CN219035109U - A outer lining ceramic impeller for thermal power factory desulfurization slurry pump - Google Patents

Abstract

The utility model discloses an outer lining ceramic impeller for a desulfurization slurry pump of a thermal power plant, which comprises an impeller body, wherein the impeller body comprises a front cover plate, blades, a rear cover plate, a hub and a reverse self-locking screw hole, the reverse self-locking screw hole is positioned on the hub, the front cover plate and the rear cover plate are connected together to form a cavity capable of containing the blades, the hub is positioned on one side of the rear cover plate, the impeller body is cast by adopting a double-phase white high-chromium wear-resistant alloy A49, and a 3-10mm silicon carbide ceramic protective layer is cast on the surface of the impeller body.

Description

A outer lining ceramic impeller for thermal power factory desulfurization slurry pump

Technical Field

The utility model mainly relates to the technical field of slurry circulating pump impellers, in particular to an outer lining ceramic impeller for a desulfurization slurry pump of a thermal power plant.

Background

The thermal power plant is a plant for producing electric energy by using combustible materials as fuel, and the combustible materials of the thermal power plant contain polysulfide in the flue gas after combustion, and the sulfide pollutes the atmosphere, so the sulfur is removed by desulfurization equipment in the thermal power plant. The flue gas limestone-gypsum wet desulfurization process is generally applied at present because of small investment, simple process and mature technology. The limestone slurry is used as an absorbent, SO that flue gas at the tail of a boiler is in contact reaction with the limestone slurry in a spray tower, calcium in the slurry reacts with SO2 in the flue gas to generate gypsum, and other pollutants in the flue gas, such as dust, HF, SO3 and the like, are removed. For this purpose, a large slurry circulation pump should be installed outside the tower to continuously circulate and supply limestone slurry to the tower.

In the prior art, the impeller is one of vulnerable parts of the slurry circulating pump, the slurry circulating pump is subjected to serious chemical corrosion, mechanical abrasion and fluid cavitation of slurry, the slurry circulating pump in the existing market mostly adopts alloy impellers or pure ceramic impellers, the service life of the alloy impellers is about 1-3 years, the damage needs to be replaced, the maintenance cost is higher, the reliability is lower, the tripping operation of a unit and the environment-friendly discharge exceeding of standard are easy to cause, the pure ceramic impellers are more expensive, the practicability is low, and therefore, the problem is solved by providing the outer lining ceramic impeller for the desulfurization slurry pump of the thermal power plant.

Disclosure of Invention

The utility model aims to provide an outer lining ceramic impeller for a desulfurization slurry pump of a thermal power plant, so as to solve the problems in the background art.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the technical scheme adopted for solving the technical problems is as follows:

the utility model provides an outer lining ceramic impeller for thermal power factory desulfurization slurry pump, includes the impeller body, the impeller body is including front shroud, blade, back shroud, wheel hub and reverse auto-lock wire hole, reverse auto-lock wire hole is located on the wheel hub, the front shroud with the back shroud links together and constitutes one can hold the cavity of blade, wheel hub is located back shroud one side.

Preferably, the blades are located in the cavity, the blades in the cavity are provided with a piece, and each blade is in a backward bending structure.

Preferably, the blades and the inner wall of the cavity form a blade groove.

Preferably, a water inlet is formed in the middle of the front cover plate.

Preferably, the water inlet sucks in the liquid slurry or water and throws out after flowing through the blade groove.

Preferably, a silicon carbide ceramic protective layer is arranged on the surface of the impeller body.

