CN219701372U - Mechanical coagulation centrifugal diversion dust removal defogging device - Google Patents

Abstract

The utility model relates to the technical field of flue gas purification after wet desulfurization of a thermal power deep peak shaving unit, in particular to a mechanical coagulation centrifugal diversion dust removal demisting device, which comprises a barrel, wherein the bottom end of the barrel is a flue gas inlet, the top end of the barrel is a flue gas outlet, a centrifugal diversion impeller assembly is arranged at the upper part in the barrel, and a plurality of mechanical coagulation structures are arranged in the barrel and below the centrifugal diversion impeller assembly at intervals from top to bottom; the mechanical coagulation structure comprises a large guide ring and a small guide ring which are arranged at an upper-lower interval, wherein the outer wall of the upper end of the large guide ring is fixedly connected with the inner wall of the cylinder in a sealing way, and the upper end of the small guide ring is arranged at an interval with the inner wall of the cylinder. The utility model has the advantages that the diversion collision is high-efficiency condensed, and the possibility of capturing fine liquid drops and particulate matters is increased; the impeller accelerates centrifugal interception, so that the collection rate of the large liquid drops after being solidified is increased; compact structure and easy combination.

Description

Mechanical coagulation centrifugal diversion dust removal defogging device

Technical Field

The utility model relates to the technical field of flue gas purification after wet desulfurization of a thermal power deep peak shaving unit, in particular to a mechanical condensation centrifugal diversion dust removal demisting device.

Background

Wind-solar intermittent fluctuation characteristics and the new energy installation bring about the difficult problem of digestion. Compared with the traditional fossil energy, wind power and photovoltaic have the characteristics of intermittence, volatility and larger weather dependence, have harm to safe and stable operation of a power grid, and can be solved by no technology at present. When the new energy power generation amount duty ratio reaches a certain degree, the curve difference of the power supply and the load can cause impact on the safety and the stability of the power grid or cause a large amount of wind and light discarding phenomenon. The new energy consumption foundation of China is weak, the new energy grid connection simultaneously causes the problems of a power source side and a power grid side, and the problems of insufficient capacity sufficiency, insufficient system flexibility and the like in the load peak period can be caused. It was estimated by the Danish energy agency that for a power system with a wind installed capacity exceeding 5GW, a change in wind speed of 1m/s may result in an installed change in power generation exceeding 500 MW. Thus, if the power system is not flexible enough, such large power generation changes may result in wind abandonment, grid congestion and unbalance.

The power system is obviously changed in the new scene, and the difficulty of balancing the power supply and demand is increased. The new scene has the typical characteristics of rich new energy types, relatively high access occupation of renewable energy sources, relatively high uncertainty of the system and the like. The original load curve in the old scene is stable, the flexibility adjusting capability can completely support the flexibility requirement of the power system, and in the new scene, the power system mainly changes at four points: 1) Compared with the original load curve, the peak-valley difference and the volatility of the net load curve in the new scene are greatly improved; 2) Along with the improvement of the renewable energy source access proportion, the flexibility requirement of the power system is greatly increased; 3) The renewable energy replaces the traditional power supply, so that the capacity of the conventional flexible resources is greatly reduced; 4) The traditional power supply and demand balancing mode can not realize the full-time-period envelope of the net load any more, and the phenomenon of flexible resource supply and demand begins to appear in the power system in part of time periods.

Under the background of deep peak regulation, the thermal power generating unit faces an ultralow-load operation condition, and the operation problems brought by the deep peak regulation are not only the main machine measurement and the denitration measurement, but also the deep purification process of flue gas particles and fog drops after wet desulfurization is affected. The existing deep dedusting and demisting device at the rear end of wet desulphurization of thermal power has large holding capacity, in particular to a tube bundle type dedusting and demisting device based on mechanical dedusting and water film dedusting principles, a plate type demisting device and a ridge type demisting device. When the unit is operated under low load, the mechanical defogging device is insufficient in separation flow velocity, so that the collision strength of particulate matters and a liquid film can be greatly reduced, and the overall dedusting defogging efficiency is reduced.

