System for supplementing water for deaerator by using steam of waste incineration power plant

Abstract

The utility model discloses a system for supplementing water for a deaerator by utilizing steam of a waste incineration power plant. The system comprises a tubular heat exchanger penetrating through a drain pipeline of an air preheater and a water supplementing pipeline of the deaerator. Each pipeline is provided with a corresponding steam trap, a regulating valve, a check valve, an isolating valve and other accessories. Hot water in a drainage pipeline of the air preheater is subjected to temperature reduction, demineralized water in a water supplementing pipeline of the deaerator is heated, and energy exchange is achieved through reasonable valve arrangement and pipeline connection. Compared with the prior art, the system reduces vapor-liquid two-phase flow, protects equipment pipelines, prolongs the service life of equipment, reduces the thermal stress and water attack phenomena of the pipelines, enables a unit to operate more safely and stably, and is convenient to overhaul.

Description

Technical Field

[0001] The utility model relates to the technical field of waste incineration, in particular to a system for supplementing water to a deaerator by using the steam of a waste incineration power plant. Background Technique

[0002] At present, the temperature of the condensate water of the steam heat exchanger used in domestic waste incineration power plants is generally as high as 200-220°C. The hot condensate water is often recovered to the atmospheric thermal deaerator in the power plant. The long-term operating temperature of the deaerator is only 120-130°C. There is a temperature difference of 70-100°C between the two for a long time. This temperature difference causes a large amount of steam to be generated in the condensate water pipeline of the steam heat exchanger, resulting in a serious two-phase flow of steam and liquid in the condensate water pipeline of the steam heat exchanger, causing erosion and corrosion of the pipeline and weakening the pipeline life, bringing challenges to the safe and stable operation of the unit. In addition, some waste incineration power plants undertake the task of heat supply, and the amount of water replenished to the deaerator is large. The makeup water of the unit is directly replenished to the deaerator by a demineralized water pump. During actual operation, the temperature of the demineralized water is 20°C, and the temperature of the deaerator is about 120-130°C, resulting in frequent water hammer phenomena in the makeup water pipeline during the makeup water interval of the deaerator. In severe cases, even the pipeline flange is loosened and leaked. To improve the pain points encountered in the operation of the above two waste incineration power plants, a deaerator makeup water system needs to be designed. Content of the Utility Model

[0003] The purpose of the utility model is to provide a system for supplementing water to a deaerator by using the steam of a waste incineration power plant, and solve the above problems through a complete set of tube heat exchanger equipment and a heat exchanger that exchanges energy by combining the hot water in two heat pipes and its related accessories.

[0004] To achieve the above purpose, the utility model provides the following technical solutions:

[0005] A system for supplementing water to a deaerator by using the steam of a waste incineration power plant includes a tube heat exchanger, characterized in that the tube heat exchanger passes through an air preheater condensate water pipeline and a deaerator makeup water pipeline. An air trap is installed on the pipeline in front of the connection of the tube heat exchanger of the air preheater condensate water pipeline, and the pipeline behind the outlet of the tube heat exchanger is connected to the deaerator makeup water inlet; a deaerator makeup water regulating valve is installed on the pipeline in front of the connection of the tube heat exchanger of the deaerator makeup water pipeline, and the pipeline behind the outlet of the tube heat exchanger is connected to the deaerator makeup water inlet.

[0006] An air preheater trap to a check valve before the tube heat exchanger and a demineralized water makeup to a check valve before the tube heat exchanger are respectively installed on the front sides of the inlets of the air preheater condensate water pipeline and the deaerator makeup water pipeline to the tube heat exchanger.

[0007] Before the drain pipe of the air preheater and the feed water pipe of the deaerator are connected to the front side of the deaerator feed water inlet, a demineralized water make-up to deaerator head check valve and a demineralized water make-up to deaerator isolation valve are respectively installed, and a air drain to deaerator head check valve and an air drain to deaerator head isolation valve are respectively installed on one side of the valves.

[0008] Before and after the air trap, an air trap front isolation valve and an air trap rear isolation valve are respectively installed, and a bypass channel is provided on the outer side of the front and rear valves. An air trap bypass valve is installed in the bypass channel.

