Boiler blowdown recovery system

Abstract

The utility model provides a boiler blowdown recovery system which comprises a boiler drum, a separation unit, a flue gas white removal device, a softened water processor, a desalting water tank and a deaerator, the separation unit comprises a continuous blowdown flash tank and a fixed blowdown flash tank, the continuous blowdown flash tank is communicated with the boiler drum through a continuous blowdown pipeline, and the fixed blowdown flash tank is communicated with the boiler drum through a fixed blowdown pipeline. The periodic blowdown flash tank is communicated with the boiler drum through a periodic blowdown pipeline; the periodic blowdown flash tank is communicated with a heat exchanger of the flue gas white smoke removal device through a first steam pipeline, and the flue gas white smoke removal device is communicated with the demineralized water tank through a water return pipeline; the periodic blowdown flash tank is communicated with the softened water treater through a first water conveying pipeline, the softened water treater is communicated with the demineralized water tank through a second water conveying pipeline, the demineralized water tank is communicated with the deaerator through a third water conveying pipeline, and the deaerator is communicated with the boiler drum through a fourth water conveying pipeline. According to the utility model, the flue gas de-whitening device, the softened water treater and the demineralized water tank are additionally arranged between the boiler drum and the deaerator, so that efficient recovery of heat energy and water resources is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to a boiler blowdown recovery technical field, especially a boiler blowdown recovery system. BACKGROUND

[0002] In the process of boiler operation and maintenance, continuous blowdown and periodic blowdown are usually used to realize the blowdown treatment of the circulating water system, and part of the boiler blowdown system directly discharges the continuous blowdown and the periodic blowdown to the environment, resulting in serious waste of heat energy and water resources. Therefore, the recovery technology of heat energy and water resources in the process of boiler blowdown treatment is concerned.

[0003] At present, the steam and high-temperature water in the boiler blowdown are usually separated by an expander, specifically, the high-pressure steam is introduced into the deaerator for heating and deaeration, and the high-temperature water is directly discharged into a ditch. In order to avoid the waste of heat energy and water resources caused by the direct discharge of high-temperature water into the ditch, a plate heat exchanger is usually used for heat recovery. In addition, for the high-temperature water discharged into the ditch, it is usually first discharged to a sewage treatment station to be treated into softened water, and then returned to the deaerator for heating and deaeration, and finally added to the boiler circulating water system by the feed water pump for recycling.

[0004] However, in actual use, the deaerator recovers and processes the high-pressure steam in the process of continuous blowdown and periodic blowdown at the same time. Since the discharge amount of the saturated steam recovered at one time in the periodic blowdown is large, it is easy to cause the working condition of the deaerator to be unstable, which is not conducive to the stable operation of the recovery system. The heat exchange effect of the plate heat exchanger is limited, so that most of the heat energy in the high-temperature water is finally discharged into the ditch in the form of sewage, and the heat energy recovery rate of the high-temperature water is not high. In addition, the sewage contains a large amount of pollutants, which is easy to cause deposition and blockage in the plate heat exchanger, reducing the service life of the equipment. The sewage treatment station needs to treat a large amount of precipitates and metal ions such as calcium and magnesium in hard water, resulting in a large treatment pressure of the sewage treatment station and a high treatment cost. Therefore, it is urgent to develop a new boiler blowdown recovery system. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model aims to provide a boiler blowdown recovery system, which solves the technical problems in the prior art that the discharge amount of the saturated steam recovered at one time in the periodic blowdown is large, which is easy to cause the working condition of the deaerator to be unstable, which is not conducive to the stable operation of the recovery system; the heat exchange effect of the plate heat exchanger is limited, and the heat energy recovery rate of the high-temperature water is not high; and the pressure of the sewage treatment station on the high-temperature water discharged into the ditch is large, and the treatment cost is high.

[0006] The utility model discloses a boiler blowdown recovery system, including boiler drum, separation unit, flue gas white removal device, softened water treater, desalted water tank and deaerator, the separation unit includes the extension of the container and fixed extension of the container, the extension of the container is passed through the extension pipeline with boiler drum intercommunication, the fixed extension of the container is passed through fixed pipeline with boiler drum intercommunication,

[0007] Wherein, the fixed extension of the container is passed through first steam pipeline with the heat exchanger intercommunication of flue gas white removal device to carry out heat exchange, and the outlet end of flue gas white removal device is passed through backwater pipeline with desalted water tank intercommunication;

[0008] The fixed extension of the container is still passed through first water pipeline with the water inlet of softened water treater intercommunication, and the water outlet of softened water treater is passed through second water pipeline with desalted water tank intercommunication, and desalted water tank is passed through third water pipeline with deaerator intercommunication, and deaerator is passed through fourth water pipeline with boiler drum intercommunication.

