A baking furnace facility and method for a double-furnace heating furnace

Abstract

The present invention discloses a baking furnace facility and method for a double-furnace heating furnace, including a demineralized water distributor, a silencer, and a heating furnace with a fuel gas line. A furnace tube is provided inside the heating furnace. One end of the furnace tube extends out of the heating furnace and is connected to a demineralized water distributor, and the other end of the furnace tube extends out of the heating furnace and is connected to a silencer. A flue is connected to the upper end of the heating furnace. It has the technical characteristics of simple structure, strong practicability, being able to carry out baking furnace under the condition that 1.0 MPa steam is not available, performing baking furnace operation in advance, being able to skip the baking furnace operation during the production process, saving the start-up time, and improving the economic benefits.

Description

Technical Field

[0001] The present invention relates to a facility and a method, and more specifically, to a facility and a method for drying a double-furnace heating furnace, belonging to the field of heating furnace facilities. Background Art

[0002] In chemical plants, heating furnaces are common equipment. Among them, tubular heating furnaces are widely used in oil refining and chemical plants. During the construction of heating furnaces, the lining brick masonry and refractory castables contain a large amount of free water, crystal water and residual combined water. After the heating furnace is ignited and put into use, these waters will quickly vaporize and expand, which may cause the furnace wall to crack, bulge, deform or even collapse. Therefore, it is necessary to dry the heating furnace before production to slowly evaporate and precipitate the free water, crystal water and residual combined water, and sinter the furnace wall castables at high temperature. During the drying process, it is necessary to heat slowly and evenly according to the drying curve corresponding to the product characteristics of the castable. The whole process usually takes 5 to 7 days. The commonly used drying method at present is to use the oil transportation materials or nitrogen of the device as the heat-carrying medium for drying. Therefore, it must wait until the construction of the public engineering systems such as the fuel gas system is completed and put into use before it can be carried out. Now, new plants are required to have as short a construction and commissioning time as possible. The existing drying facilities and methods cannot meet the requirements of shortening the production start-up time. Summary of the Invention

[0003] In order to solve the above-mentioned problems in the prior art, the present invention provides a facility and a method for drying a double-furnace heating furnace with the technical characteristics of simple structure, strong practicability, capable of implementing drying under the condition that 1.0 MPa steam is not available, performing drying operation in advance, being able to detect problems in advance by inspection, reserving sufficient time for rectification, ensuring the drying effect, being able to skip the drying operation during the production process, saving the start-up time and improving the economic benefits.

[0004] In order to achieve the above object, the present invention is realized by the following technical solutions:

[0005] A facility for drying a double-furnace heating furnace includes a demineralized water distributor, a silencer and a heating furnace with a fuel gas line. A furnace tube is arranged in the heating furnace. One end of the furnace tube extends out of the heating furnace and is connected to the demineralized water distributor, and the other end of the furnace tube extends out of the heating furnace and is connected to the silencer. A flue is connected to the upper end of the heating furnace.

[0006] Preferably, the furnace tube is connected to the demineralized water distributor through a flange, and the furnace tube is connected to the silencer through a flange.

[0007] Preferably, the demineralized water distributor includes a body. A main channel is arranged inside the body. A demineralized water inlet is connected to the upper end of the body. A 0.3 MPa steam inlet is arranged at the left end of the main channel, and a demineralized water outlet is arranged at the right end of the main channel.

[0008] Preferably, from left to right, the main channel includes a first channel, a second channel, a third channel, a fourth channel, and a fifth channel that are sequentially connected and communicate with each other. The diameter of the first channel is smaller than that of the second channel. The diameter of the third channel gradually decreases. The diameter of the fourth channel is the same as the diameter at the rightmost end of the third channel. The diameter of the fifth channel gradually increases. The demineralized water inlet communicates with the second channel.

[0009] Preferably, a tapered tube with a gradually decreasing diameter extends from the right end of the first channel. The tapered tube extends into the third channel. A mixing chamber is formed at the outlet end of the third channel. The steam at the outlet end of the tapered tube and the demineralized water from the demineralized water inlet are mixed in the mixing chamber and flow into the fourth channel.

[0010] Preferably, the demineralized water inlet is connected to a temporary demineralized water line, and the 0.3 MPa steam inlet is connected to a temporary 0.3 MPa steam line.

[0011] Preferably, there are multiple heating furnaces and they are independent of each other.

[0012] Preferably, multiple heating furnaces are connected to the same flue.

[0013] Preferably, the demineralized water inlet is of a flange structure, which is convenient for connecting to the temporary demineralized water line. The 0.3 MPa steam inlet is of a flange structure, which is convenient for connecting to the temporary 0.3 MPa steam line. The demineralized water outlet is of a flange structure, which is convenient for connecting to the furnace tubes.