[0009] Before and after the deaerator feed water regulating valve, a deaerator feed water regulating valve front isolation valve and a deaerator feed water regulating valve rear isolation valve are respectively installed, and a bypass channel is provided on the inner side of the front and rear valves. A deaerator feed water regulating valve bypass valve is installed in the bypass channel.

[0010] On the outlet side of the tubular heat exchanger, a tubular heat exchanger rear air preheater drain isolation valve and a tubular heat exchanger rear demineralized water make-up isolation valve are respectively installed on the air preheater drain pipe and the deaerator feed water pipe. A tubular heat exchanger vent valve is installed at the upper end of the tubular heat exchanger, and a tubular heat exchanger blowdown valve is installed at the bottom.

[0011] The air preheater drain pipe is connected in a curved shape using a bend from its outlet side of the tubular heat exchanger to the deaerator feed water inlet section.

[0012] The hot water in the air preheater drain pipe is cooled down through a tubular heat exchanger, and the demineralized water in the deaerator make-up water pipe enters the tubular heat exchanger for heating. The air preheater drain trap to the check valve in front of the tubular heat exchanger installed on the front side of the tubular heat exchanger plays a role in preventing backflow. The demineralized water make-up to the check valve in front of the tubular heat exchanger on the front side of the tubular heat exchanger also functions to prevent backflow. The temperature of the hot water in the air preheater drain pipe drops from 200 - 220 °C to about 120 - 140 °C. During this process, when the air drain trap needs to be repaired, the isolation valve in front of the air drain trap and the isolation valve behind the air drain trap can be closed, and the bypass valve of the air drain trap can be opened to ensure the continuous operation of the system. The isolation valve in front of the deaerator make-up regulating valve, the isolation valve behind the deaerator make-up regulating valve, the bypass channel inside, and the bypass valve of the deaerator make-up regulating valve before and after the deaerator make-up regulating valve also have similar functions, facilitating the maintenance of the deaerator make-up regulating valve and the response to faults. The various check valves and isolation valves installed respectively on the front side of the air preheater drain pipe and the deaerator make-up pipe when accessing the deaerator make-up port can effectively control the flow direction of hot water and demineralized water, ensuring the stability and safety of the system operation. The vent valve of the tubular heat exchanger at the upper end of the tubular heat exchanger can be used to discharge the non-condensable gas inside, and the drain valve at the bottom of the tubular heat exchanger is used to discharge the possible accumulated impurities and dirt, ensuring the normal operation of the heat exchanger. The air preheater drain pipe is connected in a curved shape using a bend in the section from the outlet side of the tubular heat exchanger to the deaerator make-up port, thereby relieving the stress of the pipe and increasing the service life of the pipe.

[0013] Compared with the prior art, the beneficial effects of the present utility model are:

[0014] The air preheater drain water is cooled down through the tubular heat exchanger, and the temperature drops from 200 - 220 °C to about 120 - 140 °C. During the process of recovering the hot water to the deaerator, the existence of the vapor-liquid two-phase flow is greatly reduced, thereby protecting the air preheater drain pipe and the elbows on the air preheater drain pipe, and increasing the equipment life. The demineralized water is heated through the tubular heat exchanger, and the temperature rises from 20 °C to 120 - 130 °C, making its operation closer to the temperature of the deaerator itself when entering the deaerator, reducing the thermal stress of the pipe, weakening the vibration of the demineralized water make-up pipe, reducing the frequent water hammer phenomenon occurring in the demineralized water make-up pipe during the make-up interval, reducing the risk of leakage due to loosening of the pipe flange, and making the unit operation safer and more stable. And a hot water isolation valve is provided, which is beneficial for maintenance. Description of the Drawings

[0015] Figure 1 It is a system diagram of using the steam of a waste incineration power plant to supplement water to the deaerator for the present utility model;

[0016] In the figure: 1. Deaerator; 2. Air preheater drain pipe; 3. Deaerator make-up water pipe; 4. Elbow; 5. Isolation valve before air trap; 6. Isolation valve after air trap; 7. Air trap; 8. Air trap bypass valve; 9. Isolation valve before deaerator make-up water regulating valve; 10. Deaerator make-up water regulating valve; 11. Isolation valve after deaerator make-up water regulating valve; 12. Deaerator make-up water regulating valve bypass valve; 13. Check valve for demineralized water make-up to deaerator head; 14. Isolation valve for demineralized water make-up to deaerator; 15. Check valve for air drain to deaerator head; 16. Isolation valve for air drain to deaerator head; 17. Check valve for demineralized water make-up to before tubular heat exchanger; 18. Check valve for air preheater trap to before tubular heat exchanger; 19. Tubular heat exchanger; 20. Vent valve of tubular heat exchanger; 21. Blowdown valve of tubular heat exchanger; 22. Isolation valve for demineralized water make-up after tubular heat exchanger; 23. Isolation valve for air preheater drain after tubular heat exchanger. Detailed implementation manner

