Pneumatic conveying device for blast furnace diffused and recycled coal gas dedusting ash

Abstract

The utility model relates to a pneumatic conveying device for blast furnace diffused and recycled coal gas dedusting ash, which comprises a furnace top diffused coal gas recycling dust remover, the furnace top diffused coal gas recycling dust remover is connected with a conveying pump through a reducer pipe, an electric gate valve, a first corrugated pipe and a feed valve, and an exhaust pipe is arranged between the top of the conveying pump and the furnace top diffused coal gas recycling dust remover. One side of the bottom of the delivery pump is connected with a high-pressure power gas pipe, the high-pressure power gas pipe is sequentially provided with a safety valve, a pressure reducing valve, a butterfly valve, a regulating valve, a main pipe electric ball valve and a main pipe check valve, and the other side of the bottom of the delivery pump is connected with a dust removal bin through a fluidization pipeline; a discharge valve, an inflator and a second corrugated pipe are arranged on the fluidization pipeline, a power gas branch pipe is arranged on the high-pressure power gas pipe and connected with the inflator, and a standby gas supply pipe is further arranged on the high-pressure power gas pipe and connected with the conveying pump. Dedusting ash particles form a fluid-like body, and the problem that dry ash is poor in liquidity and cannot be conveyed for a long distance is solved.

Description

Technical Field

[0001] The utility model relates to a blast furnace dust removal technology, in particular to a blast furnace gas evacuation and recovery dust removal pneumatic conveying device. Background Art

[0002] During emergency, short-term, or long-term blast furnace shutdowns, large amounts of gas must be vented from the furnace roof. Because the vented gas is flammable and explosive (including CO), has high temperatures (up to 350°C), high pressures (up to 220kPa), requires a large instantaneous flow rate, is somewhat corrosive (containing sulfur and chloride ions), and requires rapid venting, the traditional method is to release the top gas directly into the atmosphere through a vent pipe. However, this direct release of gas carries a large amount of dust into the air, quickly causing severe pollution. Therefore, it is necessary to recover the vented gas.

[0003] Existing ash recovery technologies primarily treat dust ash through a combination of ash discharge valves and spiral humidifiers, before it is loaded and transported by suction tank trucks. Due to the complex composition, high temperature, high pressure, high hardness, and high density of dust ash, the discharge and transportation process inevitably leads to environmental issues such as secondary dust emission. Furthermore, the coal gas contained in it poses serious safety concerns. To ensure smooth ash discharge and transportation, numerous temporary measures are required, significantly increasing costs. Furthermore, the lack of automated control in the ash discharge system results in a large number of personnel and high labor intensity. To address this situation, top ash recovery technologies typically employ two methods for dust ash disposal: one is to re-add the dust ash to the charge tank and feed it into the blast furnace along with the charge; the other is to directly add the dust ash to the blast furnace. However, due to the moisture and fine particle size of the dust ash, this can affect blast furnace production. The other is to introduce the dust ash into the subsequent wet dust removal system of the blast furnace. However, this operation is bound to increase the load of the wet dust removal system and affect the stability of the wet dust removal system. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a pneumatic conveying device for recovering blast furnace gas dust, which can realize the dense phase transportation of recovered gas dust and further promote the development of gas emission recovery technology.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A pneumatic conveying device for recovering gas and dust from blast furnaces, comprising a furnace top gas recovery dust collector, which is connected to a delivery pump via a reducer, an electric plug-in valve, a first bellows, and a feed valve. An exhaust pipe is provided between the top of the delivery pump and the furnace top gas recovery dust collector, and an exhaust valve is provided on the exhaust pipe. A high-pressure power gas pipe is connected to one side of the bottom of the delivery pump, and a safety valve, a pressure reducing valve, a butterfly valve, a regulating valve, a main electric ball valve, and a main check valve are sequentially provided on the high-pressure power gas pipe. The other side of the bottom of the delivery pump is connected to a dust ash bin via a fluidizing pipeline, and a discharge valve, an inflator, and a second bellows are provided on the fluidizing pipeline. A power gas branch pipe is provided on the high-pressure power gas pipe to connect with the inflator, and a spare gas supply pipe is also provided on the high-pressure power gas pipe to connect with the delivery pump.

[0007] One end of the power gas branch pipe is connected between the butterfly valve and the regulating valve on the high-pressure power gas pipe, and the other end is connected to the bottom of the inflator. The power gas branch pipe is provided with a branch pipe ball valve, a branch pipe electric ball valve and a branch pipe check valve.

