Thermal power plant desulfurization wastewater device and recycling technology

Abstract

The invention relates to the technical field of desulfurization waste water and discloses a thermal power plant desulfurization waste water device and a recycling technology, the thermal power plant desulfurization waste water device comprises a tower body, the tower body is divided into a desulfurization cavity and a storage cavity from top to bottom, the tower body is located between the desulfurization cavity and the storage cavity and internally and externally communicated with an air inlet pipe and a desulfurization assembly; the demisting device comprises a first spraying piece, a plurality of groups of demisting plates arranged above the first spraying piece and a second spraying piece arranged above the demisting plates. The desulfurization device has the beneficial effects that limestone slurry sprayed in the desulfurization process can be in more sufficient contact with flue gas, particulate matters in a generated mixture can be more accurately filtered, so that the discharged flue gas is safer, and meanwhile, desulfurization wastewater is recycled, so that the effects of saving and environmental protection are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of desulfurization wastewater, in particular to a desulfurization wastewater device and recycling technology for a thermal power plant. Background Art

[0002] Most thermal power plants use limestone wet flue gas desulfurization technology to remove sulfur dioxide from flue gas. The boiler exhaust treated with limestone wet flue gas desulfurization technology meets environmental protection requirements and is discharged into the atmosphere.

[0003] Limestone wet flue gas desulfurization technology has a wide range of applications, mature technology, high sulfur dioxide removal efficiency, and has been widely used in the coal-fired thermal power industry. The typical process flow of limestone wet flue gas desulfurization technology is that the flue gas at the tail of the boiler passes through the original flue of the desulfurization system and enters the desulfurization absorption tower to mix and contact with the slurry in the absorption tower of countercurrent spraying. The slurry containing the desulfurizer reacts with the sulfur dioxide in the flue gas to remove the sulfur dioxide in the flue gas. After the flue gas is desulfurized, it enters the absorption tower demister to remove the slurry components carried in the flue gas, and the clean flue gas is discharged into the atmosphere through the chimney of the power plant.

[0004] Most desulfurization system demisters use baffle demisters, which use the centrifugal force and inertial force generated by the flue gas flowing inside the baffle demister to remove the slurry components carried in the flue gas and then drop them into the slurry pool of the absorber. In order to prevent the slurry from depositing and scaling on the demister blades and flow channels, affecting the demisting effect or even causing the demister to block and shut down the absorber, the demister needs to be regularly flushed with water to keep the blades and flow channels clean.

[0005] The sulfur dioxide absorbent (mostly limestone slurry) is continuously consumed during the operation of the desulfurization system and is replenished according to the on-site parameters. The reaction product of the sulfur dioxide absorbent and sulfur dioxide is mostly gypsum, which is discharged to the corresponding gypsum dehydration system through the corresponding slurry pump to finally form by-product gypsum.

[0006] Since flue gas contains a large amount of chloride and dust, excessive chloride and dust accumulated in the desulfurization slurry will inevitably affect the sulfur dioxide absorbent, that is, the limestone slurry. Excessive chloride ions will pair with calcium ions to form calcium chloride to inhibit the dissolution of limestone. On the other hand, fine dust wraps the limestone to inhibit the growth of gypsum crystals, making the desulfurization forward reaction difficult and reducing the desulfurization efficiency of the system. For this reason, a part of the slurry in the absorption tower must be discharged regularly for treatment, and the discharged part is the desulfurization wastewater. The desulfurization wastewater is treated and reused accordingly. Since the desulfurization wastewater contains a high level of metal ions and dissolved salts, the reuse system is corroded greatly during the reuse process. At present, the main reuse methods are spraying dust reduction in the coal yard, flue bypass evaporation, and concentration into salt, which are poor in economy and high in treatment costs.

[0007] In the process of mixing limestone slurry and flue gas, uneven mixing may occur, resulting in a part of the gas not being diluted by the limestone slurry at night, which will also cause certain environmental pollution. Summary of the invention

[0008] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0009] In view of the above-mentioned existing desulfurization wastewater containing high metal ions and dissolved salts, which causes great corrosion to the reuse system during the reuse process, the current main reuse methods are coal yard spraying to reduce dust, flue bypass evaporation, concentration into salt, etc., which have poor economy, high processing costs and insufficient mixing of limestone slurry and flue gas. The present invention is proposed.

