Equipment for improving operation cycle and high-temperature drainage water of thermal regeneration tower

Abstract

The utility model provides equipment for improving the operation cycle of a thermal regeneration tower and high-temperature water drainage, which comprises the thermal regeneration tower, a main reboiler of the thermal regeneration tower and a standby reboiler of the thermal regeneration tower, a thermal regeneration tower is connected with a thermal regeneration tower main reboiler through a thermal regeneration tower main reboiler 1 # valve and a thermal regeneration tower main reboiler 2 # valve, the thermal regeneration tower is connected with a thermal regeneration tower standby reboiler through a thermal regeneration tower standby reboiler 1 # valve and a thermal regeneration tower standby reboiler 2 # valve, and the top of the thermal regeneration tower is connected with a methanol heat exchanger, a water cooler and an H2S fraction separator. And the H2S fraction separator is communicated with the thermal regeneration tower through a thermal regeneration tower reflux pump. The thermal regeneration tower main reboiler and the thermal regeneration tower standby reboiler are matched with each other, so that the operation cycle of the thermal regeneration system is prolonged, the safety risk caused by leakage of methanol to a condensate pipe network is reduced, the following interlocking control functions are added, the automatic regulation control function is realized, and the thermal regeneration tower is economical and practical.

Description

Technical Field

[0001] This utility model belongs to the field of thermal regeneration tower technology, specifically relating to a device for improving the operating cycle and high-temperature drainage of thermal regeneration towers. Background Technology

[0002] In the existing Linde low-temperature methanol washing methanol regeneration process in Germany, sulfur-rich methanol from the H2S concentration tower enters the thermal regeneration tower. The reboiler at the bottom of the tower provides the heat source, which is supplied by low-pressure saturated steam at 0.5 MPa and 158°C. The light components at the top of the tower, namely methanol vapor and acid gas, are cooled by a methanol heat exchanger and a water cooler before entering the H2S fractionation tank. The liquid phase is pressurized by the reflux pump of the thermal regeneration tower and enters the top of the thermal regeneration tower as reflux. The uncondensed acid components are fed into a thermal power boiler as raw material for the production of ammonium sulfate. The lean methanol obtained from the bottom of the thermal regeneration tower is recycled. The high-temperature effluent pressure of the entire plant is 0.35 MPa, the temperature is 130°C, and the discharge rate is 40 t / h into a nearby ditch, which increases the company's energy consumption.

[0003] Based on this, a device for improving the operating cycle of the thermal regeneration tower and the high-temperature drainage is proposed. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a device that improves the operating cycle of the thermal regeneration tower and the high-temperature drainage, in order to address the shortcomings of the prior art mentioned above.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a device for improving the operating cycle of a thermal regeneration tower and high-temperature drainage water, including a thermal regeneration tower, a main reboiler of the thermal regeneration tower and a backup reboiler of the thermal regeneration tower.

[0006] The sulfur-rich methanol from the H2S concentration tower enters the thermal regeneration tower. The thermal regeneration tower is connected to the main reboiler of the thermal regeneration tower through valve 1# and valve 2#. The thermal regeneration tower is connected to the backup reboiler of the thermal regeneration tower through valve 1# and valve 2#.

[0007] The inlet of the main reboiler of the thermal regeneration tower is also connected to a low-pressure saturated steam inlet flow meter and a steam flow regulating valve for the main reboiler of the thermal regeneration tower. The outlet of the main reboiler of the thermal regeneration tower is also connected to a front hand valve for the main reboiler steam condensate filter, a main reboiler steam condensate filter, a rear hand valve for the main reboiler steam condensate filter, a steam condensate drain valve for the main reboiler, an online methanol analyzer for the main reboiler steam condensate of the thermal regeneration tower, and a quick shut-off valve for the main reboiler steam condensate of the thermal regeneration tower.

[0008] The inlet of the standby reboiler in the thermal regeneration tower is connected to a high-temperature drain water flow meter and a high-temperature drain water flow regulating valve. The outlet of the standby reboiler in the thermal regeneration tower is connected to a front hand valve of the condensate filter, a condensate filter, a rear hand valve of the condensate filter, a condensate drain valve, a quick shut-off valve at the condensate outlet of the standby reboiler, and an online methanol analyzer at the condensate outlet of the standby reboiler.

