Low-temperature economizer

Abstract

The embodiment of the utility model discloses a low-temperature economizer. The low-temperature economizer comprises a tube bank, a tube box, a disturbance assembly, an air inducing device and a dust removing assembly. Wherein the disturbance assembly disturbs dust and impurities adsorbed on the inner wall of the tube box and the outer wall of the tube row, so that the dust and impurities are separated from the tube box and the tube row and can rise to the dust removal device arranged at the top end of the tube box along with smoke sucked by the air inducing device, and the dust removal device is used for collecting the dust and impurities and preventing the dust and impurities from blocking the top end of the tube box or polluting the production space of a plant. According to the technical scheme, impurities and dust deposited and blocked in the tube box can be effectively removed, the working efficiency of the low-temperature economizer is improved, meanwhile, flying dust is reduced to a certain degree, the environmental protection property of the economizer is improved, and in the actual use process, when a boiler is shut down for overhauling, a combustion assembly and a dust removal device are additionally arranged at the bottom of an outlet flue of the low-temperature economizer. And after the unit is started, the current of the side induced draft fan is respectively reduced by 7.3 A and 8.4 A under the load of 180MW compared with the current before the technical scheme is applied.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of coke oven coking, and in particular to a low-temperature economizer. Background Art

[0002] The low-temperature economizer is essentially a steam-water heat exchange device. It achieves heat conversion and reduces the flue gas temperature by exchanging heat between high-temperature flue gas and low-temperature medium. At the same time, the temperature of the low-temperature exchange medium is increased, so that the waste heat can be utilized. The low-temperature economizer is combined with the electrostatic precipitator technology, and enters the desulfurization tower through the induced draft fan, so that the exhaust gas meets the environmental protection requirements of temperature and humidity. It improves the dust removal efficiency and meets the emission requirements of power plants and other units.

[0003] After using the existing low-temperature economizer for a period of time, dust and particles in the flue gas will be deposited on the inner wall of the economizer to form ash scale. These ash scales are not easy to clean, and at the same time cause the pipes and channels of the economizer to become narrower or even completely blocked. The blockage of the economizer pipe hinders the flow of flue gas, reduces the flue gas flow rate, and the heat exchange effect of the economizer is poor, thereby reducing the thermal efficiency of the boiler. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art or related technology.

[0005] To this end, the utility model provides a low-temperature economizer, comprising:

[0006] A tube row, wherein the tube row is a serpentine tube row, and the number of the tube row is multiple;

[0007] a pipe box, wherein a plurality of the pipe rows are arranged longitudinally inside the pipe box;

[0008] A disturbance component, used to disturb the dust and particulate matter deposited in the pipe box;

[0009] An air induction device, the air induction device is arranged at the top of the pipe box;

[0010] A dust removal device is arranged between the air induced device and the pipe box.

[0011] In a feasible implementation manner, the longitudinal spacing between the tube rows longitudinally arranged in the tube box is greater than or equal to 116 mm.

[0012] In a feasible implementation manner, the disturbance component includes:

[0013] An air compressor, wherein the air compressor is used to provide compressed air;

[0014] A main pipe, one end of which is connected to the air compressor;

[0015] a first valve, the first valve being arranged on the mother pipe;

[0016] The main pipe is connected to the air inlet ends of a plurality of branch pipes, and the air outlet ends of the plurality of branch pipes are longitudinally arranged on one side of the pipe box.

[0017] In a feasible implementation manner, the disturbance component further includes:

[0018] A filter element is arranged on the main pipe and is used for filtering compressed air.

[0019] In a feasible implementation manner, the disturbance component further includes:

[0020] The second valves are arranged on the branch pipes. The number of the second valves corresponds to the number of the branch pipes.

[0021] In a feasible implementation manner, the dust removal device includes:

[0022] A discharge electrode, the discharge electrode is used to make the fly ash carry electric charge;

[0023] A dust suction electrode, the dust suction electrode is used to absorb the flying dust carrying the charge;

[0024] A dust collecting box is used to collect flying dust.

[0025] In a feasible implementation manner, the dust removal device further includes:

[0026] A monitoring component is used to monitor the space margin inside the dust box.

[0027] In a feasible implementation manner, the monitoring component includes:

[0028] An infrared distance measuring component, wherein the infrared distance measuring component is used to monitor the amount of dust in the dust collecting box;

[0029] The indicator light is on when the dust storage in the dust box exceeds a threshold value.

[0030] In a feasible implementation manner, the number of the pipe boxes is two, the gas outlet end of the branch pipe is arranged between the two pipe boxes, and the number of the gas outlet ends of the branch pipe is two.

