Steam and flue gas heat exchange device and chemical incineration equipment
By setting up a steam heating pipe in the chemical incineration device to exchange heat between flue gas and steam, the problem of flue gas condensation forming white smoke or ash smoke is solved, the flue gas temperature is increased and pollution is reduced, and the heat exchange of equipment is improved Efficiency and maintenance ease.
Patent Information
- Application Number
- CN202411528888.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-01-10
AI Technical Summary
The flue gas in the existing chemical incineration device is discharged and mixed with cold air, causing water vapor to condense to form white smoke or ash smoke, causing visual pollution.
A steam and flue gas heat exchange device is designed, and by setting a steam heating pipe in the flue gas tank to exchange heat with the flue gas, the emission temperature of the flue gas is increased to eliminate or reduce the white smoke or ash smoke phenomenon. The device includes a flue gas tank, a steam heating circulation pipe assembly, a steam heating pipe, an inlet pipe and an outlet pipe, and heat exchange is performed through a U-shaped bent pipe and a plurality of axially distributed steam heating pipes.
Effectively increase the emission temperature of flue gas, avoid the formation of white smoke or ash smoke, improve the heat exchange efficiency of flue gas, and simplify the maintenance and maintenance process.
Smart Images
Figure CN119289373A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of chemical equipment, and in particular relates to a steam and flue gas heat exchange device and chemical incineration equipment. Background Art
[0002] In existing chemical incineration devices, the current flue gas treatment process is to be discharged to the atmosphere through the exhaust chimney after being treated by a Venturi dust collector, a condenser, and a common flue gas heat exchanger. The current process meets the original emission standards for flue gas particulate matter, but the relative humidity of the wet flue gas discharged is relatively high, close to 100%. When the flue gas is discharged and mixed with the surrounding cold air, the flue gas is cooled by the cold air and the temperature is reduced. Under certain atmospheric temperature and humidity conditions, the water vapor in the flue gas will condense to form small droplets. If there are a large number of droplets in the flue gas, it will reflect or refract sunlight to form a large amount of white smoke or gray smoke. This will cause visual pollution.
[0003] Therefore, it is necessary to design a steam and flue gas heat exchange device and a chemical incineration equipment to eliminate or reduce the white smoke or gray smoke phenomenon. Summary of the invention
[0004] In view of some or all of the above technical problems existing in the prior art, the present invention proposes a steam and flue gas heat exchange device and a chemical incineration device. The steam and flue gas heat exchange device can increase the exhaust temperature of flue gas, thereby helping to eliminate or reduce the white smoke or gray smoke phenomenon.
[0005] According to one aspect of the present invention, there is provided a steam and flue gas heat exchange device, comprising:
[0006] A smoke tank, wherein the smoke tank comprises an inlet section, an outlet section and an intermediate section arranged between the inlet section and the outlet section,
[0007] A steam heating circulation pipe assembly, the steam heating circulation pipe assembly comprising a steam heating pipe arranged in the inner cavity of the middle section, a steam inlet pipe arranged on the middle section and connected to the steam heating pipe, and a steam outlet pipe arranged on the middle section and connected to the steam heating pipe.
[0008] In one embodiment, the steam heating pipe includes a first section for connecting to the steam inlet pipe, a second section for connecting to the steam outlet pipe, and a connecting section arranged between the first section and the second section, and the connecting section is a U-shaped bent pipe.
[0009] In one embodiment, the second section of each of the steam heating tubes is closer to the outlet section than the first section.
[0010] In one embodiment, the steam inlet pipe and the steam outlet pipe matching the same steam heating pipe are spaced no more than 90° apart in the circumferential direction of the smoke cylinder.
[0011] In one embodiment, a plurality of the steam heating tubes are arranged in the inner cavity of the middle section and are spaced apart along the axial direction of the smoke tank, and each of the steam heating tubes is matched with the steam inlet tube and the steam outlet tube.
[0012] In one embodiment, the plurality of steam inlet pipes are evenly distributed along the axial direction of the smoke tank, the plurality of steam outlet pipes are evenly distributed along the axial direction of the smoke tank, and the steam inlet pipes and the steam outlet pipes are distributed at intervals.
[0013] In one embodiment, a drain pipe is provided on the steam outlet pipe, and the drain pipe includes a lead-out section which is connected to the steam outlet pipe and extends from the inlet section to the outlet section, and an external section which is connected to the lead-out section and is perpendicular to the axial direction of the smoke tank.