[0017] Next, the technical solutions in the embodiments of the present invention will be completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0018] As Figure 1 shown, a deaerator make-up water system using the steam of a waste incineration power plant includes a tubular heat exchanger 19, characterized in that the tubular heat exchanger 19 passes through the air preheater drain pipe 2 and the deaerator make-up water pipe 3. The air preheater drain pipe 2 is installed with an air trap 7 on the front-side pipe before its connection to the tubular heat exchanger 19, and the pipe on the rear side of the outlet of the tubular heat exchanger 19 is connected to the make-up water port of the deaerator 1. The deaerator make-up water pipe 3 is installed with a deaerator make-up water regulating valve 10 on the front-side pipe before its connection to the tubular heat exchanger 19, and the pipe on the rear side of the outlet of the tubular heat exchanger 19 is connected to the make-up water port of the deaerator 1.

[0019] Before the connection ports of the air preheater drain pipe 2 and the deaerator make-up water pipe 3 to the tubular heat exchanger 19, a check valve for air preheater trap to before tubular heat exchanger 18 and a check valve for demineralized water make-up to before tubular heat exchanger 17 are respectively installed.

[0020] Before the connection ports of the air preheater drain pipe 2 and the deaerator make-up water pipe 3 to the make-up water port of the deaerator 1, a check valve for demineralized water make-up to deaerator head 13 and an isolation valve for demineralized water make-up to deaerator 14 are respectively installed, and a check valve for air drain to deaerator head 15 and an isolation valve for air drain to deaerator head 16 are respectively installed on one side of the valves.

[0021] Before and after the air trap 7, an isolation valve before air trap 5 and an isolation valve after air trap 6 are respectively installed, and a bypass channel is provided on the outer side of the front and rear valves, and the bypass channel is installed with an air trap bypass valve 8.

[0022] Before and after the deaerator makeup water regulating valve 10, a deaerator makeup water regulating valve front isolation valve 9 and a deaerator makeup water regulating valve rear isolation valve 11 are respectively installed, and a bypass channel is provided on the inner side of the front and rear valves. The bypass channel is equipped with a deaerator makeup water regulating valve bypass valve 12.

[0023] On the outlet side of the tubular heat exchanger 19 of the air preheater drain pipe 2 and the deaerator makeup water pipe 3, a tubular heat exchanger rear air preheater drain isolation valve 23 and a tubular heat exchanger rear desalted water makeup isolation valve 22 are respectively installed. A tubular heat exchanger vent valve is installed at the upper end of the tubular heat exchanger 19, and a tubular heat exchanger blowdown valve 21 is installed at the bottom.

[0024] The air preheater drain pipe 2 is connected in a curved shape using a bent pipe 4 from the outlet side of its tubular heat exchanger 19 to the water inlet of the deaerator 1.