[0031] In a feasible implementation manner, the disturbance component further includes:

[0032] A flat nozzle is arranged at the air outlet of the branch pipe.

[0033] Compared with the prior art, the present invention has at least the following beneficial effects:

[0034] The low-temperature economizer provided in the embodiment of the present application includes a tube row, a tube box, a disturbance component, an induced draft device and a dust removal component.

[0035] High-temperature flue gas often contains impurities. After a period of use, dust and particles in the flue gas are deposited on the inner wall to form ash scale. These ash scales are not easy to clean, and at the same time cause the pipes and channels of the economizer to become narrower or even completely blocked. The blockage of the economizer pipe hinders the flow of flue gas, reduces the flue gas flow rate, and the heat exchange effect of the economizer is poor, thereby reducing the thermal efficiency of the boiler.

[0036] Therefore, a disturbance component and a dust removal device are additionally provided, wherein the disturbance component disturbs the dust impurities adsorbed on the inner wall of the pipe box and the outer wall of the pipe row, so that they are separated from the pipe box and the pipe row, and can rise to the dust removal device arranged at the top of the pipe box along with the flue gas sucked by the induced draft device. The dust removal device is used to collect dust impurities to prevent them from clogging the top of the pipe box or polluting the production space of the factory building.

[0037] This technical solution can effectively remove the impurities and ash deposited and blocked inside the tube box, prevent the ash from affecting the heat exchange between the heat exchange medium and the high-temperature flue gas, improve the working efficiency of the low-temperature economizer, and reduce the flying dust to a certain extent, improving the environmental protection of the economizer. In actual use, when the boiler is shut down for maintenance, the combustion components and dust removal device are installed at the bottom of the outlet flue of the low-temperature economizer. After the unit is started, the side induced draft fan is under a load of 180MW, and the current is reduced by 7.3A and 8.4A respectively compared with before the application of this technical solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0039] Figure 1 A structural block diagram of a low-temperature economizer according to an embodiment of the present application.

[0040] in, Figure 1 The corresponding relationship between the reference numerals and the component names is as follows:

[0041] 110, pipe row; 120, pipe box; 130, disturbance component; 140, air induction device; 150, dust removal device;

[0042] 131. air compressor; 132. main pipe; 133. first valve; 134. branch pipe; 135. filter element; 136. second valve. DETAILED DESCRIPTION

[0043] In order to better understand the above-mentioned technical scheme, the technical scheme of the embodiments of the present application is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical scheme of the embodiments of the present application, rather than limitations on the technical scheme of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments may be combined with each other.

[0044] like Figure 1 As shown, according to an embodiment of the present application, a low-temperature economizer is proposed, including: a tube row 110, wherein the tube row 110 is a serpentine tube row 110, and the number of the tube rows 110 is multiple; a tube box 120, wherein multiple tube rows 110 are longitudinally arranged inside the tube box 120; a disturbance component 130, used to disturb dust and particulate matter deposited in the tube box 120; an induced draft device 140, wherein the induced draft device 140 is arranged at the top of the tube box 120; and a dust removal device 150, wherein the dust removal device 150 is arranged between the induced draft device 140 and the tube box 120.

[0045] The low-temperature economizer provided in the embodiment of the present application includes a tube row 110, a tube box 120, a disturbance component 130, an induced draft device 140 and a dust removal component.

[0046] The tube row 110 is a serpentine tube row 110 , which is longitudinally arranged inside the tube box 120 , and a low-temperature heat exchange medium flows inside the tube row 110 .

[0047] Among them, the induced draft device 140 is arranged at the top of the pipe box 120 to provide power for the high-temperature flue gas. The high-temperature flue gas passes through the pipe box 120 and completes heat exchange with the low-temperature heat exchange medium in the pipe row 110, thereby achieving the effect of saving coal.

[0048] However, high-temperature flue gas often contains impurities. After a period of use, dust and particles in the flue gas are deposited on the inner wall to form scale. These scales are not easy to clean, and at the same time cause the pipes and channels of the economizer to become narrower or even completely blocked. The blockage of the economizer pipe hinders the flow of flue gas, reduces the flue gas flow rate, and the heat exchange effect of the economizer is poor, thereby reducing the thermal efficiency of the boiler.

[0049] Therefore, a disturbance component 130 and a dust removal device 150 are additionally provided, wherein the disturbance component 130 disturbs the dust impurities adsorbed on the inner wall of the pipe box 120 and the outer wall of the pipe row 110, so that the dust impurities are separated from the pipe box 120 and the pipe row 110, and can rise to the dust removal device 150 arranged at the top of the pipe box 120 along with the smoke attracted by the induced draft device 140. The dust removal device 150 is used to collect the dust impurities to prevent them from clogging the top of the pipe box 120 or polluting the production space of the factory building.