[0010] The present invention aims to provide a desulfurization wastewater device for a thermal power plant, which aims to solve the problems of insufficient desulfurization process in the thermal power plant and relatively wasteful treatment method of wastewater in the desulfurization process.

[0011] In order to solve the above technical problems, the present invention provides the following technical solutions: a desulfurization wastewater device for a thermal power plant, comprising a tower body, which is divided into a desulfurization chamber and a storage chamber from top to bottom. The tower body is located between the desulfurization chamber and the storage chamber and is connected to the inside and outside by an air intake pipe. The desulfurization component acts on the inside of the tower body, and comprises a first spray component, several groups of demister plates arranged above the first spray component, and a second spray component arranged above the demister plates.

[0012] As a preferred solution of the wastewater desulfurization device for a thermal power plant of the present invention, the air inlet pipe is located below the first spraying member, and the desulfurization chamber is connected to the storage chamber.

[0013] As a preferred solution of the desulfurization wastewater device of a thermal power plant of the present invention, wherein: the desulfurization component also includes a tempering water tank arranged on the outside of the tower body, the output range of the first spray part covers the cross-section of the desulfurization chamber, and the first spray pipe part includes a first nozzle spray ring arranged inside the desulfurization chamber and a first water pumping pipe arranged on the outside of the tower body and connected.

[0014] As a preferred solution of the desulfurization wastewater device for a thermal power plant of the present invention, the input end of the first pumping pipe is connected to the storage chamber, and the output end is connected to the desulfurization chamber and cooperates with the first nozzle and the spray ring.

[0015] As a preferred solution of the desulfurization wastewater device for a thermal power plant of the present invention, a rotating groove is downwardly opened inside the output end of the first pumping pipe, and water is pumped inside the first pumping pipe by a pump.

[0016] As a preferred solution of the desulfurization wastewater device for a thermal power plant of the present invention, wherein: the first nozzle includes a flange limited by a rotating groove, a rotating shaft on the central axis, a knocking plate away from one end of the flange, and a water outlet hole opened on the axial annular surface, the rotating shaft is fixedly connected to the knocking plate, and an annular groove is opened from top to bottom on the circumferential annular surface of the rotating shaft.

[0017] As a preferred solution of the desulfurization wastewater device of a thermal power plant of the present invention, several groups of demister plates are sequentially distributed above the spray ring, several groups of through grooves are opened on the demister plates, both sides of the demister plates are inclined downward, and the through grooves are folded several times.

[0018] As a preferred solution of the thermal power plant desulfurization wastewater device of the present invention, the second spray part includes a second pumping pipe connected to the tower body to reach the desulfurization chamber, the output end of the second pumping pipe is connected to a second nozzle, and the other end is connected to the tempering water tank, and water is pumped inside the second pumping pipe by a pump.

[0019] The beneficial effects of the thermal power plant wastewater desulfurization device of the present invention are: the limestone slurry sprayed during the desulfurization process can be brought into contact with the flue gas more fully, and particulate matter can be filtered out more accurately in the generated mixture, thereby making the discharged flue gas safer.

[0020] Another object of the present invention is to provide a recycling technology, the purpose of which is to solve the problem that the treatment method of wastewater in the desulfurization process is relatively wasteful.

[0021] In order to solve the above technical problems, the present invention also provides the following technical solutions: a reuse technology, which includes a desulfurization wastewater device for a thermal power plant; and equipment cooling water, process condensate water and other water in a wet limestone flue gas desulfurization system are collected and sent to the corresponding process stage of the desulfurization wastewater treatment system to be mixed with the desulfurization wastewater and then enter the conditioning water tank. When the water quality detection unit monitors the water quality and finds it unqualified, the conditioned process water is supplemented and conditioned.

[0022] As a preferred solution of the reuse technology of the present invention, after the water quality is qualified, the water quality signal is sent to the computer processing unit. The computer processing unit draws the desulfurization wastewater in the tempering water tank through the final stage demister flushing system according to the system production needs to flush the final stage demister blades, thereby realizing the recycling of the desulfurization wastewater.

[0023] The beneficial effect of the reuse technology of the present invention is that the desulfurization wastewater can be recycled to achieve the effect of saving and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 It is a schematic diagram of the internal structure of the tower body in the present invention.

[0027] Figure 3 This is a structural detail diagram of the first nozzle in the present invention.

