CN200946976Y - Comprehensive heat exchange and dust removal device for cupola - Google Patents

Abstract

The utility model discloses a cupola integrated heat interchange and dedusting device, which relates to a heat interchange and dedusting device for casting cupolas. Fuel consumption for an extra fuel pre-heating air-supply device of prior art must be added, and the device is huge; while the vacuum type pre-heating air-supply device suffers from the shortcomings of complex structure and poor economical efficiency. The lateral face of a cupola chimney of the utility model is communicated with a heat interchange type inertia dust catcher with a heat exchange room at top communicated with a pre-heating pipe coil which is positioned on the top of the cupola and connected with a cupola wind box, and the heat interchange type inertia dust catcher is connected with an inertia dust-collecting cooler through one piece of pipe, with an inferior part communicated with a bag dust collector and an exhaust pipe through one piece of pipe and a draught fan respectively. The utility model not only adopts a simple structure possessing heat interchanger, thereby improving the thermal efficiency of the cupola, saving energy and reducing the cost, but also combines with a bag dust collector of low manufacturing cost but long service life, thereby ecumenically meeting environmental protection requirement of the cupola.

Description

Comprehensive heat exchange and dust removal device for cupola

technical field

The utility model relates to a casting cupola, more specifically, it is a comprehensive equipment which not only utilizes the exhaust gas of the cupola to preheat the air, but also can remove dust.

Background technique

For the cupola for smelting cast iron, in order to increase the temperature of molten iron, a furnace-type hot-blast cupola has appeared in the prior art. It is equipped with a ribbed furnace in the preheating section of the cupola, and obtains hot air by its own heat exchange. Practice has proved that this kind of furnace hot blast cupola has the following disadvantages: due to the complex structure of the furnace heat exchanger, maintenance is inconvenient, and the service life is short; and the temperature of the hot air is generally around 200 ° C, the thermal efficiency is not high; question.

In order to solve the smoke and dust pollution problem of the cupola, many effective measures have been taken in the prior art. For example, a furnace cap cyclone dust collector is installed on the top of the cupola to replace the spark arrestor, and some water mist nozzles are added to the above furnace cap cyclone dust collector to form a wet dust removal device. The device is bulky, has high manufacturing cost, and is difficult to install and maintain.

The use of high temperature preheating air supply can increase the temperature of molten iron, save coke and reduce pollution, which has been recognized by the foundry industry at home and abroad. This external heating air supply mode includes: preheating air supply with external fuel, air extraction preheating air supply, etc. There is a special coal-fired heating furnace for preheating and air supply with additional fuel, which will increase fuel consumption, and the equipment is relatively large, so the coal-fired heating furnace must be operated by a special person. The exhaust type preheating air supply uses a blower to extract the cupola exhaust gas from the feeding port, and enters the combustion chamber after cyclone dust removal (the combustion chamber is equipped with tuyere and fuel nozzles), then enters the heat exchanger for preheating air supply, and finally passes through The blower discharges and feeds into the cupola. The advantage of this preheating air supply method is that the hot air temperature is high (up to 250-400 ° C) and stable, and the disadvantage is that the structure is complex, so the equipment investment is large and the economy is poor.

Utility model content

The purpose of the utility model is to overcome the shortcomings of the prior art and provide a comprehensive heat exchange and dedusting device for cupola, which not only adopts a heat exchanger with a simple structure, but also effectively improves the thermal efficiency of the cupola, saves energy, and reduces costs. Moreover, it is combined with the bag dust removal device with low manufacturing cost and long service life to economically meet the environmental protection requirements of the cupola.

The utility model is achieved through the following technical solutions:

A comprehensive heat exchange and dedusting device for a cupola, the side of the cupola chimney is connected to a heat exchange type inertial dust collector, the heat exchange chamber on the upper part of the heat exchange type inertial dust collector is connected to the preheating coil placed on the upper part of the cupola, The preheating coil is connected to the bellows of the cupola, and the heat-exchanging inertial dust collector is connected to a kind of inertial dust removal cooler through a pipeline. .

The structure of the heat-exchanging inertial dust collector is as follows: the top diversion chamber A communicates with the exhaust gas of the cupola, the vertical heat exchange tube B placed in the middle of the dust collector communicates with the dust collecting funnel C below it, and the blower communicates with the The heat exchange chamber F between the vertical heat exchange tubes is connected, and the heat exchange chamber D located on the outer layer of the dust collector communicates with the pipeline connected to the inertial dust removal cooler, and the outer layer of the dust collector is provided with a water tank G.

The structure of the inertial dedusting cooler is as follows: the top shunt chamber H communicates with the heat exchange type inertial deduster through pipes, the vertical heat exchange tube K placed in the middle of the cooler communicates with the dust collecting funnel L below it, and is located in the cooling chamber. The lower part of the device is provided with a water inlet pipe that communicates with the water outlet pipe above the cooler through the cooling chamber E.

