CN115876376A - Furnace pressure sampling device and furnace pressure monitoring method for uranium oxide calcining furnace - Google Patents
Furnace pressure sampling device and furnace pressure monitoring method for uranium oxide calcining furnace Download PDFInfo
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- CN115876376A CN115876376A CN202211575560.0A CN202211575560A CN115876376A CN 115876376 A CN115876376 A CN 115876376A CN 202211575560 A CN202211575560 A CN 202211575560A CN 115876376 A CN115876376 A CN 115876376A
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- 238000005070 sampling Methods 0.000 title claims abstract description 186
- 238000001354 calcination Methods 0.000 title claims abstract description 42
- WZECUPJJEIXUKY-UHFFFAOYSA-N [O-2].[O-2].[O-2].[U+6] Chemical compound [O-2].[O-2].[O-2].[U+6] WZECUPJJEIXUKY-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 229910000439 uranium oxide Inorganic materials 0.000 title claims abstract description 34
- 238000012544 monitoring process Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000000523 sample Substances 0.000 claims abstract description 79
- 239000000498 cooling water Substances 0.000 claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000009826 distribution Methods 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 2
- 238000005485 electric heating Methods 0.000 claims 1
- 238000002425 crystallisation Methods 0.000 abstract description 9
- 230000008025 crystallization Effects 0.000 abstract description 9
- 238000009530 blood pressure measurement Methods 0.000 abstract description 4
- 238000010304 firing Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 50
- 239000013078 crystal Substances 0.000 description 27
- 238000004519 manufacturing process Methods 0.000 description 18
- OOAWCECZEHPMBX-UHFFFAOYSA-N oxygen(2-);uranium(4+) Chemical compound [O-2].[O-2].[U+4] OOAWCECZEHPMBX-UHFFFAOYSA-N 0.000 description 11
- FCTBKIHDJGHPPO-UHFFFAOYSA-N uranium dioxide Inorganic materials O=[U]=O FCTBKIHDJGHPPO-UHFFFAOYSA-N 0.000 description 11
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000001099 ammonium carbonate Substances 0.000 description 6
- 235000012501 ammonium carbonate Nutrition 0.000 description 6
- 238000010926 purge Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 240000007643 Phytolacca americana Species 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003758 nuclear fuel Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
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Abstract
A uranium oxide calciner furnace pressure sampling device and a furnace pressure monitoring method relate to the field of calciner furnace pressure measurement. The uranium oxide calciner furnace pressure sampling device comprises a sampling pipe A, a sampling pipe B and a pressure measuring device; the pressure measuring device comprises a water-cooled pressure-sensitive probe, a digital display meter and a cooling water circulation component; the water-cooled pressure-sensitive probe is arranged on the flow dividing port of the sampling pipe B, and the cold water circulation assembly is communicated with the water-cooled pressure-sensitive probe through a water pipe; the digital display meter is electrically connected with the water-cooled pressure-sensitive probe. The utility model provides a uranium oxide calcining furnace pressure monitoring method, is based on uranium oxide calcining furnace pressure sampling device, and in the furnace pressure monitoring process, cold source and circulating pump continuously start, make cooling water circulation flow between the cavity of probe body and cold source, avoid the high temperature burner gas firing to damage the pressure sensing diaphragm to realize the sustainability of monitoring. Compared with the prior art, the invention has the advantages of easy blockage removal and difficult crystallization.
Description
Technical Field
The invention relates to the field of measurement of the furnace pressure of a calcining furnace, in particular to a furnace pressure sampling device and a furnace pressure monitoring method for a uranium oxide calcining furnace.
Background
The furnace gas sampling pipe is an important component for leading out furnace gas in a calcining furnace for pressure measurement of a pressure gauge. In the pressure measuring process of the furnace pressure monitoring equipment, the furnace gas sampling pipe is easy to have the problem of pipeline blockage (caused by accumulation of dust in furnace gas and crystal substances after cooling the furnace gas on the inner wall of the pipeline). In order to solve the problem of pipeline blockage, a common measure is to install a pipeline purging device and use intermittent purging for blockage removal pressure measurement or continuous purging for blockage prevention compensation type pressure measurement.
