Deslagging system for vacuum liquid seal tank of polyester device

Abstract

The utility model belongs to the technical field of polyester devices, and relates to a vacuum liquid seal tank deslagging system of a polyester device, which comprises a liquid seal tank, a condensate pipeline, a filter, a suction pipeline, a suction valve, an expansion pipe, a vacuum pipeline, a vacuum valve and a vacuum pump, the filter comprises an inlet and a first outlet; the bottom of the inner chamber of the liquid seal tank is communicated with one end of a condensate pipeline, and the other end of the condensate pipeline is communicated with an inlet of the filter; a first outlet of the filter is communicated with one end of the suction pipeline, the other end of the suction pipeline is communicated with one end of the expansion pipe, and the suction valve is arranged on the suction pipeline; the other end of the expansion pipe is communicated with one end of the vacuum pipeline, the other end of the vacuum pipeline is communicated with the vacuum pump, and the vacuum valve is arranged on the vacuum pipeline. No valve is arranged between the liquid seal tank and the filter, residues in the liquid seal tank can be efficiently removed through vacuum suction of the expansion pipe and filtration of the filter, operation is easy, and cost is low.

Description

TECHNICAL FIELD

[0001] The utility model belongs to polyester device technical field relates to a polyester device vacuum liquid seal groove slag removal system. BACKGROUND

[0002] Polyester device vacuum liquid seal groove is the important equipment of polyester device vacuum system, it provides glycol for circulating pump and collects glycol condensate that vacuum spray system captures simultaneously. A large number of residual slag is entrained in glycol condensate and gathered in the inner chamber of liquid seal groove. The conventional method is to install a condensate discharge valve at the bottom of the inner chamber of liquid seal groove, the condensate discharge valve is connected with residual slag collection tank, opens the condensate discharge valve to discharge part of glycol and residual slag to residual slag collection tank during use, then closes the condensate discharge valve, and the residual slag in residual slag collection tank can be removed.

[0003] For example, the patent with the authorization announcement number CN202992650U discloses a kind of polyester device vacuum liquid seal groove glycol discharge system, as shown in Figure 1 The inner chamber bottom of liquid seal groove 1 is provided with discharge port, discharge port is connected with glycol pipeline 2, a condensate discharge valve 11 is installed between liquid seal groove 1 and residual slag collection tank 12 to discharge glycol and residual slag in glycol condensate;There is filter screen 13 at the lower layer of the inside of residual slag collection tank 12 to separate glycol and residual slag;Hand hole 14 is provided on the side above filter screen 13, and internal residual slag can be removed by opening hand hole;Degassing pipeline 15 is installed on the top of residual slag collection tank 12 and connected with the top of liquid seal groove 1;Low discharge pipeline and low point discharge valve 16 are installed on the low part of residual slag collection tank 12, and glycol filtrate is discharged from low discharge pipeline and low point discharge valve 16 to low point collection tank 17;Before operation, condensate discharge valve 11 and low point discharge valve 16 are closed, open condensate discharge valve 11 during operation, discharge glycol and residual slag in the inner chamber of liquid seal groove, close condensate discharge valve 11 after residual slag collection tank 12 is filled, open low point discharge valve 16;Close low point discharge valve 16 after glycol is exhausted, open hand hole 14 to remove residual slag.

[0004] But the above technical scheme has the following shortcomings and deficiencies: a small amount of residual slag often gets stuck in condensate discharge valve 11 during operation, condensate discharge valve 11 cannot be closed tightly, and the liquid level of liquid seal groove 1 will drop when operating worker opens low point discharge valve 16, which may cause production accident if not found in time, or cause glycol leakage when collecting residual slag by opening hand hole 14, affecting normal production and polluting the environment. At present, this slag removal method has been basically abandoned and replaced by manual removal, but manual removal is time-consuming and labor-intensive, and small residual slag is easily dropped into the outer chamber of liquid seal groove, blocking the spray pipeline and affecting normal production.

[0005] Therefore, it is necessary to develop a polyester device vacuum liquid seal groove slag removal system for efficiently removing residual slag in the liquid seal groove. UTILITY MODEL CONTENTS

[0006] The utility model discloses a polyester device vacuum liquid seal groove slag removal system.

