CN108061668B - High sulfur coal unit flue gas waste heat utilization is desorption pilot scale test bench in coordination - Google Patents
High sulfur coal unit flue gas waste heat utilization is desorption pilot scale test bench in coordination Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 67
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 36
- 239000011593 sulfur Substances 0.000 title claims abstract description 36
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 239000003546 flue gas Substances 0.000 title claims abstract description 35
- 239000003245 coal Substances 0.000 title claims abstract description 26
- 239000002918 waste heat Substances 0.000 title claims abstract description 26
- 238000011020 pilot scale process Methods 0.000 title claims abstract description 13
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims description 11
- 238000003795 desorption Methods 0.000 title description 2
- 239000000428 dust Substances 0.000 claims abstract description 22
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000010521 absorption reaction Methods 0.000 claims abstract description 20
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 56
- 238000005260 corrosion Methods 0.000 claims description 25
- 230000007797 corrosion Effects 0.000 claims description 25
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 239000004071 soot Substances 0.000 claims description 8
- 230000002195 synergetic effect Effects 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 230000002209 hydrophobic effect Effects 0.000 claims description 4
- 238000011160 research Methods 0.000 abstract description 5
- 239000000779 smoke Substances 0.000 description 28
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
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- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Immunology (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Pathology (AREA)
- Biodiversity & Conservation Biology (AREA)
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- Sampling And Sample Adjustment (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention discloses a pilot-scale test bed for cooperatively removing flue gas waste heat of a high-sulfur coal unit, which comprises a flue, an electric dust removal system, an induced draft fan, a water-water heat exchanger, a circulating pump and a plurality of heat exchange modules, wherein the flue is arranged on the flue; the upstream outlet of the flue is communicated with the downstream inlet of the flue sequentially through the heat release side of each heat exchange module, the electric dust removal system and the induced draft fan, the heat release side outlet of the water-water heat exchanger is respectively communicated with the heat absorption side inlet of each heat exchange module through the circulating pump, the heat absorption side outlet of each heat exchange module is communicated with the heat release side inlet of the water-water heat exchanger, and the test bed is used for carrying out the flue gas waste heat utilization collaborative removal test research of the high-sulfur coal unit.
Description
Technical Field
The invention belongs to the field of industrial smoke exhaust waste heat utilization and environmental protection, and relates to a pilot scale test bed for the synergistic removal of smoke waste heat utilization of a high-sulfur coal unit.
Background
The flue gas waste heat utilization cooperative removal technology taking the flue gas cooler and the electric dust removal as cores is one of the main technologies of ultra-clean emission of the current coal-fired unit, and can effectively improve the electric dust removal efficiency and obviously relieve the SO of the flue gas in the downstream flue 3 The corrosion problem caused by condensation can also reduce the energy consumption of the induced air blower and the water quantity of the wet desulfurization process. At present, a plurality of domestic coal-fired power plants have been subjected to flue gas waste heat utilization, synergistic removal and transformation, and good economic and social benefits are obtained, but the comprehensive popularization of the flue gas waste heat utilization, synergistic removal and transformation has some problems. The main problem is that the flue gas waste heat utilization cooperative removal technology has no application engineering examples of high-sulfur coal units at home and abroad so far, and the existing successful engineering examples are medium-sulfur and low-sulfur coal units. According to investigation and statistics, the sulfur content of the unit coal design of the domestic operation flue gas waste heat utilization cooperative removal technology is not more than 2% and the foreign sulfur content is not more than 1.17% by the end of 2015. The operation experience of the medium-sulfur and low-sulfur coal-fired units is not known, which is suitable for a plurality of high-sulfur coal-fired power plants with sulfur content of 4-8% in China, so that the research of the flue gas waste heat utilization collaborative removal test of the high-sulfur coal-fired units is very necessary to be carried out so as to guide engineering practice.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a pilot test stand for the flue gas waste heat utilization and the co-removal of the high-sulfur coal unit, which is used for carrying out the research of the flue gas waste heat utilization and the co-removal test of the high-sulfur coal unit.