Preferably, the casting thickness of the silicon carbide ceramic protective layer is 3-10mm.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the problems in the background technology, the slurry circulating pump impeller is particularly high in abrasion resistance, corrosion resistance, thermal stability and vibration reduction, can operate under the working conditions of high abrasion and strong corrosion of FGD, and is greatly improved in durability and service life compared with a double-phase white high-chromium abrasion-resistant alloy cast steel impeller under normal conditions, is basically equivalent to the performance of a pure ceramic impeller, is low in price compared with the pure ceramic impeller, is high in practicability and saves cost;

2. the slurry circulating pump impeller effectively prolongs the service life, and the service life of the silicon carbide ceramic impeller can reach 5 years, so that the maintenance cost can be reduced, the risks of fault tripping and environment-friendly discharge exceeding standards are reduced, and the normal operation of a thermal power plant unit is ensured;

3. the slurry circulating pump impeller manufactured by the method is stronger than a pure ceramic impeller, is not easy to damage, has close use efficiency, and has low price compared with the pure ceramic impeller, and strong practicability.

The utility model will be explained in detail below with reference to the drawings and specific embodiments.

Drawings

FIG. 1 is an overall exploded view of the present utility model;

FIG. 2 is a schematic view of a front cover plate and a rear cover plate according to the present utility model;

FIG. 3 is a schematic view of a blade according to the present utility model;

fig. 4 is a schematic view of a hub in accordance with the present utility model.

Description of the drawings: 1. a front cover plate; 11. a water inlet; 2. a blade; 3. a back cover plate; 4. a hub; 5. reverse self-locking wire hole; 6. leaf grooves; 7. and a silicon carbide ceramic protective layer.

Detailed Description

The technical solutions of the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and all other embodiments obtained by those skilled in the art without making any inventive effort based on the embodiments of the present utility model are within the scope of protection of the present utility model.

In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. Several embodiments of the utility model are presented. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to the accompanying drawings 1-4, an outer lining ceramic impeller for a desulfurization slurry pump of a thermal power plant comprises an impeller body, wherein the impeller body comprises a front cover plate 1, blades 2, a rear cover plate 3, a hub 4 and a reverse self-locking screw hole 5, the reverse self-locking screw hole 5 is positioned on the hub 4, the impeller body adopts a single-stage single-suction cantilever closed structure, the impeller body is cast by a double-phase white high-chromium wear-resistant alloy A49, compared with a pure ceramic impeller, the impeller is basically equivalent in performance, relatively low in price and strong in practicability, the front cover plate 1 and the rear cover plate 3 are connected together to form a cavity capable of accommodating the blades 2, the hub 4 is positioned on one side of the rear cover plate 3, the blades 2 are positioned in the cavity, 3-12 blades 2 arranged in the cavity are arranged, and each blade 2 is in a backward bending structure, the blades 2 and the inner wall of the cavity form a blade groove 6, a water inlet 11 is arranged in the middle of the front cover plate 1, liquid slurry or water sucked by the water inlet 11 is thrown out after flowing through the blade groove 6, the slurry or water is sucked from the water inlet 11 and thrown out from the periphery of the impeller after flowing through the blade groove 6, the slurry or water axially enters in the flowing direction of the impeller and radially discharges, a slurry pump is arranged beside an absorption tower and a pre-washing tower and is used for recycling gypsum slurry in the thermal power plant tower, the centrifugal force generated when the impeller rotates at a high speed under the driving of a motor enables fluid to obtain energy, the pressure and the kinetic energy can be improved after the slurry or water passes through the impeller, so that the slurry can be conveyed to be higher or far away, meanwhile, negative pressure is formed at the inlet of the pump, the medium can be automatically sucked into the impeller for supplement under the action of atmospheric pressure, and the centrifugal pump continuously works, the method comprises the steps of sucking and extruding media to form continuous flowing and continuously conveying the media, sucking slurry or water from a water inlet 11, throwing the slurry or water out of the periphery of an impeller after flowing through a blade groove 6, wherein the slurry or water axially enters the impeller in the flowing direction and radially discharges the slurry or water, a silicon carbide ceramic protective layer 7 is arranged on the surface of an impeller body, the silicon carbide ceramic protective layer 7 is cast to be 3-10mm thick, the impeller body is cast by adopting a double-phase white high-chromium abrasion-resistant alloy A49, the surface of the impeller body is cast by adopting the silicon carbide ceramic protective layer 7 with 3-10mm, the silicon carbide ceramic protective layer 7 is high-temperature sintered silicon carbide, the relative hardness of the silicon carbide ceramic protective layer 7 is 9.0-9.5, the hardness is as high as diamond, the silicon carbide is also extremely strong in abrasion resistance, the high-temperature cast silicon carbide is uniformly stirred with a modified resin binder in a certain proportion in a vacuum state, the A49 alloy impeller is cast in a mould box, the modified resin is very good binder, the silicon carbide ceramic protective layer has very strong chemical corrosion resistance, the practicability is high, the high-temperature cast silicon carbide ceramic protective layer is subjected to two times of heat treatment after casting, the high-temperature casting silicon carbide ceramic protective layer is subjected to high-temperature heat treatment, the high-temperature heat treatment temperature is 300 ℃, the temperature is lower than the temperature and the temperature is lower than the temperature and the temperature is equal to the temperature 2.60, the temperature is more than the temperature and the temperature is more accurate, the temperature is the temperature and is the temperature is subjected to heat treatment and is lower than the temperature and is the temperature 2 and is subjected to heat treatment and is the temperature 2 and is subjected to the temperature and is accurate.