In the nuclear industry, uranium dioxide (UO) 2 ) Is the front end of nuclear fuel production and has very important strategic position. Uranium dioxide (UO) 2 ) The preparation process of (A) needs to be subjected to calcination, uranium dioxide (UO) 2 ) The furnace gas generated in the calcination process contains ammonia (NH) 3 ) Water vapor (H) 2 O), carbon dioxide (CO) 2 ) And product dust (UO) 2 Powder) which are easily cooled and crystallized (ammonium carbonate crystals and UO as main components of crystals) 2 Powder) to block the furnace gas sampling pipe, so that the furnace pressure monitoring equipment is frequently blocked and basically in a non-usable state. However, due to uranium dioxide (UO) 2 ) The particularity of the preparation process, which requires the isolation of oxygen and the strict control of moisture (UO) during the calcination in the calciner 2 Will be rapidly oxidized into U in the air 3 O 8 ) Therefore, the blockage cannot be cleaned by a common pipeline purging device (the pipeline purging device introduces oxygen or water vapor into the calcining furnace).
The chemical reaction equation of furnace gas cooling crystallization is as follows:
the structure of the existing common furnace pressure sampling device is shown in fig. 6, and the device comprises a gas production pipe 4, a gas valve A5, a gas valve B6 and a differential pressure transmitter 7; the front end of the gas production pipe 4 is connected to a distribution head 101 of the calciner 100 (the calciner is in a cylindrical shape of being laid horizontally, and the distribution head is positioned at one end of the calciner), so that the gas can enter the pipe conveniently; the air valve A5 is connected to the rear end of the gas production pipe 4 and is used for discharging tail gas in the gas production pipe 4 to release pressure; the air valve B6 is arranged on the front end pipe body of the sampling pipe and is used for controlling the on-off of air flow in the gas production pipe 4; the differential pressure transmitter 7 is arranged on the rear end pipe body of the gas production pipe 4 and is used for monitoring and displaying the furnace pressure.
When the furnace pressure sampling device is used for monitoring the furnace pressure of the uranium oxide calcining furnace, the following defects exist:
1. in order to avoid the damage of the differential pressure transmitter caused by the firing of high-temperature furnace gas, the gas production pipe is designed to be long (the length of a gas path from the front end of the gas production pipe to the differential pressure transmitter exceeds 2.5 m), a plurality of bent paths (two right-angle bent paths) are provided, and the pipe diameter is small (the inner diameter is only 8 mm); however, on the premise that the phenomenon of pipe blockage by crystals is inevitable, the pipeline blockage is inevitably increased by sampling the thin, long and multi-bent pipeline design; the reason is that: when high-temperature furnace gas is introduced into the gas production pipe, heat is easily lost along the pipe pass, and the temperature is reduced, so that crystals are precipitated and the pipeline is blocked.
2. Crystals generated by uranium oxide calcining furnace gas are mainly hard ammonium carbonate crystals, and the simplest blockage dredging method is to adopt a rigid rod to poke into a pipe for dredging; however, on one hand, the gas production pipe has more curved paths (the rigid rod cannot pass through a bend), and on the other hand, the gas production pipe is provided with a gas valve (the rigid rod cannot pass through the gas valve), so that the rigid rod cannot be used for plugging; when the blockage is required to be removed, the furnace is only stopped to detach the gas production pipe, water vapor is introduced into the inner hole of the gas production pipe to carry out dredging (the high-temperature water vapor can dissolve ammonium carbonate crystals), the dredging time is as long as 1-2h, the gas production pipe needs to be installed back after the dredging is finished, time and labor are wasted, and the production progress is influenced;
3. the pipeline inside the differential pressure transmitter is horizontally arranged, so that crystals are deposited and accumulated in the pipeline very easily, and the pipeline is blocked only by 2-5 hours in the using process, so that the pressure cannot be transmitted to the pressure gauge inside the differential pressure transmitter.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a furnace pressure sampling device and a furnace pressure monitoring method for a uranium oxide calcining furnace, and solves the problem that the conventional furnace pressure sampling device is not suitable for monitoring the furnace pressure of the uranium oxide calcining furnace.
The technical scheme of the invention is as follows: the device comprises a uranium oxide calciner furnace pressure sampling device, a distribution head and a control system, wherein the calciner furnace pressure sampling device is applied to a calciner for calcining uranium oxide; the sampling device comprises a sampling pipe A, a sampling pipe B and a pressure measuring device; the sampling pipe A is a straight pipe which is vertically and obliquely arranged, the lower port of the sampling pipe A is movably connected to a distribution head of the calcining furnace, the upper port of the sampling pipe A is movably connected with a plug, and the middle pipe body of the sampling pipe A is provided with an intersection port; the sampling tube B is a straight tube which is vertically and obliquely arranged, the upper port of the sampling tube B is fixedly connected to the intersection port of the sampling tube A and is communicated with the inner hole of the sampling tube A, the lower port of the sampling tube B is movably connected with a plug, and a middle tube body of the sampling tube B is provided with a branch port which vertically extends upwards; the pressure measuring device comprises a water-cooled pressure-sensitive probe, a digital display meter and a cooling water circulation component; the water-cooled pressure-sensitive probe is arranged on the flow dividing port of the sampling pipe B, and the cold water circulation assembly is communicated with the water-cooled pressure-sensitive probe through a water pipe; the digital display meter is electrically connected with the water-cooled pressure-sensitive probe.