In order to achieve the purpose, the pilot-scale test bed for the flue gas waste heat utilization and the synergistic removal of the high-sulfur coal unit comprises a flue, an electric dust removal system, an induced draft fan, a water-water heat exchanger, a circulating pump and a plurality of heat exchange modules;
the upstream outlet of the flue is communicated with the downstream inlet of the flue through the heat release side of each heat exchange module, the electric dust removal system and the induced draft fan in sequence, the heat release side outlet of the water-water heat exchanger is respectively communicated with the heat absorption side inlet of each heat exchange module through the circulating pump, and the heat absorption side outlet of each heat exchange module is communicated with the heat release side inlet of the water-water heat exchanger.
And sound wave soot blowers are arranged at the outlets of the heat release sides of the heat exchange modules.
The heat absorption side outlet of each heat exchange module is divided into two paths after passing through a pipeline and a pipe, one path is communicated with the heat release side inlet of the water-water heat exchanger through a first adjusting water valve, the other path is communicated with the inlet of a second adjusting water valve, and the heat release side outlet of the water-water heat exchanger is communicated with the inlet of a circulating pump after passing through a pipeline and a pipe through a third adjusting water valve and a second adjusting water valve.
The device also comprises a drainage expansion tank, wherein an outlet of the drainage expansion tank is communicated with an inlet of the circulating pump through a fourth adjusting water valve.
The water temperature sensor is used for detecting the water temperature at the outlet of the circulating pump, and the output end of the first temperature sensor is connected with the control end of the second regulating water valve.
The outlet of the circulating pump is divided into a plurality of paths, one path corresponds to one heat exchange module, each path is communicated with a heat absorption side inlet of the corresponding heat exchange module through a fifth adjusting water valve, a second temperature sensor for detecting the temperature at the heat absorption side outlet of the heat exchange module is arranged at the heat release side outlet of each heat exchange module, the output end of the second temperature sensor is connected with the control end of the corresponding fifth adjusting water valve, and a third temperature sensor is arranged at the upstream outlet of the flue.
The upstream outlet of the flue is provided with a first stop valve, and the downstream inlet of the flue is provided with a second stop valve.
And a water drain valve and a steam exhaust valve are arranged on the outer wall of each heat exchange module.
The heat exchange device comprises a heat exchange module, and is characterized by further comprising four corrosion test modules, wherein the number of the heat exchange modules is 5, the four corrosion test modules respectively correspond to a second group of heat exchange modules, a third group of heat exchange modules, a fourth group of heat exchange modules and a fifth group of heat exchange modules, each corrosion test module comprises three 20G sample tubes, three ND steel sample tubes, three 316L sample tubes and a test piece block, 10 test holes are formed in the side wall of the heat exchange module on the heat release side, the three 20G sample tubes, the three ND steel sample tubes, the three 316L sample tubes and the test piece block are respectively inserted into the test holes, and the 20G sample tubes, the ND steel sample tubes, the 316L sample tubes and the test piece block respectively correspond to one test hole.
And pressure sensors are arranged at the outlets of the heat exchange sides of the heat exchange modules.