[0009] The top of the thermal regeneration tower is connected to a methanol heat exchanger, a water cooler, and an H2S fraction separator. The H2S fraction separator is connected to the thermal regeneration tower via a thermal regeneration tower reflux pump.

[0010] As a further explanation of this utility model, a differential pressure gauge for the condensate filter of the main reboiler of the thermal regeneration tower is connected to the condensate outlet pipe of the main reboiler of the thermal regeneration tower.

[0011] As a further explanation of this utility model, the low-pressure saturated steam is fed into the equipment in two ways. One way is fed into the main reboiler flow meter connection pipeline, and the other way is fed into the hot regeneration tower standby reboiler high-temperature drain water flow meter connection pipeline. In addition, a low-pressure saturated steam flow regulating valve for the standby reboiler is also connected to the hot regeneration tower standby reboiler high-temperature drain water flow meter connection pipeline.

[0012] As a further explanation of this utility model, the high-temperature drainage water is fed into two devices. One channel is fed into the high-temperature drainage water flow meter connection pipeline of the hot regeneration tower standby reboiler, and the other channel is connected to the plant-wide high-temperature drainage water discharge shut-off valve, and the discharge is controlled by the plant-wide high-temperature drainage water discharge shut-off valve.

[0013] This utility model has the following advantages compared with the prior art:

[0014] This invention improves the operating cycle of the thermal regeneration system by coordinating the main reboiler and the standby reboiler of the thermal regeneration tower. High-temperature effluent from the entire plant is introduced into the standby reboiler to provide a heat source. The low-temperature effluent after heat exchange and the steam condensate from the main reboiler are separately analyzed by an online methanol analyzer and then enter the condensate recovery device. This reduces the safety risk of methanol leakage into the condensate pipeline network. The invention also adds interlocking control functions and achieves automatic adjustment and control, making it economical and practical. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall principle of this utility model.

[0016] Explanation of reference numerals in the attached figures:

[0017] 1-Hot regeneration tower; 2-Hot regeneration tower main reboiler; 3-Methanol heat exchanger; 4-Water cooler; 5-H2S fraction separator; 6-Hot regeneration tower reflux pump; 7-Low-pressure saturated steam inlet flow meter for main reboiler; 8-Hot regeneration tower main reboiler steam flow regulating valve; 9-Main reboiler steam condensate filter pre-hand valve; 10-Main reboiler steam condensate filter; 11-Main reboiler steam condensate filter post-hand valve; 12-Main reboiler steam condensate drain valve; 13-Hot regeneration tower main reboiler steam condensate methanol online analyzer; 14-Hot regeneration tower main reboiler steam condensate quick shut-off valve; 15-Hot regeneration tower main reboiler condensate filter differential pressure gauge; 16-Hot regeneration tower main reboiler #1 valve; 17-Hot regeneration tower main reboiler #2 valve. #Valve; 18-Standby reboiler for hot regeneration tower; 19-Standby reboiler #1 valve for hot regeneration tower; 20-Standby reboiler #2 valve for hot regeneration tower; 21-High-temperature drain water flow meter for standby reboiler for hot regeneration tower; 22-High-temperature drain water flow regulating valve for standby reboiler for hot regeneration tower; 23-Pre-hand valve for condensate filter of standby reboiler for hot regeneration tower; 24-Condensate filter of standby reboiler for hot regeneration tower; 25-Rear-hand valve for condensate filter of standby reboiler for hot regeneration tower; 26-Condensate drain valve for standby filter of hot regeneration tower; 27-Quick shut-off valve for condensate outlet of standby reboiler; 28-Methanol online analyzer for condensate outlet of standby reboiler; 29-Low-pressure saturated steam flow regulating valve for standby reboiler; 30-High-temperature drain water discharge shut-off valve for the entire plant. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] like Figure 1 As shown, this utility model provides a technical solution: a device for improving the operating cycle of a thermal regeneration tower and high-temperature drainage water, including a thermal regeneration tower 1, a main reboiler 2 of the thermal regeneration tower, and a backup reboiler 18 of the thermal regeneration tower;

[0020] Among them, sulfur-rich methanol from the H2S concentration tower enters the thermal regeneration tower 1. The thermal regeneration tower 1 is connected to the main reboiler 2 through the main reboiler 1# valve 16 and the main reboiler 2# valve 17. The thermal regeneration tower 1 is connected to the backup reboiler 18 through the backup reboiler 1# valve 19 and the backup reboiler 2# valve 20.