The further technical scheme of the invention is as follows: the inclination angle of the sampling tube A relative to the horizontal plane is 40-50 degrees, and the inclination angle of the sampling tube B relative to the horizontal plane is 40-50 degrees.
The invention further adopts the technical scheme that: the inclination angle of sampling pipe A for the horizontal plane is 45, and the inclination angle of sampling pipe B for the horizontal plane is 45, and sampling pipe A and sampling pipe B projection mutually perpendicular on the horizontal plane, the incline direction of sampling pipe A deviation to the calciner outside.
The further technical scheme of the invention is as follows: the sampling pipe A is a split type two-section pipe and comprises a lower pipe body, a threaded joint and an upper pipe body which are sequentially connected; the lower end of the lower pipe body is detachably connected to a distribution head of the calcining furnace, and the upper end of the lower pipe body is provided with an external thread A; the upper end of the upper pipe body is movably connected with a plug, and the lower end of the upper pipe body is provided with an external thread B; the threaded connector comprises a hoop A and a hoop B, both the hoop A and the hoop B are tubular with two open ends, the hoop A comprises a first internal thread pipe section and a second internal thread pipe section which are communicated in sequence, and the hoop B comprises an external thread pipe section and a third internal thread pipe section which are communicated in sequence; the hoop A is in threaded connection with the external thread pipe section of the hoop B through a second internal thread pipe section, the hoop A is in threaded connection with the external thread A of the lower pipe body through a first internal thread pipe section, and the hoop B is in threaded connection with the external thread B of the upper pipe body through a third internal thread pipe section;
correspondingly, the intersection port is arranged in the middle of the upper pipe body.
The further technical scheme of the invention is as follows: the water-cooled pressure-sensitive probe comprises a probe body and a pressure-sensitive film; the probe comprises a probe body, wherein the lower end of the probe body is provided with external threads A, the end surface of the upper end of the probe body is provided with a cooling water inlet, a cooling water outlet and a data line interface, a cavity for containing cooling water is arranged in the probe body, a hollow pipe for passing through a lead is arranged in the cavity, two ends of the hollow pipe are respectively abutted against the cavity walls at two ends of the cavity, so that an inner hole of the hollow pipe is not communicated with the cavity of the probe body, the cooling water inlet and the cooling water outlet are communicated with the cavity, and the data line interface is communicated with the inner hole of the hollow pipe; the pressure sensing diaphragm comprises a diaphragm and a lead, the diaphragm is fixedly connected to the lower end face of the probe body, one end of the lead is connected to the diaphragm, and the other end of the lead penetrates through the wall face of the lower end of the probe body, enters an inner hole of the hollow pipe, extends upwards and is connected to the data line interface;
correspondingly, an internal thread A matched with the external thread A on the probe body is arranged in the shunting port of the sampling tube B, and the water-cooled pressure-sensitive probe is connected to the internal thread A of the sampling tube B through the external thread A in a threaded manner;
correspondingly, the digital display meter is electrically connected with a data line interface of the water-cooled pressure-sensitive probe through a data line.
The further technical scheme of the invention is as follows: the cooling water circulation component comprises a circulation pump and a cold source; two ends of the circulating pump are respectively communicated to a cooling water inlet of the water-cooled pressure-sensitive probe and a cooling water outlet of the water-cooled pressure-sensitive probe through water channels; the cold source exchanges heat with the cooling water in the waterway pipeline so as to continuously reduce the temperature of the cooling water.
The further technical scheme of the invention is as follows: the inner diameter of the sampling tube A is 18-22mm, and the inner diameter of the sampling tube B is 18-22 mm; the length of the sampling tube A is 60cm, and the length of the sampling tube B is 120cm; in sampling pipe A, the length ratio of upper portion body and lower part body is 2:4.
the further technical scheme of the invention is as follows: the sampling device also comprises a heating wire; and the two groups of heating wires are respectively wound on the pipe wall of the upper pipe body of the sampling pipe A and the pipe wall of the sampling pipe B in a spiral way and are respectively and electrically connected with an external power supply.
The further technical scheme of the invention is as follows: the hollow tube both sides in the probe body cavity are equipped with the baffle, form the UNICOM clearance between baffle and the probe body cavity diapire, and the baffle is the feed liquor chamber and goes out the liquid chamber with the cavity separation of probe body, and the feed liquor chamber communicates with the cooling water entry, goes out the liquid chamber and communicates with the cooling water export, and the feed liquor chamber only communicates through the UNICOM clearance with going out the liquid chamber.