Compared with the prior art, the utility model adopts the method that the heat exchange and dust removal side are placed outside the furnace, and the cupola flue gas is passed into a heat exchange type inertial dust collector, and the hot gas passes through the heat exchanger to make the drum The incoming air is heated and sent to the chimney preheating coil to further increase the temperature of the preheating air and obtain high-temperature hot air above 300°C, thereby achieving the purpose of increasing the temperature of the molten iron. The thermal efficiency of the cupola is effectively improved, energy is saved, and environmental pollution is reduced. Due to the use of heat exchange facilities outside the furnace, the heat exchange structure is simpler than that of the hot blast furnace, with fewer failures, convenient maintenance and long service life; compared with the traditional furnace cap cyclone dust collector, it reduces the support facilities for the cupola Requirements, low manufacturing cost, convenient installation and maintenance; compared with the suction type preheating air supply device, it greatly simplifies the structure and reduces equipment investment. Since the inertial dust collector and bag filter are installed behind the heat exchange inertial dust collector, the temperature of the smoke and dust is effectively reduced and the dust is further removed. Due to the reasonable combination of heat exchange and dust removal, energy is saved and costs are reduced, and combined with the bag dust removal device with low manufacturing cost and long service life, it more economically meets the environmental protection dust removal requirements of the cupola.

Below in conjunction with accompanying drawing, the utility model is further described by embodiment.

Description of drawings

Figure 1 is a schematic structural view of a cupola comprehensive heat exchange and dust removal device.

Detailed ways

As shown in Figure 1, a comprehensive heat exchange and dust removal device for a large furnace is connected to a heat exchange type inertial dust collector 2 by the side of the chimney of the cupola 1, and the heat exchange chamber F on the upper part of the heat exchange type inertial dust collector 2 is connected to the set It is connected to the preheating coil 11 on the upper part of the cupola, and the preheating coil 11 is connected to the bellows 12 of the cupola. The heat exchange type inertial dust collector 2 is connected to a kind of inertial dust removal cooler 3 through the pipeline 7. The inertial dust removal cooler 3 The lower part of the bag filter communicates with the bag filter 4 through the pipe 8, and the bag filter 4 communicates with the exhaust pipe 13 through the induced draft fan 5.

The structure of the heat-exchanging inertial dust collector 2 is as follows: the top diversion chamber A communicates with the cupola exhaust gas, the vertical heat exchange tube B placed in the middle of the dust collector communicates with the dust collecting funnel C below it, and the blower 6 It communicates with the heat exchange chamber F located between the vertical heat exchange tubes, the heat exchange chamber D located on the outer layer of the dust collector communicates with the pipe 7 connected to the inertial dust removal cooler 3, and the outer layer of the dust collector is provided with a water tank G.

The structure of the inertial dust removal cooler 3 is as follows: the top shunt chamber H communicates with the heat exchange type inertial dust collector 2 through the pipeline 7, and the vertical heat exchange tube K placed in the middle of the cooler communicates with the dust collection funnel L below it. A water inlet pipe 9 is located at the lower part of the cooler, and communicates with an outlet pipe 10 located above the cooler through the cooling chamber E.

Technological process of the present utility model:

Waste (dust) gas passing route (shown in → in Figure 1):

Cupola chimney side → heat exchange inertial dust collector split chamber A → vertical heat exchange tube B → dust collection funnel C → outer heat exchange chamber D → pipe 7 → inertial dust collector cooler 3 split chamber H → vertical heat exchange Pipe K→dust funnel L→bag filter 4→fan 5→exhaust pipe 13.

所示)：Preheating air through the route (in Figure 1

shown):

Blower 6...→Heat exchange chamber F of heat exchange type inertial dust collector...→Preheating coil 11...→Cupola bellows 12.

Inertial dedusting cooler 3 cooling water passing route:

Water inlet pipe 9 → cooling chamber E of inertial dust removal cooler → water outlet pipe 10 .

Water heating via route:

Cold water enters from the bottom of the outer water tank G, and hot water (or steam) is exported from its top. By controlling the water inlet speed, the outlet hot water (or steam) temperature can be controlled.

Claims (3)

1, the comprehensive heat-exchange dedusting device of a kind of furnace cupola, it is characterized in that: the chimney side by furnace cupola (1) is communicated with a kind of heat exchange type inertial dust separator (2), the Heat Room (F) on heat exchange type inertial dust separator (2) top is communicated with the preheat coil that places furnace cupola top (11), preheat coil (11) is connected with furnace cupola bellows (12) again, heat exchange type inertial dust separator (2) is communicated with a kind of inertial dust collection cooler (3) through pipeline (7), the bottom of inertial dust collection cooler (3) is communicated with sack cleaner (4) through pipeline (8), and sack cleaner (4) is communicated with discharge duct (13) through air-introduced machine (5).

2, according to the comprehensive heat-exchange dedusting device of the described furnace cupola of claim 1, it is characterized in that: the structure of described a kind of heat exchange type inertial dust separator (2) is: top diffluence room (A) is communicated with furnace cupola waste gas, place the vertical heat exchanger tube (B) at deduster middle part, be communicated with the control of dust funnel (C) of its below, air blast (6) be communicated with at the vertical Heat Room (F) between the heat exchanger tube, be positioned at the outer field Heat Room of deduster (D) and communicate with the pipeline (7) that is communicated with inertial dust collection cooler (3), the deduster skin is provided with water tank (G).

3, according to the comprehensive heat-exchange dedusting device of the described furnace cupola of claim 1, it is characterized in that: the structure of described inertial dust collection cooler (3) is: top diffluence room (H) is communicated with heat exchange type inertial dust separator (2) through pipeline (7), place the vertical heat exchanger tube (K) at cooler middle part, be communicated with the control of dust funnel (L) of its below, be positioned at the cooler bottom and establish water inlet pipe (9), be communicated with the outlet pipe (10) that is positioned at the cooler top through cooling chamber (E).