[0028] Figure 4 It is a detailed cross-sectional view of the demister plate in the present invention.

[0029] Figure 5 The figure is a flow chart of the desulfurization wastewater reuse technology in the present invention. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0033] Example 1

[0034] Reference Figure 1-2 , which is the first embodiment of the present invention, and provides a desulfurization wastewater device for a thermal power plant, including a tower body 100, which is divided into a desulfurization chamber 101 and a storage chamber 102 from top to bottom. The tower body 100 is located between the desulfurization chamber 101 and the storage chamber 102, and is connected to the inside and outside by an air inlet pipe 103. The desulfurization component 200 acts on the inside of the tower body 100, and includes a first spray member 201, a plurality of groups of demister plates 202 arranged above the first spray member 201, and a second spray member 203 arranged above the demister plates 202.

[0035] Furthermore, the air inlet pipe 103 is located below the first spray component 201, and the desulfurization chamber 101 is connected to the storage chamber 102. The desulfurization component 200 also includes a tempering water tank 204 arranged on the outside of the tower body 100. The first spray pipe component 201 includes a first nozzle 201a and a spray ring 201b arranged inside the desulfurization chamber 101, and a first water pumping pipe 201c arranged on the outside of the tower body 100 and connected. The input end of the first water pumping pipe 201c is connected to the storage chamber 102, and the output end is connected to the desulfurization chamber 101 and cooperates with the first nozzle 201a and the spray ring 201b.

[0036] Furthermore, a rotating groove 201c-1 is downwardly opened inside the output end of the first water pumping pipe 201c, and water is pumped inside the first water pumping pipe 201c by a pump. The first nozzle 201a includes a flange 201a-1 limited by the rotating groove 201c-1, a rotating shaft 201a-2 on the central axis, a knocking plate 201a-3 at one end away from the flange 201a-1, and a water outlet hole 201a-4 opened on the axial annular surface, and the rotating shaft 201a-2 is fixedly connected to the knocking plate 201a-3.

[0037] Specifically, the input end of the air inlet pipe 103 is connected to the place where the smoke is discharged. The smoke passes through the air inlet pipe 103 at a relatively large flow rate. At this time, since the bottom of the tower body 100 is closed, the smoke can only be discharged from the upper end of the tower body 100. In the process of smoke discharge, it will first pass through the first spray part 201. The spray ring 201b is arranged in a ring shape on the outer side of the transverse surface of the tower body 100, so that the limestone slurry sprayed by the spray ring 201b can be more fully in contact with the smoke.

[0038] Specifically, a rotating groove 201c-1 is provided at the output end of the first pumping pipe 201c, and the output end of the first pumping pipe 201c is arranged vertically downward, so that the first nozzle 201a can cover a more uniform area in the process of spraying liquid. A circle of flange 201a-1 is arranged on the first nozzle 201a and placed in the rotating groove 201c-1, so that the rotating groove 201c-1 can limit the flange 201a-1 from moving up and down, so that the flange 201a-1 can rotate in the rotating groove 201c-1. A plurality of groups of water outlet holes 201a-4 are provided on the side wall of the first nozzle 201a, and the limestone slurry is sprayed out from the water outlet holes 201a-4. A knocking plate 201a-3 is provided on the side away from the flange 201a-1, and the knocking plate 201a- A plurality of groups of protrusions are arranged on the circumferential surface of 3, which can form a dispersing effect when the ejected limestone slurry contacts the knocking plate 201a-3. The rotating shaft 201a-2 is connected to the knocking plate 201a-3, and an annular groove is opened from top to bottom on the circumferential surface of the rotating shaft 201a-2. When the limestone slurry is ejected from the water outlet 201a-4, the limestone slurry will first pass through the rotating shaft 201a-2. At this time, the annular groove opened on the circumferential surface of the rotating shaft 201a-2 will rotate when it contacts the impact of the slurry. At this time, due to the rotation of the rotating shaft 201a-2, the knocking plate 201a-3 also rotates accordingly. At this time, when the limestone slurry contacts the knocking plate 201a-3 again, it will be dispersed, thereby making the contact between the limestone slurry and the flue gas more sufficient.

[0039] Example 2

[0040] Reference Figure 1 to Figure 4 , which is the second embodiment of the present invention. Different from the previous embodiment, it also includes a plurality of groups of demister plates 202 distributed in sequence above the spray ring 201b, a plurality of groups of through grooves 202a are opened on the demister plates 202, both sides of the demister plates 202 are inclined downward, and the through grooves 202a are folded several times.