[0007] To achieve the above object, the utility model adopts the technical scheme as follows:

[0008] A polyester device vacuum liquid seal groove slag removal system, including liquid seal groove, condensate pipeline, filter, suction pipeline, suction valve, expansion pipe, vacuum pipeline, vacuum valve and vacuum pump, the filter includes the entrance and first export,

[0009] The inner chamber bottom of the liquid seal groove is communicated with one end of the condensate pipeline, and the other end of the condensate pipeline is communicated with the entrance of the filter;

[0010] The first export of the filter is communicated with one end of the suction pipeline, and the other end of the suction pipeline is communicated with one end of the expansion pipe, and the suction valve is arranged on the suction pipeline;

[0011] The other end of the expansion pipe is communicated with one end of the vacuum pipeline, and the other end of the vacuum pipeline is communicated with the vacuum pump, and the vacuum valve is arranged on the vacuum pipeline;

[0012] The inner diameter of the expansion pipe is greater than the inner diameters of the condensate pipeline, the suction pipeline and the vacuum pipeline;

[0013] The principle of the utility model is as follows: through the vacuum suction effect of the fixed-volume expansion pipe, the ethylene glycol condensate is filtered in the filter from the inner chamber of the liquid seal groove through the condensate pipeline, and the ethylene glycol filtrate is collected in the expansion pipe, which can efficiently filter the residues in the ethylene glycol condensate in vacuum, and there is no valve between the liquid seal groove and the filter, so the valve does not contact the ethylene glycol condensate, and the residues in the ethylene glycol condensate can be prevented from being stuck in the valve.

[0014] As a preferred technical scheme:

[0015] The polyester device vacuum liquid seal groove slag removal system as described above, the total volume of the expansion pipe, the suction pipeline and the vacuum pipeline is equal to the volume of the inner chamber of the liquid seal groove, and such design is favorable for the expansion pipe and the above-mentioned pipelines to efficiently filter and collect the ethylene glycol filtrate in each batch treatment process.

[0016] The polyester device vacuum liquid seal groove slag removal system as described above further includes a low discharge pipeline and a low discharge valve, the filter further includes a second outlet, the second outlet is arranged at the bottom of the filter, the second outlet of the filter is communicated with one end of the low discharge pipeline, and the low discharge valve is arranged on the low discharge pipeline; the height of the position of the bottom of the expansion pipe is higher than the height of the position of the top of the filter, and such design is favorable for the ethylene glycol filtrate in the filter and the expansion pipe to be discharged from the second outlet of the filter under the action of its own gravity.

[0017] The vacuum liquid seal tank slag removal system of the polyester device as described above, the peripheral wall of the liquid seal tank is further provided with a recovery port, the other end of the low discharge pipeline is communicated with the recovery port, the position height of the bottom of the filter and the low discharge valve is higher than the position height of the recovery port of the liquid seal tank, and the design is favorable for the ethylene glycol filtrate in the filter and the expansion pipe to be discharged into the outer chamber of the liquid seal tank for storage under the action of gravity.

[0018] The vacuum liquid seal tank slag removal system of the polyester device as described above, the expansion pipe is in a vertical state, so that the ethylene glycol filtrate in the expansion pipe can be discharged into the outer chamber of the liquid seal tank more quickly.

[0019] The vacuum liquid seal tank slag removal system of the polyester device as described above, further comprises a nitrogen pipeline, a nitrogen valve and a nitrogen system, the nitrogen system is communicated with one end of the nitrogen pipeline, the other end of the nitrogen pipeline is communicated with the vacuum pipeline, and the nitrogen valve is arranged on the nitrogen pipeline; the communication point of the nitrogen pipeline and the vacuum pipeline is located between the expansion pipe and the vacuum valve, and the nitrogen valve is used for controlling the nitrogen discharge of the nitrogen system, so that the nitrogen can blow out the residual ethylene glycol filtrate in the expansion pipe, the suction pipeline, the filter and the low discharge pipeline.

[0020] The vacuum liquid seal tank slag removal system of the polyester device as described above, the filter is a basket filter, when the residual slag in the filter needs to be collected, only the top cover of the filter is opened, and the filter basket can be taken out.

[0021] Beneficial effects:

[0022] (1) The utility model discloses a liquid seal tank and filter between no valve, and the valve does not contact with the ethylene glycol condensate, avoids the residual slag in the ethylene glycol condensate and sticks to the valve, improves the removal efficiency of the residual slag in the liquid seal tank.