The invention has the following beneficial effects:
when the pilot-scale test bed for the flue gas waste heat utilization and the co-removal of the high-sulfur coal unit is specifically operated, flue gas output from the upstream outlet of the flue enters the downstream inlet of the flue after being released by each heat exchange module under the action of the induced draft fan and subjected to electric dust removal by the electric dust removal system, circulating water output from the outlet of the heat release side of the water-water heat exchanger enters the heat release side of the water-water heat exchanger after being absorbed by the heat absorption side of each heat exchange module under the action of the circulating pump, so that the research of the flue gas waste heat utilization and the co-removal test of the high-sulfur coal unit is realized, the operation is simple and convenient, and the method has good engineering application value.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
the system comprises a heat exchange module 1, a water-water heat exchanger 2, a circulating pump 3, an electric dust removal system 4, a draught fan 5, an acoustic wave soot blower 6, a drainage expansion tank 7, a corrosion test module 8, a fifth adjusting water valve 9, a second adjusting water valve 10, a first adjusting water valve 11, a third temperature sensor 12, a pressure sensor 13, a steam discharge valve 14, a water discharge valve 15, a first stop valve 16, a second stop valve 17, a third adjusting water valve 18 and a fourth adjusting water valve 19.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures:
referring to fig. 1, a pilot scale test bed for the flue gas waste heat utilization and the co-removal of a high sulfur coal unit comprises a flue, an electric dust removal system 4, an induced draft fan 5, a water-water heat exchanger 2, a circulating pump 3 and a plurality of heat exchange modules 1; the upstream outlet of the flue is communicated with the downstream inlet of the flue through the heat release side of each heat exchange module 1, the electric dust removal system 4 and the induced draft fan 5 in sequence, the heat release side outlet of the water-water heat exchanger 2 is respectively communicated with the heat absorption side inlet of each heat exchange module 1 through the circulating pump 3, and the heat absorption side outlet of each heat exchange module 1 is communicated with the heat release side inlet of the water-water heat exchanger 2; the outlet of the heat release side of each heat exchange module 1 is provided with an acoustic wave soot blower 6.
The heat absorption side outlet of each heat exchange module 1 is divided into two paths after passing through a pipeline and a pipe, one path is communicated with the heat release side inlet of the water-water heat exchanger 2 through a first adjusting water valve 11, the other path is communicated with the inlet of a second adjusting water valve 10, and the heat release side outlet of the water-water heat exchanger 2 is communicated with the inlet of the circulating pump 3 after passing through a pipeline and a pipe through a third adjusting water valve 18 and the second adjusting water valve 10.
The invention also comprises a hydrophobic expansion tank 7, wherein the outlet of the hydrophobic expansion tank 7 is communicated with the inlet of the circulating pump 3 through a fourth regulating water valve 19; the invention further comprises a first temperature sensor for detecting the water temperature at the outlet of the circulation pump 3, wherein the output end of the first temperature sensor is connected with the control end of the second regulating water valve 10.
The outlet of the circulating pump 3 is divided into a plurality of paths, one path corresponds to one heat exchange module 1, each path is communicated with a heat absorption side inlet corresponding to the heat exchange module 1 through a fifth adjusting water valve 9, a second temperature sensor for detecting the temperature at the heat emission side outlet of each heat exchange module 1 is arranged at the heat emission side outlet of each heat exchange module 1, the output end of the second temperature sensor is connected with the control end corresponding to the fifth adjusting water valve 9, and a third temperature sensor 12 is arranged at the upstream outlet of the flue.
A first stop valve 16 is arranged at the upstream outlet of the flue, and a second stop valve 17 is arranged at the downstream inlet of the flue; a drain valve 15 and a steam exhaust valve 14 are arranged on the outer wall of each heat exchange module 1.
The invention further comprises four corrosion test modules 8, wherein the number of the heat exchange modules 1 is 5, wherein the four corrosion test modules 8 respectively correspond to the second group of heat exchange modules 1, the third group of heat exchange modules 1, the fourth group of heat exchange modules 1 and the fifth group of heat exchange modules 1, each corrosion test module 8 comprises three 20G sample tubes, three ND steel sample tubes, three 316L sample tubes and a test piece block, 10 test holes are formed in the side wall of the heat exchange module 1 on the heat radiation side, the three 20G sample tubes, the three ND steel sample tubes, the three 316L sample tubes and the test piece block are respectively inserted into the test holes, and the 20G sample tubes, the ND steel sample tubes, the 316L sample tubes and the test piece block respectively correspond to one test hole; the outlet of the heat exchange module 1 on the heat release side is provided with a pressure sensor 13.