[0014] In one embodiment, an inspection opening is provided on the middle section, and an inspection door is provided at the inspection opening.
[0015] In one embodiment, the inlet section and the outlet section are both configured as tapered sections, and the cross-sectional area of the end away from the middle section becomes smaller than that of the end close to the middle section.
[0016] According to another aspect of the present invention, there is provided a chemical incineration device, comprising the above-mentioned steam and flue gas heat exchange device, wherein the steam and flue gas heat exchange device is arranged upstream of the exhaust chimney.
[0017] Compared with the prior art, the present invention has the advantage that the device exchanges heat with the flue gas through the steam heating pipe arranged in the flue gas tank, thereby increasing the exhaust temperature of the flue gas, thereby helping to eliminate or reduce the white smoke or gray smoke phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, in which:
[0019] Figure 1 It shows a front view of a steam and flue gas heat exchange device according to an embodiment of the present invention;
[0020] Figure 2 A side view of a steam and flue gas heat exchange device according to an embodiment of the present invention is shown;
[0021] Figure 3 A top view of a steam and flue gas heat exchange device according to an embodiment of the present invention is shown.
[0022] In the drawings, the same reference numerals are used for the same components, but the drawings are not drawn to scale. DETAILED DESCRIPTION
[0023] In order to make the technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than an exhaustive list of all the embodiments. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.
[0024] The embodiment of the present invention provides a steam and flue gas heat exchange device. Figures 1 to 3 As shown, the steam and flue gas heat exchange device includes a flue gas tank 1 and a steam heating circulation pipe assembly. Among them, the flue gas tank 1 contains an inlet section 11, an outlet section 12 and an intermediate section 13 arranged between the inlet section 11 and the outlet section 12. During use, the flue gas enters the inner cavity of the flue gas tank 1 through the inlet of the inlet section 11, and then discharges the flue gas tank 1 through the outlet of the outlet section 12. The steam heating circulation pipe assembly includes a steam heating pipe 2, a steam inlet pipe 3 and a steam outlet pipe 4. The steam heating pipe 2 is arranged in the inner cavity of the intermediate section 13, and is used to exchange heat with the flue gas passing through the inner cavity of the flue gas tank 1 to heat the flue gas, thereby preventing or reducing the white smoke or blue smoke generated by the excessively low temperature of the discharged flue gas. The steam inlet pipe 3 is arranged on the intermediate section 13, and is connected to the steam heating pipe 2, so as to transport the steam outside the flue gas tank 1 into the steam heating pipe 2. The steam outlet pipe 4 is arranged on the middle section 13 and is connected to the steam heating pipe 2 so as to transport the steam and / or condensed water that releases heat out of the flue gas tank 1 .
[0025] It can be seen that the steam and flue gas heat exchange device of the present application can ensure heat exchange between flue gas and steam in the inner cavity of the flue gas tank 1, thereby increasing the temperature of the flue gas and avoiding the phenomenon of white or green smoke in the discharged flue gas.
[0026] Preferably, the steam heating pipe 2 includes a first section 21, a second section 22 and a connecting section 23. Among them, the first section 21 is used to connect with the steam inlet pipe 3, and extends generally in a straight line. The second section 22 is used to connect with the steam outlet pipe 4, and extends generally in a straight line. The connecting section 23 is arranged between the first section 21 and the second section 22, and mainly plays a connecting role. And the connecting section 23 is a U-shaped bending pipe. The U-shaped bending pipe can guide the first section 21 and the second section 22 to extend in a turning manner in the inner cavity of the smoke tank 1, and the length of the steam heating pipe 2 can be appropriately increased to ensure the heat exchange efficiency between steam and smoke. Moreover, the steam heating pipe 2 has a simple structure and is easy to repair and replace.
[0027] The second section 22 of each steam heating tube 2 is closer to the outlet section 12 than the first section 21. It can be seen that in the inner cavity of the smoke tank 1, the first section 21 and the second section 22 are not at the same axial position, but the first section 21 and the second section 22 extend at different axial positions. This arrangement can ensure that the steam does not dissipate heat at the same axial position, but is relatively more evenly distributed in the axial direction of the entire smoke tank 1, which helps to fully utilize the heat of the steam and ensure the efficiency of smoke heating.
