Combined feed water preheating device and dry quenching system thereof
By setting a vent valve on the top of the second heat exchange chamber of the condenser of the combined water feed preheating device and a supplementary valve on the introduction section, the problem of the inability to discharge non-condensed gas in the heat pipe heat exchanger is solved, and effective replenishment of the heat transfer working fluid and improving the heat exchange efficiency are achieved.
Patent Information
- Application Number
- CN202421500598.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-06-27
AI Technical Summary
In existing heat pipe heat exchangers, the non-condensed gas in the heat transfer working fluid cannot be effectively discharged, resulting in attenuation of the heat exchange efficiency and affecting the operating efficiency of the dry coke quenching system.
A combined water feed preheating device is designed, including a first heat exchange tube, an evaporator and a condenser. By providing a vent valve on the top of the second heat exchange chamber of the condenser and a replenishment valve on the introduction section, the discharge of non-condensed gas and the replenishment of the heat transfer working fluid is achieved.
Effectively discharge non-condensed gas, avoids heat transfer attenuation of heat transfer working fluid, extends the service life of the equipment, and improves the heat transfer efficiency of the dry coke quenching system.
Smart Images
Figure CN222798959U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of dry coke quenching systems, in particular to a combined feedwater preheating device and a dry coke quenching system thereof. Background Art
[0002] In the CDQ process, the feedwater preheating device is installed on the circulating gas pipeline between the outlet of the circulating fan and the inlet of the CDQ furnace. The boiler feedwater is used to exchange heat with the circulating gas, so that the temperature of the circulating gas entering the CDQ furnace is further reduced, thereby enhancing the heat exchange effect of the CDQ furnace. The heat recovered from the circulating gas is used to heat the boiler feedwater, saving the steam consumption of the deaerator, thereby saving the energy consumption of the entire CDQ device; at the same time, the circulating gas with a further reduced temperature enters the CDQ furnace, reducing the gas-to-material ratio of the CDQ furnace. Therefore, the setting of the feedwater preheating device improves the economy of the entire CDQ device.
[0003] The most commonly used feedwater preheating devices in the CDQ process are feedwater preheaters and heat pipe heat exchangers. Since the localization of CDQ equipment, heat pipe heat exchangers have been used in feedwater preheating devices, which have excellent performance in reducing operating difficulty, preventing dew point corrosion, and reducing equipment maintenance, and have gradually become the mainstream form of feedwater preheating devices.
[0004] The heat pipe heat exchanger is a vacuum sealed container. Each heat exchange tube is evacuated and a heat transfer medium is enclosed in the tube. The heat exchange tube is an eccentric sleeve structure. The outer tube is the evaporation section, which carries the circulating gas; the inner tube is filled with the medium; the inner tube is the condensation section, which carries the boiler feed water. When the evaporation section of the heat exchange tube absorbs heat from the circulating gas, the heat is transferred to the medium in the tube through the tube wall, and the medium vaporizes and evaporates. With the help of the pressure difference, the medium steam is quickly transferred to the condensation section of the inner tube, where the steam condenses into liquid, releases latent heat, and transfers the heat to the boiler feed water through the tube wall. Under the action of gravity, the liquid medium flows back to the evaporation section. Through this repeated cycle of "evaporation-transfer-condensation", heat is transferred from the circulating gas to the boiler feed water.
[0005] Existing heat pipe heat exchangers have at least the following problems: as the use time of the heat pipe heat exchanger increases, non-condensable gases will appear in the heat transfer medium in the inner sleeve of the heat exchange tube, and these non-condensable gases cannot be discharged and remain in the sleeve, causing the heat transfer of the heat transfer medium to decay, thereby affecting the heat exchange effect. Utility Model Content
[0006] The purpose of the utility model is to provide a combined feedwater preheating device and a coke dry quenching system thereof to solve the problems existing in the above-mentioned prior art, so that the non-condensable gas can be effectively discharged from the first heat exchange tube, and the heat transfer medium in the first heat exchange tube can be replenished in time to avoid heat exchange attenuation of the heat transfer medium, thereby affecting the heat exchange effect.