The technical scheme of the invention is as follows: a furnace pressure monitoring method of a uranium oxide calcining furnace is based on the furnace pressure sampling device of the uranium oxide calcining furnace; the method comprises the following steps: when the calcining furnace works, high-temperature furnace gas is discharged through a distribution head of the calcining furnace, and acts on the pressure sensing film through the sampling pipe A, the sampling pipe B and the shunt port in sequence; the pressure sensing diaphragm generates slight deformation under the pressure of furnace gas, and generates electric signals with different intensities based on the difference of deformation, so that the furnace gas pressure is converted into the electric signals, and the electric signals are read through a digital display meter, namely, the furnace pressure monitoring is realized; in the furnace pressure monitoring process, the cold source and the circulating pump are continuously started, so that cooling water circularly flows between the cavity of the probe body and the cold source, the cooling water absorbs heat in the cavity of the probe body, the heat is dissipated in the cold source, and the cold quantity is acquired, so that the high-temperature furnace gas is prevented from burning to damage the pressure sensing film, and the monitoring sustainability is realized.
Compared with the prior art, the invention has the following advantages:
1. easy unblocking: the sampling pipe A and the sampling pipe B are designed to be mutually communicated in an intersecting manner, on one hand, the sampling pipe A and the sampling pipe B are straight pipes, on the other hand, the upper port of the sampling pipe A and the lower port of the sampling pipe B can be opened by respectively disassembling plugs, and on the other hand, valves are not arranged on the sampling pipe A and the sampling pipe B; based on the 3-point characteristic, a structural foundation for easy blockage removal operation is provided for the sampling device. When the sampling pipe A and/or the sampling pipe B are blocked, the outer wall of the pipe is knocked by a hard object, so that the attached crystal on the inner wall of the pipe can be knocked down, the knocked-down crystal can be quickly discharged out of the pipeline, and the smoothness of furnace gas cannot be influenced. And the crystal on the inner wall of the sampling pipe A is discharged from the lower port of the sampling pipe A and directly falls into the calcining furnace, and the crystal on the inner wall of the sampling pipe B is discharged from the lower port of the sampling pipe B, enters an open water tank and is dissolved in water.
2. Difficult crystallization:
2.1, a water-cooled pressure-sensitive probe is designed, when the water-cooled pressure-sensitive probe works, the cold water circulation assembly can continuously take away the internal heat, the pressure-sensitive membrane is effectively prevented from being burnt and damaged by high-temperature furnace gas, and the heat resistance of the water-cooled pressure-sensitive probe is equivalently improved; on the premise, the pipe diameters of the sampling pipe A and the sampling pipe B can be designed into thicker pipe shapes (the pipe diameter is increased from 8mm to 18-22 mm), shorter pipe shapes (the length of an air path from a lower port of the sampling pipe A to a shunting port of the sampling pipe B does not exceed 1.6 m), and less bent pipe shapes (only existing at the intersection of the sampling pipe A and the sampling pipe B). The sampling pipe with thicker, shorter and less bent paths is adopted, so that the cross section flow of the high-temperature furnace gas in the sampling pipe can be increased, and the moving path of the high-temperature furnace gas along the sampling pipe is shortened. When high-temperature furnace gas is introduced into the gas production pipe, the heat loss along the pipe pass is relatively less, and the temperature drop amplitude along the pipe pass is smaller, so that the phenomenon of crystallization and sedimentation is greatly reduced.
2.2, sampling pipe A and sampling pipe B are the straight tube of slope arrangement, and the pipeline/pipe section of comparing the horizontal arrangement on the sampling pipe B is difficult for the crystallization, and it peels off under the vibrations to strike outside more easily after the crystallization.
The invention is further described below with reference to the figures and examples.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an exploded view of sampling tube A;
FIG. 3 is a schematic diagram showing the spatial relationship between the sampling tube A and the sampling tube B;
FIG. 4 is a schematic structural diagram of a water-cooled pressure-sensitive probe;
FIG. 5 is a left side view of FIG. 4;
fig. 6 is a schematic structural diagram of a furnace pressure sampling device of a conventional uranium oxide calciner.
Illustration of the drawings: a sampling tube A1; a lower pipe body 11; an upper tube body 12; a ferrule A13; a first internally threaded tube segment 131; a second internally threaded tube segment 132; a ferrule B14; an externally threaded pipe section 141; a third internally threaded tube segment 142; a sampling tube B2; a diversion port 21; a probe body 31; external threads a311; a cooling water inlet 312; a cooling water outlet 313; a data line interface 314; a hollow tube 315; a baffle 316; a liquid inlet chamber 317; an effluent chamber 318; a communication gap 319; a pressure-sensitive film 32; a digital display meter 33; a circulation pump 34; a cold source 35; a gas production pipe 4; an air valve A5; an air valve B6; a differential pressure transmitter 7; a calciner 100; a dispensing head 101; and a plug 200.