The technical problem that a practitioner must solve is faced with the new industry characteristics and the conventional requirement of how to ensure that the constant discharge concentration is lower than 5mg/Nm3 for particulate matters and fog drops under the ultra-low flow rate.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a mechanical coagulation centrifugal diversion dust removal demisting device which is used for deep purification of tail flue gas of a wet desulfurization absorption tower of a thermal power deep peak shaver set.

The technical scheme for solving the technical problems is as follows: the mechanical coagulation centrifugal flow-guiding dust-removing demisting device comprises a cylindrical barrel which is vertically arranged, wherein the bottom end of the barrel is a smoke inlet, the top end of the barrel is a smoke outlet, a centrifugal flow-guiding impeller assembly which is used for guiding smoke entering from the smoke inlet to the smoke outlet is arranged at the upper part in the barrel, and a plurality of mechanical coagulation structures are arranged in the barrel and below the centrifugal flow-guiding impeller assembly at intervals from top to bottom; the mechanical coagulation structure comprises a large guide ring and a small guide ring which are arranged at an upper-lower interval, the large guide ring and the small guide ring are funnel-shaped structures with large upper parts and small lower parts, the outer wall of the upper end of the large guide ring is fixedly connected with the inner wall of the cylinder in a sealing manner, and the upper end of the small guide ring is arranged at an interval with the inner wall of the cylinder.

On the basis of the technical scheme, the utility model can be improved as follows.

Further, the centrifugal impeller assembly comprises a plurality of separation blades which are circumferentially arranged in an array manner, and the separation blades are fixed on the inner wall of the cylinder.

Further, the separation blade is fixedly connected with the inner wall of the cylinder body through welding.

Further, the bottom end diameter of the large guide ring is equal to the bottom end diameter of the small guide ring and smaller than the top diameter of the small guide ring.

Further, the small guide ring is fixedly connected with the large guide ring through a plurality of uniformly arranged connecting rods.

Further, the outer wall of the small guide ring is fixedly connected with the inner wall of the cylinder body through a connecting piece.

Further, the top periphery of the large guide ring is fixedly connected with the inner wall of the cylinder body through full welding.

The beneficial effects of the utility model are as follows:

1. the diversion collision is high-efficiency condensed. In the deep purification of flue gas particles at the rear end of wet desulfurization, the core difficulty is the escape of fine particles and liquid drops. The small particles and liquid drops have small particle size, light weight, small inertia force action and unobvious mechanical property performance, so that the small particles and liquid drops are difficult to be trapped by a conventional dust and mist removing device. According to the mechanical condensation device, the cooperation of the two-stage guide rings is utilized to guide dust-containing fog-drop smoke to automatically collide in a fog-drop high-concentration area, fine liquid drops and particles collide in a large-angle manner in a concentration area above the small guide rings, so that the surface tension of a liquid film can be effectively broken through between the small liquid drops and the liquid drops and between the particles and the liquid drops to be condensed and agglomerated, and the rear surface becomes larger liquid drops containing the particles which are easier to trap, so that the possibility of trapping the particles is integrally increased.

2. The impeller accelerates the centrifugal interception. And (3) utilizing a special cyclone impeller design to accelerate the flue gas containing the large condensed liquid drops in an outward cyclone way. After centrifugal acceleration, the dust-containing flue gas will make an adherence spiral rising motion. In the process, the coagulated large liquid drops tend to move towards the inner wall of the cylinder under the action of inertia force, are intercepted and trapped by a liquid film on the inner wall of the cylinder after collision, and finally flow back into the slurry pool of the absorption tower.

3. Compact structure and easy combination. The structure is compact, the core structure is divided into a mechanical condensation section and a centrifugal diversion interception section, and the two sections are connected in series to perform combined work. The two-section structure has small requirement on installation height and compact structure, and can be respectively reinforced or combined and reinforced under different working conditions and different dedusting and demisting requirements. In the application design in the absorption tower, the recombination and the series connection work of two-section components can be carried out at different positions according to different tower types and different tower heights. The compact design of the integral dedusting and demisting device is beneficial to the combined application of the integral dedusting and demisting device under different requirements.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present utility model;

FIG. 2 is a schematic diagram of flue gas diversion in the present utility model;

in the drawings, the list of components represented by the various numbers is as follows:

1. a cylinder; 2. a centrifugal inducer assembly; 3. a mechanically fused structure; 4. a flue gas inlet; 5. a flue gas outlet; 6. a large guide ring; 7. a small guide ring; 8. separating the blades; 9. an inner flow passage; 10. an outer flow passage; 11. and (5) connecting a rod.

