A method for boiling out an economizer using an oil-fired boiler

Abstract

The present invention discloses a method for boiling out an exhaust gas economizer by using an oil-fired boiler, which comprises the following steps: connecting the oil-fired boiler with the exhaust gas economizer; adding medicament into the oil-fired boiler; the liquid medicine generated in the oil-fired boiler circulates between the exhaust gas economizer and the oil-fired boiler through a circulation pipeline; when the liquid level in the oil-fired boiler reaches the set water level, stop adding water into the oil-fired boiler, and at the same time, operate the oil-fired boiler to increase its steam pressure. The liquid medicine heated by the steam enters the exhaust gas economizer through the circulation pipeline to boil out the exhaust gas economizer. The liquid medicine carrying waste after boiling out the exhaust gas economizer then flows back into the oil-fired boiler from the circulation pipeline. When the steam pressure in the oil-fired boiler rises to the set pressure, open the blowdown pipe to discharge the waste floating on the water surface in the oil-fired boiler; drain the water in the oil-fired boiler and the exhaust gas economizer. The present invention can complete the boiling out of the exhaust gas economizer at the shipyard stage, achieving the effect of cleaning the exhaust gas economizer.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding, and particularly relates to a method for boiling out an exhaust gas economizer by using a fuel oil boiler. Background Art

[0002] Before the exhaust gas economizer is put into use, it needs to be boiled out in advance at the dock stage to remove grease and impurities on the tube wall of the water side inside the exhaust gas economizer. However, at the ship dock stage, since the ship diesel engine cannot operate normally, no high-temperature flue gas enters the flue gas side inside the exhaust gas economizer. The exhaust gas economizer cannot implement the boiling out procedure alone due to the lack of a heat source. Summary of the Invention

[0003] In view of this, the present invention provides a method for boiling out an exhaust gas economizer by using a fuel oil boiler to solve the problems existing in the above background art.

[0004] A method for boiling out an exhaust gas economizer by using a fuel oil boiler specifically includes the following steps:

[0005] S1. Connect the fuel oil boiler to the exhaust gas economizer;

[0006] A steam pipe and a water supply pipe are arranged at the top of the fuel oil boiler, a blowdown pipe is arranged at the side, and a first drain pipe is arranged at the bottom; a second drain pipe is arranged at the bottom of the exhaust gas economizer, and the fuel oil boiler is connected to the exhaust gas economizer through a first circulation pipe and a second circulation pipe. One end of the first circulation pipe is connected to the lower part of the fuel oil boiler, and the other end is connected to the lower part of the exhaust gas economizer. One end of the second circulation pipe is connected to the top of the fuel oil boiler, and the other end is connected to the upper part of the exhaust gas economizer; a circulation pump is arranged on the first circulation pipe, and a water supply pump is arranged on the water supply pipe;

[0007] S2. Add a specific amount of medicine into the fuel oil boiler from the manhole;

[0008] S3. After the medicine is added, add water into the fuel oil boiler to generate a medicine solution, and make the medicine solution enter the exhaust gas economizer through the first circulation pipe and then flow back into the fuel oil boiler through the second circulation pipe;

[0009] S4. When the liquid level in the fuel oil boiler reaches the set water level, stop adding water into the fuel oil boiler, and at the same time operate the fuel oil boiler to increase its steam pressure. The medicine solution heated by the steam enters the exhaust gas economizer through the first circulation pipe to boil it out. The medicine solution carrying waste after boiling out the exhaust gas economizer flows back into the fuel oil boiler through the second circulation pipe. When the steam pressure in the fuel oil boiler rises to the set pressure, open the blowdown pipe to discharge the waste floating on the water surface in the fuel oil boiler;

[0010] S5. Repeat steps S3 and S4 until no waste is discharged from the blowdown pipe;

[0011] In S6, open the first drain pipe and the second drain pipe to drain the water in the fuel oil boiler and the exhaust gas economizer.

[0012] Preferably, the specific steps of step S3 are as follows:

[0013] After the chemical agent is added, close the manhole of the fuel oil boiler, open the water supply pipe, start the water supply pump, and add water to the fuel oil boiler.

[0014] After adding water for a certain period of time, open the first circulation pipe and the second circulation pipe, start the circulation pump, so that the chemical solution generated in the fuel oil boiler enters the exhaust gas economizer through the first circulation pipe. When the exhaust gas economizer is filled with the chemical solution, the chemical solution then returns to the fuel oil boiler through the second circulation pipe.

[0015] Preferably, 10 minutes after adding water to the fuel oil boiler, open the first circulation pipe and the second circulation pipe, start the circulation pump, so that the chemical solution generated in the fuel oil boiler enters the exhaust gas economizer through the first circulation pipe.

[0016] Preferably, the amount of the chemical agent added to the fuel oil boiler in step S2 is 1 / 200 of the sum of the volumes of the fuel oil boiler and the exhaust gas economizer.