[0050] This technical solution can effectively remove the impurities and ash deposited and blocked inside the pipe box 120, prevent the ash from affecting the heat exchange between the heat exchange medium and the high-temperature flue gas, improve the working efficiency of the low-temperature economizer, and reduce the flying dust to a certain extent, thereby improving the environmental protection of the economizer. In actual use, when the boiler is shut down for maintenance, the combustion assembly and dust removal device 150 are installed at the bottom of the outlet flue of the low-temperature economizer. After the unit is started, the current of the side induced draft fan is reduced by 7.3A and 8.4A respectively under a load of 180MW compared with before the application of this technical solution.

[0051] like Figure 1 As shown, the longitudinal spacing between the tube rows 110 longitudinally arranged in the tube box 120 is greater than or equal to 116 mm.

[0052] In the prior art, the longitudinal spacing of the tube row 110 in the tube box 120 is usually 106 mm. At this spacing, the inlet and outlet pressure difference is large, which is prone to dust blockage. The present technical solution limits the spacing of the tube row 110, which is greater than or equal to 116 mm. In actual use, when the spacing of the tube row 110 is 116 mm, the dust blockage situation is effectively improved.

[0053] As shown in the figure, the disturbance component 130 includes: an air compressor 131, which is used to provide compressed air; a main pipe 132, one end of which is connected to the air compressor 131; a first valve 133, which is arranged on the main pipe 132; and a branch pipe 134, the main pipe 132 is connected to the air inlet ends of a plurality of branch pipes 134, and the air outlet ends of the plurality of branch pipes 134 are longitudinally arranged on one side of the pipe box 120.

[0054] In this technical solution, the disturbance component 130 includes an air compressor 131, a main pipe 132, a first valve 133 and a branch pipe 134, wherein one end of the main pipe 132 is connected to the air compressor 131, and the other end of the main pipe 132 is connected to a plurality of branch pipes 134, and the first valve 133 is arranged on the main pipe 132, wherein the air outlet ends of the branch pipes 134 are arranged longitudinally on one side of the pipe box 120. When disturbance is performed, the air compressor 131 introduces compressed air into the main pipe 132, and then enters a plurality of branch pipes 134 from the main pipe 132, and is blown into the pipe box 120 from the air outlet ends of the branch pipes 134, thereby completing the disturbance of the dust blocking inside the pipe box 120.

[0055] Among them, the air flow generated by the induced draft device 140 is longitudinal, and the disturbance component 130 generates a transverse compressed air flow, which can greatly reduce the possibility of fly ash clogging inside the pipe box 120. At the same time, the fly ash disturbed by the disturbance component 130 can be brought out of the pipe box 120 through the induced draft device 140, thereby ensuring the cleanliness of the pipe box 120 to a certain extent.

[0056] like Figure 1 As shown, the disturbance component 130 further includes: a filter element 135, and the filter element 135 is disposed on the main pipe 132 for filtering the compressed air.

[0057] In this technical solution, the disturbance component 130 also includes a filter element 135, which is arranged on the main pipe 132 and can filter dust in the air sucked in by the air compressor 131. This arrangement can reduce the dust removal pressure of the dust removal device 150, and at the same time can avoid the risk of dust blockage in the pipe box 120 caused by compressed air when the dust content in the air is high.

[0058] like Figure 1 As shown, the disturbance component 130 further includes: second valves 136 , the number of the second valves 136 corresponds to the number of the branch pipes 134 , and the second valves 136 are disposed on the branch pipes 134 .

[0059] In this technical solution, the disturbance component 130 also includes a second valve 136. Each branch pipe 134 is provided with a second valve 136. When the disturbance pressure is relatively large, the second valve 136 can be opened and closed in turn, thereby achieving the effect of increasing the soot blowing power of the disturbance component 130 without replacing a higher-power air compressor 131. This technical solution improves the flexibility of the disturbance component 130.

[0060] like Figure 1 As shown, the dust removal device 150 includes: a discharge electrode, which is used to make the flying dust carry electric charges; a dust suction electrode, which is used to absorb the flying dust carrying electric charges; and a dust collecting box, which is used to collect the flying dust.

[0061] In this technical solution, the dust removal device 150 includes a discharge electrode, a dust suction electrode and a dust collecting box. During use, the dust removal device 150 is arranged between the induced draft device 140 and the pipe box 120. The induced draft device 140 attracts flying dust to fly out from the top of the pipe box 120. The discharge electrode discharges so that the flying dust passing through the dust removal device 150 carries electric charge. The dust suction electrode attracts the flying dust carrying the charge. The flying dust carrying the charge attracted by the dust suction electrode is collected into the dust collecting box.

