Low-pressure exhaust steam recycling and white smoke elimination system

Abstract

The utility model relates to energy recovery field, concretely relates to a low pressure exhaust steam recycling and white elimination system. The purpose is to provide a low pressure exhaust steam recycling and white elimination system, the device should be able to effectively recover exhaust steam waste heat, greatly reduce white smoke phenomenon, and reduce equipment maintenance quantity and equipment maintenance cost. Technical scheme is a low pressure exhaust steam recycling and white elimination system, its characterized in that: the system includes condensate tank, water tank, exhaust steam ejector, exhaust steam import pipeline, desalted water import pipeline, backflow pipeline and outlet pipeline, the condensate tank is provided with exhaust steam export and backwater mouth, exhaust steam export is connected with the exhaust steam import pipeline one inlet of exhaust steam ejector for discharging the steam generated by condensate tank overpressure operation, and backwater mouth is connected with the outlet of exhaust steam ejector through backflow pipeline, another inlet of exhaust steam ejector is connected with the desalted water pipe network of outside through desalted water import pipeline, the outlet of exhaust steam ejector is also connected with water tank through outlet pipeline.

Description

Technical Field

[0001] This utility model relates to the field of energy recovery, specifically to a low-pressure exhaust steam recovery and utilization system and a whitening elimination system. Background Technology

[0002] Because power plant boilers and industrial waste heat boilers generate unnecessary steam due to adjustments in operating parameters, the direct emission of excess steam into the air not only wastes energy but also produces a large amount of "white smoke," which can corrode surrounding equipment and pose certain safety hazards to operators.

[0003] CN222069339U discloses a low-pressure waste steam recovery heat exchange device, including a heat exchange shell connected to a waste steam nozzle and a power nozzle. The power nozzle has a tapered structure, with the tapered end serving as the outlet. The outlet extends into the heat exchange shell and connects to one end of a power chamber, the other end of which is connected to the inlet of a heat exchange chamber. The heat exchange chamber also has a tapered structure, with the inlet at the tapered end. The other end of the heat exchange chamber, away from its inlet, is connected to a buffer oxygen deaerator. Several through holes are provided on the wall of the power chamber, and several through holes are also provided on the wall at the inlet end of the heat exchange chamber. This device can recover waste steam without backflow. However, the structure of this device is relatively complex, and the waste steam recovery efficiency needs improvement. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the above-mentioned background technology and provide a low-pressure waste steam recovery and white smoke elimination system; the device should be able to effectively recover the waste heat of waste steam, significantly reduce the white smoke phenomenon, and reduce the amount and cost of equipment maintenance.

[0005] The technical solution provided by this utility model is:

[0006] A low-pressure waste steam recovery and whitening elimination system, characterized in that: the system includes a condensate tank, a water tank, a waste steam ejector, a waste steam inlet pipe, a demineralized water inlet pipe, a return pipe, and an outlet water pipe;

[0007] The condensate tank is equipped with a waste steam outlet and a return water outlet. The waste steam outlet is connected to one inlet of the waste steam ejector through a waste steam inlet pipe to discharge the steam generated by the overpressure operation of the condensate tank. The return water outlet is connected to the outlet of the waste steam ejector through a return pipe. The other inlet of the waste steam ejector is connected to the external demineralized water network through a demineralized water inlet pipe. The outlet of the waste steam ejector is also connected to the water tank through a water outlet pipe.

[0008] The exhaust steam inlet pipeline includes a shut-off valve connected in sequence through a pipeline, a bypass pipeline formed by a water-side self-regulating valve and a bypass valve connected in parallel, and a steam exhaust device. The above configuration simplifies the number of valves and ensures system safety.

[0009] The return pipeline includes a steam-side self-regulating valve, a throttle valve, and a check valve connected in sequence via pipelines.

[0010] The demineralized water inlet pipeline includes a pressure measuring device and a regulating valve connected in sequence through the pipeline.