[0007] To achieve the above object, the utility model provides the following solution: The utility model provides a combined feedwater preheating device, including a first heat exchange tube with a heat transfer medium circulating inside, an evaporator and a condenser both of which are shell and tube structures;
[0008] The evaporator is provided with a first heat exchange chamber for circulating gas to flow;
[0009] The condenser is provided with a second heat exchange cavity for the heat transfer medium to flow, and a second heat exchange tube for exchanging heat with the heat transfer medium is provided in the second heat exchange cavity, and both ends of the second heat exchange tube extend out of the second heat exchange cavity respectively and are connected to a boiler feed water pipeline; an air release valve is provided on the top of the second heat exchange cavity;
[0010] The first heat exchange tube includes a heat exchange section, an inlet section and an outlet section. The heat exchange section is located in the first heat exchange chamber and exchanges heat with the circulating gas. The inlet section is connected between the inlet of the heat exchange section and the outlet of the second heat exchange chamber, and is provided with a replenishing valve for replenishing the heat transfer medium. The outlet section is connected between the outlet of the heat exchange section and the inlet of the second heat exchange chamber.
[0011] Preferably, the outlet and the inlet of the second heat exchange chamber are respectively opened at the bottom and the top of the second heat exchange chamber, and the outlet and the inlet of the second heat exchange chamber are distributed on both sides thereof in the horizontal direction.
[0012] Preferably, the second heat exchange tube extends spirally in a vertical direction, and an inlet and an outlet of the second heat exchange tube are respectively arranged at the bottom and the top of the second heat exchange chamber.
[0013] Preferably, the air release valve is arranged on the outlet section and close to the inlet of the second heat exchange chamber.
[0014] Preferably, the first heat exchange chamber is provided with an inlet and an outlet for the circulating gas to enter and exit, and the inlet and the outlet of the first heat exchange chamber are respectively provided at the bottom and the top of the first heat exchange chamber.
[0015] Preferably, the heat exchange section extends spirally in a vertical direction, and an inlet and an outlet of the heat exchange section are respectively located at the bottom and the top of the first heat exchange chamber.
[0016] Preferably, the condenser is located above the evaporator.
[0017] A dry quenching system is also provided, comprising a dry quenching furnace body and a circulating gas pipeline connected to the dry quenching furnace body, the dry quenching furnace body is provided with an air outlet and an air inlet connected to the circulating gas pipeline, the circulating gas pipeline is sequentially connected to a primary dust collector, a boiler, a secondary dust collector and a circulating fan along the gas flow direction, the air outlet end of the circulating fan is connected to the inlet of the first heat exchange chamber of the combined feed water preheating device, and the air inlet of the dry quenching furnace body is connected to the outlet of the first heat exchange chamber.
[0018] Preferably, the air outlet and the air inlet of the CDQ furnace body are respectively opened at the top and the bottom thereof.
[0019] Preferably, the CDQ furnace body is equipped with a loading device and a coke discharge device for introducing and discharging coke, and the conveying direction of coke in the CDQ furnace body is opposite to the flow direction of the circulating gas.
[0020] Compared with the prior art, the utility model has achieved the following technical effects:
[0021] By setting a vent valve on the top of the second heat exchange chamber, non-condensable gases can be discharged in time; a supplementary valve is provided on the inlet section coming out of the second heat exchange chamber, which can inject water and restart the heat transfer medium entering the heat exchange section, overcoming the gradual attenuation and aging of the heat exchange efficiency of heat pipe heat exchangers and greatly extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0023] Figure 1 This is a schematic diagram of the structure of the combined water preheating device of the utility model;
[0024] Figure 2 This is a schematic diagram of the structure of the dry coke quenching system of the utility model;
[0025] Among them, 1- boiler feed water pipeline, 2- second heat exchange pipe, 3- condenser, 4- vent valve, 5- outlet section, 6- replenishing valve, 7- inlet section, 8- heat exchange section, 9- evaporator, 10- loading device, 11- primary dust collector, 12- boiler, 13- dry quenching furnace body, 14- combined feed water preheating device, 15- circulating fan, 16- secondary dust collector, 17- coke discharge device. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0027] The purpose of the utility model is to provide a combined feedwater preheating device and a coke dry quenching system thereof to solve the problems existing in the above-mentioned prior art, so that the non-condensable gas can be effectively discharged from the first heat exchange tube, and the heat transfer medium in the first heat exchange tube can be replenished in time to avoid heat exchange attenuation of the heat transfer medium, thereby affecting the heat exchange effect.
