Continuous blow-down water recycling device for coke dry quenching boiler

Abstract

The utility model provides a continuous blow-off water recycling device for a coke dry quenching boiler, which belongs to the technical field of boiler blow-off water and comprises a boiler blow-off pipeline, a secondary steam pipeline, a deaerator, a recycling pipeline and a sewage purifier. The boiler blow-off pipeline comprises a boiler drum, a continuous blow-off pipeline and a continuous blow-off expander, and the two ends of the continuous blow-off pipeline are connected with the boiler drum and the continuous blow-off expander respectively; one end of the secondary steam pipeline is connected with the continuous blowdown expander, and a throttle valve and a check valve are arranged on the secondary steam pipeline; the deaerator is connected with the other end of the secondary steam pipeline; according to the continuous blow-down expander, the cyclic utilization pipeline and the sewage purifier are combined for use, so that the blow-down water is recycled after being treated, the phenomenon of corrosion in the pipeline is reduced, and the pressure in the continuous blow-down expander is controlled through the throttling valve, so that the stable flash evaporation process is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to dry quenching boiler continuous sewage recycling device technical field, concretely relates to a dry quenching boiler continuous sewage recycling device. BACKGROUND

[0002] In the patent application No. 202022014256.1, a device for reducing the temperature of boiler sewage is proposed. The application ensures that the temperature of the cooled boiler sewage can reach below 50℃, meets the discharge requirements, has higher reliability, and is easy to operate.

[0003] However, in the prior art, if the cooled sewage is discharged without sufficient treatment, it may pollute the water body, and the pollutants in the sewage remaining in the inner wall of the pipeline can easily cause corrosion of the pipeline. Moreover, when the sewage enters the continuous sewage expander for flash expansion reaction, the flash process cannot be ensured to proceed stably. UTILITY MODEL CONTENTS

[0004] Based on the above technical problems, the utility model provides a dry quenching boiler continuous sewage recycling device. The application combines the use of recycling pipelines and sewage purifiers to recycle the treated sewage, thereby reducing the phenomenon of internal corrosion of the pipeline. Moreover, the pressure inside the continuous sewage expander is controlled by a throttle valve, thereby ensuring that the flash process proceeds stably.

[0005] The specific technical solution is as follows:

[0006] A dry quenching boiler continuous sewage recycling device comprises a boiler sewage pipeline, a secondary steam pipeline, a deaerator, a recycling pipeline, and a sewage purifier. The boiler sewage pipeline comprises a boiler drum, a continuous sewage pipeline, and a continuous sewage expander. The two ends of the continuous sewage pipeline are connected to the boiler drum and the continuous sewage expander, respectively. One end of the secondary steam pipeline is connected to the continuous sewage expander, and a throttle valve and a check valve are provided on the secondary steam pipeline. The deaerator is connected to the other end of the secondary steam pipeline. The recycling pipeline comprises a sewage pipeline, a desalted water tank, and a circulating water main pipe. A coil is provided inside the deaerator. The two ends of the sewage pipeline are connected to one end of the coil and the continuous sewage expander, respectively. The circulating water main pipe comprises a circulating water return pipeline and a circulating water outlet pipeline, and the other end of the coil is connected to the circulating water return pipeline. The sewage purifier is provided between the sewage pipeline and the desalted water tank. A double-layer filter membrane is provided in the sewage purifier, and at least two staggered guide plates are provided between the double-layer filter membranes.

[0007] In addition, the dry quenching boiler continuous sewage recycling device according to the above technical solution of the utility model can have the following additional technical features:

[0008] In the above technical solution, further comprising: a standby pipeline and a standby blowdown expander; one end of the standby pipeline is in communication with the continuous blowdown expander, and a standby valve is arranged on the standby pipeline; the other end of the standby pipeline is in communication with the standby blowdown expander.

[0009] In the above technical solution, further comprising: a first valve and a second valve; the first valve is arranged at the blowdown water pipeline; and the second valve is arranged at the water outlet of the coil pipe.

[0010] In the above technical solution, further comprising: a safety valve; the safety valve is arranged on the continuous blowdown expander.

[0011] In the above technical solution, the double-layer water filtering membrane comprises a pre-filtering membrane and a fine-filtering membrane.

[0012] Compared with the prior art, the dry quenching boiler continuous blowdown water recycling device has the beneficial effects that:

[0013] 1. The recycling pipeline and the sewage purifier are combined for use, so that the blowdown water is filtered first and then enters the coil pipe and the liquid in the desalted water tank for heat exchange, so that the blowdown water is cooled and the liquid in the desalted water tank is heated, and then the blowdown water enters the circulating water return pipeline, so that the blowdown water is recycled; and by removing the pollutants in the blowdown water, the risk of corrosion of the internal structure of the pipeline is reduced, and the service life of the device is prolonged.

[0014] 2. The boiler continuous blowdown water enters the continuous blowdown expander, is expanded by flash evaporation, and the generated secondary steam enters the deaerator through the top secondary steam pipeline, and the pressure in the continuous blowdown expander is controlled through the throttle valve, so as to ensure that the flash evaporation process is stable and prevent safety hazards caused by excessively high or low pressure.