[0014] A method for drying the double-furnace heating furnace of the present invention includes the following steps:

[0015] Step 1: After the construction of the heating furnace is completed, naturally ventilate and dry for more than 5 days at ambient temperature, or naturally ventilate and dry for more than 10 days in an environment above 5°C. Open the 0.3 MPa steam line on the demineralized water distributor, introduce steam into the furnace tubes, and put into use the silencer connected to the top of the furnace tubes.

[0016] Step 2: Ignite the burner of the heating furnace to increase the furnace temperature inside the heating furnace. Control the furnace temperature by controlling the fuel gas volume of the furnace burner. The furnace is heated to 150°C at a heating rate not greater than 15°C / h.

[0017] Step 3: Control the furnace temperature at 150°C and keep it constant for 24 hours to remove natural water.

[0018] Step 4: After the dehydration at 150°C is completed, the furnace is heated to 350°C at a rate not greater than 15°C / h. During the heating process, monitor the surface temperature of the furnace tubes. If the surface temperature of the furnace tubes is close to 400°C, then open the manual valve of the 0.3 MPa steam line on the demineralized water distributor to increase the amount of steam introduced into the furnace tubes.

[0019] Step Five: Control the furnace temperature at 350°C and keep it constant for 24 hours;

[0020] Step Six: After the constant temperature at 350°C is completed, raise the furnace temperature to 500°C at a rate not exceeding 15°C / h. During the heating process, monitor the surface temperature of the furnace tubes. If the surface temperature of the furnace tubes approaches 400°C, open the manual valve of the demineralized water distributor to introduce demineralized water into the furnace tubes;

[0021] Step Seven: Control the furnace temperature at 500°C and keep it constant for 24 hours to remove the crystal water;

[0022] Step Eight: After the constant temperature dehydration at 500°C is completed, control the furnace to raise the temperature to 550°C at a rate not exceeding 15°C / h. During the heating process, monitor the surface temperature of the furnace tubes. If the surface temperature of the furnace tubes approaches 400°C, open the manual valve of the demineralized water distributor to increase the amount of demineralized water introduced into the furnace tubes;

[0023] Step Nine: Control the furnace to keep the temperature constant at 550°C for 24 hours for sintering;

[0024] Step Ten: After the constant temperature sintering at 550°C in the furnace is completed, control the furnace to cool down to 150°C at a rate not exceeding 25°C / h. In this stage, control the surface temperature of the furnace tubes not to exceed 400°C. After the furnace temperature drops to 150°C, extinguish the heating furnace burners, stop the demineralized water and 0.3MPa steam, close the flue damper, stop the blower / induced draft fan, and keep the furnace sealed;

[0025] Step Eleven: When the furnace temperature drops to 100°C, open the air damper and flue damper to cool naturally to room temperature, and the furnace drying is completed.

[0026] Beneficial effects: The structure is simple, the operation is convenient, and the market prospect is broad. It enables the new heating furnace to carry out furnace drying under the condition that 1.0MPa steam is not available. Conducting the furnace drying operation in advance can detect problems in advance, reserve sufficient time for rectification, ensure the furnace drying effect, skip the furnace drying operation during the production process, save the start-up time, have a small additional investment, the operation is flexible and controllable, and improve the economic benefits. Description of the Drawings

[0027] Figure 1 is the schematic diagram of the overall structure of the present invention.

[0028] Figure 2 is the structural diagram of the demineralized water distributor of the present invention. Detailed Embodiments

[0029] The following further describes the present invention with reference to the drawings of the specification, but the present invention is not limited to the following embodiments.

[0030] Example 1: There are two heating furnaces, namely Heating Furnace A and Heating Furnace B, and the furnace tubes are respectively the furnace tubes of Furnace Chamber A and Furnace Chamber B; the demineralized water distributor is divided into Demineralized Water Distributor A and Demineralized Water Distributor B; the silencer is divided into Silencer A and Silencer B. In Example 1, only two heating furnaces are selected, and in specific cases, it can be increased or decreased according to the actual situation.

[0031] Specifically: A Demineralized Water Distributor A is installed at the outlet (flange) of the furnace tubes of Furnace Chamber A of Heating Furnace A; a Demineralized Water Distributor B is installed at the outlet (flange) of the furnace tubes of Furnace Chamber B of Heating Furnace B; a Silencer A is installed at the inlet (flange) of the furnace tubes of Furnace Chamber A of Heating Furnace A; a Silencer B is installed at the inlet (flange) of the furnace tubes of Furnace Chamber B of Heating Furnace B; the demineralized water inlets of the Demineralized Water Distributor A / B are connected to the temporary demineralized water line; the 0.3 MPa inlets of the Demineralized Water Distributor A / B are connected to the temporary 0.3 MPa steam line;

[0032] The demineralized water distributor includes a demineralized water inlet, a 0.3 MPa steam inlet, and a demineralized water outlet; the demineralized water inlet is of a flange structure, which is convenient for connecting to the temporary demineralized water line, and the 0.3 MPa steam inlet is of a flange structure, which is convenient for connecting to the temporary 0.3 MPa steam line; the demineralized water outlet is of a flange structure, and the flange specification is the same as that of the temporary drying furnace flange at the outlet of the furnace tubes of the heating furnace, and the demineralized water outlet is connected to the temporary drying furnace flange of the heating furnace tubes.

