CN204220293U - A kind of gathering-device of flue gas purification system - Google Patents

Abstract

The utility model provides a collection device of a flue gas purification system. Inside the flue gas purification system, there are condensing heat exchangers, collection devices, automatic online flushing systems, cathode systems, rigid fine particle anode dust collection systems and liquid collection tanks in sequence according to the direction of flue gas flow. The liquid collection tanks are set at the bottom of the purification system At the bottom, the collection device of the utility model includes a concave-convex porous collection tank, a collection liquid storage tank, a delivery pump and a valve connected in sequence. The collection tank is arranged below the outlet of the condensation heat exchanger; the concave-convex porous collection tank is conical, and the collection tank The surface of the sloping plate has a concave-convex structure, and the raised top is provided with a flue gas diversion hole; the valve is connected to the water inlet pipe of the automatic online flushing system through a pipe. The utility model utilizes a collection tank with a special structure to use the collected condensed water as the water source of the flushing system of the wet electrostatic precipitator to realize the automatic online flushing function.

Description

A collection device for flue gas purification system

technical field

The utility model relates to a collection device of a flue gas purification system, which belongs to the field of environmental protection in the electric power industry.

Background technique

According to statistics, more than 95% of coal-fired power plants in my country use electrostatic precipitators. As we all know, the dust removal efficiency can reach 99% under normal operating conditions, but the ability to remove fine dust particles is very limited. After the wet desulfurization tower, the fine particle dust and ultrafine droplets atomized by a small amount of slurry cannot be captured by the existing demister at all, and enter the clean flue and chimney with the flue gas; some of the droplets containing ultrafine slurry are migrating It is transformed into aerosol or condensed into large fog droplets, which form "white smoke" after being discharged through the chimney, and even settle near the factory area to form "gypsum rain", which also brings adverse effects on the surrounding ecological environment and residents' lives. The deep purification technology of flue gas in coal-fired power plants can effectively solve the problems of smoke and dust not up to standard and gypsum rain that plague power plants. At the same time, it has a synergistic control effect on precursor pollutants including sulfur trioxide, sulfur dioxide, nitrogen oxides and ammonia, and heavy metal mercury. has important practical significance.

The dust removal principle of wet electrostatic precipitator is similar to that of dry dust collector. The object of wet electrostatic precipitator is composed of dust and mist. Due to the difference in the physical characteristics of mist and dust, its working principle is also different. For the flue gas with high water vapor content and high exhaust temperature, some existing treatment systems will set up condensing heat exchangers to recover the heat of the flue gas, but they do not provide an effective solution for the flue gas and condensed water after heat exchange. collection device. In addition, the wet electrostatic precipitator technology involves a water flushing system. How to collect the water vapor in the wet flue gas after desulfurization as the automatic online flushing water source of the wet electrostatic precipitator is one of the hot topics in this field of research. The existing on-line flushing water source mainly comes from the public process water system of the power plant, which increases the water consumption of the public process water system on the one hand; This increases the equipment selection margin and investment, which is not conducive to saving investment costs.

Contents of the invention

The purpose of this utility model is to provide a collection device for the flue gas purification system, which can effectively collect the water in the flue gas as the water source of the online flushing system, improve the dust removal performance, and realize the purpose of automatic online flushing.

The concrete technical scheme that the utility model adopts is as follows:

A collection device for a flue gas purification system. The interior of the flue gas purification system is sequentially provided with a condensation heat exchanger, a collection device, an automatic online flushing system, a cathode system, a rigid fine particle anode dust collection system, and a liquid collection tank in sequence according to the flow direction of the flue gas. , the liquid collection tank is arranged at the bottom of the purification system, and the collection device includes a concave-convex porous collection tank connected in sequence, a collection liquid storage tank, a delivery pump and a valve, and the collection tank is arranged below the outlet of the condensing heat exchanger; the concave-convex porous The collection tank is conical, the surface of the sloping plate of the collection tank is concave-convex structure, and the top of the protrusion is provided with a smoke guide flow hole; the valve is connected to the water inlet pipe of the automatic online flushing system through a pipeline.

Further, the outlet of the collection tank is connected to the collection liquid storage tank through a water pipe with a certain inclination angle.

The rigid fine particle anode dust collection system includes a rigid dust collection plate and a support beam, and the support beam is located under the rigid dust collection plate and welded to the flue gas purification system body.

Further, the rigid dust collecting plate is arranged in steps, and its material is stainless steel, glass fiber reinforced plastic or fiber fabric.

The utility model utilizes a collection tank with a special structure to use the collected water as the water source of the flushing system of the wet electrostatic device to realize the automatic online flushing function. Using the collection tank to collect the condensed water of the condensing heat exchanger, on the one hand, the automatic online flushing system and the fine particle collection system constitute a double circulation system, and the two operate relatively independently; on the other hand, they are arranged in the same device, both It ensures a higher fine particle capture efficiency, reduces water consumption, reduces land occupation, and saves investment and operating costs.

