A surface cooling system and temperature control method for high-temperature flue gas dust removal process

Abstract

The present invention discloses a surface cooling system and a temperature control method for a high-temperature flue gas dust removal process, comprising a plurality of groups of reverse surface coolers and a plurality of groups of forward surface coolers, the air outlets of the plurality of groups of reverse surface coolers and the plurality of forward surface coolers are respectively fixedly connected with an air outlet duct one, an air outlet duct two and an air outlet duct three, the flue gas cooling dust collection system and the temperature control method of the present invention are convenient for changing and adjusting the flue gas transmission connection line and the direction of the flue gas flow, and adjusting the flue gas cooling area so that the flue gas temperature meets the process requirements, and avoids condensation due to too low a temperature or burning of the bag due to too high a temperature, resulting in production interruption; the forward surface cooler and the reverse surface cooler of the present invention are connected through three groups of two-way regulating coolers to form a closed-loop system, the two-way regulating coolers are designed to be increased or decreased according to needs, the two-way regulating coolers are respectively connected to the corresponding air outlet ducts, and the flue gas flow direction is adjustable.

Description

Technical Field

[0001] The invention relates to the technical field of industrial ventilation, and in particular to a surface cooling system and a temperature control method for a high-temperature flue gas dust removal process. Background Art

[0002] The rotary kiln can efficiently process a large amount of materials by rotating calcination, and is widely used in many industries such as building materials, metallurgy, and chemicals. Its advanced structure and combined scale seal design at both ends reduce air leakage, thereby reducing radiation heat loss and improving energy efficiency. In addition, the rotary kiln is also significantly used in the metallurgical industry, mainly used in the heat treatment and smelting process of steel, non-ferrous metals and ferroalloys, showing a wide range of market value and application prospects.

[0003] The treatment of high-temperature flue gas generated during the production process of the rotary kiln generally uses pulse dust collectors, electric dust collectors, water film dust collectors, etc. Pulse dust collectors are the most popular choice for dust removal due to their high dust collection efficiency and low investment. Pulse dust collectors are currently the most widely used dust removal equipment. Their advantage is that they have high dust collection efficiency, which can reach more than 99.1%. They are the most commonly used equipment to meet the ultra-low emission requirements of environmental protection regulations. Pulse dust collectors need to meet the highest temperature resistance requirements of dust bags.

[0004] However, traditional high-temperature flue gas dust removal has the following disadvantages: Generally, the method of mixing cold air devices is adopted in industry. When the temperature is too high, cold air is mixed in to lower the flue gas temperature and meet the maximum temperature resistance requirements of the dust collector bags. However, it is easy to increase the air intake, causing problems in the fan, pipeline, airflow operation stability and production operation stability. When the flue gas temperature is too low, especially in the initial stage of production line startup and the end of shutdown, as well as when the process is unstable during operation, this problem is easy to occur, resulting in condensation in the pulse dust collector, affecting the air permeability of the dust collector bags, and even causing the dust collector bags to become blocked and fail, resulting in shutdown, causing huge direct and indirect economic losses. There is currently no effective solution to the problem of too low flue gas temperature. The general method is to install a bypass pipe. When the temperature is low, the flue gas is discharged into the desulfurization facility through the bypass pipe, which is easy to cause environmental problems such as excessive particulate matter. Summary of the invention

[0005] The purpose of the present invention is to provide a surface cooling system and temperature control method for a high-temperature flue gas dust removal process, so as to solve the method proposed in the above background technology that a cold air mixing device is generally used in industry. When the temperature is too high, cold air is mixed in to lower the flue gas temperature and meet the maximum temperature resistance requirement of the dust bag. However, it is easy to increase the air intake, causing problems in many aspects such as the stability of the fan, pipeline, airflow operation and production operation. When the flue gas temperature is too low, especially at the beginning of the production line startup and the end of the shutdown, and when the process is unstable during the operation, this problem is easy to occur, resulting in condensation in the pulse dust collector, affecting the air permeability of the dust bag, and even causing the dust bag to become blocked and fail and stop production, causing huge direct and indirect economic losses. There is currently no effective solution to the problem of too low flue gas temperature. The general method is to set up a bypass pipe. When the temperature is low, the flue gas is discharged into the desulfurization facility through the bypass pipe, which is easy to cause environmental problems such as excessive particulate matter.

