Boiler fly ash sampling device

Abstract

The utility model discloses a boiler fly ash sampling device which comprises a feeding pipe and a fly ash collecting tank, the feeding pipe is detachably mounted at the bottom of the steering pipe; the other end of the feeding pipe extends out of the bottom of the steering pipe and is communicated with a fly ash collecting tank pipeline; a first ball valve is arranged on a pipeline through which the fly ash collecting tank is communicated with the feeding pipe; an ash discharging pipe is arranged at the bottom of the fly ash collecting tank; a purging pipe is arranged on the ash discharge pipe; and the purging pipe is communicated with a compressed air generator pipeline. By adopting the device, the boiler fly ash can be automatically sampled, and the sampling operation time is shortened to 3-4 minutes, so that the obtained sample has representativeness, the combustible content can be accurately and quickly detected, and the timeliness of a sampling result is improved. By applying the device, a combustion sampling result with higher timeliness can be obtained, the process operation condition after adjustment can be accurately judged, and the effectiveness and the reliability of a sampling analysis judgment result are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of boiler production, in particular to a boiler fly ash sampling device. BACKGROUND

[0002] The fly ash of a circulating fluidized bed boiler is fine ash particles that enter the tail flue with flue gas after fuel is burned in the boiler furnace, and the mass percentage of unburned carbon in the fly ash is referred to as the fly ash combustible content.

[0003] The fly ash combustible content is a main index for reflecting the economy of boiler combustion. In the daily operation of the boiler, fly ash samples need to be collected daily to determine the fly ash combustible content, so as to monitor the quality of the boiler combustion condition and timely adjust the operation parameters to improve the combustion efficiency of the boiler.

[0004] In the existing production process, there is a lack of effective boiler fly ash sampler, and only manual sampling and analysis can be performed at the flue gas sampling port of the tail flue of the boiler. The existing fly ash sampling operation is complex, the collection efficiency is slow, the sampling time can reach 1h, the sampling work efficiency is low, the flue gas flow speed is relatively fast, the sample obtained at the time point of completing sampling is inconsistent with the sample at the originally planned sampling time point, and the timeliness of the sampling result is poor. At the same time, due to the long sampling time, the sampling port needs to be opened for a long time, which leads to serious flue gas leakage and environmental pollution.

[0005] The information disclosed in the background section is only intended to increase the understanding of the general background of the present application and should not be considered as admitting or implying that the information constitutes prior art in any form. CONTENT OF THE PRESENT INVENTION

[0006] The present application provides a boiler fly ash sampling device, which can quickly realize sampling, has no continuous flue gas leakage, can maintain a clean sampling environment, and improves the timeliness of sampling.

[0007] The present application provides a boiler fly ash sampling device, in which a coal economizer and a flue are connected through a turning pipe, and the device comprises a feeding pipe and a fly ash collection tank.

[0008] The other end of the feeding pipe extends out of the bottom of the turning pipe and is connected with the pipeline of the fly ash collection tank.

[0009] A first ball valve is arranged on the pipeline connecting the fly ash collection tank and the feeding pipe.

[0010] An ash discharge pipe is arranged at the bottom of the fly ash collection tank, a purge pipe is arranged on the ash discharge pipe, and the purge pipe is connected with the pipeline of a compressed air generator.

[0011] A slope surface inclined opening is arranged on the end of the feeding pipe extending into the turning pipe.

[0012] Preferably, the included angle between the slope bevel and the cross section of the feed pipe is 50°.

[0013] Preferably, the first ball valve and the second ball valve are included; the first ball valve is arranged on the pipeline communicated between the feed pipe and the fly ash collection tank; and the second ball valve is arranged on the ash discharge pipe.

[0014] Preferably, the first ball valve is DN40, and the second ball valve is DN25.

[0015] Preferably, the third ball valve is included; and the third ball valve is arranged on the purge pipe.

[0016] Preferably, the diversion pipe seat groove and the feed pipe flange are included; the diversion pipe seat groove is detachably arranged on the bottom of the diversion pipe; and the feed pipe is detachably connected with the diversion pipe seat groove through the feed pipe flange.

[0017] Preferably, the diversion pipe seat groove includes a pipe body and a pipe seat flange; the pipe body is arranged to extend into the diversion pipe; and the pipe seat flange is arranged on the sidewall of the bottom of the pipe body.

[0018] Preferably, the feed pipe is arranged to extend into the pipe body; and the slope bevel extends out of the pipe body.

[0019] Preferably, the economizer is arranged to have the primary air preheater and the secondary air preheater arranged thereon in intervals; and one end of the economizer outside the secondary air preheater is communicated with the diversion pipe.

[0020] Preferably, the included angle between the slope bevel and the cross section of the feed pipe is 50°.