[0028] The steam inlet pipe 3 and the steam outlet pipe 4 matching the same steam heating pipe 2 are spaced no more than 90° in the circumferential direction of the smoke tank 1. In the embodiment of the present application, the smoke tank 1 is constructed as a cylinder with a square cross-section, and the steam inlet pipe 3 and the steam outlet pipe 4 are both distributed on a vertical surface of the square cylinder, and the steam inlet pipe 3 and the steam outlet pipe 4 are spaced about 45° in the circumferential direction of the smoke tank 1. This structural optimization can not only effectively increase the length of the steam heating pipe 2, but also facilitate the unified layout of steam input and output, saving production costs.
[0029] A plurality of steam heating tubes 2 are arranged in the inner cavity of the middle section 13. These steam heating tubes 2 are arranged at intervals along the axial direction of the smoke tank 1. By arranging a plurality of steam heating tubes 2, the heat exchange efficiency can be effectively improved, and the smoke entering the smoke tank 1 can be gradually heated. It is also possible to selectively use part of the steam heating tubes 2 during the heating process. It can be seen that the arrangement of a plurality of steam heating tubes 2 makes the selection more flexible during use, thereby effectively ensuring the heating temperature of the smoke. It is easy to understand that each steam heating tube 2 is matched with a steam inlet pipe 3 and a steam outlet pipe 4. In the figure of the present application, an embodiment with eleven steam heating tubes 2 is given. It is easy to understand that the number of the steam heating tubes 2 can be adjusted according to actual conditions.
[0030] A plurality of steam inlet pipes 3 are evenly distributed along the axial direction of the smoke tank 1. A plurality of steam outlet pipes 4 are evenly distributed along the axial direction of the smoke tank 1. The steam inlet pipes 3 and the steam outlet pipes 4 are distributed in an interval manner. The arrangement is structurally optimized and easy to implement, especially the installation operation is not prone to interference and the like. In addition, the arrangement can further ensure the uniformity of the steam heating pipe 2 in the inner cavity of the middle section 13, which helps to improve the heat exchange efficiency.
[0031] According to the present application, a drain pipe 5 is provided on each steam outlet pipe 4. The drain pipe 5 includes a lead-out section 51 and an external section 52. The lead-out section 51 is connected to the steam outlet pipe 4 and extends from the inlet section 11 to the outlet section 12. The external section 52 is connected to the lead-out section 51 and is perpendicular to the axial direction of the flue gas tank 1. In other words, the drain pipe 5 is generally L-shaped. The drain pipe 5 is used for draining sewage when the steam heating pipe 2 is being repaired. The setting position of the drain pipe 5 ensures that the waste of heat source is minimized. In addition, the drain pipe 5 can also divert the sewage to a position away from the steam outlet pipe 4, so as to avoid affecting the normal operation of other corresponding steam outlet pipes 4 during the operation of individual drain pipes 5.
[0032] An inspection port 6 is provided on the middle section 13. An inspection door 7 is provided at the inspection port 6. The inspection port 6 corresponds to at least one steam heating pipe 2. In order to avoid processing troubles, in the embodiment of the present application, when there are 11 steam heating pipes 2, three axially spaced inspection ports 6 are provided in the middle section 13 to complete the inspection work of all steam heating pipes 2. For example, during operation, if a steam heating pipe 2 fails, the inspection door 7 can be opened, and the steam heating pipe 2 can be taken out through the inspection port 6 for maintenance or replacement. The maintenance of some steam heating pipes 2 does not affect the use of other steam heating pipes 2, thereby ensuring the normal operation of the steam and flue gas heat exchange device.
[0033] The inlet section 11 and the outlet section 12 are both constructed as tapered sections, and the end away from the middle section 13 has a smaller cross-sectional area than the end close to the middle section 13. During operation, the flue gas enters through the inlet section 11, and the flow rate decreases to allow sufficient heat exchange between the flue gas and the steam. After the flue gas reaches the outlet section 12, the flow rate increases to ensure that the flue gas flows smoothly through the flue gas tank 1 to the downstream.
[0034] The inlet section 11, the outlet section 12, the steam inlet pipe 3 and the steam outlet pipe 4 are all connected to external pipelines through connecting flanges. This arrangement makes the connection operation convenient.
[0035] The present application also relates to a chemical incineration device, which comprises the above-mentioned steam and flue gas heat exchange device, which is arranged upstream of the emission chimney to protect the downstream emission chimney.