[0009] Compared with the prior art, the boiler blowdown recovery system of the utility model has the beneficial effects that: by adding a flue gas white removal device between the boiler drum and the deaerator, efficient recovery of heat energy is achieved, and the problem of unstable operation of the deaerator caused by the direct entry of saturated steam in the fixed extension of the container into the deaerator in the prior art is avoided, effectively ensuring stable operation of the entire boiler blowdown recovery system, and the treatment of high-temperature water is carried out by setting a softened water treater and a desalted water tank, and the treated water can meet the water quality requirements for circulating use in the boiler drum, achieving efficient recovery of water resources.

[0010] In addition, the boiler blowdown recovery system according to the utility model has the following additional technical features:

[0011] Further, the top of the extension of the container is connected to the deaerator through a second steam pipeline, and the bottom of the extension of the container is connected to the fixed extension of the container through a fifth water pipeline.

[0012] Further, the deaerator is also connected to a low-pressure steam pipeline, which is used to input low-pressure steam into the deaerator.

[0013] Further, the desalted water tank is also connected to a softened water supplement pipeline, which is used to supplement softened water into the desalted water tank.

[0014] Further, the softened water treater is also connected to a dirt discharge pipeline for discharging dirt in the softened water treater.

[0015] Further, the continuous row pipe, the fixed row pipe, the first steam pipe, the backwater pipe, the second steam pipe, the first water conveying pipe, the second water conveying pipe, the third water conveying pipe, the fourth water conveying pipe, the fifth water conveying pipe and the dirt discharging pipe are respectively provided with control valves.

[0016] Further, the softening water processor comprises a pump body, a sedimentation tank, a reaction tank and a pH adjusting tank which are sequentially communicated through pipes, the water inlet of the pump body is communicated with the fixed row expander through the first water conveying pipe, and the water outlet of the pH adjusting tank is communicated with the desalted water tank through the second water conveying pipe.

[0017] Further, the inside of the sedimentation tank is provided with a plurality of partitions, and S-shaped channels are formed between the plurality of partitions.

[0018] Further, the reaction tank is provided with a stirring device.

[0019] Further, the softening water processor further comprises a medicament tank which is communicated with the reaction tank through a pipe, so as to add a softening agent into the reaction tank.

[0020] The pipes for communicating the sedimentation tank with the reaction tank, for communicating the reaction tank with the pH adjusting tank and for communicating the medicament tank with the reaction tank are respectively provided with control valves. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 It is a structural schematic view of the boiler blowdown recovery system of the utility model.

[0022] Fig. 2 It is a structural schematic view of the softening water processor in the boiler blowdown recovery system of the utility model.

[0023] The above drawings comprise the following reference signs: 1-boiler drum; 2-continuous row expander; 3-fixed row expander; 4-softening water processor; 41-pump body; 42-sedimentation tank; 421-partition; 43-reaction tank; 431-stirring device; 44-pH adjusting tank; 45-medicament tank; 46-control valve; 5-oxygen remover; 6-desalted water tank; 7-flue gas white removal device; 101-continuous row pipe; 102-fixed row pipe; 201-first steam pipe; 202-backwater pipe; 203-second steam pipe; 301-first water conveying pipe; 302-second water conveying pipe; 303-third water conveying pipe; 304-fourth water conveying pipe; 305-fifth water conveying pipe; 401-dirt discharging pipe; 501-low pressure steam pipe; 601-softening water supplement pipe.

[0024] The following detailed description will further explain the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0025] For the purpose of facilitating the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The drawings show several embodiments of the present application. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0026] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein only for the purpose of describing specific embodiments of the present application and is not intended to limit the present application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] Please refer to Figs. 1-2 , it is a kind of boiler blowdown recovery system provided by the present application, including boiler drum 1, separation unit, flue gas white removal device 7, softening water processor 4, desalted water tank 6 and deaerator 5, separation unit includes continuous discharge expander 2 and fixed discharge expander 3, continuous discharge expander 2 is communicated with boiler drum 1 by continuous discharge pipeline 101, fixed discharge expander 3 is communicated with boiler drum 1 by fixed discharge pipeline 102.