[0062] This arrangement achieves the attraction and collection of flying dust, preventing the flying dust from entering the air of the production environment and causing pollution, or entering the production equipment and causing malfunctions, thereby improving the environmental friendliness of the technical solution.

[0063] like Figure 1 As shown, the dust removal device 150 further includes: a monitoring component, which is used to monitor the remaining space inside the dust box.

[0064] In this technical solution, the dust removal device 150 also includes a monitoring component, which is used to monitor the remaining space inside the dust box. This setting enables the staff to timely grasp the dust collection situation in the dust box, so that the staff does not need to regularly disassemble the dust box for inspection. When the dust box is almost full, the staff can also clean the dust box in time. This setting reduces the workload of the staff and improves work efficiency.

[0065] like Figure 1 As shown, the monitoring component includes: an infrared distance measuring component, which is used to monitor the dust storage in the dust box; an indicator light, which lights up when the dust storage in the dust box exceeds a threshold.

[0066] In this technical solution, when the internal space of the dust box is insufficient, the indicator light comes on, and the staff is notified to clean the dust box.

[0067] like Figure 1 As shown, the number of the pipe boxes 120 is two, the gas outlet end of the branch pipe 134 is arranged between the two pipe boxes 120, and the number of the gas outlet ends of the branch pipe 134 is two.

[0068] In this technical solution, in an economizer with two pipe boxes 120, the gas outlet end of the branch pipe 134 is arranged between the two pipe boxes 120. The branch pipe 134 has two gas outlet ends and faces the two pipe boxes 120 respectively, so that soot blowing can be performed on the two pipe boxes 120 at the same time.

[0069] like Figure 1 As shown, the disturbance component 130 further includes: a flat nozzle, and the flat nozzle is arranged at the air outlet of the branch pipe 134.

[0070] In this technical solution, the disturbance component 130 also includes a flat nozzle, which can expand the lateral soot blowing range of the branch pipe 134 outlet and increase the soot blowing air pressure, thereby improving the usability of the low-temperature economizer.

[0071] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0072] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0073] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0074] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A low temperature economizer, characterized in that: include: A tube row, wherein the tube row is a serpentine tube row, and the number of the tube row is multiple; a pipe box, wherein a plurality of the pipe rows are arranged longitudinally inside the pipe box; A disturbance component, used to disturb the dust and particulate matter deposited in the pipe box; An air induction device, the air induction device is arranged at the top of the pipe box; A dust removal device is arranged between the air induced device and the pipe box.

2. The low temperature economizer according to claim 1, characterized in that: The longitudinal spacing between the tube rows longitudinally arranged in the tube box is greater than or equal to 116 mm.

3. The low-temperature economizer according to claim 1, characterized in that: The disturbance component comprises: An air compressor, wherein the air compressor is used to provide compressed air; A main pipe, one end of which is connected to the air compressor; a first valve, the first valve being arranged on the mother pipe; The main pipe is connected to the air inlet ends of a plurality of branch pipes, and the air outlet ends of the plurality of branch pipes are longitudinally arranged on one side of the pipe box.

4. The low-temperature economizer according to claim 3, characterized in that: The disturbance component also includes: A filter element is arranged on the main pipe and is used for filtering compressed air.

5. The low-temperature economizer according to claim 3, characterized in that: The disturbance component also includes: The second valves are arranged on the branch pipes. The number of the second valves corresponds to the number of the branch pipes.

6. The low temperature economizer according to claim 1, characterized in that: The dust removal device comprises: A discharge electrode, the discharge electrode is used to make the fly ash carry electric charge; A dust suction electrode, the dust suction electrode is used to absorb the flying dust carrying the charge; A dust collecting box is used to collect flying dust.

7. The low-temperature economizer according to claim 6, characterized in that: The dust removal device also includes: A monitoring component is used to monitor the space margin inside the dust box.

8. The low-temperature economizer according to claim 7, characterized in that: The monitoring components include: An infrared distance measuring component, wherein the infrared distance measuring component is used to monitor the amount of dust in the dust collecting box; The indicator light is on when the dust storage in the dust box exceeds a threshold value.

9. The low temperature economizer according to claim 3, characterized in that: The number of the pipe boxes is two, the gas outlet end of the branch pipe is arranged between the two pipe boxes, and the number of the gas outlet ends of the branch pipe is two.

10. The low temperature economizer according to claim 3, characterized in that: The disturbance component also includes: A flat nozzle is arranged at the air outlet of the branch pipe.

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