[0041] Furthermore, the second spraying element 203 includes a second pumping pipe 203a connected to the tower body 100 and reaching the desulfurization chamber 101. The output end of the second pumping pipe 203a is connected to a second nozzle 203a-1, and the other end is connected to the tempering water tank 204. Water is pumped inside the second pumping pipe 203a by a pump.

[0042] Specifically, the demister plates 202 are usually arranged in two to three groups. The demister plates 202 can be arranged according to the specific structure of the tower body 100, so that the demister plates 202 can be placed more closely inside the tower body 100 and fixed inside the tower body 100. The demister plates 202 are arranged to form an angle downward on both sides, so that the two sides of the demister plates 202 can be tilted downward. After the flue gas contacts the limestone slurry, it will carry the limestone particles. After the flue gas passes through the first spraying member 201, the limestone particles will be discharged from the through groove 202. The particles in the flue gas will pass through the demister plate 202 at 02a and be adsorbed on the demister plate 202. At this time, a large amount of chlorides and smoke dust in the flue gas will be removed. After the chlorides and smoke dust come into contact with the limestone slurry, particulate matter will be generated. The size of the particles is uncertain. Therefore, the through grooves 202a on the demister plate 202 are arranged to be folded multiple times. In this way, the particles in the flue gas can be directly adsorbed inside the through grooves 202a of the demister plate 202 due to the multiple folds during the process of passing through the through grooves 202a, and will no longer be discharged into the atmosphere with the flue gas.

[0043] Specifically, after the work is completed, the second spray piece 203 starts spraying and cleaning from the top of the defogger plate 202 downwards. Since the defogger plate 202 is arranged to form an angle downward on both sides, the two sides of the defogger plate 202 can be tilted downward. In this way, the liquid sprayed by the second spray piece 203 can slide down along the middle high point of the defogger plate 202 to both sides, thereby achieving the effect of saving water resources. In addition, such an inclination angle can make the cleaning process more convenient. Although the through groove 202a is folded and has a certain angle, due to the inclination angle of the defogger plate 202 itself, the particulate matter can be more easily cleaned out of the through groove 202a.

[0044] Example 3

[0045] Reference Figure 1 to Figure 5 , which is the third embodiment of the present invention, and further provides a recycling technology. The equipment cooling water, process condensed water and other water in the wet limestone flue gas desulfurization system are collected and sent to the corresponding process stage of the desulfurization wastewater treatment system to mix with the desulfurization wastewater and then enter the conditioning water tank. When the water quality detection unit monitors the water quality and finds that it is unqualified, the conditioning process water is supplemented and conditioned.

[0046] Furthermore, after the water quality is qualified, the water quality signal is sent to the computer processing unit. The computer processing unit draws the desulfurization wastewater in the conditioning water tank through the final stage demister flushing system to flush the final stage demister blades according to the system production needs, thereby realizing the recycling of the desulfurization wastewater.

[0047] Specifically, the first pumping pipe 201c and the second pumping pipe 203a respectively play the role of pumping water for recycling. The first pumping pipe 201c extracts liquid from the tempering water tank 204, which is used for the second spray pipe 203a to spray and clean the defogger plate 202 from the top of the tower body 100. At this time, the liquid will flow to the storage chamber 102 at the bottom of the tower body 100 for collection and storage. The second pumping pipe 203a extracts the liquid in the storage chamber 102 to spray the flue gas, thereby achieving a recycling effect.

[0048] Specifically, the specific implementation method is to use the collection box after the existing desulfurization wastewater treatment as the tempering water tank 204 for the reuse of desulfurization wastewater, send the high-quality production condensate water and equipment cooling water on site to the appropriate position of the desulfurization wastewater treatment process to supplement the desulfurization wastewater, and use instruments to monitor the water quality in the tempering water tank 204. When the water quality meets the requirements and the desulfurization operation process needs to flush the last-stage demister blades in the tower body 100, the computer-controlled last-stage demister blade flushing system is used to absorb the water in the tempering water tank 204 to flush the last-stage demister blades to achieve the recycling of desulfurization wastewater.