Description of drawings

Fig. 1 is the structural representation of a kind of flue gas purification system of the present utility model;

Fig. 2 is a detailed structural diagram of the concave-convex porous collection tank of the present invention.

In the figure: 1-original flue gas, 2-clean flue gas, 3-condensing heat exchanger, 4-cathode system, 5-rigid fine particle anode dust collection plate, 6-liquid collection tank, 7-clean flue, 8 -Automatic online flushing device, 9-concave-convex multi-hole collection tank, 10-collection liquid storage tank, 11-delivery pump, 12-valve, 13-flue gas diversion hole, 14-slope plate of collection tank, 15-collection liquid pipeline.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described:

As shown in Figure 1, it is the flue gas purification system used in this embodiment. The condensing heat exchanger 3 is fixedly installed at the flue gas inlet of the flue gas purification system, the raw flue gas 1 enters the condensing heat exchanger 3, and the water vapor condensed by the condensing heat exchanger is collected by the collecting device as the water source of the automatic online flushing device 8, realizing for the purpose of saving water. The flue gas passes through the flue gas guide holes 13 provided on the concave-convex porous collection tank 9 to improve the airflow distribution, and then passes through the rigid fine particle anode dust collecting plate 5, and in the rigid fine particle anode dust collecting plate 5, it is connected to the cathode system 4 The discharge of the cathode line makes the fine particles such as water droplets and smoke dust in the flue gas charged, and moves to the anode under the action of the electric field force, and is collected by the rigid fine particle anode dust collecting plate 5 by the electrostatic force, and the rigid fine particle is collected by the liquid collection tank 6 The water droplets and smoke dust collected by the collection device, the clean flue gas 2 is discharged from the chimney through the clean flue 7 up to the standard. The cathode system 4 mainly includes cathode wires, upper and lower hanging devices, and an insulating box.

Wherein, the collection device includes a concave-convex porous collection tank 9 , a collection liquid storage tank 10 , a water pipe, a delivery pump 11 and a valve 12 . The concave-convex porous collection tank 9 is arranged below the outlet of the condensing heat exchanger 3, and its structure is shown in Figure 2. The surface of the inclined plate 14 of the concave-convex porous collection tank 9 has a concave-convex structure, and a plurality of flue gas conduction holes are arranged on the top of the convex 13. The outlet of the concave-convex porous collection tank 9 is connected to the collection liquid storage tank 10 by an inclined water pipe 15 at a certain angle. The collection liquid is delivered to the nozzle of the automatic online flushing device 8 through the delivery pump 11 and the valve 12 . The water pipes and nozzles are made of duplex stainless steel 2205.

Rigid fine particle anode dust collecting plate 5 is made of rigid material, which can be stainless steel, fiberglass or fiber fabric, and has good corrosion resistance. During normal operation, a continuous water film is formed on the surface of the rigid anode dust collecting plate 5, and the collected smoke and dust flow to the lower liquid collection tank 6 by gravity with the water film to realize online dust removal, thereby purifying the flue gas. The liquid collection tank 6 discharges the collected liquid to the waste water treatment system for comprehensive treatment through the ditch or pit submerged pump.

Claims (4)

1. the gathering-device of a flue gas purification system, flue gas purification system inside is disposed with condensing heat exchanger, gathering-device, automatic on-line rinse-system, cathod system, rigidity fine particle anode dust collecting system and collecting tank according to flow of flue gas direction, collecting tank is arranged on the bottom of cleaning system, it is characterized in that, described gathering-device comprise connect successively concavo-convex porous collection groove, collect liquid storage tank, delivery pump and valve, feeder be arranged on condensing heat exchanger outlet below; Described concavo-convex porous collection groove is pyramid type, and the swash plate surface of feeder is concaveconvex structure, and protruding top arranges flue gas water conservancy diversion through hole; Described valve is connected to the water inlet pipe of automatic on-line rinse-system by pipeline.

2. the gathering-device of a kind of flue gas purification system according to claim 1, is characterized in that, the outlet of described feeder is connected with collection liquid storage tank by the water pipe with certain angle of inclination.

3. the gathering-device of a kind of flue gas purification system according to claim 1 and 2, it is characterized in that, described rigidity fine particle anode dust collecting system comprises rigidity dust collection plate and brace summer, and brace summer is positioned at below rigidity dust collection plate, and is welded on flue gas purification system body.

4. the gathering-device of a kind of flue gas purification system according to claim 3, is characterized in that, described rigidity dust collection plate is that ladder is arranged, and its material is stainless steel, fiberglass or fabric.