[0029] Specifically, the constant-discharge flash tank 3 is communicated with the heat exchanger in the flue gas de-whitening device 7 through the first steam pipeline 201 to exchange heat, and the outlet end of the flue gas de-whitening device 7 is communicated with the desalted water tank 6 through the backwater pipeline 202. In the embodiment, the constant-discharge flash tank 3 is also communicated with the water inlet of the softened water processor 4 through the first water pipeline 301, the water outlet of the softened water processor 4 is communicated with the desalted water tank 6 through the second water pipeline 302, the desalted water tank 6 is communicated with the deaerator 5 through the third water pipeline 303, and the deaerator 5 is communicated with the boiler drum 1 through the fourth water pipeline 304. In actual use, the saturated steam in the constant-discharge flash tank 3 enters the flue gas de-whitening device 7 through the first steam pipeline 201 to heat the flue gas de-whitening device 7. It should be understood that the arrangement of the flue gas de-whitening device 7 not only enables effective use of the heat energy in the saturated steam, but also effectively reduces the saturation degree of the steam. The water treated by the flue gas de-whitening device 7 enters the desalted water tank 6 through the backwater pipeline 202 to remove impurities and salts, and then enters the deaerator 5 to be heated and deaerated, thereby avoiding the problem of unstable working condition of the deaerator 5 caused by the direct entry of high-saturation steam into the deaerator 5 in the prior art. The water separated in the constant-discharge flash tank 3 enters the softened water processor 4 through the first water pipeline 301 to be softened, and then enters the desalted water tank 6 through the second water pipeline 302. The water in the desalted water tank 6 enters the deaerator 5 through the third water pipeline 303, and finally enters the boiler drum 1 through the fourth water pipeline 304, to achieve the purpose of water replenishment for the boiler drum 1.

[0030] In the embodiment, the top of the continuous-discharge flash tank 2 is communicated with the deaerator 5 through the second steam pipeline 203, and the bottom of the continuous-discharge flash tank 2 is communicated with the constant-discharge flash tank 3 through the fifth water pipeline 305. In actual use, the continuous-discharge flash tank 2 separates steam from high-temperature water, the separated steam enters the deaerator 5 through the second steam pipeline 203 to heat the deaerated circulating water, and the separated high-temperature water enters the constant-discharge flash tank 3 through the fifth water pipeline 305 to be further flashed.

[0031] Further, the deaerator 5 is also connected with a low-pressure steam pipeline 501, which is used to input low-pressure steam treated by the boiler blowdown recovery system of the present application into the deaerator 5 to heat the deaerated circulating water in the deaerator 5 and improve the deaeration efficiency.

[0032] Further, the desalted water tank 6 is also connected with a softened water supplement pipeline 601, which is used to supplement softened water into the desalted water tank 6.

[0033] Further, the softening water processor 4 is further connected with a dirt discharging pipeline 401 for discharging dirt in the softening water processor 4, in actual use, the dirt in the softening water processor 4 is discharged to a ditch and transported to a treatment station for treatment through the dirt discharging pipeline 401. In the embodiment, the continuous discharging pipeline 101, the constant discharging pipeline 102, the first steam pipeline 201, the backwater pipeline 202, the second steam pipeline 203, the first water conveying pipeline 301, the second water conveying pipeline 302, the third water conveying pipeline 303, the fourth water conveying pipeline 304, the fifth water conveying pipeline 305 and the dirt discharging pipeline 401 are respectively provided with control valves for controlling the opening or closing of each pipeline.

[0034] As an example, the softening water processor 4 comprises a pump body 41, a sedimentation tank 42, a reaction tank 43 and a pH adjusting tank 44 which are sequentially communicated through pipelines, the water inlet of the pump body 41 is communicated with the constant discharging expander 3 through the first water conveying pipeline 301, and the water outlet of the pH adjusting tank 44 is communicated with the desalted water tank 6 through the second water conveying pipeline 302. The inside of the sedimentation tank 42 is provided with a plurality of partitions 421, the plurality of partitions 421 are alternately arranged in the inside of the sedimentation tank 42, in other words, S-shaped channels are formed between the plurality of partitions 421, which is beneficial to the settlement of solid particles and sediments.

[0035] Further, the reaction tank 43 is provided with a stirring device 431 to make the softening agent added into the reaction tank 43 fully mix with the sewage water. Further, the softening water processor 4 further comprises a medicament tank 45 which is communicated with the reaction tank 43 through a pipeline to add the softening agent into the reaction tank 43, and the common softening agent includes sodium chloride, sodium hydroxide and the like. The pipelines for communicating the sedimentation tank 42 with the reaction tank 43, for communicating the reaction tank 43 with the pH adjusting tank 44 and for communicating the medicament tank 45 with the reaction tank 43 are respectively provided with control valves 46 to control the conduction or closing of the pipelines. In actual use, the sewage water separated from the fixed discharge expander 3 is discharged into the sedimentation tank 42 through the first water pipeline 301 and the pump body 41 to perform the preliminary filtration and sedimentation treatment to remove the solid particles and the sediment in the sewage water. Then, the sewage water after the sedimentation in the sedimentation tank 42 is introduced into the reaction tank 43 through the pipeline, and the softening agent is added into the sewage water in the reaction tank 43 through the medicament tank 45. The softening agent can chemically react with the calcium ions, magnesium ions and the like in the sewage water to form the sediment or the soluble salt, thereby reducing the hardness of the sewage water. Under the action of the stirring device 431, the softening agent and the sewage water are fully mixed, so that the softening agent can fully react with the calcium ions, magnesium ions and the like in the sewage water. After the softening agent reacts with the calcium ions, magnesium ions and the like in the sewage water to form the sediment or the soluble salt, the sediment can be separated from the water through the sedimentation or filtration method, thereby achieving the purpose of softening the water quality. Finally, according to the water quality after the softening, the pH value of the water can be further adjusted in the pH adjusting tank 44 to ensure that the water quality after the softening meets the use requirements.