[0008] One end of the backup air supply pipe is connected between the main electric ball valve and the main check valve on the high-pressure power gas pipe, and the other end is connected to the bottom of the delivery pump. The backup air supply pipe is provided with a backup pipe ball valve and a backup pipe check valve.

[0009] Compared with the existing technology, the beneficial effects of the utility model are:

[0010] 1. The utility model adopts fluidization technology for dust ash transportation, so that the dust ash particles form a fluid-like state, solving the problem that dry ash has poor fluidity and cannot be transported over long distances.

[0011] 2. As the conveying equipment has few moving parts, the body wear is small, and it can withstand higher pressure. Under the premise of achieving long-distance continuous transportation, there is no noise pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of the present utility model.

[0013] In the figure: furnace top gas recovery dust collector 1, reducer 2, electric gate valve 3, first bellows 4, feed valve 5, delivery pump 6, exhaust pipe 7, exhaust valve 8, high-pressure power gas pipe 9, safety valve 10, pressure reducing valve 11, butterfly valve 12, regulating valve 13, main pipe electric ball valve 14, main pipe check valve 15, fluidizing pipeline 16, dust ash bin 17, discharge valve 18, inflator 19, second bellows 20, power gas branch pipe 21, spare gas supply pipe 22, branch pipe ball valve 23, branch pipe electric ball valve 24, branch pipe check valve 25, spare pipe ball valve 26, spare pipe check valve 27. DETAILED DESCRIPTION

[0014] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0015] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means more than two.

[0016] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0017] like Figure 1 , a pneumatic conveying device for blast furnace gas and dust recovery, including a furnace top gas recovery dust collector 1, the furnace top gas recovery dust collector 1 is connected to the delivery pump 6 through a reducer 2, an electric plug-in valve 3, a first bellows 4, and a feed valve 5. An exhaust pipe 7 is provided between the top of the delivery pump 6 and the furnace top gas recovery dust collector 1, and an exhaust valve 8 is provided on the exhaust pipe 7. One side of the bottom of the delivery pump 6 is connected to a high-pressure power gas pipe 9, and a safety valve 10, a pressure reducing valve 11, a butterfly valve 12, a regulating valve 13, a main electric ball valve 14 and a main check valve 15 are provided on the high-pressure power gas pipe 9 in sequence. The other side of the bottom of the delivery pump 6 is connected to the dust ash bin 17 through a fluidizing pipe 16, and the fluidizing pipe 16 is provided with a discharge valve 18, an inflator 19 and a second bellows 20. A power gas branch pipe 21 is provided on the high-pressure power gas pipe 9 to connect with the inflator 19. The high-pressure power gas pipe 9 is also provided with a spare gas supply pipe 22 to connect with the delivery pump 6.

[0018] One end of the power gas branch pipe 21 is connected between the butterfly valve 12 and the regulating valve 13 on the high-pressure power gas pipe 9, and the other end is connected to the bottom of the inflator 19. The power gas branch pipe 21 is provided with a branch pipe ball valve 23, a branch pipe electric ball valve 24 and a branch pipe check valve 25.

[0019] One end of the backup air supply pipe 22 is connected between the main electric ball valve 14 and the main check valve 15 on the high-pressure power gas pipe 9, and the other end is connected to the bottom of the delivery pump 6. The backup air supply pipe 22 is provided with a backup pipe ball valve 26 and a backup pipe check valve 27.

[0020] The production process of the blast furnace gas recovery dust pneumatic conveying device is as follows: the dust collected by the furnace top gas recovery dust collector 1 falls into the normal pressure delivery pump 6 under the action of gravity through the reducer 2, the electric gate valve 3, the first bellows 4, and the feed valve 5. When the feed valve 5 is opened, the exhaust valve 8 is opened at the same time until the delivery pump 6 is full, and the feed valve 5 is closed; then 0.2-0.4MPa blast furnace clean gas or nitrogen is introduced into the high-pressure power gas pipe 9, and the pressure reducing valve 11 and the butterfly valve 1 are passed through the pressure reducing valve 11 and the butterfly valve 1. 2. The regulating valve 13, the main electric ball valve 14, and the main check valve 15 enter the delivery pump 6 to fluidize the dust ash. Another high-pressure gas is diverted through the power gas branch pipe 21 and enters the aerator 19 through the branch pipe ball valve 23, the branch pipe electric ball valve 24 and the branch pipe check valve 25, so that a negative pressure is formed inside the aerator 19. At this time, the discharge valve 16 is opened, and the dense phase fluidized dust ash is attracted by the aerator 19 and begins to be fluidized and transported after the aerator 19; the fluidized dust ash enters the dust ash bin 17.