In the specific operation of the invention, the flue is a 600 MW-level high-sulfur coal-fired unit tail flue, the smoke is extracted from the 600 MW-level high-sulfur coal-fired unit tail flue through the induced draft fan 5, and the smoke returns to the unit tail flue after passing through each heat exchange module 1, the electric dust removal system 4 and the induced draft fan 5. The induced draft fan 5 adopts a centrifugal fan with the negative pressure of 5kPa, the rotating speed can be regulated through a frequency converter, and the smoke flow range is 5000-10000m 3 /h; in order to ensure that the components of the extracted smoke are as consistent as possible with those of the flue, three smoke extraction ports are formed in the wall surface of the vertical section of the flue, and each smoke extraction port extends into the original flue to a certain depth, so that the boundary effect generated by a T-shaped opening in the wall surface is avoided; the first stop valve 16 and the second stop valve 17 are arranged at the smoke exhausting port and the smoke returning port so as to realize the operation and the stop of the pilot test bed in the running process of the unit.
The number of the heat exchange modules 1 is 5, the first three groups of heat exchange modules 1 are horizontally arranged, and the second two groups of heat exchange modules 1 are vertically arranged. The five groups of heat exchange modules 1 cool the flue gas step by step, and the flue gas temperatures of the inlet and the outlet of the heat release side of the five groups of heat exchange modules 1 are 180/140 ℃, 140/120 ℃, 120/105 ℃, 105/95 ℃ and 95/85 ℃ respectively along the flow direction of the flue gas. Each group of heat exchange modules 1 is provided with 8 groups of tube bundles, the materials are respectively 20G, ND steel and 316L steel, the tube diameter phi is 38 multiplied by 5mm, and the heat exchange modules 1 are provided with a water inlet header and a water outlet header; when in implementation, the length of each tube bundle is selected according to the heat exchange quantity. The circulating water in the heat absorption side of the heat exchange module 1 is power plant closed cold water, and the water temperature of the inlet of the heat absorption side of the heat exchange module 1 is 75 ℃. Circulating water enters five groups of heat exchange modules 1 through a circulating pump 3 respectively, and fifth water adjusting valves 9 are arranged at inlets of the five groups of heat exchange modules 1, so that the fifth water adjusting valves 9 can be adjusted according to the smoke temperature at an outlet of a heat release side of the heat exchange modules 1 to control water flow entering an inlet of a heat absorption side of the heat exchange modules 1; in addition, the expansion tank 7 has the functions of water supplementing and pressure stabilizing. The sound wave soot blower 6 blows soot once every 6 hours, and the soot blowing frequency is properly increased in the system starting and stopping stage; when the running resistance of the system is obviously increased, the soot blowing frequency is properly increased.
The two sides of the flue of each heat exchange module 1 are piled to be provided with 10 test holes, wherein 9 test holes are respectively provided with a 20G sample tube, an ND steel sample tube and a 316L sample tube which are 1.5m long, and the number of the 20G, ND steel sample tubes and the 316L sample tubes is three and are detachably communicated with an outlet water header and an inlet water cabinet of the heat exchange module 1. The tenth test hole is provided with the test piece that does not lead to water, and the height of test piece is 3cm to develop the corrosion difference that has water, anhydrous condition in the pipe.
The invention can study the following properties
1) The corrosion rates of the materials of different low-temperature economizer tube groups are studied. Specifically, under the test conditions of smoke temperature of 120 ℃, 105 ℃, 90 ℃ and 85 ℃ and water inlet temperature of 75 ℃, corrosion conditions of 20G, ND steel and 316L pipes and dust accumulation and blockage conditions of the pipe groups under the acid dew point are studied. In the test, the water temperature in the sample tube is stabilized at 75 ℃, the smoke temperature tested by the second temperature sensors corresponding to the heat exchange modules 1 in the groups 2-5 is controlled at 120 ℃, 105 ℃, 90 ℃ and 85 ℃, the temperature points of each second temperature sensor are stably operated for 7 days, 15 days and 30 days, all the sample tubes are replaced on the 8 th day, 16 th day, 31 th day, 45 th day and 60 th day, the water temperature at 75 ℃ and the corrosion test under different smoke temperature conditions are completed, then the metallographic corrosion detection is carried out on the sample tubes, the corrosion rate is calculated, and the comparison is carried out with a test piece.