[0023] (2) The utility model discloses a vacuum suction effect of fixed volume expansion pipe, makes the ethylene glycol condensate in the inner chamber of the liquid seal tank enter the filter and filter, can not only vacuum high -efficient filtration residual slag in the ethylene glycol condensate, but also can rely on the expansion pipe and collect the ethylene glycol filtrate after filtering, and the operation is simple, and the cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the structure schematic diagram of the polyester device vacuum liquid seal tank ethylene glycol discharge system of prior art;

[0025] Figure 2 It is the structure schematic diagram of the utility model;

[0026] In the diagram, 1 is the liquid seal tank, 2 is the ethylene glycol pipeline, 201 is the condensate pipeline, 202 is the suction pipeline, 203 is the vacuum pipeline, 204 is the low-point discharge pipeline, 205 is the nitrogen pipeline, 3 is the low-point discharge valve, 4 is the filter, 401 is the first outlet, 402 is the second outlet, 403 is the inlet, 5 is the suction valve, 6 is the expansion pipe, 7 is the vacuum valve, 8 is the vacuum pump, 9 is the nitrogen valve, 10 is the nitrogen system, 11 is the condensate discharge valve, 12 is the residue collection box, 13 is the filter screen, 14 is the manhole, 15 is the degassing pipeline, 16 is the low-point discharge valve, and 17 is the low-point collection tank. Detailed Implementation

[0027] 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 present 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 present invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0028] like Figure 2 The vacuum liquid seal tank slag removal system of a polyester plant shown consists of a liquid seal tank 1, a condensate pipeline 201, a suction pipeline 202, a vacuum pipeline 203, a low-pressure discharge pipeline 204, a nitrogen pipeline 205, a low-pressure discharge valve 3, a filter 4, a suction valve 5, an expansion pipe 6, a vacuum valve 7, a vacuum pump 8, a nitrogen valve 9, and a nitrogen system 10; the filter 4 is a basket filter, with a first outlet 401 and an inlet 403 on the side wall of the filter 4, and a second outlet 402 at the bottom of the filter 4;

[0029] The liquid seal tank 1 is divided into two parts: an inner chamber and an outer chamber. The inner chamber is used to store the ethylene glycol condensate captured by the vacuum spray system, and the outer chamber is used to store the ethylene glycol filtrate after removing the residue. The bottom of the inner chamber of the liquid seal tank 1 is provided with a discharge port, which is connected to one end of the condensate pipeline 201. The other end of the condensate pipeline 201 is connected to the inlet 403 of the filter 4. The peripheral wall of the liquid seal tank 1 is provided with a recovery port.

[0030] The first outlet 401 of the filter 4 is connected to one end of the suction line 202, and the other end of the suction line 202 is connected to one end of the expansion pipe 6. The suction valve 5 is installed on the suction line 202.

[0031] The second outlet 402 of the filter 4 is connected to one end of the low discharge pipeline 204, and the other end of the low discharge pipeline 204 is connected to the recovery port of the liquid seal tank 1; the low discharge valve 3 is installed on the low discharge pipeline 204; the bottom of the filter 4 and the low discharge valve 3 are at a higher position than the recovery port of the liquid seal tank 1.

[0032] The other end of the expansion pipe 6 communicates with one end of a vacuum pipeline 203, the other end of the vacuum pipeline 203 communicates with a vacuum pump 8, and a vacuum valve 7 is arranged on the vacuum pipeline 203; the inner diameter of the expansion pipe 6 is larger than the inner diameters of the condensate pipeline 201, the suction pipeline 202 and the vacuum pipeline 203; the total volume of the expansion pipe 6, the suction pipeline 202 and the vacuum pipeline 203 is equal to the volume of the inner chamber of the liquid seal tank 1; one end of the expansion pipe 6 is open upward, and the other end is open downward, so that the expansion pipe 6 is in a vertical state; the position height of the bottom of the expansion pipe 6 is higher than the position height of the top of the filter 4.

[0033] The nitrogen system 10 communicates with one end of a nitrogen pipeline 205, the other end of the nitrogen pipeline 205 communicates with the vacuum pipeline 203, and a nitrogen valve 9 is arranged on the nitrogen pipeline 205; the communication point of the nitrogen pipeline 205 and the vacuum pipeline 203 is located between the expansion pipe 6 and the vacuum valve 7.