[0017] Preferably, in step S4, when the steam pressure in the fuel oil boiler rises to 0.3 - 0.4 Mpa, open the blowdown pipe to discharge the waste floating on the water surface in the fuel oil boiler.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. The method of the present invention is simple and convenient to operate. By forming a circulation pipeline between the fuel oil boiler and the exhaust gas economizer, the chemical solution in the fuel oil boiler is sent to the exhaust gas economizer for boiler boiling, and then the chemical solution carrying waste after boiler boiling is returned to the fuel oil boiler from the circulation pipeline, so as to achieve the purpose of cleaning the grease and impurities inside the exhaust gas boiler.

[0020] 2. The method of the present invention can complete the boiler boiling of the exhaust gas economizer at the shipyard dock stage, achieving the effect of cleaning the exhaust gas economizer. This method is simple and effective, and is convenient for the shipyard to operate. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic connection diagram of the fuel oil boiler and the exhaust gas economizer.

[0023] The meanings of the reference numerals in the figure are as follows:

[0024] 1 is a fuel boiler, 2 is an exhaust gas economizer, 3 is a steam pipe, 4 is a water supply pipe, 5 is a blowdown pipe, 6 is a first drain pipe, 7 is a second drain pipe, 8 is a breather pipe, 9 is a first circulation pipe, 10 is a second circulation pipe, 11 is a circulation pump, 12 is a water supply pump, 13 is a liquid level gauge, and 14 is a manhole. Specific embodiments

[0025] In order to better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] It should be clear that the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0027] The present application will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0028] The present invention provides a method for boiling the exhaust gas economizer using a fuel boiler, which specifically includes the following steps:

[0029] S1, connect the fuel boiler 1 to the exhaust gas economizer 2;

[0030] The top of the fuel boiler 1 is provided with a steam pipe 3 and a water supply pipe 4, the side is provided with a blowdown pipe 5, and the bottom is provided with a first drain pipe 6; the bottom of the exhaust gas economizer 2 is provided with a second drain pipe 7, and the upper part is provided with a breather pipe 8. The fuel boiler 1 and the exhaust gas economizer 2 are connected through a first circulation pipe 9 and a second circulation pipe 10. One end of the first circulation pipe 9 is connected to the lower part of the fuel boiler 1, and the other end is connected to the lower part of the exhaust gas economizer 2. One end of the second circulation pipe 10 is connected to the top of the fuel boiler 1, and the other end is connected to the upper part of the exhaust gas economizer 2; a circulation pump 11 is provided on the first circulation pipe 9, and a water supply pump 12 is provided on the water supply pipe 4.

[0031] A steam valve V5 for controlling the on / off of this pipeline is provided on the steam pipe 3;

[0032] A water supply valve V10 for controlling the on / off of this pipeline is provided on the water supply pipe 4;

[0033] A blowdown valve V1 for controlling the on / off of this pipeline is provided on the blowdown pipe 5;

[0034] Valves V12, V13, and V14 for controlling the on / off of this pipeline are provided on the first drain pipe 6, and the first drain pipe 6 discharges the water in the fuel boiler 1 to the outside of the ship;

[0035] The second drain pipe 7 is provided with valves V6, V7, and V9 for controlling the on-off of this pipeline. The second drain pipe 7 discharges the water in the exhaust gas economizer 2 to the outside of the ship's hull.

[0036] One end of the first circulation pipe 9 connected to the fuel boiler 1 is provided with valves V1, and the end connected to the exhaust gas economizer 2 is provided with valves V2. The circulation pump 11 is installed on the pipeline between valves V1 and V2.

[0037] One end of the second circulation pipe 10 connected to the fuel boiler 1 is provided with valves V4, and the end connected to the exhaust gas economizer 2 is provided with valves V3.

[0038] The breather pipe 8 is provided with a valve V8 for controlling the on-off of this pipeline.

[0039] A liquid level gauge 13 for detecting the level inside it is also installed on the fuel boiler 1.

[0040] S2, add a specific amount of medicine into the fuel boiler 1 from the manhole 14 of the fuel boiler 1.

[0041] The input amount of the medicine is determined according to the water injection amount injected into the fuel boiler 1. In this embodiment, the addition amount of the medicine is 1 / 200 of the sum of the volumes of the fuel boiler 1 and the exhaust gas economizer 2, and the medicine is sodium phosphate.

[0042] S3, after the medicine addition is completed, add water into the fuel boiler 1 to generate a medicine solution, and make the medicine solution enter the exhaust gas economizer 2 through the first circulation pipe 9 and then return to the fuel boiler 1 through the second circulation pipe 10.

[0043] Specifically, after the medicine addition is completed, close the manhole of the fuel boiler 1, open the valve V10 of the water supply pipe 4, and start the water supply pump 12 to add fresh water into the fuel boiler 1.