2) And (5) researching the corrosion rate of electrode wire and electrode plate corrosion in the electric precipitation system 4 under different smoke temperature conditions. Specifically, the smoke temperature of the electric dust removal system 4 is controlled, statistical data is adopted as test boundary conditions for other parameters, tests are carried out under the smoke temperature conditions of the grades of 90 ℃ and 120 ℃, the tests are carried out for one month at each temperature point, the electrode wire and the electrode plate are replaced after the tests are completed, metallographic corrosion detection is carried out on the electrode wire and the electrode plate, the corrosion rate is calculated, and the comparison is carried out with a test piece.
3) Under the different smoke temperature test working conditions, the corrosion condition of each part in the induced draft fan 5 is researched. Specifically, the blades and the casing of the induced draft fan 5 are not replaceable, so that corrosion test under specific parameter conditions cannot be performed. In the test process, the smoke temperature, load, coal quality, sulfur content and SO are adopted 2 Statistical data such as concentration and SO 3 And taking the measurement result as a test boundary condition, allowing the induced draft fan 5 to run for a long time, and after a certain time of running, carrying out metallographic corrosion detection on the impeller and the shell of the induced draft fan 5, and then estimating the respective corrosion rates.
4) Research of SO under different temperature and ash-sulfur ratio conditions 3 Is used for the removal of the carbon dioxide. Specifically, under the working conditions of 105 ℃, 90 ℃ and 85 ℃ flue gas temperature test, SO in flue gas with different ash-sulfur ratios is tested 3 Content of fly ash in high-sulfur flue gas for researching SO 3 Is used for the removal of the carbon dioxide. SO is measured at the inlet of the 1 st group of heat exchange modules 1 and at the outlets of the 3 rd, 4 th and 5 th groups of heat exchange modules 1 simultaneously 3 The concentration and the smoke concentration are measured by requiring smoke temperature and water temperature, and the load and coal quality are stable, and the smoke sample is hermetically stored as a fly ash performance sample after weight measurement.
5) The cooperative dust removal capability of the electric dust removal system 4 under different temperature and ash sulfur ratio conditions is studied. Under the conditions of different coal quality and flue gas temperature, the concentration of inlet smoke dust, the concentration of outlet smoke dust and SO of the electric dust removal system 4 are measured 3 Concentration. SO under different temperature conditions 3 Different condensing rate and SO 3 The amount of condensed and precipitated smoke is different and the influence on specific resistance of smoke is different. At the same SO 3 Under condensation conditions, the influence of different smoke concentrations on the smoke specific resistance is also different. And confirming the optimal outlet temperature of the heat exchange module 1 through the coal with different ash qualities and the measurement results at different temperatures.
6) Investigation of tail flue SO 3 Migration rules along the journey. Specifically, SO at the inlet and outlet of the heat exchange module 1 on the heat release side is tested 3 Concentration and SO at inlet of electric dust removal system 4 3 Concentration and induced draft fan5 SO at the inlet 3 The concentration is adjusted by adjusting the temperature of the flue gas at the outlet of the heat release side of each heat exchange module 1 SO as to study the migration rule of the concentration of SO3 in the actual tail flue.