[0021] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all fall within the scope of protection of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner unless there is any contradiction. In order to avoid unnecessary repetition, the present invention will no longer describe various possible combinations separately. In addition, the various different embodiments of the present invention can also be arbitrarily combined, and as long as they do not violate the idea of the present invention, they should also be regarded as the contents disclosed by the present invention.

[0022] To make the purpose, technical solution, and technical effects of the present invention more clearly understood, the technical solutions in the embodiments of the present invention are now described clearly and completely. However, the embodiments described below are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art without inventive effort in conjunction with the embodiments of the present invention are also within the scope of protection of the present invention.

[0023] Example

[0024] A pneumatic conveying device for blast furnace gas recovery dust removal includes a furnace top gas recovery dust collector 1, which is connected to a delivery pump 6 through a reducer 2 (square to round reducer), an electric gate valve 3, a first bellows 4, and a feed valve 5. An exhaust pipe 7 is provided between the top of the delivery pump 6 and the furnace top gas recovery dust collector 1, and an exhaust valve 8 is provided on the exhaust pipe 7. One side of the bottom of the delivery pump 6 is connected to a high-pressure power gas pipe 9. The high-pressure power gas pipe 9 A safety valve 10, a pressure reducing valve 11, a butterfly valve 12, a regulating valve 13, a main electric ball valve 14 and a main check valve 15 are sequentially provided on it. The other side of the bottom of the delivery pump 6 is connected to the dust removal ash bin 17 through a fluidizing pipeline 16. The fluidizing pipeline 16 is provided with a discharge valve 18, an inflator 19 and a second bellows 20. The high-pressure power gas pipe 9 is provided with a power gas branch pipe 21 connected to the inflator 19. The high-pressure power gas pipe 9 is also provided with a spare air supply pipe 22 connected to the delivery pump 6.

[0025] One end of the power gas branch pipe 21 is connected between the butterfly valve 12 and the regulating valve 13 on the high-pressure power gas pipe 9, and the other end is connected to the bottom of the inflator 19. The power gas branch pipe 21 is provided with a branch pipe ball valve 23, a branch pipe electric ball valve 24 and a branch pipe check valve 25.

[0026] One end of the spare air supply pipe 22 is connected between the main electric ball valve 14 and the main check valve 15 on the high-pressure power gas pipe 9, and the other end is connected to the bottom of the delivery pump 6. The spare air supply pipe 22 is provided with a spare pipe ball valve 26 and a spare pipe check valve 27.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and basic spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pneumatic conveying device for blast furnace gas recovery and dust removal, characterized in that: It includes a furnace top vented gas recovery dust collector, which is connected to the delivery pump through a reducer, an electric plug-in valve, a first bellows, and a feed valve. An exhaust pipe is provided between the top of the delivery pump and the furnace top vented gas recovery dust collector, and an exhaust valve is provided on the exhaust pipe. The exhaust valve is provided on the exhaust pipe. One side of the bottom of the delivery pump is connected to the high-pressure power gas pipe. The high-pressure power gas pipe is provided with a safety valve, a pressure reducing valve, a butterfly valve, a regulating valve, a main electric ball valve and a main check valve in sequence. The other side of the bottom of the delivery pump is connected to the dust ash bin through a fluidizing pipeline. The fluidizing pipeline is provided with a discharge valve, an inflator and a second bellows. The high-pressure power gas pipe is provided with a power gas branch pipe connected to the inflator. The high-pressure power gas pipe is also provided with a spare gas supply pipe connected to the delivery pump.

2. The pneumatic conveying device for blast furnace gas recovery dust removal according to claim 1 is characterized in that: One end of the power gas branch pipe is connected between the butterfly valve and the regulating valve on the high-pressure power gas pipe, and the other end is connected to the bottom of the inflator. The power gas branch pipe is provided with a branch pipe ball valve, a branch pipe electric ball valve and a branch pipe check valve.

3. The pneumatic conveying device for blast furnace gas recovery and dust removal according to claim 1 is characterized in that: One end of the backup air supply pipe is connected between the main electric ball valve and the main check valve on the high-pressure power gas pipe, and the other end is connected to the bottom of the delivery pump. The backup air supply pipe is provided with a backup pipe ball valve and a backup pipe check valve.

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