Detailed Description

The principles and features of the present utility model are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the utility model and are not to be construed as limiting the scope of the utility model.

As shown in fig. 1, the embodiment of the utility model comprises a cylindrical barrel 1 which is vertically arranged, wherein the bottom end of the barrel 1 is provided with a flue gas inlet 4, the top end of the barrel 1 is provided with a flue gas outlet 5, the upper part in the barrel 1 is provided with a centrifugal guide impeller 2 for guiding flue gas entering from the flue gas inlet 4 to the flue gas outlet 5, and a plurality of mechanical condensation structures 3 are arranged in the barrel 1 from top to bottom at intervals below the centrifugal guide impeller 2; the mechanical coagulation structure 3 comprises a large guide ring 6 and a small guide ring 7 which are arranged at an upper-lower interval, the large guide ring 6 and the small guide ring 7 are of funnel-shaped structures with large upper parts and small lower parts, the outer wall of the upper end of the large guide ring 6 is fixedly connected with the inner wall of the cylinder body 1 in a sealing manner, and the upper end of the small guide ring 7 is arranged with the inner wall of the cylinder body 1 at an interval.

In the embodiment of the utility model, the large deflector ring 6 is arranged above the small deflector ring 7. The diameter of the upper end of the large guide ring 6 = the inner diameter of the cylinder 1 > the diameter of the upper end of the small guide ring 6 = the diameter of the lower end of the large guide ring 6 = the diameter of the lower end of the small guide ring 7, the large guide ring 6 and the cylinder 1 are fixed by full welding, and the small guide ring 7 and the large guide ring 6 are connected and fixed by a plurality of connecting rods 11. The small guide ring 7 divides the flue gas flow field passing through it into an inner flow channel 9 and an outer flow channel 10.

The mechanical coagulation centrifugal diversion dust removal defogging device is arranged at the upper part of the wet desulfurization absorption tower, and the top layer is arranged above the spraying layer. As shown in figure 2, the diameter of the single circular tube type mechanical condensation centrifugal flow-guiding dust-removing demisting device is 500mm, the circular tube type mechanical condensation centrifugal flow-guiding dust-removing demisting device is vertically installed, the flue gas inlet 4 at the lower end faces towards the flue gas, the flue gas outlet 5 at the upper end faces towards the flue gas, the plurality of mechanical condensation centrifugal flow-guiding dust-removing demisting devices are installed side by side to form a dust-removing demisting layer, and gaps among the circular cross-section mechanical condensation centrifugal flow-guiding dust-removing demisting devices are sealed by sealing plates, so that all uplink flue gas can only pass through the inside of each single condensation centrifugal flow-guiding dust-removing demisting device. The flue gas passing through the wet desulfurization spray layer is mixed with fine particles which enter the tower from the inlet of the absorption tower and are not trapped by the spray layer, and fine liquid drops sprayed out of the spray layer enter the mechanical coagulation centrifugal diversion dust removal demisting device along with the upward flue gas. Firstly, the flow passes through the small guide ring 7, and is divided into two flow passages at the small guide ring 7, namely an inner flow passage 9 of the inner ring of the small guide ring 7 and an outer flow passage 10 of the outer ring of the small guide ring 7. The smoke of the inner runner 9 directly goes upward, and the smoke of the outer runner 10 is led by the large guide ring 6 to bend and then obliquely returns to the inner runner 9 again. At this time, the flue gas of the inner flow channel 9 and the flue gas of the outer flow channel 10 are converged and collided above the small guide ring 7, at this time, the density of particles and fog drops in the flue gas in the space above the small guide ring 7 is high, the flow speed is high, and the particles and the liquid drops can be forced to break through the surface tension of a liquid film between the particles and the liquid drops, and the particles and the liquid drops are condensed into large liquid drops. At this time, the whole smoke wrapped with the large liquid drops passes through the mechanical condensation structure 3 and continues to ascend.