The specific flow of the utility model is as follows:

the impeller body is cast by adopting a double-phase white high-chromium wear-resistant alloy A49, a 3-10mm silicon carbide ceramic protective layer 7 is cast on the surface, the silicon carbide ceramic protective layer 7 is high-temperature sintered silicon carbide, the relative hardness is 9.0-9.5, the hardness is as high as diamond, the wear resistance is extremely high, the high-temperature cast silicon carbide is uniformly stirred with a modified resin binder according to a certain proportion in a vacuum state, then the A49 alloy impeller is cast in a mould box, and the modified resin is a very good binder, and has very strong chemical corrosion resistance and high practicability;

and after the high-temperature casting silicon carbide is cast, carrying out heat treatment twice, wherein the first heat treatment is carried out at the heating temperature of 300 ℃ for 10 hours, the second heat treatment is carried out by low-temperature curing, the heating temperature is 60 ℃ for 24 hours, so as to eliminate internal stress, and the broken impeller body is subjected to accurate dynamic balance treatment after the heat treatment is finished, wherein the precision grade is G2.5.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. The utility model provides an outer lining ceramic impeller for thermal power factory desulfurization slurry pump, includes the impeller body, its characterized in that, the impeller body is including front shroud (1), blade (2), back shroud (3), wheel hub (4) and reverse auto-lock silk hole (5), reverse auto-lock silk hole (5) are located on wheel hub (4), front shroud (1) with back shroud (3) link together and constitute one can hold the cavity of blade (2), wheel hub (4) are located back shroud (3) one side.

2. The outer lining ceramic impeller for a desulfurization slurry pump of a thermal power plant according to claim 1, wherein the blades (2) are positioned in the cavity, the number of the blades (2) arranged in the cavity is 3-12, and each blade (2) is in a backward bending structure.

3. An outer ceramic impeller for a desulfurization slurry pump in a thermal power plant according to claim 2, wherein the vane (2) and the inner wall of the cavity form a vane groove (6).

4. The outer lining ceramic impeller for the desulfurization slurry pump of the thermal power plant according to claim 2, wherein a water inlet (11) is formed in the middle of the front cover plate (1).

5. An outer lining ceramic impeller for a desulfurization slurry pump in a thermal power plant according to claim 4, wherein the water inlet (11) sucks in slurry or water and throws the slurry or water out after passing through the blade groove (6).

6. An outer lining ceramic impeller for a desulfurization slurry pump in a thermal power plant according to claim 1, wherein a silicon carbide ceramic protective layer (7) is provided on the surface of the impeller body.

7. An outer lining ceramic impeller for a desulfurization slurry pump in a thermal power plant according to claim 6, wherein the silicon carbide ceramic protective layer (7) is cast to a thickness of 3-10mm.

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