[0036] When the steam and flue gas heat exchange device of the present application is in operation, flue gas enters from the inlet of the inlet section 11 of the steam and flue gas heat exchange device, is heated by the steam heating pipe 2, and is discharged from the outlet of the outlet section 12. The heated steam enters from the steam inlet pipe 3, passes through the steam heating pipe 2, and exits from the steam outlet pipe 4. In the inner cavity of the middle section 13, the flue gas and the steam exchange heat, and the flue gas temperature rises under the action of the steam. A sewage pipe 5 is provided on the steam outlet pipe 4 for sewage discharge when the steam heating pipe 2 is overhauled.
[0037] After the flue gas passes through the steam and flue gas heat exchange device, the flue gas is heated by the steam heating loop pipe 2 set in the middle section 13 of the steam and flue gas heat exchange device. Multiple heating steam loop pipes 2 can better control the flue gas emission temperature not to be too high or too low. The temperature should not only ensure the elimination of the white smoke or gray smoke phenomenon of the original flue gas emission, but also ensure that the steam heat source is not wasted and energy is saved. If some steam heating circulation pipe components fail during operation, the steam inlet pipe 3 and steam outlet pipe 4 of the corresponding section can be closed, and they can be taken out through the corresponding inspection port 6 for maintenance or replacement. The maintenance of some steam heating circulation pipe components does not affect the use of other steam heating circulation pipe components, so as to achieve the elimination of a large amount of white smoke or gray smoke in the exhaust flue gas and continuous production.
[0038] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and / or modifications that fall within the scope of the present invention, and changes and / or modifications made according to the embodiments of the present invention should be included within the scope of protection of the present invention.
Claims
1. A steam and flue gas heat exchange device, characterized in that: include: A smoke tank, wherein the smoke tank comprises an inlet section, an outlet section and an intermediate section arranged between the inlet section and the outlet section, A steam heating circulation pipe assembly, the steam heating circulation pipe assembly comprising a steam heating pipe arranged in the inner cavity of the middle section, a steam inlet pipe arranged on the middle section and connected to the steam heating pipe, and a steam outlet pipe arranged on the middle section and connected to the steam heating pipe.
2. The steam and flue gas heat exchange device according to claim 1, characterized in that: The steam heating pipe comprises a first section for connecting with the steam inlet pipe, a second section for connecting with the steam outlet pipe, and a connecting section arranged between the first section and the second section, wherein the connecting section is a U-shaped bent pipe.
3. The steam and flue gas heat exchange device according to claim 2, characterized in that: The second section of each steam heating tube is closer to the outlet section than the first section.
4. The steam and flue gas heat exchange device according to claim 2 or 3, characterized in that: The steam inlet pipe and the steam outlet pipe matching the same steam heating pipe are spaced no more than 90 degrees apart in the circumferential direction of the flue gas cylinder.
5. The steam and flue gas heat exchange device according to any one of claims 2 to 4, characterized in that: A plurality of steam heating pipes are arranged in the inner cavity of the middle section at intervals along the axial direction of the smoke tank, and each of the steam heating pipes is matched with the steam inlet pipe and the steam outlet pipe.
6. The steam and flue gas heat exchange device according to claim 5, characterized in that: The plurality of steam inlet pipes are evenly distributed along the axial direction of the fume jar, the plurality of steam outlet pipes are evenly distributed along the axial direction of the fume jar, and the steam inlet pipes and the steam outlet pipes are distributed at intervals.
7. The steam and flue gas heat exchange device according to any one of claims 1 to 6, characterized in that: A sewage pipe is arranged on the steam outlet pipe, and the sewage pipe comprises a lead-out section which is arranged on the steam outlet pipe in a communicating manner and extends from the inlet section to the outlet section, and an external section which is connected with the lead-out section and is perpendicular to the axial direction of the smoke tank.
8. The steam and flue gas heat exchange device according to any one of claims 1 to 7, characterized in that: An inspection opening is provided on the middle section, and an inspection door is provided at the inspection opening.
9. The steam and flue gas heat exchange device according to any one of claims 1 to 8, characterized in that: The inlet section and the outlet section are both configured as tapered sections, and the cross-sectional area of the end away from the middle section becomes smaller than that of the end close to the middle section.
10. A chemical incineration equipment, characterized in that: It comprises a steam and flue gas heat exchange device according to any one of claims 1 to 9, wherein the steam and flue gas heat exchange device is arranged upstream of an exhaust chimney.