When the flue gas continues to ascend, the flue gas passes through the centrifugal guide impeller 2. The diameter of the inner cylinder of the single centrifugal guide impeller 2 is 150mm, the inner cylinder is subjected to blind plate blocking treatment, and 12 separation blades 8 are arranged between the inner cylinder and the inner wall of the cylinder body 1. The flue gas goes upward and accelerates through the gaps between the separating blades 8. The flue gas is centrifugally guided and outwards rotated and flows towards the inside of the cylinder body 1. At this time, large liquid drops wrapped in the flue gas collide with the inner wall of the cylinder body 1, and the large liquid drops formed by condensation have larger collision kinetic energy than small liquid drops at the same speed, so that the surface tension of a liquid film of the large liquid drops is broken through again more easily, and the inner wall of the inner cylinder body 1 is intercepted, or the large liquid drops are intercepted by the liquid film attached to the inner wall of the cylinder body 1. The dust-containing liquid drops enriched on the inner wall of the cylinder body 1 are finally converged into a flow, and flow back into the slurry pool of the desulfurization absorption tower.

In the description of the present utility model, it should be understood that the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "inner", "outer", "peripheral side", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the system or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the utility model are intended to be included within the scope of the utility model.

Claims (7)

1. The mechanical coagulation centrifugal flow-guiding dust-removing demisting device is characterized by comprising a cylindrical barrel body (1) which is vertically arranged, wherein the bottom end of the barrel body (1) is provided with a smoke inlet (4), the top end of the barrel body (1) is provided with a smoke outlet (5), the upper part in the barrel body (1) is provided with a centrifugal flow-guiding impeller (2) component which is used for guiding smoke entering from the smoke inlet (4) to the smoke outlet (5), and a plurality of mechanical coagulation structures (3) are arranged in the barrel body (1) and below the centrifugal flow-guiding impeller (2) component at intervals from top to bottom; the mechanical coagulation structure (3) comprises a large guide ring (6) and a small guide ring (7) which are arranged at an upper-lower interval, the large guide ring (6) and the small guide ring (7) are of funnel-shaped structures with large upper parts and small lower parts, the outer wall of the upper end of the large guide ring (6) is fixedly connected with the inner wall of the cylinder body (1) in a sealing mode, and the upper end of the small guide ring (7) is arranged with the inner wall of the cylinder body (1) at an interval.

2. The mechanical coagulation centrifugal flow-guiding dust-removing demisting device according to claim 1, wherein the centrifugal flow-guiding impeller (2) assembly comprises a plurality of separation blades (8) arranged in a circumferential array, and the separation blades are fixed on the inner wall of the cylinder (1).

3. A mechanical coagulation centrifugal flow-guiding dust-removing demisting device according to claim 2, characterized in that the separating blades are fixedly connected with the inner wall of the cylinder (1) by welding.

4. A mechanical coagulation centrifugal flow-guiding dust-removing demisting device according to claim 1, characterized in that the bottom end diameter of the large flow-guiding ring (6) is equal to the bottom end diameter of the small flow-guiding ring (7) and smaller than the top diameter of the small flow-guiding ring (7).

5. A mechanical coagulation centrifugal flow-guiding dust-removing mist-removing device according to any one of the claims 1 to 4, characterized in that the small flow-guiding ring (7) is fixedly connected with the large flow-guiding ring (6) by means of a plurality of evenly arranged connecting rods (11).

6. A mechanical coagulation centrifugal flow-guiding dust-removing mist-removing device according to any one of the claims 1 to 4, characterized in that the outer wall of the small flow-guiding ring (7) is fixedly connected with the inner wall of the cylinder (1) by means of a connecting piece.

7. A mechanical coagulation centrifugal flow-guiding dust-removing demisting device according to any one of claims 1 to 4, characterized in that the top periphery of the large flow-guiding ring (6) is fixedly connected with the inner wall of the cylinder (1) by full-welding.