[0006] To achieve the above object, the present invention provides the following technical solutions: A surface cooling system for a high-temperature flue gas dust removal process comprises a plurality of groups of reverse surface coolers and a plurality of groups of forward surface coolers, the air outlets of the plurality of groups of reverse surface coolers and the plurality of forward surface coolers being respectively fixedly connected with an air outlet pipe one, an air outlet pipe two and an air outlet pipe three, one end of the plurality of groups of reverse surface coolers being connected with a herringbone connecting pipe, the surfaces of the plurality of groups of forward surface coolers being connected with a forward herringbone pipe, the plurality of groups of forward surface coolers being connected with a dust chamber cooling water tank via the forward herringbone pipe, and a temperature measuring instrument being installed at one end of the forward surface cooler.

[0007] As a preferred technical solution of the present invention, outlet pipe valves are fixedly installed in the middle of the outlet pipe one, the middle of the outlet pipe two, and the middle of the outlet pipe three.

[0008] As a preferred technical solution of the present invention, the ends of several groups of the forward surface coolers away from the temperature measuring instruments and the surfaces of several groups of the reverse surface coolers are connected to silos, and silo valves are fixedly installed at the connection between the silo and the forward surface coolers and at the connection between the silo and the reverse surface coolers.

[0009] As a preferred technical solution of the present invention, a herringbone pipe valve is fixedly installed in the middle of the herringbone connecting pipe and the middle of the forward herringbone pipe.

[0010] As a preferred technical solution of the present invention, a pulse dust collector is provided at the bottom between several groups of reverse surface coolers and several forward surface coolers, and the bottom end of the outlet pipe one, the bottom end of the outlet pipe two and the bottom end of the outlet pipe three are all connected to the pulse dust collector.

[0011] As a preferred technical solution of the present invention, several groups of the reverse surface coolers are composed of a group of multiple reverse surface coolers connected in series, and several groups of the forward surface coolers are composed of a group of multiple forward surface coolers connected in series.

[0012] As a preferred technical solution of the present invention, several groups of reverse surface coolers and several forward surface coolers are connected to the first two-way regulating cooler through the outlet pipe one, several groups of reverse surface coolers and several forward surface coolers are connected to the second two-way regulating cooler through the outlet pipe two, and several groups of reverse surface coolers and several forward surface coolers are connected to the third two-way regulating cooler through the outlet pipe three.

[0013] The present invention provides a temperature control method for a surface cooling system in a high-temperature flue gas dust removal process, comprising the following steps: Step 1, set up a cooling system: a forward surface cooler, a first two-way regulating cooler, a second two-way regulating cooler, a third two-way regulating cooler, an outlet pipe 1, an outlet pipe 2, an outlet pipe 3, a reverse surface cooler, a silo, a temperature measuring instrument, a silo valve, a herringbone pipe valve, an outlet pipe valve, and a pulse dust collector constitute a cooling system; Step 2, control the direction of flue gas flow: control the number of herringbone surface coolers through which the high-temperature flue gas passes, control the connection lines of the first two-way regulating cooler, the second two-way regulating cooler, the third two-way regulating cooler, the outlet duct 1, the outlet duct 2, the outlet duct 3 and the pulse dust collector, and the direction of flue gas flow; Step 3: Control the flue gas cooling area: adjust the length and number of the surface coolers through which the flue gas passes, thereby adjusting the flue gas cooling area so that the flue gas temperature entering the pulse dust collector meets the process requirements.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The flue gas cooling dust collection system and temperature control method of the present invention facilitates the change and adjustment of the flue gas transmission connection line and the direction of the flue gas flow, and adjusts the flue gas cooling area so that the flue gas temperature meets the process requirements, avoiding condensation due to too low a temperature or burning of the bag due to too high a temperature, which leads to production interruption; 2. The forward surface cooler and reverse surface cooler of the present invention are connected through three groups of two-way adjustable coolers to form a closed-loop system. The two-way adjustable coolers are designed to be increased or decreased according to needs. The two-way adjustable coolers are respectively connected to the corresponding air outlet ducts, and then connected to the air inlet of the pulse dust collector. The adjustment is flexible, which creates conditions for flexible switching and simultaneous use of forward and reverse flow, and realizes adjustable high-temperature flue gas temperature and adjustable flue gas flow direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a front view of the cooling and dust collecting system of the present invention; Figure 2 A top view of the cooling and dust collecting system of the present invention; Figure 3 It is a left view of the cooling and dust collecting system of the present invention; Figure 4 This is a front view of the connection of the components of the pulse dust collector of the present invention; Figure 5 It is a top view of the connection of the components of the pulse dust collector of the present invention; Figure 6 It is a left side view of the pulse dust collector component connection of the present invention; Figure 7 It is a front view of the connection of the kiln head part of the present invention; Figure 8 It is a flow chart of the present invention.