Detailed Description
Example 1:
as shown in fig. 1-5, the sampling device for the furnace pressure of the uranium oxide calciner is applied to the calciner for calcining uranium oxide, the calciner is in a cylindrical shape of being laid horizontally, and one end of the calciner is provided with a distribution head for outputting furnace gas.
The furnace pressure sampling device of the uranium oxide calcining furnace comprises a sampling pipe A1, a sampling pipe B2 and a pressure measuring device.
Sampling pipe A1 is the straight tube that vertical slope arranged, and sampling pipe A is split type two-section pipe, and it is including the lower part body 11, upper portion body 12 and the screwed joint that connect gradually. The lower end of the lower pipe body 11 is detachably connected to a distribution head 101 of the calciner 100 through a flange, and the upper end of the lower pipe body 11 is provided with an external thread A. The upper end of the upper pipe body 12 is movably connected with a plug 200, the lower end of the upper pipe body 12 is provided with an external thread B, and the middle of the upper pipe body 12 is provided with an intersection port. The threaded connector comprises a hoop A13 and a hoop B14, wherein the hoop A13 and the hoop B14 are both in a tube shape with two open ends, the hoop A13 comprises a first internal thread pipe section 131 and a second internal thread pipe section 132 which are communicated in sequence, and the hoop B14 comprises an external thread pipe section 141 and a third internal thread pipe section 142 which are communicated in sequence. The ferrule a13 is screwed to the male screw section 141 of the ferrule B14 via the second female screw section 132, the ferrule a13 is screwed to the male screw a of the lower tube body 11 via the first female screw section 131, and the ferrule B14 is screwed to the male screw B of the upper tube body 12 via the third female screw section 142.
Sampling pipe B2 is the straight tube that vertical slope arranged, its upper end mouth fixed connection on sampling pipe A1's the mouth that intersects and with sampling pipe A1's hole intercommunication, its port swing joint has end cap 200 down, is equipped with the vertical branch port 21 that upwards stretches out on its middle part body, is equipped with internal thread A in the branch port 21, and branch port 21 specifically establishes the position that the port is 1/5 sampling pipe B2 total pipe length under apart from sampling pipe B2.
The pressure measuring device comprises a water-cooled pressure-sensitive probe, a digital display meter 33 and a cooling water circulation assembly. The water-cooled pressure-sensitive probe includes a probe body 31 and a pressure-sensitive membrane 32. The lower end of the probe body 31 is provided with external threads A311, the upper end face of the probe body is provided with a cooling water inlet 312, a cooling water outlet 313 and a data line interface 314, a cavity for containing cooling water is formed in the probe body 31, a hollow tube 315 for passing through a lead is arranged in the cavity, two ends of the hollow tube 315 are respectively abutted against the cavity walls at two ends of the cavity, so that the inner hole of the hollow tube 315 is not communicated with the cavity of the probe body 31, the cooling water inlet 312 and the cooling water outlet 313 are communicated to the cavity, and the data line interface 314 is communicated to the inner hole of the hollow tube 315. The pressure sensing diaphragm 32 comprises a diaphragm and a wire, the diaphragm is fixedly connected to the lower end face of the probe body 31, one end of the wire is connected to the diaphragm, and the other end of the wire penetrates through the lower end wall face of the probe body 31, enters the inner hole of the hollow tube 315, extends upwards and is connected to the data line interface 314. The water-cooled pressure-sensitive probe is in threaded connection with the internal thread A of the branch opening 21 of the sampling tube B2 through the external thread A311 of the probe body 31. The digital display meter 33 is electrically connected with the data line interface 314 of the water-cooled pressure-sensitive probe through a data line. The cooling water circulation assembly includes a circulation pump 34 and a cool source 35. Both ends of the circulation pump 34 are respectively communicated to the cooling water inlet 312 of the water-cooled pressure-sensitive probe and the cooling water outlet 313 of the water-cooled pressure-sensitive probe through water channels. The cold source 35 exchanges heat with the cooling water in the waterway pipeline to continuously reduce the temperature of the cooling water.
