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

Abstract

The invention relates to a blast furnace diffused and recycled coal gas dedusting ash pneumatic conveying device 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 feeding 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 invention relates to blast furnace dust removal technology, in particular to a pneumatic conveying method for blast furnace gas recovery dust removal ash. Background Art

[0002] When the blast furnace is shut down for emergency, short-term or long-term, a large amount of coal gas must be released from the top of the blast furnace. Since the released gas is flammable and explosive (including CO), has a high temperature (up to 350°C), a high pressure (up to 220kPa), a large instantaneous gas flow rate, and is corrosive (the gas contains sulfur ions and chloride ions), and requires rapid release, the traditional method is to release the top gas directly into the atmosphere through the release pipe. When the gas is released directly into the atmosphere, it will carry a large amount of dust and float into the air, causing serious pollution in a short time. Therefore, it is necessary to recover the released gas.

[0003] The main treatment method of dust ash in the existing venting and recovery technology is to discharge the dust ash through the ash discharge valve and the spiral humidifying ash discharge machine, and finally load and transport it by the suction and discharge tank truck. Due to the characteristics of complex composition, high temperature, high pressure, high hardness, and high density of dust ash, secondary dust and other environmental protection problems will inevitably occur during the ash discharge and transportation process, and the coal gas contained in it also involves serious problems such as safety. In order to ensure the smooth operation of dust ash discharge and transportation, many temporary measures must be taken. These temporary measures significantly increase the cost. At the same time, the ash discharge system lacks automatic control, resulting in a large number of staff and high labor intensity. In view of this situation, the dust ash of the furnace top venting gas recovery technology is basically treated in the following two ways: one is to add the dust ash back into the material tank and enter the blast furnace with the charge; but the dust ash is directly added to the blast furnace. Since the dust ash contains moisture and has a fine particle size, it will affect the production of the blast furnace; 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 stable operation of the wet dust removal system. Summary of the invention

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

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A pneumatic conveying device for blast furnace gas emission and recovery dust removal, comprising a furnace top gas emission and recovery dust collector, the furnace top gas emission and recovery dust collector is connected to a conveying pump through a reducer, an electric gate valve, a first bellows, and a feed valve, an exhaust pipe is arranged between the top of the conveying pump and the furnace top gas emission and recovery dust collector, the exhaust pipe is provided with an exhaust valve, one side of the bottom of the conveying pump is connected to a high-pressure power gas pipe, a safety valve, a pressure reducing valve, a butterfly valve, a regulating valve, a main electric ball valve and a main check valve are arranged on the high-pressure power gas pipe in sequence, the other side of the bottom of the conveying pump is connected to a dust removal silo through a fluidizing pipeline, a discharge valve, an inflator and a second bellows are arranged on the fluidizing pipeline, a power gas branch pipe is arranged on the high-pressure power gas pipe to be connected to the inflator, and a spare gas supply pipe is also arranged on the high-pressure power gas pipe to be connected to the conveying 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] A production process for a pneumatic conveying device for blast furnace gas emission and recovery dust ash. The dust ash collected by the furnace top gas emission and recovery dust collector falls into a conveying pump at normal pressure under the action of gravity through a reducer, an electric gate valve, a first bellows, and a feed valve. The feed valve is opened and the exhaust valve is opened at the same time until the conveying pump is full of material, and the feed valve is closed; then high-pressure gas is introduced into a high-pressure power gas pipe, and enters the conveying pump through a pressure reducing valve, a butterfly valve, a regulating valve, a main electric ball valve, and a main check valve to fluidize the dust ash. Another high-pressure gas is diverted through a power gas branch pipe and enters an aerator through a branch pipe ball valve, a branch pipe electric ball valve, and a branch pipe check valve to form a negative pressure inside the aerator. At this time, the discharge valve is opened, and the dense phase fluidized dust ash is attracted by the aerator and fluidized transportation begins after the aerator; the fluidized dust ash enters a dust ash bin.