[0016] In the figure: 1. Reverse surface cooler; 2. Forward surface cooler; 3. Exhaust pipe one; 4. Exhaust pipe two; 5. Exhaust pipe three; 6. Herringbone connecting pipe; 7. Forward herringbone pipe; 8. Dust chamber cooling water tank; 9. Exhaust pipe valve; 10. Thermometer; 11. Silo valve; 12. Herringbone pipe valve; 13. Silo; 14. Pulse dust collector; 15. First two-way regulating cooler; 16. Second two-way regulating cooler; 17. Third two-way regulating cooler. DETAILED DESCRIPTION

[0017] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on 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.

[0018] See also Figure 1-8 The present invention provides a surface cooling system for a high-temperature flue gas dust removal process, comprising a plurality of groups of reverse surface coolers 1 and a plurality of groups of forward surface coolers 2, the air outlets of the plurality of groups of reverse surface coolers 1 and the plurality of forward surface coolers 2 are respectively fixedly connected with an air outlet pipe 1 3, an air outlet pipe 2 4 and an air outlet pipe 3 5, one end of the plurality of groups of reverse surface coolers 1 is connected with a herringbone connecting pipe 6, the surfaces of the plurality of groups of forward surface coolers 2 are connected with a forward herringbone pipe 7, the plurality of groups of forward surface coolers 2 are connected with a dust chamber cooling water tank 8 through the forward herringbone pipe 7, and a temperature measuring instrument 10 is installed at one end of the forward surface cooler 2.

[0019] An outlet pipeline valve 9 is fixedly installed in the middle of the outlet pipeline 1 3 , the middle of the outlet pipeline 2 4 , and the middle of the outlet pipeline 3 5 .

[0020] The ends of several groups of forward surface coolers 2 away from the temperature measuring instrument 10 and the surfaces of several groups of reverse surface coolers 1 are connected with a silo 13, and the connection between the silo 13 and the forward surface cooler 2 and the connection between the silo 13 and the reverse surface cooler 1 are fixedly installed with a silo valve 11.

[0021] A herringbone pipe valve 12 is fixedly installed in the middle of the herringbone connecting pipe 6 and the middle of the forward herringbone pipe 7.

[0022] A pulse dust collector 14 is provided at the bottom between several groups of reverse surface coolers 1 and several forward surface coolers 2, and the bottom ends of outlet pipe 1 3 , outlet pipe 2 4 and outlet pipe 3 5 are all connected to the pulse dust collector 14 .

[0023] A plurality of groups of reverse surface coolers 1 are composed of a group of multiple reverse surface coolers 1 connected in series, and a plurality of groups of forward surface coolers 2 are composed of a group of multiple forward surface coolers 2 connected in series.

[0024] Several groups of reverse surface coolers 1 and several forward surface coolers 2 are connected to a first two-way regulating cooler 15 via an air outlet pipe 1 3 , several groups of reverse surface coolers 1 and several forward surface coolers 2 are connected to a second two-way regulating cooler 16 via an air outlet pipe 2 4 , and several groups of reverse surface coolers 1 and several forward surface coolers 2 are connected to a third two-way regulating cooler 17 via an air outlet pipe 3 5 .