[0021] The inlet of the main reboiler 2 of the thermal regeneration tower is also connected to a low-pressure saturated steam inlet flow meter 7 and a steam flow regulating valve 8 of the main reboiler of the thermal regeneration tower. The outlet of the main reboiler 2 of the thermal regeneration tower is also connected to a front hand valve 9 of the main reboiler steam condensate filter, a main reboiler steam condensate filter 10, a rear hand valve 11 of the main reboiler steam condensate filter, a steam condensate drain valve 12 of the main reboiler, an online methanol analyzer for the main reboiler steam condensate of the thermal regeneration tower 13, and a quick shut-off valve 14 for the main reboiler steam condensate of the thermal regeneration tower.

[0022] The condensate outlet pipe of the main reboiler 2 of the thermal regeneration tower is connected to a differential pressure gauge 15 for the condensate filter of the main reboiler of the thermal regeneration tower.

[0023] The low-pressure saturated steam is fed into the equipment in two ways. One way is fed into the main reboiler flow meter 7 connecting pipeline, and the other way is fed into the hot regeneration tower standby reboiler high-temperature drain water flow meter 21 connecting pipeline. A low-pressure saturated steam flow regulating valve 29 is also connected to the hot regeneration tower standby reboiler high-temperature drain water flow meter 21 connecting pipeline.

[0024] The inlet of the standby reboiler 18 in the thermal regeneration tower is connected to a high-temperature drain water flow meter 21 and a high-temperature drain water flow regulating valve 22. The outlet of the standby reboiler 18 in the thermal regeneration tower is connected to a front hand valve 23 of the condensate filter, a condensate filter 24 of the standby reboiler, a rear hand valve 25 of the condensate filter, a condensate drain valve 26 of the standby filter, a quick shut-off valve 27 for the condensate outlet of the standby reboiler, and an online methanol analyzer 28 for the condensate outlet of the standby reboiler.

[0025] The high-temperature drain water is fed into two equipment. One line is sent to the high-temperature drain water flow meter 21 connecting pipeline of the hot regeneration tower standby reboiler, and the other line is connected to the whole plant high-temperature drain water discharge shut-off valve 30, and the discharge is controlled by the whole plant high-temperature drain water discharge shut-off valve 30.

[0026] The top of the thermal regeneration tower 1 is connected to a methanol heat exchanger 3, a water cooler 4, and an H2S fraction separator 5. The H2S fraction separator 5 is connected to the thermal regeneration tower 1 through a thermal regeneration tower reflux pump 6.

[0027] When in use, sulfur-rich methanol from the H2S concentration tower enters the thermal regeneration tower 1, and the main reboiler 2 and the standby reboiler 18 of the thermal regeneration tower, which are connected to the thermal regeneration tower 1, provide the heat source. Among them, the high-temperature effluent from the whole plant at 0.35MPa, 130℃, and 40t / h enters the standby reboiler 18 of the thermal regeneration tower to provide most of the heat source, while a small amount of low-pressure saturated steam at 0.5MPa and 158℃ enters the main reboiler 2 of the thermal regeneration tower. The temperature of the bottom of the thermal regeneration tower 1 is always controlled to reach 99.4℃ to ensure the purity of lean methanol.

[0028] The light components at the top of the thermal regeneration tower 1, including some methanol vapor and acid gas, are cooled by the methanol heat exchanger 3 and the water cooler 4 before entering the H2S fraction separator 5.

[0029] The liquid phase is pressurized by the reflux pump 6 and enters the top of the thermal regeneration tower 1 as reflux. The uncondensed acidic components are fed into the thermal power boiler as raw materials for the production of ammonium sulfate. The bottom of the thermal regeneration tower 1 yields lean methanol for recycling.