[0011] The outlet end of the exhaust steam ejector is equipped with a pressure measuring device and a temperature measuring device.

[0012] The exhaust steam ejector is positioned as close as possible to the condensate tank and at the same height as the condensate tank.

[0013] The exhaust steam inlet pipeline is arranged horizontally, with the pipeline length as short as possible, and the valves are centrally located.

[0014] The water tank is a float-type water tank.

[0015] Compared with the prior art, this utility model has the following advantages and effects:

[0016] (1) This utility model can effectively recover the waste heat of exhaust steam, save energy, and thus significantly reduce steam emissions and greatly reduce the white smoke phenomenon (white smoke elimination), improve the on-site operating environment, and also reduce equipment maintenance and equipment maintenance costs.

[0017] (2) The steam-side self-regulating valve can automatically open and close according to the pressure fluctuation of the condensate tank, and has the adjustability and automaticity of waste steam recovery; the water-side self-regulating valve can directly introduce demineralized water to the condensate tank for pressure stabilization when the water tank cannot recover mixed water and a certain pressure is reached.

[0018] (3) The present invention has a simple and reasonable structure, low electrical instrument configuration and equipment cost, and reliable operation and long-term stable operation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the system structure of an embodiment of the present utility model.

[0020] Numbered in the diagram: 1. Condensate tank; 2. Water tank; 3. Float-type level gauge; 4. Exhaust gas ejector; 5. Exhaust gas inlet pipe; 6. Steam-side self-regulating valve; 7. Shut-off valve; 8. Bypass valve; 9. Water-side self-regulating valve; 10. Throttling valve; 11. Check valve; 12. Return pipe; 13. Demineralized water inlet pipe; 14. Water outlet pipe; 15. Pressure measuring device; 16. Temperature measuring device; 17. Regulating valve; 18. Steam exhaust device; 19. Water inlet pipe; 20. Demineralized water network. Detailed Implementation

[0021] The following description, in conjunction with the embodiments shown in the accompanying drawings, provides further details.

[0022] Figure 1 The low-pressure waste steam recovery and whitening system shown includes a condensate tank 1, a water tank 2, a waste steam ejector 4, a waste steam inlet pipe 5, a demineralized water inlet pipe 13, a return pipe 12, and an outlet pipe 14. Specifically: the condensate tank is equipped with an inlet pipe 19, through which condensate containing waste steam from external equipment (such as a boiler condenser) is input into the condensate tank; the condensate tank is also equipped with a waste steam outlet and a return water inlet. The waste steam outlet is connected to the waste steam inlet pipe 5 to discharge steam generated during overpressure operation of the condensate tank; the return water inlet is connected to the return pipe 12. The two inlets of the waste steam ejector are connected to the demineralized water inlet pipe 13 and the waste steam inlet pipe 5, respectively; the outlet of the waste steam ejector is connected to the water tank 2 (preferably a float-type water tank) via the outlet pipe 14, and this outlet is also connected to the condensate tank via the return pipe 12.

[0023] The exhaust steam inlet pipeline includes a bypass pipeline, a shut-off valve 7, and an exhaust steam device 18 that are sequentially connected between the exhaust steam ejector inlet and the condensate tank exhaust steam outlet. The bypass pipeline is formed by the parallel connection of a water-side self-regulating valve and a bypass valve 8.

[0024] The demineralized water inlet pipeline 13 includes a pressure measuring device 15 and a regulating valve 17 connected between another inlet of the exhaust steam ejector and the demineralized water pipeline network 20 via a pipeline.

[0025] The return pipeline 12 includes a steam-side self-regulating valve 9, a throttle valve 10, and a check valve 11, which are connected in sequence between the outlet of the exhaust steam ejector and the exhaust steam return port of the condensate tank.

[0026] The water outlet pipe 14 is connected between the outlet of the exhaust steam ejector and the inlet of the water tank 3.

