Water removal and dust removal integrated control device for coal-fired unit after full-load wet desulphurization

Abstract

The utility model discloses an integrated control device for water removal and dust removal after full-load wet desulphurization of a coal-fired unit, which belongs to the technical field of water removal and dust removal and comprises a shell used for circulating flue gas of the coal-fired unit, and an internal rotation venturi structure, an external rotation venturi structure, a liquid drop catcher, a liquid film generator and a built-in water pipe are mounted on the inner wall of the shell. The external rotation venturi structure and the liquid drop catcher are both located above the internal rotation venturi structure, the external rotation venturi structure corresponds to the liquid drop catcher in position, the external rotation venturi structure is arranged below the liquid film generator, and a set of liquid drop catcher is also arranged above the liquid film generator. The water removal and dust removal integrated control device after full-load wet desulphurization of the coal-fired unit is simple in structure and safe in operation, and solves the problem that chimney rain, gypsum rain and outlet particulate matters are not up to the standard due to the fact that a large amount of small slurry and dust-containing particulate matters in a spraying layer enter the atmosphere along with flue gas during ultra-low-load operation.

Description

Technical Field

[0001] The utility model belongs to the technical field of water removal and dust removal, in particular to an integrated control device for water removal and dust removal after full-load wet desulfurization of a coal-fired unit. Background Art

[0002] In recent years, in order to solve the problem of wind power abandonment, the Northeast region and northwestern inland provinces, which rely heavily on thermal power peak regulation, took the lead in introducing a competition mechanism in the field of peak regulation, fully stimulating the enthusiasm for thermal power peak regulation. Then other parts of the country also started the market-oriented construction of peak regulation auxiliary services.

[0003] As the scale of grid connection of renewable energy sources such as wind power and solar power continues to increase, the instability of power system operation will be significantly enhanced. Thermal power, with its natural stability, controllability and adjustability, will be assigned more power peak-shaving tasks.

[0004] Under deep peak-shaving conditions, when operating at medium and high loads, environmental protection requirements can be met based on conventional dust and water removal technology. However, when the unit is operating at ultra-low load, the flue gas flow rate of the desulfurization system is significantly lower than that of normal operating conditions, resulting in insufficient centrifugal force for dust and mist removal of conventional products. A large amount of fine slurry and dust-containing particles in the spray layer enter the atmosphere with the flue gas, which can easily cause chimney rain, gypsum rain and substandard outlet particulate matter. It is urgent to upgrade the technology to meet environmental emission requirements. Utility Model Content

[0005] In order to solve the problem that a large amount of fine slurry and dust particles in the spray layer enter the atmosphere with the flue gas when the unit is running at ultra-low load, which easily causes chimney rain, gypsum rain and outlet particulate matter that does not meet the standards, the utility model provides an integrated control device for water and dust removal after full-load wet desulfurization of a coal-fired unit.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an integrated control device for water removal and dust removal after full-load wet flue gas desulfurization of a coal-fired unit, comprising a shell for circulating the flue gas of the coal-fired unit, the inner wall of the shell is installed with an inwardly rotating Venturi structure, an outwardly rotating Venturi structure, a droplet catcher, a liquid film generator and a built-in water pipe, the outwardly rotating Venturi structure and the droplet catcher are both located above the inwardly rotating Venturi structure, the positions of the outwardly rotating Venturi structure and the droplet catcher are arranged correspondingly, the outwardly rotating Venturi structure is arranged below the liquid film generator, and a set of droplet catchers is also arranged above the liquid film generator, and the water pipe coaxially penetrates the inwardly rotating Venturi structure, the outwardly rotating Venturi structure and the droplet catcher.

[0007] As a preferred embodiment, a nozzle is provided at a portion of the water pipe located above each of the inner rotating Venturi structure and the outer rotating Venturi structure.

[0008] As a preferred embodiment, the liquid film generator is a structure that continuously forms a turbulent liquid film with water. At ultra-low load, turbulence occurs when the flue gas passes through, the flue gas cools down rapidly, and the particulate matter serves as condensation nuclei, causing water to condense, thereby achieving the effect of removing water and dust.

[0009] As a preferred embodiment, the droplet catcher is a multi-layer conical structure.

[0010] As a preferred embodiment, the housing adopts a cylindrical structure.

[0011] As a preferred embodiment, the top end of the water pipe is located between the externally rotating Venturi structure and the liquid film generator, and the lower end of the water pipe is located below the internally rotating Venturi structure.

[0012] As a preferred embodiment, the number of the external rotating Venturi structure is set to at least one.

[0013] Compared with the prior art, the technical effects and advantages of the utility model are as follows:

[0014] The integrated control device for water and dust removal after full-load wet desulfurization of coal-fired units is used. When the coal-fired units are running at medium or high loads, the flue gas velocity is high, and the dust, large droplets and some fine droplets are mechanically removed due to the centrifugal force when passing through the inner and outer venturi structures.