[0015] 3. After the secondary steam enters the deaerator, the dissolved oxygen and other gases in the water are removed, so as to reduce the corrosion risk of the boiler system.

[0016] 4. At least two staggered guide plates are arranged between the pre-filtering membrane and the fine-filtering membrane, so that the sewage is uniformly distributed on the surface of the fine-filtering membrane, local overload is avoided, the contact time of the sewage and the fine-filtering membrane is increased, and the filtering effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a schematic view of a dry quenching boiler continuous blowdown water recycling device according to the present application;

[0018] In the above technical solution, further comprising: a first valve and a second valve; the first valve is arranged at the blowdown water pipeline; and the second valve is arranged at the water outlet of the coil pipe. Figure 1 The correspondence between the reference signs and the component names in the above technical solution is as follows:

[0019] 10 Boiler drum, 11 Continuous blowdown pipe, 12 Continuous blowdown expander, 13 Secondary steam pipe, 14 Throttle valve, 15 Check valve, 16 Sewage pipe, 17 Demineralized water tank, 18 Circulating water return pipe, 19 Circulating water outlet pipe, 20 Coil, 21 Sewage purifier, 22 Guide plate, 23 Backup pipe, 24 Backup valve, 25 Backup blowdown expander, 26 First valve, 27 Second valve, 28 Safety valve, 29 Pre-filter membrane, 30 Fine filter membrane, 31 Circulating water main pipe, 32 Deaerator. Detailed Implementation

[0020] The following are specific implementation cases and appendices. Figure 1 The present invention will be further described below, but the present invention is not limited to these embodiments.

[0021] A continuous wastewater recycling device for dry quenching coke boilers, such as Figure 1 As shown, it includes: a boiler blowdown pipeline, a secondary steam pipeline 13, a deaerator 32, a recycling pipeline, and a wastewater purifier 21; the boiler blowdown pipeline includes a boiler drum 10, a continuous blowdown pipeline 11, and a continuous blowdown expander 12, with both ends of the continuous blowdown pipeline 11 connected to the boiler drum 10 and the continuous blowdown expander 12, respectively; one end of the secondary steam pipeline 13 is connected to the continuous blowdown expander 12, and the secondary steam pipeline 13 is equipped with a throttle valve 14 and a check valve 15; the deaerator 32 is connected to the other end of the secondary steam pipeline 13; the recycling pipeline includes... The system includes a sewage discharge pipe 16, a demineralized water tank 17, and a circulating water main pipe 31. The deoxygenated water tank is equipped with a coil 20. Both ends of the sewage discharge pipe 16 are connected to one end of the coil 20 and the continuous sewage expansion device 12, respectively. The circulating water main pipe 31 includes a circulating water return pipe 18 and a circulating water outlet pipe 19, and the other end of the coil 20 is connected to the circulating water return pipe 18. A sewage purifier 21 is installed between the sewage discharge pipe 16 and the demineralized water tank 17. The sewage purifier 21 is equipped with a double-layer filter membrane, and at least two staggered guide plates 22 are provided between the double-layer filter membrane.

[0022] With the above structure, the boiler continuously discharges water into the continuous blowdown expander 12, and after flash expansion, the generated secondary steam enters the deaerator 32 through the secondary steam pipeline 13 at the top, and the pressure inside the continuous blowdown expander 12 is controlled through the throttle valve 14, thereby ensuring that the flash expansion process is stable and preventing safety hazards caused by excessively high or low pressure; the sewage in the continuous blowdown expander 12 enters the sewage purifier 21 through the sewage pipeline 16, and after the sewage is filtered, it enters the coil pipe 20 to exchange heat with the liquid in the desalted water tank 17, so that the sewage is cooled and the liquid in the desalted water tank 17 is heated, and then enters the circulating water return pipeline 18, thereby realizing the recycling of the sewage; after the pollutants in the sewage are removed, it enters the coil pipe 20 and the circulating water return pipeline 18, thereby reducing the risk of corrosion of the internal structure of the pipeline, and prolonging the service life of the device.

[0023] Specifically, after the secondary steam enters the deaerator 32, the dissolved oxygen and other gases in the water are removed, thereby reducing the corrosion risk of the boiler system.

[0024] Specifically, the pressure inside the continuous blowdown expander 12 is controlled at 0.5-0.6MPa through the throttle valve 14 on the secondary steam pipeline 13.

[0025] Specifically, by transferring the heat of the sewage to the desalted water in the desalted water tank 17, the temperature of the desalted water is increased, thereby indirectly reducing the use amount of low-pressure steam in the deaerator 32.

[0026] In the embodiment of the utility model, still include: spare pipeline 23 and spare blowdown expander 25, one end of spare pipeline 23 with continuous blowdown expander 12 is linked together, and be equipped with spare valve 24 on spare pipeline 23, spare blowdown expander 25 with the other end of spare pipeline 23 is linked together.