[0010] The high-pressure gas is clean blast furnace gas or nitrogen, and the pressure is 0.2-0.4MPa.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The present invention adopts fluidization technology for dust ash transportation, so that the dust ash particles form a fluid-like state, thereby solving the problem that the dry ash has poor fluidity and cannot be transported over long distances.

[0013] 2. Since the conveying equipment has few moving parts, the body wear is not great, 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

[0014] Figure 1 It is a structural schematic diagram of the present invention.

[0015] 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 removal 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

[0016] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0017] 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 positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like 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.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0019] like Figure 1A pneumatic conveying device for blast furnace gas emission and recovery dust removal, comprising a furnace top gas emission and recovery dust removal device 1, the furnace top gas emission and recovery dust removal device 1 is connected to a delivery pump 6 through a reducer 2, an electric gate valve 3, a first bellows 4, and a feed valve 5, an exhaust pipe 7 is arranged between the top of the delivery pump 6 and the furnace top gas emission and recovery dust removal device 1, an exhaust valve 8 is arranged on the exhaust pipe 7, a high-pressure power gas pipe 9 is connected to one side of the bottom of the delivery pump 6, 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 arranged on the high-pressure power gas pipe 9 in sequence, the other side of the bottom of the delivery pump 6 is connected to a dust removal ash bin 17 through a fluidizing pipeline 16, a discharge valve 18, an aerator 19 and a second bellows 20 are arranged on the fluidizing pipeline 16, a power gas branch pipe 21 is arranged on the high-pressure power gas pipe 9 and connected to the aerator 19, and a spare gas supply pipe 22 is also arranged on the high-pressure power gas pipe 9 and connected to the delivery pump 6.

[0020] 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.

[0021] 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.

[0022] A production process of a blast furnace gas venting and recovery dust pneumatic conveying device, the dust collected by the furnace top gas venting and 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, the feed valve 5 is opened and 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 are passed through the pressure reducing valve 11 and the butterfly valve. 12. 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, and another high-pressure gas is diverted through the power gas branch pipe 21 to enter the inflator 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 inflator 19. At this time, the discharge valve 16 is opened, and the dense phase fluidized dust ash is attracted by the inflator 19, and fluidized transportation begins after the inflator 19; the fluidized dust ash enters the dust ash bin 17.

[0023] 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 belong to the protection scope 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 without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. In addition, the various different embodiments of the present invention can also be arbitrarily combined, as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

[0024] In order to make the purpose, technical scheme and technical effect of the present invention clearer, the technical scheme in the embodiment of the present invention is now clearly and completely described. However, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. In combination with the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Example 1

[0026] A pneumatic conveying device for blast furnace gas emission and recovery dust removal ash comprises a furnace top gas emission and recovery dust removal device 1, the furnace top gas emission and recovery dust removal device 1 is connected to a delivery pump 6 through a reducer 2, an electric gate valve 3, a first bellows 4, and a feed valve 5, an exhaust pipe 7 is arranged between the top of the delivery pump 6 and the furnace top gas emission and recovery dust removal device 1, an exhaust valve 8 is arranged 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, 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 arranged on the high-pressure power gas pipe 9 in sequence, the other side of the bottom of the delivery pump 6 is connected to a dust removal ash bin 17 through a fluidizing pipeline 16, a discharge valve 18, an aerator 19 and a second bellows 20 are arranged on the fluidizing pipeline 16, a power gas branch pipe 21 is arranged on the high-pressure power gas pipe 9 and connected to the aerator 19, and a spare gas supply pipe 22 is also arranged on the high-pressure power gas pipe 9 and connected to the delivery pump 6.

[0027] 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.

[0028] 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.