[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0029] like Figure 1 to Figure 2 As shown, this embodiment provides a combined feedwater preheating device, including a first heat exchange tube with a heat transfer medium circulating inside, an evaporator 9 and a condenser 3 both of which are shell and tube structures;
[0030] The evaporator 9 is provided with a first heat exchange chamber for circulating gas to flow;
[0031] The condenser 3 is provided with a second heat exchange cavity for the heat transfer medium to flow, and a second heat exchange tube 2 for exchanging heat with the heat transfer medium is provided in the second heat exchange cavity, and both ends of the second heat exchange tube 2 extend out of the second heat exchange cavity respectively and are connected to the boiler feed water pipeline 1; a vent valve 4 is provided at the top of the second heat exchange cavity;
[0032] The first heat exchange tube includes a heat exchange section 8, an inlet section 7 and an outlet section 5. The heat exchange section 8 is located in the first heat exchange cavity and exchanges heat with the circulating gas. The inlet section 7 is connected between the inlet of the heat exchange section 8 and the outlet of the second heat exchange cavity, and is provided with a supplementary valve 6 for replenishing the heat transfer medium. The outlet section 5 is connected between the outlet of the heat exchange section 8 and the inlet of the second heat exchange cavity. For the evaporator 9, the circulating gas flows along the first heat exchange cavity and is located outside the heat exchange section 8, and the heat transfer medium flows along the inside of the heat exchange section 8. For the condenser 3, the heat transfer medium flows along the second heat exchange cavity and is located outside the second heat exchange tube 2, and the boiler feed water flows along the inside of the second heat exchange tube 2;
[0033] Then the circulating gas is passed into the first heat exchange chamber, and after heat exchange with the heat transfer medium in the heat exchange section 8, the circulating gas temperature drops from 160-180°C to 130°C, and the heat transfer medium in the heat exchange section 8 is heated by the circulating gas and then changes into heat transfer medium gas, and the heat transfer medium gas flows along the heat exchange section 8 into the second heat exchange chamber, and exchanges heat with the boiler feed water in the boiler feed water pipeline 1 in the second heat exchange chamber, the boiler feed water is heated, and the heat transfer medium condenses into liquid, and the condensed heat transfer medium returns to the heat exchange section 8 in the first heat exchange chamber, and circulates back and forth continuously to realize the heat exchange between the circulating gas and the boiler feed water, the heat transfer process is that the heat transfer medium in the heat exchange section 8 is vaporized, taking away the heat of the circulating gas, and the second heat exchange chamber condenses the heat transfer medium into liquid to release heat, thereby ensuring high heat transfer efficiency, wherein the circulating gas is discharged from the first heat exchange chamber after cooling, and then enters the dry quenching furnace. By arranging a vent valve 4 at the top of the second heat exchange chamber, non-condensable gas can be discharged in time; a supplementary valve 6 is provided on the inlet section 7 coming out of the second heat exchange chamber, which can inject water and restart the heat transfer medium in the heat exchange section 8, thereby overcoming the gradual attenuation and aging of the heat exchange efficiency of the heat pipe type heat exchanger and greatly extending the service life of the equipment.