[0025] The present invention provides a temperature control method for a surface cooling system in a high-temperature flue gas dust removal process, comprising the following steps: Step 1, setting up a cooling system: a forward surface cooler 2, a first two-way regulating cooler 15, a second two-way regulating cooler 16, a third two-way regulating cooler 17, an outlet pipe 1 3, an outlet pipe 2 4, an outlet pipe 3 5, a reverse surface cooler 1, a silo 13, a temperature measuring instrument 10, a silo valve 11, a herringbone pipe valve 12, an outlet pipe valve 9, and a pulse dust collector 14 constitute a cooling system; Step 2, control the direction of flue gas flow: control the number of herringbone surface coolers through which the high-temperature flue gas passes, control the connection lines of the first two-way regulating cooler 15, the second two-way regulating cooler 16, the third two-way regulating cooler 17, the outlet duct 1 3, the outlet duct 2 4, the outlet duct 3 5 and the pulse dust collector 14, and the direction of flue gas flow; Step 3: Control the flue gas cooling area: adjust the length and number of the surface coolers through which the flue gas passes, thereby adjusting the flue gas cooling area so that the flue gas temperature entering the pulse dust collector 14 meets the process requirements.

[0026] In the present invention, for the calcination production process, it is necessary to use coal gas or natural gas for heating and calcination, disassemble the connecting sleeve between the kiln head combustion chamber and the temperature-resistant connecting pipe and the connecting sleeve with the smoke collection pipe, use external force to move the kiln head combustion chamber, the kiln head combustion chamber moves along the track to a specified position, install a detachable burner in the smoke collection pipe, open the herringbone pipe valve 12 of the first two-way regulating cooler 15, open the outlet pipe valve 9 of the outlet pipe one 3, close the outlet pipe valves 9 of the outlet pipe two 4 and the outlet pipe three 5, close the silo valve 11 of the silo 13 between the first two-way regulating cooler 15 and the second two-way regulating cooler 16, open the remaining reverse surface coolers 1 and the lower silo 13 The silo valve 11 is used to close the herringbone pipe valves 12 of all other reverse surface coolers 1, and the rotary kiln body is started. After the rotary kiln body rotates normally, the pulse dust collector 14 is started, the induced draft fan is started, the coal gas or natural gas valve is opened, and the detachable burner is ignited. Under the action of the induced draft fan, the flue gas flows into the rotary kiln body, and then flows into the kiln tail box, the herringbone connecting pipe 6 at the kiln tail, and the silo 13 under the reverse surface cooler 1 in sequence. The flue gas passes through the remaining silos 13, the first two-way regulating cooler 15, and the exhaust pipe 3 in sequence. The flue gas then enters the pulse dust collector 14 from the air inlet, is filtered into clean gas, and is transported by the clean gas pipeline through the induced draft fan and discharged into the desulfurization and tail gas treatment. system; increase the burner flame temperature, for the rotary kiln body, when the inner wall temperature of the rotary kiln body reaches the requirement, start feeding from the feed pipe, the raw materials enter the kiln tail preheating cylinder, the rotary kiln body, and the kiln head cooling cylinder from the feed pipe in turn for calcination, and start the blower at the same time to collect waste heat to participate in the preheating of the kiln tail preheating cylinder and the material in the kiln. The flame and flue gas flow in the opposite direction to the material flow, the raw materials are gradually calcined, and the flue gas flows in the above direction. The temperature meter 10 monitors the flue gas temperature, and the cooling area is determined according to the temperature. The herringbone pipe valve 12 of the reverse surface cooler 1 that needs to increase the cooling area is opened. If the cooling area is not enough to cool the flue gas to the required temperature, continue in sequence Activate the second two-way regulating cooler 16 and the gas outlet pipe 2 4, the third two-way regulating cooler 17 and the gas outlet pipe 3 5, open the corresponding herringbone pipe valve 12, and close the corresponding silo valve 11, until the flue gas temperature requirement of the pulse dust collector 14 is reached; according to the need for temperature regulation, decide whether the first two-way regulating cooler 15 and the gas outlet pipe 1 3, the second two-way regulating cooler 16 and the gas outlet pipe 2 4, the third two-way regulating cooler 17 and the gas outlet pipe 3 5 are opened or closed or the opening size individually or in multiple ways, and then the flue gas that further meets the temperature requirement enters the air inlet of the pulse dust collector 14, and the calcined product is discharged from the kiln head and transported to the next process. This process is a reverse production process.