[0027] By setting up spare pipeline 23 and spare blowdown expander 25, when continuous blowdown expander 12 breaks down, sewage can be discharged through spare blowdown expander 25.

[0028] In the embodiment of the utility model, still include: first valve 26 and second valve 27, first valve 26 sets up at sewage pipeline 16 place, second valve 27 sets up at the water outlet of coil pipe 20.

[0029] In the embodiment of the utility model, still include: safety valve 28, and continuous blowdown expander 12 is equipped with safety valve 28.

[0030] In the embodiment of the utility model, double-layer filter membrane includes pre-filter membrane 29 and fine filter membrane 30.

[0031] By adding at least two staggered guide plates 22 between the pre-filtering membrane 29 and the fine filtering membrane 30, the sewage is uniformly distributed on the surface of the fine filtering membrane 30, local overload is avoided, the contact time of the sewage and the fine filtering membrane 30 is increased, and the filtering effect is improved.

[0032] Specifically, the pre-filtering membrane performs preliminary treatment on the sewage, and filters and removes large particles in the sewage; the fine filtering membrane 30 is a filtering membrane with smaller pore size, and is used for removing small pollutants such as dissolved salts, heavy metal ions, bacteria and viruses.

[0033] During implementation, when the continuous sewage in the boiler enters the continuous sewage expander 12, the secondary steam generated after flash expansion enters the deaerator 32 through the secondary steam pipeline 13 at the top, and the pressure inside the continuous sewage expander 12 is controlled through the throttle valve 14, so that the flash expansion process is stable, and the safety hidden danger caused by excessively high or low pressure is prevented; the sewage in the continuous sewage expander 12 enters the sewage purifier 21 through the sewage pipeline 16, and after the sewage is filtered, the sewage enters the coil pipe 20 to exchange heat with the liquid in the desalted water tank 17, so that the sewage is cooled, and the liquid in the desalted water tank 17 is heated, and then enters the circulating water return pipeline 18, so that the sewage is recycled; after the pollutants in the sewage are removed, the sewage enters the coil pipe 20 and the circulating water return pipeline 18, so that the risk of internal structure corrosion of the pipeline is reduced, and the service life of the device is prolonged.

[0034] In the description of the present application, the term "a plurality of" refers to two or more than two, unless otherwise explicitly limited, and the terms "upper", "lower" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application; the terms "connection", "installation", "fixation" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, can also be detachable connection, or integral connection; can be directly connected, or indirectly connected through an intermediate medium. For ordinary skilled persons in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] In the description of the present application, the terms "one embodiment", "some embodiments", "a specific embodiment" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A continuous blowdown water recycling device for a dry quenching boiler, characterized by, The utility model relates to a boiler blowdown pipeline, a secondary steam pipeline, a deaerator, a recycling pipeline, a sewage purifier, a standby pipeline and a standby blowdown expander. The boiler blowdown pipeline comprises a boiler drum, a continuous blowdown pipeline and a continuous blowdown expander, two ends of the continuous blowdown pipeline being connected with the boiler drum and the continuous blowdown expander respectively. The secondary steam pipeline is connected with one end of the continuous blowdown expander, and a throttle valve and a check valve are arranged on the secondary steam pipeline. The deaerator is connected with the other end of the secondary steam pipeline. The recycling pipeline comprises a blowdown water pipeline, a desalted water tank and a circulating water main pipe, a coil is arranged in the desalted water tank, two ends of the blowdown water pipeline are connected with one end of the coil and the continuous blowdown expander respectively, the circulating water main pipe comprises a circulating water return pipeline and a circulating water outlet pipeline, and the other end of the coil is connected with the circulating water return pipeline. The sewage purifier is arranged between the blowdown water pipeline and the desalted water tank, and a double-layer filter membrane is arranged in the sewage purifier, and at least two guide plates are arranged between the double-layer filter membrane.

2. A continuous blowdown water recycling device for a dry quenching boiler according to claim 1, characterized in that, The utility model further comprises a standby pipeline and a standby blowdown expander. The standby pipeline is connected with one end of the continuous blowdown expander, and a standby valve is arranged on the standby pipeline. The other end of the standby pipeline is connected with the standby blowdown expander.

3. A continuous blowdown water recycling device for a dry quenching boiler according to claim 2, characterized in that, The utility model further comprises a first valve and a second valve. The first valve is arranged at the blowdown water pipeline. The second valve is arranged at the outlet of the coil.

4. A continuous blowdown water recycling device for a dry quenching boiler according to claim 3, characterized in that, The continuous blowdown expander is provided with a safety valve. The double-layer filter membrane comprises a pre-filter membrane and a fine filter membrane.

5. A continuous blowdown water recycling device for a dry quenching boiler according to claim 4, characterized in that, The utility model discloses a boiler blowdown pipeline, a secondary steam pipeline, a deaerator, a recycling pipeline, a sewage purifier, a standby pipeline and a standby blowdown expander.

Images