[0034] Among them, the outlet and inlet of the second heat exchange chamber are respectively opened at its bottom and top, and the outlet and inlet of the second heat exchange chamber are distributed on both sides thereof in the horizontal direction, so that the vaporized heat transfer medium flows in from the top of the second heat exchange chamber and one side thereof, and then flows out from the bottom of the second heat exchange chamber and the other side thereof after condensation, so as to be able to be fully replenished into the second heat exchange chamber and ensure sufficient contact with the second heat exchange tube 2.
[0035] Moreover, the second heat exchange tube 2 extends spirally in the vertical direction, and the inlet and outlet of the second heat exchange tube 2 are respectively arranged at the bottom and top of the second heat exchange chamber, so that the boiler feed water in the second heat exchange tube 2 first exchanges heat with the heat transfer medium at the bottom of the second heat exchange chamber when water enters, and exchanges heat with the heat transfer medium at the top of the second heat exchange chamber when water exits, thereby ensuring sufficient heating effect of the boiler feed water.
[0036] As a preferred embodiment of the utility model, the vent valve 4 is arranged on the outlet section 5 and close to the inlet of the second heat exchange chamber, so that the non-condensable gas can be discharged from the top of the second heat exchange chamber through the outlet section 5. There is no need to open an exhaust port in the second heat exchange chamber, thereby ensuring the airtightness of the second heat exchange chamber.
[0037] Furthermore, the first heat exchange chamber is provided with an inlet and an outlet for circulating gas to enter and exit, and the inlet and the outlet of the first heat exchange chamber are respectively provided at the bottom and the top of the first heat exchange chamber, so that the circulating gas flows from bottom to top in the first heat exchange chamber, so as to ensure that the circulating gas can effectively fill the entire first heat exchange chamber, thereby ensuring the heat exchange effect on the heat exchange section 8.
[0038] Moreover, the heat exchange section 8 extends spirally in the vertical direction, and the inlet and outlet of the heat exchange section 8 are respectively located at the bottom and top of the first heat exchange chamber, so that the heat transfer medium in the heat exchange section 8 can flow from bottom to top, thereby ensuring sufficient heat exchange with the circulating gas.
[0039] The condenser 3 is located above the evaporator 9, so that the heat transfer medium in the heat exchange section 8 absorbs heat and becomes gas, then flows from above to the second heat exchange cavity, and then condenses after heat exchange in the second heat exchange cavity, and flows to the introduction section 7 by its own gravity. The temperature of the heat transfer medium after condensation in the introduction section 7 is less than 100°C, thus avoiding the possibility of condensation of water vapor in the circulating gas on the outer surface of the heat exchange section 8, ensuring that there is no attachment outside the heat exchange section 8 and no dew point corrosion.
[0040] A dry quenching system is also provided, comprising a dry quenching furnace body 13 and a circulating gas pipeline connected to the dry quenching furnace body 13, the dry quenching furnace body 13 is provided with an outlet and an inlet connected to the circulating gas pipeline, the circulating gas pipeline is sequentially connected to a primary dust collector 11, a boiler 12, a secondary dust collector 16 and a circulating fan 15 along the gas flow direction, the outlet end of the circulating fan 15 is connected to the inlet of the first heat exchange chamber of the combined water preheating device 14, and the inlet of the dry quenching furnace body 13 is connected to the outlet of the first heat exchange chamber. The red coke at 950-1050°C pushed out from the carbonization chamber of the coke oven is transported and lifted, and finally loaded into the dry quenching furnace body 13. The red hot coke is countercurrently heat exchanged with the inert gas in the dry quenching furnace body 13, the temperature drops to below 200°C, and is discharged from the bottom of the dry quenching furnace body 13. The circulating gas discharged from the dry quenching furnace body 13 is dedusted by the primary dust collector 11 and then enters the boiler 12 for heat exchange, where the temperature drops to 160-180°C. The circulating gas from the boiler 12 is dedusted by the secondary dust collector 16, pressurized by the circulating fan 15, and then cooled to about 130°C by the combined water preheating device 14 before entering the dry quenching furnace body 13 for recycling.