[0027] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A surface cooling system for a high-temperature flue gas dust removal process, comprising a plurality of groups of reverse surface coolers (1) and a plurality of groups of forward surface coolers (2), characterized in that: The air outlets of the plurality of groups of reverse surface coolers (1) and the plurality of forward surface coolers (2) are respectively fixedly connected to an air outlet pipe 1 (3), an air outlet pipe 2 (4) and an air outlet pipe 3 (5); one end of the plurality of groups of reverse surface coolers (1) is connected to a herringbone connecting pipe (6); the surfaces of the plurality of groups of forward surface coolers (2) are connected to a forward herringbone pipe (7); the plurality of groups of forward surface coolers (2) are connected to a dust chamber cooling water tank (8) via the forward herringbone pipe (7); and a temperature measuring instrument (10) is installed at one end of the forward surface cooler (2).

2. A surface cooling system for high-temperature flue gas dust removal process according to claim 1, characterized in that: An air outlet pipeline valve (9) is fixedly installed at the middle of the air outlet pipeline one (3), the middle of the air outlet pipeline two (4), and the middle of the air outlet pipeline three (5).

3. The surface cooling system for high-temperature flue gas dust removal process according to claim 1, characterized in that: The ends of the plurality of groups of the forward surface coolers (2) away from the temperature measuring instrument (10) and the surfaces of the plurality of groups of the reverse surface coolers (1) are connected to a silo (13), and a silo valve (11) is fixedly installed at the connection between the silo (13) and the forward surface cooler (2) and at the connection between the silo (13) and the reverse surface cooler (1).

4. The surface cooling system for high-temperature flue gas dust removal process according to claim 1, characterized in that: A herringbone pipe valve (12) is fixedly installed in the middle of the herringbone connecting pipe (6) and the middle of the forward herringbone pipe (7).

5. The surface cooling system for high-temperature flue gas dust removal process according to claim 1, characterized in that: A pulse dust collector (14) is provided at the bottom between the plurality of groups of reverse surface coolers (1) and the plurality of forward surface coolers (2), and the bottom ends of the outlet duct one (3), the outlet duct two (4) and the outlet duct three (5) are all connected to the pulse dust collector (14).

6. The surface cooling system for high-temperature flue gas dust removal process according to claim 1, characterized in that: The plurality of groups of reverse surface coolers (1) are composed of a group of multiple reverse surface coolers (1) connected in series, and the plurality of groups of forward surface coolers (2) are composed of a group of multiple forward surface coolers (2) connected in series.

7. The surface cooling system for high-temperature flue gas dust removal process according to claim 1, characterized in that: A plurality of groups of reverse surface coolers (1) and a plurality of forward surface coolers (2) are connected to a first two-way regulating cooler (15) via an outlet pipe 1 (3); a plurality of groups of reverse surface coolers (1) and a plurality of forward surface coolers (2) are connected to a second two-way regulating cooler (16) via an outlet pipe 2 (4); and a plurality of groups of reverse surface coolers (1) and a plurality of forward surface coolers (2) are connected to a third two-way regulating cooler (17) via an outlet pipe 3 (5).

8. A temperature control method for a surface cooling system in a high-temperature flue gas dust removal process according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1, setting up a cooling system: a forward surface cooler (2), a first two-way regulating cooler (15), a second two-way regulating cooler (16), a third two-way regulating cooler (17), an outlet pipe 1 (3), an outlet pipe 2 (4), an outlet pipe 3 (5), a reverse surface cooler (1), a silo (13), a temperature measuring instrument (10), a silo valve (11), a herringbone pipe valve (12), an outlet pipe valve (9), and a pulse dust collector (14) form a cooling system; Step 2, controlling the direction of flue gas flow: controlling the number of herringbone surface coolers through which the high-temperature flue gas passes, controlling the connection lines between the first two-way regulating cooler (15), the second two-way regulating cooler (16), the third two-way regulating cooler (17), the outlet duct one (3), the outlet duct two (4), the outlet duct three (5) and the pulse dust collector (14), and the direction of flue gas flow; Step 3: Control the flue gas cooling area: adjust the length and number of the surface coolers through which the flue gas passes, thereby adjusting the flue gas cooling area, so that the flue gas temperature entering the pulse dust collector (14) meets the process requirements.

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