe; a No. 1 inclined tube spray pipe is provided on the condensate outlet main pipe, one end of the No. 1 inclined tube spray pipe extends to the interior of the No. 1 inclined tube and is provided with a No. 1 inclined tube spray nozzle; a filter filler spray pipe is provided on the condensate outlet main pipe, and excess condensate can be used for filter filler spraying to increase the utilization rate of condensate.

[0005] Furthermore, an overflow pipe is provided on one side of the condensate collection tank, and a wastewater buffer tank is provided at one end of the overflow pipe.

[0006] Furthermore, the condensate outlet main pipe downstream of the condensate lift pump is provided with a No. 1 filter and a No. 1 valve; the condensate outlet main pipe is provided with a No. 2 filter and a No. 2 valve, and the pipeline where the No. 1 filter and the No. 1 valve are located is connected in parallel with the pipeline where the No. 2 filter and the No. 2 valve are located.

[0007] Furthermore, a secondary dryer chimney is provided, a No. 2 inclined pipe is provided on one side of the secondary dryer chimney, a secondary dryer exhaust gas washing tank is provided on the lower side of the No. 2 inclined pipe, the upper side of the secondary dryer exhaust gas washing tank is connected to the exhaust gas main pipe, a secondary washing water collecting pipe is provided on the lower side of the secondary dryer exhaust gas washing tank, a secondary washing water lifting pump is provided on the secondary washing water collecting pipe, a secondary washing tank condensate spray pipe is provided on the condensate outlet main pipe downstream of the condensate lifting pump, one end of the secondary washing tank condensate spray pipe extends to the inside of the secondary dryer exhaust gas washing tank and is provided with a No. 2 nozzle; the secondary washing tank condensate spray pipe is provided with a secondary deionized water spray pipe; the condensate outlet main pipe is provided with a No. 2 inclined pipe spray pipe, one end of the No. 2 inclined pipe spray pipe extends to the inside of the No. 2 inclined pipe and is provided with a No. 2 inclined pipe spray nozzle.

[0008] Furthermore, the condensate collection tank and the condensate outlet main pipe are both provided with emergency water supply pipes.

[0009] The utility model provides an automatic spraying device for recovering condensate from PTA tail gas, which is used for cooling and recovering water in the tail gas of a dryer, and is used as tail gas spraying water and inclined tube spraying water, and can also be used as filter filler cooling spraying water. The purpose is to recover and reuse the water in the tail gas during normal operation of the device, so that the condensate of the PTA device is efficiently utilized, the deionized water consumption of the device is reduced, and the sewage treatment load is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0011] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0012] Embodiment 1:

[0013] like Figure 1As shown, the utility model discloses an automatic spraying device for recovering condensate from PTA tail gas, comprising a dryer chimney 1. The tail gas of the PTA device is output to the outside through the dryer chimney 1 after passing through the dryer. A No. 1 inclined pipe 2 is provided on one side of the dryer chimney 1. A dryer tail gas washing tank 3 is provided at the lower end of the No. 1 inclined pipe 2. A washing water collecting pipe 20 is provided on the lower side of the dryer tail gas washing tank 3. A washing water lifting pump 21 is provided on the washing water collecting pipe 20 to pressurize the washing water in the washing water collecting pipe 20 and transport it to the outside. A tail gas main pipe 4 is provided on the upper side of the dryer tail gas washing tank 3. One end of the tail gas main pipe 4 is connected to a tail gas cooler 5 to cool the tail gas and separate the moisture in the tail gas. A gas phase vent is provided on one side of the tail gas cooler 5. Pipe 6, the gas phase vent pipe 6 transports the exhaust gas into the exhaust gas treatment system; the lower side of the exhaust gas cooler 5 is provided with a condensate collecting pipe 7, one end of the condensate collecting pipe 7 is provided with a condensate collecting tank 8, the lower side of the condensate collecting tank 8 is provided with a condensate outlet main pipe 11, the condensate outlet main pipe 11 is provided with a condensate lifting pump 12, the condensate in the condensate outlet main pipe 11 is pressurized, the condensate outlet main pipe 11 downstream of the condensate lifting pump 12 is provided with a washing tank condensate spray pipe 17, one end of the washing tank condensate spray pipe 17 extends to the inside of the dryer exhaust gas washing tank 3 and is provided with a No. 1 nozzle 19; the washing tank condensate spray pipe 17 is provided with a deionized water spray pipe 18; the condensate outlet main pipe 11 is provided with a No. 1 inclined pipe spray pipe 24, the No. 1 One end of the inclined tube spray pipe 24 extends to the interior of the No. 1 inclined tube 2 and is provided with a No. 1 inclined tube spray nozzle 25; the condensate outlet main pipe 11 is provided with a filter filler spray pipe 22; the exhaust gas enters the dryer exhaust gas washing tank 3 from the dryer chimney 1 through the No. 1 inclined tube 2; the deionized water enters from the deionized water spray pipe 18 and is sprayed from the No. 1 nozzle 19 to wash the exhaust gas in the dryer exhaust gas washing tank 3, washing the PTA dust in the exhaust gas, and the washing water flows into the washing water collecting pipe 20 due to gravity, and is pressurized by the washing water lifting pump 21 as the filter washing water, so that the washing water is used twice, saving water; the washed exhaust gas enters the exhaust gas cooler 5 from the exhaust gas main pipe 4, and the exhaust gas cooler 5 condenses the washing water carried in the exhaust gas, Gas-liquid separation is now performed, and the separated gas enters the tail gas treatment system from the gas phase vent pipe 6, and the separated condensate enters the condensate collecting tank 8 from the condensate collecting pipe 7. The condensate in the condensate collecting tank 8 enters the condensate outlet main pipe 11 for distribution after being pressurized by the condensate lifting pump 12. A part of the condensate enters the condensate spray pipe 17 of the washing tank and is mixed with deionized water, and then sprayed on the tail gas through the No. 1 nozzle 19, which reduces the consumption of deionized water and saves costs; a part of the condensate in the condensate outlet main pipe 11 enters the No. 1 inclined tube spray pipe 24 and washes the PTA dust accumulated in the No. 1 inclined tube 2 through the No. 1 inclined tube spray nozzle 25. The washing water flows into the dryer tail gas washing tank 3 along the No. 1 inclined tube 2 due to gravity, preventing the PTA dust from accumulating and blocking the No. 1 inclined tube 2;A portion of the condensate in the condensate outlet main pipe 11 enters the filter packing spray pipe 22 to cool and lubricate the filter packing to prevent the filter from heating and wearing the packing due to long-term operation of the filter.