Preferably, baffles 316 are arranged on two sides of the hollow tube 315 in the cavity of the probe body 31, a communication gap 319 is formed between the baffles 316 and the bottom wall of the cavity of the probe body 31, the cavity of the probe body 31 is divided into a liquid inlet chamber 317 and a liquid outlet chamber 318 by the baffles 316, the liquid inlet chamber 317 is communicated with the cooling water inlet 312, the liquid outlet chamber 318 is communicated with the cooling water outlet 313, and the liquid inlet chamber 317 is communicated with the liquid outlet chamber 318 only through the communication gap 319. Based on this characteristic, baffle 316 carries out the drainage to the cooling water that gets into in the probe body 31 cavity, ensures that the cooling water flows through probe body 31 cavity bottom region to play better radiating effect to pressure sensing diaphragm 32.
Preferably, the inner diameter of the sampling tube A1 is 20mm, and the inner diameter of the sampling tube B2 is 20mm; the length of the sampling tube A1 is 60cm, and the length of the sampling tube B2 is 120cm. In the sampling tube A1, the length ratio of the upper tube body 12 to the lower tube body 11 is 2:4. sampling pipe A1 is 45 for the inclination of horizontal plane, and sampling pipe B2 is 45 for the inclination of horizontal plane, and sampling pipe A1 and sampling pipe B2 are projection mutually perpendicular on the horizontal plane, and the incline direction of sampling pipe A1 is partial to the calciner outside. Sampling pipe A1 is based on this length and inclination, and its upper end height is comparatively suitable, and operating personnel need not ascend a height alright pull down the end cap of sampling pipe A1 upper end and carry out the stifled operation of expert. If the inclination angle of the sampling pipe A1 is increased to exceed 50 degrees, an operator needs to ascend when the sampling pipe A1 is blocked, and if the inclination angle of the sampling pipe A1 is reduced to be lower than 40 degrees, the phenomenon of sedimentation and crystallization of the inner wall of the pipeline is aggravated. Based on the length and the inclination angle, the inner wall of the sampling pipe B2 is not easy to settle and attach crystals, so that a vertical shunting port is convenient to arrange. If the inclination angle is increased to exceed 50 degrees, the acute angle formed between the sampling tube B2 and the flow distribution port 21 is too small, which is inconvenient for processing and arranging the flow distribution port 21, and if the inclination angle is reduced to exceed 40 degrees, the phenomenon of sedimentation and crystallization of the inner wall of the pipeline is aggravated.
Preferably, the sampling device further comprises a heating wire (not shown in the figure); and the two groups of heating wires are respectively and spirally wound on the pipe wall of the upper pipe body 12 of the sampling pipe A1 and the pipe wall of the sampling pipe B2 and are respectively and electrically connected with an external power supply. The heating wire is used for supplying heat to the upper pipe body 12 of the sampling pipe A1 and the sampling pipe B2 after being electrified, and the upper pipe body 12 of the sampling pipe A1 and the sampling pipe B2 respectively carry out heat radiation to the respective inner pipe cavities, so that heat loss and temperature reduction when furnace gas moves along the pipe cavities are reduced, and the phenomenon of cooling and crystallization of the furnace gas in the pipe cavities is further reduced.
Briefly describing the application of the invention:
the furnace pressure sampling device of the uranium oxide calcining furnace can realize rapid blockage opening, and the practical application is divided into two situations of on-line blockage opening and off-line blockage opening, which are respectively explained.
The on-line blockage removal is carried out in the running process of the calcining furnace, is suitable for the condition that crystals in the tube are less and the tube is not blocked by the crystals and can be implemented by matching a high-temperature-resistant silicon rubber tube and an open water tank.
The operation is as follows:
1. an operator wears the high-temperature-resistant gloves to remove the plug at the lower end of the sampling tube B2, one end of the high-temperature-resistant hose is connected with the lower port of the sampling tube B2, and the other end of the high-temperature-resistant hose is led into the open water tank filled with water;
2. knocking the outer walls of the sampling pipe A1 and the sampling pipe B2 by using an iron chisel, and stripping crystals attached in the pipes by vibration; crystals stripped from the inner wall of the sampling pipe A1 slide downwards along the inner wall of the pipe and return to the interior of the calcining furnace through the distribution head; the crystals stripped from the inner wall of the sampling tube B2 slide down along the inner wall of the tube, enter an open water tank filled with water through a high-temperature-resistant silicon tube, and are dissolved in the water (the main component of the crystals is water-soluble ammonium carbonate crystals) for later recycling or purification treatment.
The off-line blockage removing is carried out after the calcinator is shut down, the off-line blockage removing device is suitable for the situation that the interior of the calcining furnace is more in crystallized substances and is blocked by the crystallized substances, and can be implemented by matching a high-temperature-resistant silicon rubber tube, an open water tank and an iron drill rod.
