A device for recovering low-pressure steam from a deaerator

Abstract

The utility model discloses a kind of transformation deaerator low-pressure steam emptying recovery device, including transformation deaerator, the upper portion of transformation deaerator is equipped with low-pressure steam emptying pipe, the upper end of deaerator low-pressure emptying is connected with negative pressure pipe, and the end of negative pressure pipe away from low-pressure steam emptying pipe is connected on the inlet end of steam absorption ejector suction chamber.Compared with prior art, the utility model is by using condensate recovery water pump to extract condensate in condensate recovery water pool, pressurized to 0.5-0.6Mpa, transported to steam absorption ejector nozzle, as jet source, form negative pressure in steam absorption ejector suction chamber, steam absorption ejector suction chamber is connected with transformation deaerator low-pressure steam emptying, the negative pressure generated in steam absorption ejector suction chamber, the low-pressure steam emptying of transformation deaerator is absorbed into steam absorption ejector suction chamber and water carries out heat transfer, mass transfer, condenses into water, to achieve the purpose of recovery.

Description

Technical Field

[0001] This utility model relates to the field of equipment vent steam recovery technology, specifically a low-pressure steam vent recovery device for a deaerator. Background Technology

[0002] Based on the characteristics of boiler water deaerators, they are widely used in various technical fields such as coal chemical industry, power system, petrochemical enterprise, and pharmaceutical enterprise, and are important equipment to ensure the safe operation of boilers and thermal systems. Currently, in existing technology, the low-pressure steam vented from traditional shift converter deaerators is directly released into the atmosphere, which causes three problems: First, the steam vented into the atmosphere condenses upon cooling, forming droplets and producing a large amount of condensate, causing water accumulation on the ground. In summer, moss grows on the ground, and in winter, the ground freezes, making it easy for inspection personnel to slip and fall (posing a significant safety hazard). Second, condensate dripping onto equipment and platforms accelerates corrosion and reduces service life. Third, directly venting the steam from the shift converter into the atmosphere results in the waste of low-pressure steam. According to actual analysis, the condensate from this vented steam has the following characteristics: pH value: CL - Alkalinity: The analysis results indicate that this water can be used as washing water in the syngas scrubbing tower at the gasification station of the aerospace furnace, reducing the amount of fresh water used. To address this issue and achieve the recovery and reuse of vented steam from the shift deaerator, while simultaneously eliminating safety hazards and extending the service life of equipment and facilities, this invention proposes a low-pressure steam vent recovery device for shift deaerators. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a low-pressure steam venting and recovery device for a deaerator to solve the following problems: (1) A large amount of low-pressure steam is directly vented from the deaerator, resulting in waste. (2) The vented low-pressure steam condenses upon cooling and forms droplets, generating a large amount of condensate, causing water accumulation on the ground. In summer, moss grows on the ground, and in winter, the ground freezes, making it easy for inspection personnel to fall and get injured (posing a significant safety hazard). (3) Condensate drips onto equipment and platforms, accelerating equipment and platform corrosion and reducing service life.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a low-pressure steam venting and recovery device for a shift deaerator, comprising a shift deaerator, wherein a low-pressure steam venting pipe is provided at the upper part of the shift deaerator, a negative pressure pipe is connected to the upper end of the low-pressure venting pipe of the deaerator, and the end of the negative pressure pipe away from the low-pressure steam venting pipe is connected to the inlet end of the suction chamber of a steam absorption ejector, the outlet end of the steam absorption ejector is connected to a condensate recovery water tank, a vacuum tank is installed on the condensate recovery water tank, one end of the vacuum tank is connected to the inlet end of a condensate recovery water pump, and the outlet end of the condensate recovery water pump is connected to a first connecting pipe and a second connecting pipe, the first connecting pipe is installed at the inlet end of the nozzle of the steam absorption ejector, and the end of the second connecting pipe away from the condensate recovery water pump is connected to the shell side of a stripping condensate heat exchanger.

[0005] As a preferred technical solution of this utility model, a pressure relief pipe is installed on the negative pressure pipe, and an overpressure safety relief valve is installed on the pressure relief pipe.

[0006] As a preferred technical solution of this utility model, the condensate recovery water tank is equipped with a remote liquid level display transmitter.

[0007] As a preferred technical solution of this utility model, the second connecting pipe is provided with a regulating valve group, and the regulating valve group is controlled in a cascade loop with the remote liquid level display transmitter on the condensate recovery water tank.