[0021] The application can produce beneficial effects, including:

[0022] 1) The boiler fly ash sampling device provided by the application can realize automatic sampling of boiler fly ash, shorten the sampling operation time to 3-4 minutes, make the obtained sample representative, accurately and quickly detect the combustible content, improve the timeliness of the sampling result, obtain a more timely combustion sampling result by using the device, and be beneficial to accurately judging the running condition of the adjusted process, and improving the effectiveness and reliability of the sampling analysis and judgment result.

[0023] 2) The boiler fly ash sampling device provided by the application has simple structure and is not easy to be blocked, has low maintenance cost of the sampling device, improves the sampling work efficiency, reduces the labor intensity of manual sampling, does not need to open the sampling port for a long time, and is beneficial to improving the sampling environment of the boiler fly ash.

[0024] 3) The boiler fly ash sampling device provided by the application is convenient to install and detach on the flue, can be replaced at any time after wear, does not need to be stopped for maintenance, and does not affect the normal operation of the related equipment for discharging smoke of the boiler. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 The installation state schematic view of the boiler fly ash sampling device in at least one embodiment provided in the present application is shown in the figure.

[0026] Fig. 2 The enlarged schematic view of the boiler fly ash sampling device in at least one embodiment provided in the present application is shown in the figure.

[0027] Legend:

[0028] Economizer 1, flue 2, diversion pipe 11, primary air air preheater 111, secondary air air preheater 112,

[0029] Feed pipe 31, flow guide pipe seat groove 311, pipe seat flange 312, feed pipe flange 313, slope inclined mouth 314,

[0030] First ball valve 321, second ball valve 322, third ball valve 323, fly ash collection tank 33, compressed air generator 4. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0033] Technical means not described in detail in the present application and not used to solve the technical problems of the present application are set according to common knowledge in the art, and various common knowledge setting methods can be implemented.

[0034] Referring to Figs. 1-2 The boiler fly ash sampling device provided in the present application is arranged on the diversion pipe 11 connected with the economizer 1 and the flue 2. The primary air air preheater 111 and the secondary air air preheater 112 are arranged on the side wall of the economizer 1 connected with the economizer 1 and the diversion pipe 11. The specific connection and installation of the economizer 1, the flue 2, the diversion pipe 11, the primary air air preheater 111 and the secondary air air preheater 112 are the same as the prior art, and will not be repeated here.

[0035] The sampling device comprises a flow guide pipe seat groove, a fly ash collection tank, an inlet and outlet pipe, and a back flushing pipe.

[0036] In an embodiment, the flow guide pipe seat groove 311 is arranged at the bottom of the diversion pipe 11 of the secondary air preheater 112, and the sampling pipe 31 is arranged to extend into the flue. The inner diameter of the flow guide pipe seat groove 311 is 50 mm, and the height is 100 mm. The flow guide pipe seat groove 311 comprises a pipe body and a pipe seat flange 312. The pipe body extends into the diversion pipe 11, and the pipe body is installed on the diversion pipe 11 through the pipe seat flange 312. The inlet pipe 31 is arranged to be inserted into the flow guide pipe seat groove 311 and detachably connected with the pipe seat flange 312. After the inlet pipe 31 is inserted into the pipe body, the slope inclined mouth 314 extends out of the pipe body.

[0037] In an embodiment, the inlet pipe 31 is detachably connected with the pipe seat flange 312 through the inlet pipe flange 313, so that the inlet pipe 31 can be replaced after being worn out.

[0038] In an embodiment, the inlet pipe 31 is inserted into the pipe seat flange 312. The inner diameter of the inlet pipe 31 is 40 mm, and the insertion depth of the inlet pipe 31 in the diversion pipe 11 is 400 mm. The slope inclined mouth 314 is arranged on the extended end of the diversion pipe 11 at an angle of 50° with the cross section of the inlet pipe 31, and the slope inclined mouth 314 is arranged to face the windward side of the flue gas. In this way, the proportion of fly ash obtained by sampling is increased, and the sampling amount is increased to meet the sample amount required for subsequent analysis and detection. The slope inclined mouth 314 with the inclined surface can obtain better fly ash collection effect, and the fly ash collection amount is maximized.

[0039] In an embodiment, the pipe body of the inlet pipe 31 comprises an insertion section, a fixed section, and an extended section. The insertion section is arranged to be inserted into the diversion pipe 11 for sampling. The fixed section is fixed to the diversion pipe 11 through the inlet pipe flange 313. The extended section extends out of the diversion pipe 11. A first ball valve 321, a fly ash collection tank 33, and a second ball valve 322 are arranged in sequence on the pipe of the extended section from the diversion pipe 11 to the outside. After the first ball valve 321 is opened and the second ball valve 322 is closed, the fly ash entering the inlet pipe 31 is collected in the fly ash collection tank 33. After the sampling is completed, the first ball valve 321 is closed and the second ball valve 322 is opened, so that the sample fly ash in the fly ash collection tank 33 is discharged, and the sampling is completed.