[0015] The integrated control device for water removal and dust removal after full-load wet flue gas desulfurization of the coal-fired unit is used. When the coal-fired unit is operating at ultra-low load, due to the low flue gas velocity, insufficient centrifugal force is generated when the flue gas passes through the inner rotating Venturi structure and the outer rotating Venturi structure, and the dust, large droplets and some fine droplets in the flue gas cannot be mechanically removed. At this time, the liquid film generator is started, and cold water is supplied through the central water pipe to form a continuous low-temperature turbulent liquid holding layer. Turbulence occurs when the flue gas passes through, and the flue gas rapidly exchanges heat. At this time, on the one hand, the particulate matter is used as the condensation nucleus to condense the saturated water vapor in the flue gas. On the other hand, most of the fine droplets in the flue gas condense into larger particles. These particles are retained in the liquid holding layer because they cannot overcome the surface tension of water. Therefore, the concentration and water content of the particulate matter in the flue gas can be effectively reduced to achieve the effect of water removal and dust removal.

[0016] The integrated control device for water and dust removal after full-load wet desulfurization of the coal-fired unit has a multi-layer droplet catcher above the liquid film generator to prevent large droplets from escaping;

[0017] The integrated control device for water removal and dust removal after full-load wet flue gas desulfurization of the coal-fired unit has a simple structure and safe operation. It solves the problem that a large amount of fine slurry and dust particles in the spray layer enter the atmosphere with the flue gas during ultra-low load operation, which easily causes chimney rain, gypsum rain and substandard outlet particulate matter. Compared with similar equipment, the system has a high degree of system coupling, low difficulty in technical transformation, and better dust and water removal capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a cross-sectional view of the utility model.

[0020] Description of reference numerals:

[0021] In the figure: 1. Shell; 2. Water pipe; 3. Inwardly rotating Venturi structure; 4. Droplet catcher; 5. Outwardly rotating Venturi structure; 6. Liquid film generator. DETAILED DESCRIPTION

[0022] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.

[0023] Unless otherwise defined, the directions of up, down, left, right, front, back, inside and outside involved in this document are based on the directions of up, down, left, right, front, back, inside and outside in the figures shown in the present utility model, and are explained here together.

[0024] The connection method can be bonding, welding, bolt connection, etc., depending on actual needs.

[0025] Since the various structures of the present application are affected by the smoke, heat-resistant and corrosion-resistant treatments will be performed to reduce the impact of the smoke, and they will be jacked up for repair and maintenance.

[0026] See also Figure 1 As shown, this embodiment includes a shell 1 for circulating the flue gas of the coal-fired unit, and the inner wall of the shell 1 is installed with an inner rotating Venturi structure 3, an outer rotating Venturi structure 5, a droplet catcher 4, a liquid film generator 6 and a built-in water pipe 2, and the outer rotating Venturi structure 5 and the droplet catcher 4 are both located above the inner rotating Venturi structure 3. When the coal-fired unit is running at medium and high loads, the flue gas with a high flow rate enters the shell 1, and the dust, large droplets and some fine droplets are mechanically removed due to the action of centrifugal force when passing through the inner rotating Venturi structure 3 and the outer rotating Venturi structure 4.

[0027] The externally rotating Venturi structure 5 is arranged corresponding to the position of the droplet catcher 4, and a multi-layer droplet catcher 4 is arranged above the internally rotating Venturi structure 3. When the coal-fired unit is running at medium and high load, the particulate matter and large droplets in the flue gas are better collected. When the coal-fired unit is running at medium and high load, the small droplets and medium droplets in the flue gas collide to become large droplets, and the collection effect is better. The externally rotating Venturi structure 5 is arranged below the liquid film generator 6, and a set of droplet catchers 4 is also arranged above the liquid film generator 6. The water pipe 2 coaxially penetrates the internally rotating Venturi structure 3, the externally rotating Venturi structure 5 and the droplet catcher 4. The ultra-low load of the coal-fired unit During the load operation, due to the low flue gas velocity, when passing through the inner rotating Venturi structure 3 and the outer rotating Venturi structure 5, insufficient centrifugal force is generated, and dust, large droplets and some fine droplets in the flue gas cannot be mechanically removed. At this time, the liquid film generator 6 is started, and cold water is supplied through the water pipe to form a continuous low-temperature turbulent liquid holding layer. Turbulence occurs when the flue gas passes through, and the flue gas rapidly exchanges heat. At this time, on the one hand, the particulate matter is used as the condensation nucleus to condense the saturated water vapor in the flue gas. On the other hand, most of the fine droplets in the flue gas condense into larger particles. These particles are retained in the liquid holding layer because they cannot overcome the surface tension of water. Therefore, the concentration and moisture content of the particulate matter in the flue gas can be effectively reduced, and the effect of removing water and dust can be achieved.