[0049] The equipment cooling water, process condensate water and other water in the wet limestone flue gas desulfurization system are collected and sent to the corresponding process stage of the desulfurization wastewater treatment system to be mixed with the desulfurization wastewater and then enter the conditioning water tank 204. The water quality detection unit monitors the water quality and the conditioning process water is supplemented and conditioned when it is unqualified. After the water quality is qualified, the water quality signal is sent to the computer processing unit. The computer processing unit inhales the desulfurization wastewater in the conditioning water tank 204 through the final demister flushing system according to the system production needs to flush the final demister blades, thereby realizing the recycling of desulfurization wastewater.

[0050] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0051] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A desulfurization wastewater device for a thermal power plant, characterized in that: include, The tower body (100) is divided into a desulfurization chamber (101) and a storage chamber (102) from top to bottom. The tower body (100) is located between the desulfurization chamber (101) and the storage chamber (102) and is connected to an air inlet pipe (103) inside and outside. The desulfurization component (200) acts on the inside of the tower body (100), and comprises a first spraying member (201), a plurality of groups of demister plates (202) arranged above the first spraying member (201), and a second spraying member (203) arranged above the demister plates (202).

2. The desulfurization wastewater device for a thermal power plant according to claim 1, characterized in that: The air inlet pipe (103) is located below the first spraying element (201), and the desulfurization chamber (101) is communicated with the storage chamber (102).

3. The desulfurization wastewater device for a thermal power plant according to claim 1 or 2, characterized in that: The desulfurization component (200) further includes a conditioning water tank (204) arranged outside the tower body (100); The output range of the first spray component (201) covers the cross section of the desulfurization chamber (101), and the first spray pipe component (201) comprises a first spray head (201a) and a spray ring (201b) arranged inside the desulfurization chamber (101), and a first water pumping pipe (201c) arranged outside the tower body (100) and connected thereto.

4. The desulfurization wastewater device for a thermal power plant according to claim 3, characterized in that: The input end of the first water pumping pipe (201c) is connected to the storage chamber (102), and the output end is connected to the desulfurization chamber (101) and cooperates with the first nozzle (201a) and the spray ring (201b).

5. The desulfurization wastewater device for a thermal power plant according to claim 4, characterized in that: A rotating groove (201c-1) is provided downwardly inside the output end of the first water pumping pipe (201c), and water is pumped inside the first water pumping pipe (201c) by a pump.

6. The desulfurization wastewater device for a thermal power plant according to claim 5, characterized in that: The first spray head (201a) comprises a flange (201a-1) limited by a rotating groove (201c-1), a rotating shaft (201a-2) on a central axis, a knocking plate (201a-3) at one end away from the flange (201a-1), and a water outlet hole (201a-4) provided on an axial annular surface; The rotating shaft (201a-2) is fixedly connected to the striking plate (201a-3), and an annular groove is provided on the circumferential surface of the rotating shaft (201a-2) from top to bottom.

7. The desulfurization wastewater device for a thermal power plant according to claim 6, characterized in that: A plurality of groups of demister plates (202) are sequentially distributed above the spray ring (201b), and a plurality of groups of through grooves (202a) are formed on the demister plates (202); Both sides of the demisting plate (202) are inclined downward, and the through groove (202a) is folded several times.

8. The desulfurization wastewater device for a thermal power plant according to claim 7, characterized in that: The second spraying member (203) comprises a second water pumping pipe (203a) connected to the tower body (100) and reaching the desulfurization chamber (101); the output end of the second water pumping pipe (203a) is connected to a second nozzle (203a-1), and the other end is connected to the tempering water tank (204); water is pumped inside the second water pumping pipe (203a) by a pump.

9. A recycling technology, characterized in that: It comprises the desulfurization wastewater device of a thermal power plant as described in any one of claims 1 to 8; and the equipment cooling water, process condensate water and other water in the wet limestone flue gas desulfurization system are collected and sent to the corresponding process stage of the desulfurization wastewater treatment system to be mixed with the desulfurization wastewater and then enter the tempering water tank, and the tempering process water is supplemented and tempered when the water quality detection unit monitors the water quality and finds it unqualified.

10. The recycling technology according to claim 9, characterized in that: After the water quality is qualified, the water quality signal is sent to the computer processing unit. According to the system production needs, the computer processing unit draws the desulfurization wastewater in the conditioning water tank through the final stage demister flushing system to flush the final stage demister blades to achieve the recycling of desulfurization wastewater.

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