[0040] In an embodiment, the first ball valve 321 is a DN40 mm ball valve, which can improve the sampling sample collection efficiency.

[0041] In an embodiment, the second ball valve 322 is a DN32 mm ball valve, which can improve the sample discharge efficiency.

[0042] In a specific embodiment, in order to prevent fly ash from blocking the pipeline, a purge pipe is arranged on the side wall of the extended section of the feed pipe 31; a third ball valve 323 is arranged on the purge pipe; the extended end of the purge pipe is connected to the compressed air generator 4; when blockage is likely to occur, the compressed air generator 4 is opened to blow back the compressed air through the feed pipe 31 and its components, thereby avoiding blockage.

[0043] In a specific embodiment, when fly ash is collected, the first ball valve 321 is opened and the second ball valve 322 is closed, which can be suitable for fly ash collection at different time periods. After this setting, the automatic fly ash collection program can be entered, and the automatic collection of fly ash is completed during the flow of flue gas.

[0044] In a specific embodiment, after sampling is completed, the first ball valve 321 is closed and the second ball valve 322 is opened to discharge the sample, thereby preventing fly ash in the fly ash collection tank 33 from being sucked back into the flue, which would result in sampling failure.

[0045] In a specific embodiment, after sampling is completed and the sample has been collected, the fly ash collection tank 33 is emptied, the first ball valve 321 is opened, the second ball valve 322 is closed, the third ball valve 323 is opened, and the compressed air generator 4 is started to blow the components of the feed pipe 31, and then the blow-off device is closed after the pipeline is unblocked.

[0046] Embodiment

[0047] In the following embodiments, the materials and instruments used are obtained from commercial channels unless otherwise specified; the detection methods used are existing methods unless otherwise specified.

[0048] Technical innovation of the fly ash sampling device for 3 boilers in the power station of Yunnan Yuntian Petrochemical Co., Ltd.:

[0049] Before modification: The manual sampling time of fly ash for each boiler was about 1 hour, general operation tickets were required during operation, the sampling port seal cover was removed, the sampling port had a high negative pressure, and the sampling tool was easily sucked into the flue, affecting the normal emission of flue gas.

[0050] After modification: The boiler can realize continuous automatic sampling of fly ash, and the collection of fly ash sample takes 3-4 minutes, and the sampling time is 1 minute, and the sampling efficiency and reliability are greatly improved.

[0051] Conclusion: Through the technical innovation and modification of the fly ash sampling device, not only the timely automatic sampling of the boiler is realized, but also the risk during manual sampling is reduced, and the work efficiency of sampling is improved.

[0052] Although the utility model has been explained in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A boiler fly ash sampling device, in which a coal economizer (1) is connected to a flue through a turning pipe (11), characterized in that, It includes: The feed pipe (31) is detachably installed at the bottom of the diversion pipe (11). The other end of the feed pipe (31) extends out of the bottom of the diversion pipe (11) and is connected with the fly ash collection tank (33) through a pipeline. A first ball valve (321) is arranged on the pipeline connecting the fly ash collection tank (33) and the feed pipe (31). An ash discharge pipe is arranged at the bottom of the fly ash collection tank (33); a purge pipe is arranged on the ash discharge pipe; and the purge pipe is connected with the compressed air generator (4) through a pipeline. A slope bevel (314) is arranged on the end of the feed pipe (31) extending into the diversion pipe (11).

2. The boiler fly ash sampling device of claim 1, wherein, The slope bevel (314) is arranged towards the windward side of the flue gas.

3. The boiler fly ash sampling device of claim 1, wherein, It includes: The first ball valve (321) is arranged on the pipeline connecting the feed pipe (31) and the fly ash collection tank (33); and the second ball valve (322) is arranged on the ash discharge pipe.

4. The boiler fly ash sampling device of claim 3, wherein, The first ball valve (321) is of DN40 type; and the second ball valve (322) is of DN25 type.

5. The boiler fly ash sampling device of claim 1, wherein, It includes: The third ball valve (323) is arranged on the purge pipe.

6. The boiler fly ash sampling device of claim 1, wherein, It includes: The diversion pipe seat groove (311) is detachably installed at the bottom of the diversion pipe (11); and the feed pipe (31) is detachably connected with the diversion pipe seat groove (311) through the feed pipe flange (313).

7. The boiler fly ash sampling device of claim 6, wherein, The diversion pipe seat groove (311) includes:

8. The boiler fly ash sampling device of claim 7, wherein, The feed pipe (31) is inserted into the pipe body; and the slope bevel (314) extends out of the pipe body.

9. The boiler fly ash sampling device of claim 1, wherein, The primary air preheater (111) and the secondary air preheater (112) are arranged on the economizer (1) at intervals; and one end of the economizer (1) outside the secondary air preheater (112) is connected with the diversion pipe (11).

10. The boiler fly ash sampling device of claim 1, wherein, The included angle between the slope bevel (314) and the cross section of the feed pipe (31) is 50°.

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