[0028] The liquid film generator 6 is a structure that continuously forms a turbulent liquid film with water. When the load is ultra-low, turbulence occurs when the flue gas passes through, the flue gas cools down rapidly, and the particulate matter serves as condensation nuclei to condense water, thereby achieving the effect of removing water and dust. When the unit is running at an ultra-low load, turbulence occurs when the flue gas passes through the liquid holding layer, and the flue gas cools down rapidly. At this time, on the one hand, the particulate matter serves as condensation nuclei to condense the saturated water vapor in the flue gas. On the other hand, most of the fine droplets in the flue gas condense into larger particles. These particles are retained in the liquid holding layer because they cannot overcome the surface tension of water. Therefore, the concentration and moisture content of the particulate matter in the flue gas can be effectively reduced, thereby achieving the effect of removing water and dust.

[0029] The portion of the water pipe 2 located above each of the inner rotating Venturi structure 3 and the outer rotating Venturi structure 5 is provided with a nozzle, so as to wash some components and the flue gas above when necessary.

[0030] The droplet collector 4 is a multi-layer conical structure, and the housing 1 is a cylindrical structure.

[0031] The top end of the water pipe 2 is located between the externally rotating Venturi structure 5 and the liquid film generator 6 , and the lower end of the water pipe 2 is located below the internally rotating Venturi structure 3 .

[0032] The number of the externally rotating Venturi structure 5 is set to at least one. As a preferred embodiment, the number of the externally rotating Venturi structure 5 is set to two.

[0033] How it works

[0034] The integrated control device for water removal and dust removal after full-load wet flue gas desulfurization of the coal-fired unit is as follows: when the coal-fired unit is running at medium or high load, the flue gas with high flow rate enters the shell 1, and the dust, large droplets and some fine droplets therein are mechanically removed due to the centrifugal force when passing through the inner rotating venturi structure 3 and the outer rotating venturi structure 4; when the coal-fired unit is running at ultra-low load, due to the low flow rate of the flue gas, when passing through the inner rotating venturi structure 3 and the outer rotating venturi structure 5, insufficient centrifugal force is generated, and the dust and large droplets in the flue gas cannot be mechanically removed. and some fine mist droplets, at this time, the liquid film generator 6 is started, and cold water is supplied through the water pipe to form a continuous low-temperature turbulent liquid holding layer. Turbulence occurs when the flue gas passes through, and the flue gas rapidly exchanges heat. At this time, on the one hand, the particulate matter is used as the condensation nucleus to condense the saturated water vapor in the flue gas. On the other hand, most of the fine mist droplets in the flue gas are condensed into larger particles. These particles are retained in the liquid holding layer because they cannot overcome the surface tension of water. Therefore, the concentration and water content of the particulate matter in the flue gas can be effectively reduced, thereby achieving the effect of removing water and dust.

[0035] It should be noted that, in this article, relational terms such as one and two are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An integrated control device for water removal and dust removal after full-load wet flue gas desulfurization of a coal-fired unit, comprising a housing (1) for circulating flue gas of the coal-fired unit, characterized in that: The inner wall of the shell (1) is installed with an inner rotating Venturi structure (3), an outer rotating Venturi structure (5), a droplet catcher (4), a liquid film generator (6) and a built-in water pipe (2); the outer rotating Venturi structure (5) and the droplet catcher (4) are both located above the inner rotating Venturi structure (3); the outer rotating Venturi structure (5) and the droplet catcher (4) are arranged correspondingly; the outer rotating Venturi structure (5) is arranged below the liquid film generator (6); and a set of droplet catchers (4) is also arranged above the liquid film generator (6); the water pipe (2) coaxially penetrates the inner rotating Venturi structure (3), the outer rotating Venturi structure (5) and the droplet catcher (4).

2. The integrated control device for water removal and dust removal after full-load wet desulfurization of a coal-fired unit according to claim 1 is characterized in that: The portion of the water pipe (2) located above each of the inner rotating Venturi structure (3) and the outer rotating Venturi structure (5) is provided with a nozzle.

3. The integrated control device for water removal and dust removal after full-load wet desulfurization of a coal-fired unit according to claim 1 is characterized in that: The liquid film generator (6) is a structure that continuously forms a turbulent liquid film with water. When the flue gas passes through the generator at an ultra-low load, turbulence occurs, the flue gas is rapidly cooled, and the particulate matter serves as condensation nuclei, causing water to condense, thereby achieving the effect of removing water and dust.

4. The integrated control device for water removal and dust removal after full-load wet desulfurization of a coal-fired unit according to claim 1 is characterized in that: The droplet collector (4) is a multi-layer conical structure.

5. The integrated control device for water removal and dust removal after full-load wet desulfurization of a coal-fired unit according to claim 1 is characterized in that: The housing (1) has a cylindrical structure.

6. The integrated control device for water removal and dust removal after full-load wet desulfurization of a coal-fired unit according to claim 1 is characterized in that: The top end of the water pipe (2) is located between the externally rotating Venturi structure (5) and the liquid film generator (6), and the lower end of the water pipe (2) is located below the internally rotating Venturi structure (3).

7. The integrated control device for water removal and dust removal after full-load wet desulfurization of a coal-fired unit according to claim 6, characterized in that: The number of the outward rotating Venturi structure (5) is set to be at least one.

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