[0030] High-temperature plant drainage water at 0.35MPa, 130℃, and 40t / h enters the standby reboiler 18 of the thermal regeneration tower for heat exchange, forming condensate. After mechanical impurities are filtered out by the condensate filter 24 of the standby reboiler, the methanol content is determined to be <1ppm by the online methanol analyzer 28 at the condensate outlet of the standby reboiler and then sent to the condensate recovery unit.

[0031] A small amount of low-pressure saturated steam at 0.5 MPa and 158°C enters the main reboiler 2 of the thermal regeneration tower. The condensate formed after heat exchange is filtered by the main reboiler steam condensate filter 10 to remove mechanical impurities. After the methanol content is determined to be <1 ppm by the online methanol analyzer 13 of the main reboiler steam condensate of the thermal regeneration tower, it enters the condensate recovery device.

[0032] During normal operation, the pressure difference between the main reboiler steam condensate filter 10 and the standby reboiler condensate filter 24 in the thermal regeneration tower shall not exceed 50 kPa.

[0033] During normal operation, when the methanol content in the methanol condensate of the main reboiler of the thermal regeneration tower is greater than 1 ppm, the low-pressure saturated steam inlet flow regulating valve 29 is automatically opened, the high-temperature drain water flow regulating valve 22 of the standby reboiler of the thermal regeneration tower is closed, the high-temperature drain water discharge shut-off valve 30 of the whole plant is opened, and the steam flow regulating valve 8 of the main reboiler of the thermal regeneration tower and the steam condensate quick shut-off valve 14 of the main reboiler of the thermal regeneration tower are automatically closed, realizing the automatic switching function.

[0034] During normal operation, when the methanol content in the methanol online analyzer 28 at the standby reboiler condensate outlet is greater than 1 ppm, the high-temperature drain water flow regulating valve 22 of the standby reboiler in the thermal regeneration tower and the quick shut-off valve 28 at the standby reboiler condensate outlet are automatically closed, and the high-temperature drain water discharge shut-off valve 30 of the whole plant is opened to discharge the high-temperature drain water to the ditch; the opening degree of the steam flow regulating valve 8 of the main reboiler in the thermal regeneration tower is automatically adjusted according to the system load.

[0035] During normal operation, when the differential pressure gauge 15 of the condensate filter of the main reboiler in the thermal regeneration tower displays ≥50kPa, the low-pressure saturated steam inlet flow regulating valve 29 of the standby reboiler is automatically opened, the high-temperature drain water flow regulating valve 22 of the standby reboiler in the thermal regeneration tower is closed, the high-temperature drain water discharge shut-off valve 30 of the whole plant is opened, and the steam flow regulating valve 8 of the main reboiler in the thermal regeneration tower and the steam condensate quick shut-off valve 14 of the main reboiler in the thermal regeneration tower are closed, thereby preventing the methanol quality of the thermal regeneration tower 1 from declining due to the blockage of the steam condensate filter 10 of the main reboiler.

[0036] During normal operation, when the condensate filter 24 of the standby reboiler in the thermal regeneration tower displays ≥50kPa, the steam flow regulating valve 8 of the main reboiler in the thermal regeneration tower is automatically opened, while the high-temperature drain water flow regulating valve 22 of the standby reboiler in the thermal regeneration tower is closed, the high-temperature drain water discharge cut-off valve 30 of the whole plant is opened, and the quick shut-off valve 28 of the condensate outlet of the standby reboiler is closed to prevent the methanol quality of the bottom of the thermal regeneration tower 1 from declining due to the blockage of the condensate filter 24 of the standby reboiler in the thermal regeneration tower.

[0037] This invention enables effective recovery of all effluent from the plant, reduces steam consumption, and extends the operating cycle of the heat regeneration system.

[0038] Furthermore, in this embodiment, the high-temperature drainage water of the entire plant at 0.35MPa, 130℃, and 40t / h is introduced into the standby reboiler 18 of the thermal regeneration tower, which reduces the amount of low-pressure saturated steam at 0.5MPa and 158℃ entering the main reboiler 2 of the thermal regeneration tower.