[0008] As a preferred technical solution of this utility model, the top of the vacuum tank is provided with a water supply valve and an exhaust valve for supplying water and venting air from the vacuum tank.

[0009] As a preferred technical solution of this utility model, the outlet pressure of the condensate recovery water pump is controlled at 0.5-0.6MPa.

[0010] As a preferred technical solution of this utility model, the pressure of the deaerator is controlled at 0.04-0.06 MPa.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] This invention relates to a low-pressure steam venting and recovery device for a shift converter deaerator. It utilizes a condensate recovery pump to draw condensate from a condensate recovery tank, pressurizes it to 0.5-0.6 MPa, and delivers it to the nozzle of a steam absorption ejector as a jet source. This creates a negative pressure in the steam absorption ejector's suction chamber, which is connected to the shift converter deaerator's low-pressure steam venting system. The negative pressure in the suction chamber draws the vented low-pressure steam into the steam absorption ejector, where it undergoes heat and mass transfer with water, condensing into water and achieving recovery. This effectively prevents the direct venting of large amounts of low-pressure steam, thus avoiding waste. It also addresses the safety hazards caused by steam condensing into droplets and prevents equipment and platform corrosion, thereby extending service life.

[0013] In summary, this utility model has a simple structure and is easy to install and use. It fully utilizes the principles of fluid dynamics and pressure transmission of steam absorption ejectors, creating a low-pressure area through high-speed fluid jetting to draw in gas or liquid, thereby completing the transfer of energy and mass. This enables the recovery and reuse of vented steam from the deaerator, while simultaneously eliminating workplace safety hazards and extending the service life of equipment and facilities.

[0014] Other features and advantages of this invention will be described in detail in the following specific embodiments. Attached Figure Description

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

[0016] In the diagram: 1. Deaerator; 2. Low-pressure steam vent pipe; 20. Vent valve; 3. Steam absorption ejector; 4. Negative pressure pipe; 40. Overpressure safety relief valve; 5. Condensate recovery tank; 6. Remote level display transmitter; 7. Condensate recovery pump; 71. First connecting pipe; 72. Second connecting pipe; 8. Vacuum tank; 9. Stripping condensate heat exchanger; 10. Control valve assembly. Detailed Implementation

[0017] Please see Figure 1In this embodiment, a low-pressure steam venting and recovery device for a shift deaerator includes a shift deaerator 1. A low-pressure steam venting pipe 2 is provided on the upper part of the shift deaerator 1. A negative pressure pipe 4 is connected to the upper end of the low-pressure venting pipe 2. The end of the negative pressure pipe 4 away from the low-pressure steam venting pipe 2 is connected to the inlet end of the suction chamber of a steam absorption ejector 3. The outlet end of the steam absorption ejector 3 is connected to a condensate recovery water tank 5. A vacuum tank 8 is installed on the condensate recovery water tank 5. One end of the vacuum tank 8 is connected to the inlet end of a condensate recovery water pump 7. The outlet end of the condensate recovery water pump 7 is connected to a first connecting pipe 71 and a second connecting pipe 72. The first connecting pipe 71 is installed at the inlet end of the nozzle of the steam absorption ejector 3. The end of the second connecting pipe 72 away from the condensate recovery water pump 7 is connected to the shell side of a stripping condensate heat exchanger 9. After being pressurized to 5.0 MPa by the pump, the condensate is transported to the gasification syngas scrubbing tower as fresh water makeup water. A regulating valve assembly 10 is installed on the second connecting pipe 72. The regulating valve assembly 10 is cascaded with the remote level display transmitter 6 on the condensate recovery water tank 5 for remote self-adjustment of the condensate recovery water tank level. The top of the vacuum tank 8 is equipped with a water supply valve and an exhaust valve for water supply and exhaust. The outlet pressure of the condensate recovery water pump 7 is controlled at 0.5-0.6 MPa, and the pressure of the deaerator 1 is controlled at 0.04-0.06 MPa. To achieve remote DCS control operation, a remote level display transmitter 6 is installed in the condensate recovery water tank 5. An automatic regulating valve 10 is installed on the shell-side pipeline of the stripping condensate heat exchanger 9 on the second connecting pipe 72. When the level of the recovery water tank is not within the process parameters, the regulating valve assembly 10 is controlled by the DCS to achieve self-adjustment. To prevent the condensate recovery water pump 7 from malfunctioning and causing overpressure in the deaerator, a pressure relief pipe is installed on the negative pressure pipe 4, and an overpressure safety relief valve 40 is installed on the pressure relief pipe.