[0014] An overflow pipe 9 is provided on one side of the condensate collecting tank 8, and a wastewater buffer tank 10 is provided at one end of the overflow pipe 9. When the condensate in the condensate collecting tank 8 is higher than the overflow pipe 9, the condensate enters the wastewater buffer tank 10 through the overflow pipe 9 to ensure that the condensate can be discharged normally when there is a fault downstream of the condensate collecting tank 8.

[0015] A filter No. 13 and a valve No. 14 are provided on the condensate outlet main pipe 11 downstream of the condensate lifting pump 12; a filter No. 2 15 and a valve No. 2 16 are also provided on the condensate outlet main pipe 11. The pipeline where the filter No. 13 and the valve No. 1 14 are located is connected in parallel with the pipeline where the filter No. 2 15 and the valve No. 2 16 are located, so as to filter the suspended particles in the condensate and ensure the smooth flow of the pipeline. At the same time, when the filter No. 1 13 fails, the valve No. 1 14 is closed and the valve No. 2 16 is opened to switch to the filter No. 2 15, so as to ensure that the device will not stop operating when the filter fails to be repaired, thereby improving production efficiency.

[0016] In order to improve the efficiency of exhaust gas treatment, an auxiliary dryer chimney 31 is provided, and a No. 2 inclined pipe 30 is provided on one side of the auxiliary dryer chimney 31, and an auxiliary dryer exhaust gas washing tank 29 is provided on the lower side of the No. 2 inclined pipe 30. The upper side of the auxiliary dryer exhaust gas washing tank 29 is connected to the exhaust gas main pipe 4, and an auxiliary washing water collecting pipe 34 is provided on the lower side of the auxiliary dryer exhaust gas washing tank 29. A secondary washing water lifting pump 35 is provided on the auxiliary washing water collecting pipe 34, and an auxiliary washing tank condensate spray pipe 26 is provided on the condensate outlet main pipe 11 downstream of the condensate lifting pump 12. One end of the auxiliary washing tank condensate spray pipe 26 extends to the inside of the auxiliary dryer exhaust gas washing tank 29 and is provided with a No. 2 nozzle 28; the auxiliary washing tank condensate spray pipe 26 is provided with an auxiliary deionized water spray pipe 27; the condensate outlet main pipe 11 is provided with a No. 2 inclined pipe spray pipe 32, and the No. 2 inclined pipe One end of the spray pipe 32 extends to the interior of the No. 2 inclined tube 30 and is provided with a No. 2 inclined tube spray nozzle 33; the exhaust gas in the auxiliary dryer chimney 31 enters the auxiliary dryer exhaust gas washing tank 29 through the No. 2 inclined tube 30, and the mixed liquid of the condensate in the auxiliary washing tank condensate spray pipe 26 and the deionized water in the auxiliary deionized water spray pipe 27 washes the exhaust gas in the auxiliary dryer exhaust gas washing tank 29 through the No. 2 nozzle 28, and the washed exhaust gas enters the exhaust main pipe 4; the washing water enters the auxiliary washing water collecting pipe 34 and is pressurized by the auxiliary washing water lifting pump 35 to be used as filter washing water; the condensate in the No. 2 inclined tube spray pipe 32 washes the PTA dust accumulated in the No. 2 inclined tube 30 through the No. 2 inclined tube nozzle. When one set of equipment fails, the other set operates normally, and the failed equipment can be repaired without stopping the operation, thereby ensuring production efficiency.