[0041] The air outlet and air inlet of the dry quenching furnace body 13 are respectively opened at the top and bottom positions thereof, so that the circulating gas flows from bottom to top. The dry quenching furnace body 13 is equipped with a loading device 10 and a coke discharge device 17 for introducing and exporting coke, and the conveying direction of coke in the dry quenching furnace body 13 is opposite to the flow direction of the circulating gas, ensuring sufficient heat exchange between the circulating gas and the coke.
[0042] Adaptive changes made according to actual needs are all within the protection scope of this utility model.
[0043] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numerals in the claims should not be regarded as limiting the claims involved.
[0044] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of the present invention. At the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.
Claims
1. A combined water preheating device, characterized in that: It includes a first heat exchange tube with a heat transfer medium circulating inside, and an evaporator and a condenser both of which are shell and tube structures; The evaporator is provided with a first heat exchange chamber for circulating gas to flow; The condenser is provided with a second heat exchange cavity for the heat transfer medium to flow, and a second heat exchange tube for exchanging heat with the heat transfer medium is provided in the second heat exchange cavity, and both ends of the second heat exchange tube extend out of the second heat exchange cavity respectively and are connected to a boiler feed water pipeline; an air release valve is provided on the top of the second heat exchange cavity; The first heat exchange tube includes a heat exchange section, an inlet section and an outlet section. The heat exchange section is located in the first heat exchange chamber and exchanges heat with the circulating gas. The inlet section is connected between the inlet of the heat exchange section and the outlet of the second heat exchange chamber, and is provided with a replenishing valve for replenishing the heat transfer medium. The outlet section is connected between the outlet of the heat exchange section and the inlet of the second heat exchange chamber.
2. The combined water preheating device according to claim 1 is characterized in that: The outlet and the inlet of the second heat exchange chamber are respectively opened at the bottom and the top of the second heat exchange chamber, and the outlet and the inlet of the second heat exchange chamber are distributed on both sides thereof in the horizontal direction.
3. The combined water preheating device according to claim 2 is characterized in that: The second heat exchange tube extends spirally in a vertical direction, and an inlet and an outlet of the second heat exchange tube are respectively arranged at the bottom and the top of the second heat exchange chamber.
4. The combined feedwater preheating device according to claim 2 or 3, characterized in that: The air release valve is arranged on the outlet section and is close to the inlet of the second heat exchange chamber.
5. The combined feedwater preheating device according to claim 4 is characterized in that: The first heat exchange chamber is provided with an inlet and an outlet for the circulating gas to enter and exit, and the inlet and the outlet of the first heat exchange chamber are respectively provided at the bottom and the top of the first heat exchange chamber.
6. The combined feedwater preheating device according to claim 5, characterized in that: The heat exchange section extends spirally in a vertical direction, and an inlet and an outlet of the heat exchange section are respectively located at the bottom and the top of the first heat exchange cavity.
7. The combined feedwater preheating device according to claim 6, characterized in that: The condenser is located above the evaporator.
8. A coke dry quenching system using the combined feedwater preheating device according to any one of claims 1 to 7, characterized in that: It includes a dry quenching furnace body and a circulating gas pipeline connected to the dry quenching furnace body, the dry quenching furnace body is provided with an air outlet and an air inlet connected to the circulating gas pipeline, the circulating gas pipeline is sequentially connected with a primary dust collector, a boiler, a secondary dust collector and a circulating fan along the gas flow direction, the air outlet end of the circulating fan is connected to the inlet of the first heat exchange chamber of the combined water preheating device, and the air inlet of the dry quenching furnace body is connected to the outlet of the first heat exchange chamber.
9. The dry coke quenching system according to claim 8, characterized in that: The air outlet and air inlet of the CDQ furnace body are respectively arranged at the top and bottom thereof.
10. The dry coke quenching system according to claim 9, characterized in that: The CDQ furnace body is equipped with a loading device and a coke discharge device for introducing and discharging coke, and the conveying direction of coke in the CDQ furnace body is opposite to the flow direction of circulating gas.