[0027] Obviously, since the outlet of the exhaust steam ejector is connected to both the return pipe 12 and the outlet water pipe 14, only one T-joint is needed to connect the outlet of the exhaust steam ejector, the return pipe 12 and the outlet water pipe. In addition, a pressure measuring device 15 and a regulating valve temperature measuring device 16 are installed on the pipe between the outlet of the exhaust steam ejector and the T-joint.

[0028] As a preferred option, the exhaust steam ejector should be placed as close as possible to the condensate tank and at the same height as the condensate tank.

[0029] The exhaust steam inlet pipeline is arranged horizontally, with the pipeline length as short as possible, and the valves are centrally located.

[0030] The water tank is preferably a float-type water tank, and the liquid level is controlled by a float level gauge 3.

[0031] The working principle of this invention is as follows: When excessive condensate enters through the inlet pipe, causing overpressure in the condensate tank and generating waste steam, the steam-side self-regulating valve opens, introducing the waste steam into the ejector for secondary recovery and reuse. The waste steam then flows into the float-type water tank. As the waste steam is recovered, the pressure in the condensate tank gradually decreases and stabilizes, and the steam-side self-regulating valve closes. When the float-type water tank is full and cannot absorb the waste steam and ejector outlet water, the steam-side self-regulating valve cannot open due to high back pressure. The pressure before the water-side self-regulating valve gradually increases to the opening pressure, directly drawing demineralized water back to the condensate tank for cooling and pressure stabilization, thereby preventing the generation of waste steam.

Claims

1. A low-pressure exhaust steam recovery and whitening elimination system, characterized in that: The system includes a condensate tank (1), a water tank (2), a waste steam ejector (4), a waste steam inlet pipe (5), a demineralized water inlet pipe (13), a return pipe (12), and an outlet pipe (14); The condensate tank is equipped with a waste steam outlet and a return water outlet. The waste steam outlet is connected to one inlet of the waste steam ejector through the waste steam inlet pipe (5) to discharge the steam generated by the overpressure operation of the condensate tank. The return water outlet is connected to the outlet of the waste steam ejector through the return pipe (12). The other inlet of the waste steam ejector is connected to the external demineralized water network (20) through the demineralized water inlet pipe (13). The outlet of the waste steam ejector is also connected to the water tank (2) through the water outlet pipe (14).

2. The low-pressure exhaust steam recovery and whitening system according to claim 1, characterized in that: The exhaust steam inlet pipeline includes a shut-off valve (7) connected in sequence through a pipeline, a bypass pipeline formed by the parallel connection of a water-side self-regulating valve (6) and a bypass valve (8), and an exhaust steam device (18), in order to simplify the number of valves and ensure system safety.

3. The low-pressure exhaust steam recovery and whitening system according to claim 2, characterized in that: The return pipeline (12) includes a steam-side self-regulating valve (9), a throttle valve (10), and a check valve (11) connected in sequence through a pipeline.

4. The low-pressure exhaust steam recovery and whitening system according to claim 3, characterized in that: The demineralized water inlet pipeline (13) includes a pressure measuring device (15) and a regulating valve (17) connected by a pipeline.

5. The low-pressure exhaust steam recovery and whitening system according to claim 4, characterized in that: The outlet end of the exhaust steam ejector is equipped with a pressure measuring device and a temperature measuring device (16).

6. The low-pressure exhaust steam recovery and whitening system according to claim 5, characterized in that: The exhaust steam ejector is positioned as close as possible to the condensate tank and at the same height as the condensate tank.

7. The low-pressure exhaust steam recovery and whitening system according to claim 6, characterized in that: The exhaust steam inlet pipeline is arranged horizontally, with the pipeline length as short as possible, and the valves are centrally located.

8. The low-pressure exhaust steam recovery and whitening system according to claim 7, characterized in that: The water tank is a float-type water tank.

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