Claims (8)
1. The pilot scale test bed for the flue gas waste heat utilization and the co-removal of the high sulfur coal unit is characterized by comprising a flue, an electric dust removal system (4), an induced draft fan (5), a water-water heat exchanger (2), a circulating pump (3) and a plurality of heat exchange modules (1);
the upstream outlet of the flue is communicated with the downstream inlet of the flue sequentially through the heat release side of each heat exchange module (1), the electric dust removal system (4) and the induced draft fan (5), the heat release side outlet of the water-water heat exchanger (2) is respectively communicated with the heat absorption side inlet of each heat exchange module (1) through the circulating pump (3), and the heat absorption side outlet of each heat exchange module (1) is communicated with the heat release side inlet of the water-water heat exchanger (2);
the outlet of the heat release side of each heat exchange module (1) is provided with an acoustic wave soot blower (6);
the heat exchange module (1) is characterized by further comprising four corrosion test modules (8), wherein the number of the heat exchange modules (1) is 5, the four corrosion test modules (8) respectively correspond to the second group of heat exchange modules, the third group of heat exchange modules, the fourth group of heat exchange modules and the fifth group of heat exchange modules, each corrosion test module (8) comprises three 20G sample tubes, three ND steel sample tubes, three 316L sample tubes and a test piece block, 10 test holes are formed in the side wall of the heat exchange module (1) on the heat release side, the three 20G sample tubes, the three ND steel sample tubes, the three 316L sample tubes and the test piece block are respectively inserted into the test holes, and the 20G sample tubes, the ND steel sample tubes, the 316L sample tubes and the test piece block respectively correspond to one test hole.
2. The pilot-scale test bed for the flue gas waste heat utilization and co-removal of the high-sulfur coal unit according to claim 1, wherein the heat absorption side outlet of each heat exchange module (1) is divided into two paths after being connected through a pipeline, one path is communicated with the heat release side inlet of the water-water heat exchanger (2) through a first adjusting water valve (11), the other path is communicated with the inlet of a second adjusting water valve (10), and the heat release side outlet of the water-water heat exchanger (2) is communicated with the inlet of the circulating pump (3) after being connected with the second adjusting water valve (10) through a pipeline through a third adjusting water valve (18).
3. The pilot plant for the synergistic removal of flue gas waste heat from a high sulfur coal unit according to claim 2, further comprising a hydrophobic expansion tank (7), wherein the outlet of the hydrophobic expansion tank (7) is communicated with the inlet of the circulating pump (3) through a fourth regulating water valve (19).
4. The pilot plant for the flue gas waste heat utilization and co-removal of a high sulfur coal unit according to claim 2, further comprising a first temperature sensor for detecting the water temperature at the outlet of the circulating pump (3), wherein the output end of the first temperature sensor is connected with the control end of the second regulating water valve (10).
5. The high-sulfur coal unit flue gas waste heat utilization and co-removal pilot scale test bed according to claim 3, wherein the outlets of the circulating pump (3) are divided into a plurality of paths, one path corresponds to one heat exchange module (1), each path is communicated with a heat absorption side inlet of the corresponding heat exchange module (1) through a fifth adjusting water valve (9), a second temperature sensor for detecting the temperature at the heat absorption side outlet of the heat exchange module (1) is arranged at the heat emission side outlet of each heat exchange module (1), the output end of the second temperature sensor is connected with the control end of the corresponding fifth adjusting water valve (9), and a third temperature sensor (12) is arranged at the upstream outlet of the flue.
6. The pilot-scale test bench for the synergistic removal of flue gas waste heat utilization of a high-sulfur coal unit according to claim 1, wherein a first stop valve (16) is arranged at an upstream outlet of a flue, and a second stop valve (17) is arranged at a downstream inlet of the flue.
7. The pilot-scale test bed for the synergistic removal of the flue gas waste heat of the high-sulfur coal unit according to claim 1, wherein a water drain valve (15) and a steam exhaust valve (14) are arranged on the outer wall of each heat exchange module (1).
8. The pilot-scale test stand for the synergistic removal of flue gas waste heat utilization of a high-sulfur coal unit according to claim 1, wherein a pressure sensor (13) is arranged at an outlet of the heat release side of each heat exchange module (1).
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| CN109708134A (en) * | 2018-12-29 | 2019-05-03 | 浙江浙能乐清发电有限责任公司 | Pilot-plant is combined in a kind of recycling of flue gas moisture, UTILIZATION OF VESIDUAL HEAT IN and gas cleaning |
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