[0044] After adding water for a certain time (such as 10 minutes), open the first circulation pipe 9 and the second circulation pipe 10 (that is, open valves V1, V2, V3, and V4), and start the circulation pump 11 to make the medicine solution generated in the fuel boiler 1 enter the exhaust gas economizer 2 through the first circulation pipe 9. When the exhaust gas economizer 2 is filled with the medicine solution, the medicine solution will return to the fuel boiler 1 through the second circulation pipe 10.

[0045] S4. After the liquid level in the fuel boiler 1 reaches the set water level, stop adding water to the fuel boiler 1 (close the valve V10 of the water supply pipe 4). At the same time, operate the fuel boiler 1 to increase its steam pressure. The liquid medicine heated by the steam enters the waste heat economizer 2 through the first circulation pipe 9 for boiler boiling. After the waste heat economizer 2 finishes boiler boiling, the liquid medicine carrying waste flows back into the fuel boiler through the second circulation pipe 10. When the steam pressure in the fuel boiler 1 rises to the set pressure (such as 0.3 - 0.4 Mpa), open the blowdown pipe (i.e., open the valve V11) to discharge the waste (such as grease, impurities, etc.) floating on the water surface in the fuel boiler 1.

[0046] S5. Repeat steps S3 and S4 until no waste is discharged from the blowdown pipe 5.

[0047] S6. Open the first drain pipe 6 (valves V12, V13, V14) and the second drain pipe 7 (valves V6, V7, V9) to drain the water in the fuel boiler 1 and the waste heat economizer 2.

[0048] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for boiling out an exhaust gas economizer using a fuel oil boiler, characterized in that, Specifically, it includes the following steps: S1. Connect the fuel boiler to the waste gas economizer; A steam pipe and a water supply pipe are provided at the top of the fuel boiler, a blowdown pipe is provided on the side, and a first drain pipe is provided at the bottom; a second drain pipe is provided at the bottom of the waste gas economizer. The fuel boiler and the waste gas economizer are connected by a first circulation pipe and a second circulation pipe. One end of the first circulation pipe is connected to the lower part of the fuel boiler, and the other end is connected to the lower part of the waste gas economizer. One end of the second circulation pipe is connected to the top of the fuel boiler, and the other end is connected to the upper part of the waste gas economizer; a circulation pump is provided on the first circulation pipe, and a water supply pump is provided on the water supply pipe; S2. Add a specific amount of medicine into the fuel boiler through the manhole; S3. After the medicine is added, add water into the fuel boiler to generate a medicine solution, and make the medicine solution enter the waste gas economizer through the first circulation pipe and then flow back into the fuel boiler through the second circulation pipe; S4. When the liquid level in the fuel boiler reaches the set water level, stop adding water into the fuel boiler, and at the same time operate the fuel boiler to increase its steam pressure. The medicine solution heated by the steam enters the waste gas economizer through the first circulation pipe to carry out boiler boiling. After the waste gas economizer is boiled, the medicine solution carrying waste flows back into the fuel boiler through the second circulation pipe. When the steam pressure in the fuel boiler rises to the set pressure, open the blowdown pipe to discharge the waste floating on the water surface in the fuel boiler; S5. Repeat steps S3 and S4 until no waste is discharged from the blowdown pipe; S6. Open the first drain pipe and the second drain pipe to drain the water in the fuel boiler and the waste gas economizer.

2. The method for boiling out an exhaust gas economizer using a fuel oil boiler according to claim 1, characterized in that, The specific steps of step S3 are as follows: After the medicine is added, close the manhole of the fuel boiler, open the water supply pipe, start the water supply pump, and add water into the fuel boiler. After adding water for a certain time, open the first circulation pipe and the second circulation pipe, start the circulation pump, and make the medicine solution generated in the fuel boiler enter the waste gas economizer through the first circulation pipe. When the waste gas economizer is filled with the medicine solution, the medicine solution then flows back into the fuel boiler through the second circulation pipe.

3. The method for boiling out an exhaust gas economizer using a fuel oil boiler according to claim 2, characterized in that, After adding water into the fuel boiler for 10 minutes, open the first circulation pipe and the second circulation pipe, start the circulation pump, and make the medicine solution generated in the fuel boiler enter the waste gas economizer through the first circulation pipe.

4. The method for boiling out an exhaust gas economizer using a fuel oil boiler according to claim 1, characterized in that, The amount of the medicine added into the fuel boiler in step S2 is 1 / 200 of the sum of the volumes of the fuel boiler and the waste gas economizer.

5. The method for boiling out an exhaust gas economizer using a fuel oil boiler according to claim 1, characterized in that, In step S4, when the steam pressure in the fuel boiler rises to 0.3 - 0.4 Mpa, open the blowdown pipe to discharge the waste floating on the water surface in the fuel boiler.

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