[0025] The hot water in the air preheater drain pipe 2 is cooled down through the tubular heat exchanger 19, and the desalted water in the deaerator makeup water pipe 3 enters the tubular heat exchanger 19 for heating. The air preheater drainer to the tubular heat exchanger front check valve 18 provided on the front side of the tubular heat exchanger 19 plays a role in preventing backflow. The desalted water makeup to the tubular heat exchanger front check valve 17 on the front side of the tubular heat exchanger 19 also performs the function of preventing backflow. The temperature of the hot water in the air preheater drain pipe 2 drops from 200 - 220 °C to about 120 - 140 °C. During this process, when the air drainer 7 needs to be repaired, the air drainer front isolation valve 5 and the air drainer rear isolation valve 6 can be closed, and the air drainer bypass valve 8 can be opened to ensure the continuous operation of the system. The deaerator makeup water regulating valve front isolation valve 9 and the deaerator makeup water regulating valve rear isolation valve 11 before and after the deaerator makeup water regulating valve 10, as well as the inner bypass channel and the deaerator makeup water regulating valve bypass valve 12, also have a similar function, facilitating the maintenance and fault response of the deaerator makeup water regulating valve 10. The various check valves and isolation valves installed on the front side of the water inlet of the deaerator 1 for the air preheater drain pipe 2 and the deaerator makeup water pipe 3 can effectively control the flow direction of the hot water and the desalted water, ensuring the stability and safety of the system operation. The tubular heat exchanger vent valve at the upper end of the tubular heat exchanger 19 can be used to discharge the non-condensable gas inside, and the tubular heat exchanger blowdown valve 21 at the bottom is used to discharge the possible accumulated impurities and dirt to ensure the normal operation of the heat exchanger. The air preheater drain pipe 2 is connected in a curved shape using a bent pipe 4 from the outlet side of the tubular heat exchanger 19 to the water inlet of the deaerator 1, thereby relieving the stress of the pipeline and increasing the service life of the pipeline.

Claims

1. A make-up water system for a deaerator using the steam of a waste incineration power plant, comprising a tubular heat exchanger (19), characterized in that The described tubular heat exchanger (19) passes through the air preheater drain pipe (2) and the deaerator make-up water pipe (3). An air trap (7) is installed on the front-side pipe of the air preheater drain pipe (2) before its connection to the tubular heat exchanger (19), and the rear-side pipe at the outlet of the tubular heat exchanger (19) is connected to the make-up water inlet of the deaerator (1). An deaerator make-up water regulating valve (10) is installed on the front-side pipe of the deaerator make-up water pipe (3) before its connection to the tubular heat exchanger (19), and the rear-side pipe at the outlet of the tubular heat exchanger (19) is connected to the make-up water inlet of the deaerator (1).

2. A deaerator make-up water system using the steam of a waste incineration power plant according to claim 1, characterized in that: An air preheater trap to tubular heat exchanger front check valve (18) and a demineralized water make-up to tubular heat exchanger front check valve (17) are respectively installed on the front side of the connection inlet of the air preheater drain pipe (2) and the deaerator make-up water pipe (3) to the tubular heat exchanger (19).

3. A deaerator make-up water system using the steam of a waste incineration power plant according to claim 1, characterized in that: A demineralized water make-up to deaerator head check valve (13) and a demineralized water make-up to deaerator isolation valve (14) are respectively installed on the front side of the connection of the air preheater drain pipe (2) and the deaerator make-up water pipe (3) to the make-up water inlet of the deaerator (1), and an air trap to deaerator head check valve (15) and an air trap to deaerator head isolation valve (16) are respectively installed on one side of the valves.

4. A deaerator make-up water system using the steam of a waste incineration power plant according to claim 1, characterized in that: An air trap front isolation valve (5) and an air trap rear isolation valve (6) are respectively installed in front of and behind the air trap (7), and a bypass channel is provided on the outer side of the front and rear valves. An air trap bypass valve (8) is installed in the bypass channel.

5. A deaerator make-up water system using the steam of a waste incineration power plant according to claim 1, characterized in that: A deaerator make-up water regulating valve front isolation valve (9) and a deaerator make-up water regulating valve rear isolation valve (11) are respectively installed in front of and behind the deaerator make-up water regulating valve (10), and a bypass channel is provided on the inner side of the front and rear valves. A deaerator make-up water regulating valve bypass valve (12) is installed in the bypass channel.

6. A deaerator make-up water system using the steam of a waste incineration power plant according to claim 1, characterized in that: A tubular heat exchanger rear air preheater drain isolation valve (23) and a tubular heat exchanger rear demineralized water make-up isolation valve (22) are respectively installed on the outlet side of the air preheater drain pipe (2) and the deaerator make-up water pipe (3) to the tubular heat exchanger (19). An air vent valve is installed at the upper end of the tubular heat exchanger (19), and a tubular heat exchanger blowdown valve (21) is installed at the bottom.

7. A deaerator make-up water system using the steam of a waste incineration power plant according to claim 1, characterized in that: The section of the air preheater drain pipe (2) from the outlet side of the tubular heat exchanger (19) to the make-up water inlet of the deaerator (1) is connected in a curved shape using a bend pipe (4).

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