[0029] The production process of the pneumatic conveying device for blast furnace gas recovery dust ash, the dust ash collected by the furnace top gas recovery dust collector 1 falls into the normal pressure delivery pump 6 through the reducer 2, the electric gate valve 3, the first bellows 4, and the feed valve 5 under the action of gravity, the feed valve 5 is opened and the exhaust valve 8 is opened at the same time, until the delivery pump 6 is full of material, and the feed valve 5 is closed; then the 0.3MPa blast furnace clean gas is introduced into the high-pressure power gas pipe 9, and the pressure reducing valve 11, the butterfly valve 12, the regulating valve 13, the pressure reducing valve 14, the pressure regulating valve 15, the pressure reducing valve 16, the pressure regulating valve 17, the pressure regulating valve 18, the pressure regulating valve 19, the pressure regulating valve 20, the pressure regulating valve 21, the pressure regulating valve 22, the pressure regulating valve 23, the pressure regulating valve 24, the pressure regulating valve 25, the pressure regulating valve 26, the pressure regulating valve 27, the pressure regulating valve 28, the pressure regulating valve 29, the pressure regulating valve 29, the pressure regulating valve 21, the pressure regulating valve 24, the pressure regulating valve 25, the pressure regulating valve 26, the pressure regulating valve 27, the pressure regulating valve 28, the pressure regulating valve 29, the pressure regulating valve 29, the pressure regulating valve 29, the pressure regulating valve 21, the pressure regulating valve 28, the pressure regulating valve 29, the pressure regulating valve 29, the pressure regulating valve 29, the pressure regulating valve 21, the pressure regulating valve 29, the pressure regulating valve 21, the pressure regulating valve 22, the pressure regulating valve 28, the pressure regulating valve 29, the pressure regulating valve 29, the pressure regulating valve 29, the pressure regulating valve 29, the pressure regulating valve 29, the pressure regulating valve 29, the pressure regulating valve 29 The valve 13, the main electric ball valve 14, and the main check valve 15 enter the delivery pump 6 to fluidize the dust ash, and another high-pressure gas is diverted through the power gas branch pipe 21 to enter the inflator 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 inflator 19. At this time, the discharge valve 16 is opened, and the dense phase fluidized dust ash is attracted by the inflator 19, and fluidized transportation begins after the inflator 19; the fluidized dust ash enters the dust ash bin 17.

[0030] Example 2

[0031] The structure of the pneumatic conveying device for blast furnace gas recovery dust ash in this embodiment is the same as that in embodiment 1, except that 0.25MPa nitrogen is introduced into the high-pressure power gas pipe 9 and enters the conveying pump 6 to fluidize the dust ash.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and basic spirit of the present invention, and that 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 a 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. A high-pressure power gas pipe is connected to one side of the bottom of the delivery pump. A safety valve, a pressure reducing valve, a butterfly valve, a regulating valve, a main electric ball valve and a main check valve are provided on the high-pressure power gas pipe in sequence. The other side of the bottom of the delivery pump is connected to a dust ash bin through a fluidizing pipeline. 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. A spare gas supply pipe is also provided on the high-pressure power gas pipe to connect with 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 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.

4. The production process of a pneumatic conveying device for blast furnace gas recovery dust removal according to claim 1, characterized in that: The dust collected by the furnace top gas recovery dust collector falls into the normal pressure delivery pump under the action of gravity through the reducer, electric plug-in valve, first bellows and feed valve. The exhaust valve is opened at the same time as the feed valve is opened until the delivery pump is full and the feed valve is closed. Then the high-pressure gas is introduced into the high-pressure power gas pipe, and enters the delivery pump through the pressure reducing valve, butterfly valve, regulating valve, main electric ball valve and main check valve to fluidize the dust. Another high-pressure gas is diverted through the power gas branch pipe and enters the aerator through the branch pipe ball valve, branch pipe electric ball valve and branch pipe check valve to form a negative pressure inside the aerator. At this time, the discharge valve is opened, and the dense phase fluidized dust is attracted by the aerator and begins to be fluidized and transported after the aerator. The fluidized dust enters the dust ash bin.

5. The production process of a pneumatic conveying device for blast furnace gas recovery dust removal according to claim 4, characterized in that: The high-pressure gas is clean blast furnace gas or nitrogen, and the pressure is 0.2-0.4MPa.

Images