[0018] The condensate in the condensate recovery tank 5 is pumped by the condensate recovery water pump 7, pressurized to 0.5-0.6 MPa, and delivered to the nozzle of the steam absorption ejector 3 as a jet source. A negative pressure is created in the suction chamber of the steam absorption ejector 3. The suction chamber of the steam absorption ejector 3 is connected to the low-pressure steam vent of the shift deaerator. The negative pressure generated in the suction chamber of the steam absorption ejector 3 draws the low-pressure steam vented from the shift deaerator into the suction chamber, where it undergoes heat and mass transfer with water, condensing into water, thus achieving the purpose of recovery. The recovered steam... The condensate returns to the condensate recovery pool 5. The outlet of the condensate recovery pump 7 is connected to a separate pipeline to the shell side of the stripping condensate heat exchanger 9 for continuous external condensate recovery. This cycle improves the production efficiency of the aerospace furnace unit. After the deaerator steam condensate is recovered, a portion is mixed with the stripped condensate, pressurized by a pump, and sent to the gasification syngas scrubbing tower for recycling, reducing fresh water consumption. The other portion is used for mass and heat transfer between the steam absorber and deaerator steam before returning to the underground recovery pool, achieving the recycling and reuse of deaerator steam. This technology is an effective resource recovery and energy-saving emission reduction technology, improving the production efficiency of the aerospace furnace unit.

[0019] In summary, this utility model features a simple structure and convenient installation and use. It fully utilizes the principles of fluid dynamics and pressure transmission of steam absorption ejectors, generating a low-pressure zone through high-speed fluid jetting to draw in gas or liquid, thereby completing the transfer of energy and mass. This enables the recovery and reuse of vented steam from the deaerator, while simultaneously eliminating workplace safety hazards and extending the service life of equipment and facilities.

[0020] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A low-pressure steam venting and recovery device for a shift deaerator, characterized in that, The system includes a deaerator (1), with a low-pressure steam vent pipe (2) at its upper part. The upper end of the low-pressure vent pipe (2) is connected to a negative pressure pipe (4), and the end of the negative pressure pipe (4) away from the low-pressure steam vent pipe (2) is connected to the inlet end of the suction chamber of the steam absorption ejector (3). The outlet end of the steam absorption ejector (3) is connected to a condensate recovery water tank (5), and a vacuum tank (8) is installed on the condensate recovery water tank (5). One end of the vacuum tank (8) is connected to the inlet end of the condensate recovery water pump (7), and the outlet end of the condensate recovery water pump (7) is connected to a first connecting pipe (71) and a second connecting pipe (72). The first connecting pipe (71) is installed at the inlet end of the nozzle of the steam absorption ejector (3), and the end of the second connecting pipe (72) away from the condensate recovery water pump (7) is connected to the shell side of the stripping condensate heat exchanger (9).

2. The low-pressure steam venting and recovery device for a shift converter deaerator according to claim 1, characterized in that, A pressure relief pipe is installed on the negative pressure pipe (4), and an overpressure safety relief valve (40) is installed on the pressure relief pipe.

3. The low-pressure steam venting and recovery device for a shift converter deaerator according to claim 1, characterized in that, The condensate recovery tank (5) is equipped with a remote liquid level display transmitter (6).

4. A low-pressure steam venting and recovery device for a shift converter deaerator according to claim 3, characterized in that, The second connecting pipe (72) is equipped with a regulating valve group (10), which is cascaded with the remote liquid level display transmitter (6) on the condensate recovery water tank 5.

5. A low-pressure steam venting and recovery device for a shift converter deaerator according to claim 1, characterized in that, The top of the vacuum tank (8) is equipped with a water supply valve and an exhaust valve for supplying water and venting air from the vacuum tank.

6. A low-pressure steam venting and recovery device for a shift converter deaerator according to claim 3, characterized in that, The outlet pressure of the condensate recovery pump (7) is controlled at 0.5-0.6 MPa.

7. A low-pressure steam venting and recovery device for a shift converter deaerator according to claim 3, characterized in that, The pressure of the deaerator (1) is controlled at 0.04-0.06 MPa.

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