The operation is as follows:
1. an operator unscrews the threaded connector by using a wrench, and the upper pipe body 12 of the sampling pipe A1 and the sampling pipe B2 are detached together; then respectively detaching the pipe body 12 at the upper part of the sampling pipe A1 and the plugs on the sampling pipe B2; finally, the lower pipe body 11 of the sampling pipe A1 is detached from the distribution head 101 of the calcining furnace 100;
2. respectively inserting an iron drill into inner holes of an upper pipe body 12 of a sampling pipe A1, a lower pipe body 11 of the sampling pipe A1 and an inner hole of a sampling pipe B2, repeatedly inserting and pulling to strip crystals, introducing the stripped crystals into an open water tank filled with water, and dissolving the crystals in the water (the main component of the crystals is water-soluble ammonium carbonate crystals) for later recycling or purification treatment;
3. and introducing water vapor into the inner hole of the preliminarily dredged pipe fitting, and thoroughly dredging the inner hole of the pipe fitting by utilizing the characteristic that ammonium carbonate crystals can be dissolved in water.
Brief description of the invention use of the invention:
the uranium oxide calcining furnace pressure sampling device is used for monitoring the furnace pressure of a uranium oxide calcining furnace, when the calcining furnace works, high-temperature furnace gas is discharged through a distribution head 101 of the calcining furnace 100, and sequentially passes through a sampling pipe A1, a sampling pipe B2 and a shunt port 21 to act on a pressure sensing film 32, the pressure sensing film 32 can generate slight deformation under the furnace gas pressure, electric signals with different intensities can be generated based on the difference of deformation, so that the furnace gas pressure is converted into the electric signals, and the furnace pressure monitoring can be realized by reading the electric signals through a digital display meter 33.
In the process of monitoring the furnace pressure, the cold source 35 and the circulating pump 34 are continuously started, so that cooling water circularly flows between the cavity of the probe body 31 and the cold source, the cooling water absorbs heat in the cavity of the probe body 31, the heat is dissipated in the cold source 35, and the cold energy is acquired, thereby preventing the high-temperature furnace gas from burning and damaging the pressure sensing diaphragm 32.
Claims (10)
1. The uranium oxide calcining furnace pressure sampling device is applied to a calcining furnace for calcining uranium oxide, and a distribution head is arranged at the end part of the calcining furnace; the method is characterized in that: the sampling device comprises a sampling pipe A, a sampling pipe B and a pressure measuring device; the sampling pipe A is a straight pipe which is vertically and obliquely arranged, the lower port of the sampling pipe A is movably connected to a distribution head of the calcining furnace, the upper port of the sampling pipe A is movably connected with a plug, and the middle pipe body of the sampling pipe A is provided with an intersection port; the sampling pipe B is a straight pipe which is vertically and obliquely arranged, the upper port of the sampling pipe B is fixedly connected to the intersection port of the sampling pipe A and is communicated with the inner hole of the sampling pipe A, the lower port of the sampling pipe B is movably connected with a plug, and a branch port which vertically extends upwards is arranged on the middle pipe body of the sampling pipe B; the pressure measuring device comprises a water-cooled pressure-sensitive probe, a digital display meter and a cooling water circulation component; the water-cooled pressure-sensitive probe is arranged on the flow dividing port of the sampling pipe B, and the cold water circulation assembly is communicated with the water-cooled pressure-sensitive probe through a water pipe; the digital display meter is electrically connected with the water-cooled pressure-sensitive probe.
2. The uranium oxide calciner furnace pressure sampling apparatus of claim 1, wherein: the sampling pipe A is a split type two-section pipe and comprises a lower pipe body, a threaded joint and an upper pipe body which are sequentially connected; the lower end of the lower pipe body is detachably connected to a distribution head of the calcining furnace, and the upper end of the lower pipe body is provided with an external thread A; the upper end of the upper pipe body is movably connected with a plug, and the lower end of the upper pipe body is provided with an external thread B; the threaded connector comprises a hoop A and a hoop B, the hoop A and the hoop B are both in a tube shape with two open ends, the hoop A comprises a first internal thread pipe section and a second internal thread pipe section which are communicated in sequence, and the hoop B comprises an external thread pipe section and a third internal thread pipe section which are communicated in sequence; the hoop A is in threaded connection with the external thread pipe section of the hoop B through a second internal thread pipe section, the hoop A is in threaded connection with the external thread A of the lower pipe body through a first internal thread pipe section, and the hoop B is in threaded connection with the external thread B of the upper pipe body through a third internal thread pipe section;
correspondingly, the intersection port is arranged in the middle of the upper pipe body.