[0033] The present application creatively adopts the following structure of the demineralized water distributor: The main channel on the demineralized water distributor from left to right includes a first channel, a second channel, a third channel, a fourth channel, and a fifth channel that are connected and communicated in sequence. The diameter of the first channel is smaller than that of the second channel, the diameter of the third channel gradually decreases, the diameter of the fourth channel is the same as the diameter at the rightmost end of the third channel, and the diameter of the fifth channel gradually increases; the demineralized water inlet is communicated with the second channel, and a tapered tube with a gradually decreasing diameter extends from the right end of the first channel, and the tapered tube extends into the third channel. A mixing chamber is formed at the outlet end of the third channel. The steam at the outlet end of the tapered tube and the demineralized water at the demineralized water inlet are mixed in the mixing chamber and flow towards the fourth channel, making the mixed flow more efficient, and the structure is novel.

[0034] Based on the structure in Example 1, drying the furnace is carried out, and the method for drying the furnace includes the following steps:

[0035] Step 1: After the construction of the heating furnace is completed, naturally ventilate and dry for more than 5 days at ambient temperature, or naturally ventilate and dry for more than 10 days in an environment above 5°C. Open the 0.3 MPa steam lines on the Demineralized Water Distributor A and Demineralized Water Distributor B, introduce steam into the furnace tubes of Furnace Chamber A and Furnace Chamber B, and put into use the silencers connected to the top of the furnace tubes;

[0036] Step 2: Ignite the heating burner to increase the furnace temperature. Control the furnace temperature by controlling the fuel gas flow rate of the A / B furnace burners. The A / B furnace is heated to 150°C at a heating rate not exceeding 15°C / h.

[0037] Step 3: Control the temperature of the A / B furnace at 150°C and keep it constant for 24 hours to remove natural water.

[0038] Step 4: After the constant temperature dehydration at 150°C is completed, the A / B furnace is heated to 350°C at a rate not exceeding 15°C / h. During the heating process, monitor the surface temperature of the furnace tubes. If the surface temperature of the furnace tubes approaches 400°C, open the manual valve of the 0.3 MPa steam line on the demineralized water distributor to increase the amount of steam introduced into the furnace tubes.

[0039] Step 5: Control the temperature of the A / B furnace at 350°C and keep it constant for 24 hours.

[0040] Step 6: After the constant temperature at 350°C is completed, the A / B furnace is heated to 500°C at a rate not exceeding 15°C / h. During the heating process, monitor the surface temperature of the furnace tubes. If the surface temperature of the furnace tubes approaches 400°C, open the manual valve of the demineralized water on the demineralized water distributor to introduce a certain amount of demineralized water into the furnace tubes.

[0041] Step 7: Control the temperature of the A / B furnace at 500°C and keep it constant for 24 hours to remove crystal water.

[0042] Step 8: After the constant temperature dehydration at 500°C is completed, control the A / B furnace to heat to 550°C at a rate not exceeding 15°C / h. During the heating process, monitor the surface temperature of the furnace tubes. If the surface temperature of the furnace tubes approaches 400°C, open the manual valve of the demineralized water on the demineralized water distributor to increase the amount of demineralized water introduced into the furnace tubes.

[0043] Step 9: Control the A / B furnace to sinter at a constant temperature of 550°C for 24 hours.

[0044] Step 10: After the constant temperature sintering of the A / B furnace at 550°C is completed, control the A / B furnace to cool down to 150°C at a rate not exceeding 25°C / h. In this stage, control the surface temperature of the furnace tubes not to exceed 400°C. After the furnace temperature drops to 150°C, extinguish the heating burner, stop the demineralized water and 0.3 MPa steam, close the flue damper, stop the blower / induced draft fan, and keep the furnace sealed.

[0045] Step 11: When the temperature of the A / B furnace drops to 100°C, open the air damper and flue damper to cool naturally to room temperature, and the furnace drying is completed.

[0046] In Steps 4 to 10, it is necessary to adjust the steam volume and demineralized water volume of the demineralized water distributor according to the surface temperature of the furnace tubes. By controlling the amount of demineralized water introduced into the furnace tubes, the surface temperature of the two furnace tubes of the A / B furnace is controlled not to exceed 400°C.