[0036] In summary, the boiler blowdown recovery system has the following advantages: the flue gas white removal device is arranged between the boiler drum and the deaerator, the efficient recovery of heat energy is realized, the problem of unstable working condition of the deaerator caused by the direct entry of the saturated steam in the fixed discharge expander into the deaerator in the prior art is avoided, the stable operation of the entire boiler blowdown recovery system is effectively ensured, the high-temperature water is treated by the softening water processor and the desalted water tank, the treated water can meet the water quality requirements for being transported to the boiler drum for recycling, and the efficient recovery of water resources is realized.

[0037] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean 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.

[0038] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A boiler blowdown recovery system characterized by, The system comprises a boiler drum, a separation unit, a flue gas de-whitening device, a softened water processor, a demineralized water tank and an oxygen remover, the separation unit comprises a continuous discharge expander and a fixed discharge expander, the continuous discharge expander is communicated with the boiler drum through a continuous discharge pipeline, and the fixed discharge expander is communicated with the boiler drum through a fixed discharge pipeline; The fixed discharge expander is communicated with a heat exchanger of the flue gas de-whitening device through a first steam pipeline to perform heat exchange, and an outlet end of the flue gas de-whitening device is communicated with the demineralized water tank through a backwater pipeline; The fixed discharge expander is also communicated with a water inlet of the softened water processor through a first water pipeline, a water outlet of the softened water processor is communicated with the demineralized water tank through a second water pipeline, the demineralized water tank is communicated with the oxygen remover through a third water pipeline, and the oxygen remover is communicated with the boiler drum through a fourth water pipeline.

2. The boiler blowdown recovery system of claim 1, wherein, A top of the continuous discharge expander is communicated with the oxygen remover through a second steam pipeline, and a bottom of the continuous discharge expander is communicated with the fixed discharge expander through a fifth water pipeline.

3. The boiler blowdown recovery system of claim 1, wherein, A low-pressure steam pipeline is further connected to the oxygen remover, and the low-pressure steam pipeline is used for inputting low-pressure steam into the oxygen remover.

4. The boiler blowdown recovery system of claim 1, wherein, A softened water supplement pipeline is further connected to the demineralized water tank, and the softened water supplement pipeline is used for supplementing softened water into the demineralized water tank.

5. The boiler blowdown recovery system of claim 2, wherein, A dirt discharge pipeline is further connected to the softened water processor, and the dirt discharge pipeline is used for discharging dirt in the softened water processor.

6. The boiler blowdown recovery system of claim 5, wherein, Control valves are respectively arranged on the continuous discharge pipeline, the fixed discharge pipeline, the first steam pipeline, the backwater pipeline, the second steam pipeline, the first water pipeline, the second water pipeline, the third water pipeline, the fourth water pipeline, the fifth water pipeline and the dirt discharge pipeline.

7. The boiler blowdown recovery system of claim 1, wherein, The softened water processor comprises a pump body, a sedimentation tank, a reaction tank and a pH adjusting tank which are sequentially communicated through pipelines, a water inlet of the pump body is communicated with the fixed discharge expander through the first water pipeline, and a water outlet of the pH adjusting tank is communicated with the demineralized water tank through the second water pipeline.

8. The boiler blowdown recovery system of claim 7, wherein, A plurality of partitions are arranged in the sedimentation tank at intervals, and S-shaped channels are formed between the partitions.

9. The boiler blowdown recovery system of claim 7, wherein, A stirring device is arranged in the reaction tank.

10. The boiler blowdown recovery system of claim 7, wherein, The softened water processor further comprises a medicament tank which is communicated with the reaction tank through a pipeline to add a softening agent into the reaction tank. Control valves are respectively arranged on the pipelines for communicating the sedimentation tank with the reaction tank, for communicating the reaction tank with the pH adjusting tank and for communicating the medicament tank with the reaction tank.

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