[0039] For example, a company in Xinjiang has an annual output of 2 billion cubic meters. 3 For a natural gas company, the steam consumption of the reboiler in the low-temperature methanol washing and regeneration tower is 54t / h. If this embodiment is adopted, it can generate a profit of about 20 million yuan / year for the company. The company's profit is calculated as: high-temperature drainage volume × price of low-pressure superheated steam. Currently, the market price of 0.5MPa, 158℃ steam is 84 yuan / t, which contributes to the company's energy conservation and consumption reduction, and is economical and practical.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for improving the operating cycle and high-temperature drainage of a thermal regeneration tower, characterized in that: It includes a thermal regeneration tower (1), a main reboiler for the thermal regeneration tower (2), and a backup reboiler for the thermal regeneration tower (18). The sulfur-rich methanol from the H2S concentration tower enters the thermal regeneration tower (1). The thermal regeneration tower (1) is connected to the main reboiler (2) of the thermal regeneration tower through valve 1 (16) and valve 2 (17). The thermal regeneration tower (1) is connected to the backup reboiler (18) of the thermal regeneration tower through valve 1 (19) and valve 2 (20). The inlet of the main reboiler (2) of the thermal regeneration tower is also connected to a low-pressure saturated steam inlet flow meter (7) and a steam flow regulating valve (8) of the main reboiler of the thermal regeneration tower. The outlet of the main reboiler (2) of the thermal regeneration tower is also connected to a front hand valve (9) of the main reboiler steam condensate filter, a main reboiler steam condensate filter (10), a rear hand valve (11) of the main reboiler steam condensate filter, a steam condensate drain valve (12) of the main reboiler, an online methanol analyzer (13) of the main reboiler steam condensate of the thermal regeneration tower, and a quick shut-off valve (14) of the main reboiler steam condensate of the thermal regeneration tower. The inlet of the standby reboiler (18) of the thermal regeneration tower is connected to a high-temperature drain water flow meter (21) and a high-temperature drain water flow regulating valve (22). The outlet of the standby reboiler (18) of the thermal regeneration tower is connected to a front hand valve (23) of the condensate filter of the standby reboiler of the thermal regeneration tower, a condensate filter (24) of the standby reboiler of the thermal regeneration tower, a rear hand valve (25) of the condensate filter of the standby reboiler of the thermal regeneration tower, a condensate drain valve (26) of the standby filter of the thermal regeneration tower, a quick shut-off valve (27) of the condensate outlet of the standby reboiler, and an online methanol analyzer (28) of the condensate outlet of the standby reboiler. The top of the thermal regeneration tower (1) is connected to a methanol heat exchanger (3), a water cooler (4) and an H2S fraction separator (5), and the H2S fraction separator (5) is connected to the thermal regeneration tower (1) through a thermal regeneration tower reflux pump (6).

2. The device for improving the operating cycle and high-temperature drainage of a thermal regeneration tower according to claim 1, characterized in that, The condensate outlet pipe of the main reboiler (2) of the thermal regeneration tower is connected to a differential pressure gauge (15) for the condensate filter of the main reboiler of the thermal regeneration tower.

3. The device for improving the operating cycle and high-temperature drainage of a thermal regeneration tower according to claim 1, characterized in that, Low-pressure saturated steam is fed into the equipment in two ways. One way is fed into the main reboiler flow meter (7) connecting pipeline, and the other way is fed into the hot regeneration tower standby reboiler high-temperature drain water flow meter (21) connecting pipeline. A low-pressure saturated steam flow regulating valve (29) for the standby reboiler is also connected to the hot regeneration tower standby reboiler high-temperature drain water flow meter (21) connecting pipeline.

4. The device for improving the operating cycle and high-temperature drainage of a thermal regeneration tower according to claim 1, characterized in that, The high-temperature drainage water is sent to the equipment in two ways. One way is sent to the pipeline of the high-temperature drainage water flow meter (21) of the hot regeneration tower standby reboiler, and the other way is connected to the whole plant high-temperature drainage water discharge shut-off valve (30). The discharge is controlled by the whole plant high-temperature drainage water discharge shut-off valve (30).

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