[0017] In order to prevent the situation where the condensate circulating in the device is insufficient, the condensate collection tank 8 and the condensate outlet main pipe 11 are both provided with an emergency water supply pipe 23 .

[0018] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0019] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be an interactive relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0020] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0021] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simplified modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A PTA tail gas condensate recovery automatic spraying device, characterized in that: The invention comprises a dryer chimney (1), wherein a No. 1 inclined pipe (2) is provided on one side of the dryer chimney (1), a dryer tail gas washing tank (3) is provided at the lower end of the No. 1 inclined pipe (2), a washing water collecting pipe (20) is provided on the lower side of the dryer tail gas washing tank (3), and a washing water lifting pump (21) is provided on the washing water collecting pipe (20); an tail gas main pipe (4) is provided on the upper side of the dryer tail gas washing tank (3), one end of the tail gas main pipe (4) is connected to a tail gas cooler (5), and a gas phase vent pipe (6) is provided on one side of the tail gas cooler (5); a condensate collecting pipe (7) is provided on the lower side of the tail gas cooler (5), and a condensate collecting tank (8) is provided at one end of the condensate collecting pipe (7), A condensate outlet main pipe (11) is provided at the lower side of the condensate collecting tank (8), a condensate lifting pump (12) is provided on the condensate outlet main pipe (11), a washing tank condensate spray pipe (17) is provided on the condensate outlet main pipe (11) downstream of the condensate lifting pump (12), one end of the washing tank condensate spray pipe (17) extends to the interior of the dryer exhaust gas washing tank (3) and is provided with a No. 1 spray head (19); the washing tank condensate spray pipe (17) is provided with a deionized water spray pipe (18); and a No. 1 inclined tube spray pipe (24) is provided on the condensate outlet main pipe (11), one end of the No. 1 inclined tube spray pipe (24) extends to the interior of the No. 1 inclined tube (2) and is provided with a No. 1 inclined tube spray head (25).

2. The automatic spraying device for recovering condensate from PTA tail gas according to claim 1, characterized in that: An overflow pipe (9) is provided on one side of the condensate collection tank (8), and a wastewater buffer tank (10) is provided on one end of the overflow pipe (9).

3. The automatic spraying device for recovering condensate from PTA tail gas according to claim 1, characterized in that: A No. 1 filter (13) and a No. 1 valve (14) are provided on the condensate outlet main pipe (11) downstream of the condensate lift pump (12); a No. 2 filter (15) and a No. 2 valve (16) are provided on the condensate outlet main pipe (11), and the No. 1 filter (13) and the No. 1 valve (14) are connected in parallel with the No. 2 filter (15) and the No. 2 valve (16).

4. The automatic spraying device for recovering condensate from PTA tail gas according to claim 1, characterized in that: A secondary dryer chimney (31) is provided, a No. 2 inclined pipe (30) is provided on one side of the secondary dryer chimney (31), a secondary dryer tail gas washing tank (29) is provided on the lower side of the No. 2 inclined pipe (30), the upper side of the secondary dryer tail gas washing tank (29) is connected to the tail gas main pipe (4), a secondary washing water collecting pipe (34) is provided on the lower side of the secondary dryer tail gas washing tank (29), a secondary washing water lifting pump (35) is provided on the secondary washing water collecting pipe (34), and the condensate outlet downstream of the condensate lifting pump (12) is connected to the tail gas main pipe (4). The pipe (11) is provided with a secondary washing tank condensate spray pipe (26), one end of which extends to the interior of the secondary dryer exhaust gas washing tank (29) and is provided with a No. 2 spray head (28); the secondary washing tank condensate spray pipe (26) is provided with a secondary deionized water spray pipe (27); the condensate outlet main pipe (11) is provided with a No. 2 inclined tube spray pipe (32), one end of which extends to the interior of the No. 2 inclined tube (30) and is provided with a No. 2 inclined tube spray head (33).

5. The automatic spraying device for recovering condensate from PTA tail gas according to claim 1, characterized in that: The condensate collection tank (8) and the condensate outlet main pipe (11) are both provided with an emergency water supply pipe (23).

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