[0034] The polyester device vacuum liquid seal tank slag removal system of the utility model in operation, first confirm low exhaust valve 3, suction valve 5, vacuum valve 7, nitrogen valve 9 is closed, then slowly open vacuum valve 7, make expansion pipe 6 gradually reach vacuum state, about 2 minutes after closing vacuum valve 7, then open suction valve 5, the glycol condensate in the inner chamber of liquid seal tank 1 is passed through condensate pipeline 201 and enters filter 4, and the residue is filtered in filter 4, and the glycol filtrate is extracted into expansion pipe 6, then open low exhaust valve 3, and slightly open nitrogen valve 9 to destroy the vacuum of the system, and the residual glycol filtrate in the expansion pipe 6 and the pipeline system is fully discharged to the outer chamber of liquid seal tank 1, after the glycol filtrate is completely exhausted, close low exhaust valve 3, suction valve 5, nitrogen valve 9, finally open the top cover of filter 4, and take out the residue in the filter basket.

Claims

1. A polyester plant vacuum liquid seal tank dross removal system characterized by, The device comprises a liquid seal tank (1), a condensate pipeline (201), a filter (4), a suction pipeline (202), a suction valve (5), an expansion pipe (6), a vacuum pipeline (203), a vacuum valve (7) and a vacuum pump (8); the filter (4) comprises an inlet (403) and a first outlet (401); The inner chamber bottom of the liquid seal tank (1) is communicated with one end of the condensate pipeline (201), and the other end of the condensate pipeline (201) is communicated with the inlet (403) of the filter (4); The first outlet (401) of the filter (4) is communicated with one end of the suction pipeline (202), and the other end of the suction pipeline (202) is communicated with one end of the expansion pipe (6), and the suction valve (5) is arranged on the suction pipeline (202); The other end of the expansion pipe (6) is communicated with one end of the vacuum pipeline (203), and the other end of the vacuum pipeline (203) is communicated with the vacuum pump (8), and the vacuum valve (7) is arranged on the vacuum pipeline (203); The inner diameter of the expansion pipe (6) is greater than the inner diameters of the condensate pipeline (201), the suction pipeline (202) and the vacuum pipeline (203).

2. A polyester apparatus vacuum liquid seal trough dross removal system as claimed in claim 1, wherein, The total volume of the expansion pipe (6), the suction pipeline (202) and the vacuum pipeline (203) is equal to the volume of the inner chamber of the liquid seal tank (1).

3. A polyester apparatus vacuum liquid seal trough dross removal system as defined in claim 1, wherein, The device further comprises a low discharge pipeline (204) and a low discharge valve (3), the filter (4) further comprises a second outlet (402) arranged at the bottom of the filter (4), the second outlet (402) of the filter (4) is communicated with one end of the low discharge pipeline (204), and the low discharge valve (3) is arranged on the low discharge pipeline (204); the position height of the bottom of the expansion pipe (6) is higher than the position height of the top of the filter (4).

4. A polyester apparatus vacuum liquid seal trough dross removal system as claimed in claim 3, wherein, The peripheral wall of the liquid seal tank (1) is further provided with a recovery port, the other end of the low discharge pipeline (204) is communicated with the recovery port, and the position height of the bottom of the filter (4) and the low discharge valve (3) is higher than the position height of the recovery port of the liquid seal tank (1).

5. A polyester apparatus vacuum liquid seal trough dross removal system as claimed in claim 4, wherein, The expansion pipe (6) is in a vertical state.

6. A polyester apparatus vacuum liquid seal trough dross removal system as claimed in claim 5, wherein, The device further comprises a nitrogen pipeline (205), a nitrogen valve (9) and a nitrogen system (10), the nitrogen system (10) is communicated with one end of the nitrogen pipeline (205), the other end of the nitrogen pipeline (205) is communicated with the vacuum pipeline (203), and the nitrogen valve (9) is arranged on the nitrogen pipeline (205); the communication point of the nitrogen pipeline (205) and the vacuum pipeline (203) is located between the expansion pipe (6) and the vacuum valve (7).

7. A polyester apparatus vacuum liquid seal trough dross removal system as defined in claim 1, wherein, The filter (4) is a basket filter.

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