[0047] It should be noted that: for different castables, the heating rate in each heating stage and the cooling rate in each cooling stage can be changed accordingly. For different castables, the constant temperature in each constant temperature stage can be changed accordingly. For different castables, the constant temperature time in each constant temperature stage can be changed accordingly.

[0048] Finally, it should be noted that the present invention is not limited to the above embodiments and there can be many variations. All variations that can be directly derived or associated by those of ordinary skill in the art from the disclosed content of the present invention shall be considered as within the protection scope of the present invention.

Claims

1. A baking facility for a double-furnace heating furnace, characterized in that: It includes a demineralized water distributor, a silencer, and a heating furnace with a fuel gas line. There are furnace tubes inside the heating furnace. One end of the furnace tube extends out of the heating furnace and is connected to a demineralized water distributor, and the other end of the furnace tube extends out of the heating furnace and is connected to a silencer. The upper end of the heating furnace is connected to a flue; One side of the furnace tube is connected to the demineralized water distributor through a flange, and the other side of the furnace tube is connected to the silencer through a flange; The demineralized water distributor includes a body. There is a main channel inside the body. The upper end of the body is connected to a demineralized water inlet. A 0.3 MPa steam inlet is provided at the left end of the main channel, and a demineralized water outlet is provided at the right end of the main channel; The demineralized water inlet is of a flange structure, which is convenient for connecting to a temporary demineralized water line. The 0.3 MPa steam inlet is of a flange structure, which is convenient for connecting to a temporary 0.3 MPa steam line. The demineralized water outlet is of a flange structure, which is convenient for connecting to the furnace tube; The method for drying the double-furnace heating furnace includes the following steps: Step 1: After the construction of the heating furnace is completed, naturally ventilate and dry for more than 5 days at ambient temperature, or naturally ventilate and dry for more than 10 days in an environment above 5°C. Open the 0.3 MPa steam line on the demineralized water distributor, introduce steam into the furnace tubes, and put into use the silencer connected to the top of the furnace tubes; Step 2: Ignite the heating furnace burners to increase the furnace temperature inside the heating furnace. Control the furnace temperature by controlling the fuel gas volume of the furnace burners. The furnace is heated to 150°C at a heating rate not greater than 15°C / h; Step 3: Control the furnace temperature at 150°C and keep it constant for 24 hours to remove natural water; Step 4: After the constant temperature dehydration at 150°C is completed, the furnace is heated to 350°C at a rate not greater than 15°C / h. During the heating process, monitor the surface temperature of the furnace tubes. If the surface temperature of the furnace tubes is close to 400°C, then open the manual valve of the 0.3 MPa steam line on the demineralized water distributor to increase the steam volume introduced into the furnace tubes; Step 5: Control the furnace temperature at 350°C and keep it constant for 24 hours; Step 6: After the constant temperature at 350°C is completed, the furnace is heated to 500°C at a rate not greater than 15°C / h. During the heating process, monitor the surface temperature of the furnace tubes. If the surface temperature of the furnace tubes is close to 400°C, then open the manual valve of the demineralized water on the demineralized water distributor to introduce demineralized water into the furnace tubes; Step 7: Control the furnace temperature at 500°C and keep it constant for 24 hours to remove crystal water; Step 8: After the constant temperature dehydration at 500°C is completed, control the furnace to be heated to 550°C at a rate not exceeding 15°C / h. During the heating process, monitor the surface temperature of the furnace tubes. If the surface temperature of the furnace tubes is close to 400°C, then open the manual valve of the demineralized water on the demineralized water distributor to increase the amount of demineralized water introduced into the furnace tubes; Step 9: Control the furnace to be sintered at a constant temperature of 550°C for 24 hours; Step 10: After the constant temperature sintering at 550°C of the furnace is completed, control the furnace to cool down to 150°C at a rate not exceeding 25°C / h. In this stage, control the surface temperature of the furnace tubes not to exceed 400°C. After the furnace temperature drops to 150°C, extinguish the heating furnace burners, stop the demineralized water and 0.3 MPa steam, close the flue damper, stop the blower / induced draft fan, and keep the furnace sealed; Step Eleven: When the furnace temperature drops to 100°C, open the air damper and flue baffle, and let it cool naturally to room temperature, then the furnace baking is completed.

2. The baking furnace facility of a double-furnace heating furnace according to claim 1, characterized in that: The demineralized water inlet is connected to a temporary demineralized water line, and the 0.3 MPa steam inlet is connected to a temporary 0.3 MPa steam line.

3. The baking furnace facility for a double-furnace heating furnace according to claim 1, characterized in that: There are multiple heating furnaces which are independent of each other.

4. A baking facility for a double-furnace heating furnace according to claim 3, characterized in that: Multiple heating furnaces are connected to the same flue.

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