3. The uranium oxide calciner furnace pressure sampling apparatus of claim 2, wherein: the water-cooled pressure-sensitive probe comprises a probe body and a pressure-sensitive film; the probe comprises a probe body, wherein the lower end of the probe body is provided with external threads A, the end surface of the upper end of the probe body is provided with a cooling water inlet, a cooling water outlet and a data line interface, a cavity for containing cooling water is arranged in the probe body, a hollow pipe for passing through a lead is arranged in the cavity, two ends of the hollow pipe are respectively abutted against the cavity walls at two ends of the cavity, so that an inner hole of the hollow pipe is not communicated with the cavity of the probe body, the cooling water inlet and the cooling water outlet are communicated with the cavity, and the data line interface is communicated with the inner hole of the hollow pipe; the pressure sensing diaphragm comprises a diaphragm and a lead, the diaphragm is fixedly connected to the lower end face of the probe body, one end of the lead is connected to the diaphragm, and the other end of the lead penetrates through the wall surface of the lower end of the probe body, enters an inner hole of the hollow pipe, extends upwards and is connected to the data line interface;
correspondingly, an internal thread A matched with the external thread A on the probe body is arranged in the shunting port of the sampling tube B, and the water-cooled pressure-sensitive probe is in threaded connection with the internal thread A of the sampling tube B through the external thread A;
correspondingly, the digital display meter is electrically connected with a data line interface of the water-cooled pressure-sensitive probe through a data line.
4. The uranium oxide calciner furnace pressure sampling apparatus of claim 3, wherein: the cooling water circulation component comprises a circulation pump and a cold source; two ends of the circulating pump are respectively communicated to a cooling water inlet of the water-cooled pressure-sensitive probe and a cooling water outlet of the water-cooled pressure-sensitive probe through water channels; the cold source exchanges heat with the cooling water in the waterway pipeline so as to continuously reduce the temperature of the cooling water.
5. The uranium oxide calciner furnace pressure sampling apparatus of claim 4, wherein: the inner diameter of the sampling tube A is 18-22mm, and the inner diameter of the sampling tube B is 18-22 mm; the length of the sampling tube A is 60cm, and the length of the sampling tube B is 120cm; in sampling pipe A, the length ratio of upper portion body and lower part body is 2:4.
6. the uranium oxide calciner furnace pressure sampling apparatus of claim 5, wherein: the inclination angle of the sampling tube A relative to the horizontal plane is 40-50 degrees, and the inclination angle of the sampling tube B relative to the horizontal plane is 40-50 degrees.
7. The uranium oxide calciner furnace pressure sampling apparatus of claim 6, wherein: the inclination angle of sampling pipe A for the horizontal plane is 45, and the inclination angle of sampling pipe B for the horizontal plane is 45, and sampling pipe A and sampling pipe B projection mutually perpendicular on the horizontal plane, the incline direction of sampling pipe A deviation to the calciner outside.
8. The uranium oxide calciner furnace pressure sampling apparatus of claim 7, wherein: the sampling device also comprises an electric heating wire; and the two groups of heating wires are respectively and spirally wound on the pipe wall of the upper pipe body of the sampling pipe A and the pipe wall of the sampling pipe B and are respectively and electrically connected with an external power supply.
9. The uranium oxide calciner furnace pressure sampling apparatus of claim 8, wherein: the hollow tube both sides in the probe body cavity are equipped with the baffle, form the UNICOM clearance between baffle and the probe body cavity diapire, and the baffle is the feed liquor chamber and goes out the liquid chamber with the cavity separation of probe body, and the feed liquor chamber communicates with the cooling water entry, goes out the liquid chamber and communicates with the cooling water export, and the feed liquor chamber only communicates through the UNICOM clearance with going out the liquid chamber.
10. A uranium oxide calciner furnace pressure monitoring method is based on the uranium oxide calciner furnace pressure sampling device of claim 9, and is characterized in that: when the calcining furnace works, high-temperature furnace gas is discharged through a distribution head of the calcining furnace, and acts on the pressure sensing film through the sampling pipe A, the sampling pipe B and the shunt port in sequence; the pressure sensing diaphragm generates slight deformation under the pressure of furnace gas, and generates electric signals with different intensities based on the difference of deformation, so that the furnace gas pressure is converted into the electric signals, and the electric signals are read through a digital display meter, namely, the furnace pressure monitoring is realized; in the furnace pressure monitoring process, the cold source and the circulating pump are continuously started, so that cooling water circularly flows between the cavity of the probe body and the cold source, the cooling water absorbs heat in the cavity of the probe body, the heat is dissipated in the cold source, and the cold quantity is acquired, so that the high-temperature furnace gas is prevented from burning to damage the pressure sensing film, and the monitoring sustainability is realized.
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