CN110499168B - Tandem double-element protection raw gas waste heat recovery heat exchanger rising pipe - Google Patents
Tandem double-element protection raw gas waste heat recovery heat exchanger rising pipe Download PDFInfo
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- CN110499168B CN110499168B CN201910916347.3A CN201910916347A CN110499168B CN 110499168 B CN110499168 B CN 110499168B CN 201910916347 A CN201910916347 A CN 201910916347A CN 110499168 B CN110499168 B CN 110499168B
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- 239000007789 gas Substances 0.000 title claims abstract description 95
- 238000011084 recovery Methods 0.000 title claims abstract description 87
- 239000002918 waste heat Substances 0.000 title claims abstract description 85
- 230000000630 rising effect Effects 0.000 title claims abstract description 77
- 239000000571 coke Substances 0.000 claims abstract description 30
- 239000002912 waste gas Substances 0.000 claims description 4
- 230000008859 change Effects 0.000 abstract description 11
- 230000001174 ascending effect Effects 0.000 description 18
- 238000000034 method Methods 0.000 description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 230000001105 regulatory effect Effects 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 10
- 238000001704 evaporation Methods 0.000 description 8
- 230000008020 evaporation Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 238000003763 carbonization Methods 0.000 description 5
- 239000003245 coal Substances 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B27/00—Arrangements for withdrawal of the distillation gases
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B41/00—Safety devices, e.g. signalling or controlling devices for use in the discharge of coke
- C10B41/08—Safety devices, e.g. signalling or controlling devices for use in the discharge of coke for the withdrawal of the distillation gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Coke Industry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention relates to a rising pipe of a tandem double-element protection raw gas waste heat recovery heat exchanger, which comprises a rising pipe (1) of the waste heat recovery heat exchanger, wherein a heat exchange medium pipe is wound on the pipe wall of the rising pipe (1) of the waste heat recovery heat exchanger, the heat exchange medium pipe comprises a heat exchange cold medium inlet (2) and a heat exchange cold medium outlet (3), and a heat exchange cold medium inlet balance valve (12) is arranged at the position of the heat exchange cold medium inlet (2). The invention can adapt to the working conditions of raw gas output and flame drop curve change, the flow is controlled to be constant through the pressure difference of the heat exchange medium inlet of the rising pipe of the waste heat recovery heat exchanger, namely when the raw gas output of the coke oven is large and the heat exchange quantity is large, the pressure difference of the inlet and the outlet of the heat exchange medium is increased, the resistance of the heat exchange medium is reduced and increased, the flow of the rising pipe is caused to have a reduced trend, the balance valve is used for one-way adjustment of the pressure difference, the area of the inlet is increased, the resistance is reduced, and the flow of the rising pipe is stabilized to be constant; and vice versa.
Description
Technical Field
The invention relates to a tandem double-element protection raw gas waste heat recovery heat exchanger riser, which is mainly used for recovering raw gas waste heat of a coke oven and belongs to the technical field of heat exchangers.
Background
The waste heat recovery rising pipe of the raw coke oven gas is being popularized or has been widely applied to waste heat recovery of raw coke oven gas. The coke oven is formed by arranging a plurality of carbonization chambers (hearths), each hearth is provided with one or two ascending pipes, raw coke oven gas obtained by carbonization is sent to the bridge pipe, and after rapid cooling, the raw coke oven gas is sent to the gas collecting pipe. The coke oven raw gas waste heat recovery ascending pipe is the ascending pipe filled with the heat insulation material originally, and is replaced by the coke oven raw gas waste heat recovery ascending pipe which is parallel to the furnace top and connected in parallel with the gas collecting pipe. The coke oven production is intermittent production, each oven coke production process needs to be subjected to a plurality of production processes such as coal adding (loading), heating carbonization, coke making, coke pushing and the like, the coke produced by each oven can form a temperature curve with flame falling temperature change in the production processes such as coal adding (loading), heating carbonization, coke making, coke pushing and the like, namely, the raw gas output and the components change in real time in the coal carbonization process, the change of the heat exchange quantity of the rising pipes of the raw gas waste heat recovery heat exchanger is also caused, the change of the gasification rate of heat exchange medium in the pipes of the raw gas waste heat recovery heat exchanger is further caused, the change of the real-time pressure drop of the heat exchange medium of the rising pipes of the raw gas waste heat recovery heat exchanger is further caused, that is, the heat exchange quantity is increased when the raw gas output is large, the heat extraction quantity in the rising pipes of the waste heat recovery heat exchanger is increased, the water intake quantity is more favorable for waste heat recovery, the actual condition is the change of the heat exchange medium in the rising pipes of the waste gas waste heat recovery heat exchanger in parallel connection is increased, and the pressure difference of the heat recovery medium in the rising pipes of the waste heat recovery heat exchanger is reduced when the pressure of the waste heat recovery medium in the waste heat recovery heat exchanger is increased. Therefore, the bias flow of water (or other heat working media) of the ascending pipe heat exchange medium of the raw gas waste heat recovery heat exchanger connected in parallel is caused, and the waste heat recovery efficiency is reduced.
At present, a method of connecting a series-parallel waste heat recovery heat exchanger ascending pipe outlet pipeline into a group according to a production series is adopted, and then connecting the ascending pipe outlet pipeline into an outlet main pipe in parallel; there are also a series-parallel waste heat recovery heat exchanger riser outlet pipeline which is a group of pipelines which are regulated by regulating valves according to the production series; and an orifice plate is additionally arranged at the inlet and the outlet of the rising pipe of the waste heat recovery heat exchanger to limit the flow, so that the water (or other heat working medium) stabilization effect of the heat exchange medium is formed.
The parallel connection method is adopted according to the production serial sequence, so that the drift problem of water (or other heat working media) of the heat exchange medium is not solved substantially; the scheme of the regulating valve has the actual situation of non-usable on-site unorganized flame, namely the actual working condition does not allow the regulating valve to be added; the adoption of orifice plate flow restriction also does not substantially solve the problem of drift of water (or other hot working medium) of the heat exchange medium.
In addition, the hearth is not allowed to enter water in the life cycle of the coke oven production process, once the hearth enters water, the hearth is damaged, great loss is caused, and hidden danger is brought to safety production.
The current method for controlling the rising pipe of the waste heat recovery heat exchanger to leak water in the hearth adopts a double-layer rising pipe inner wall structure to increase the safety coefficient, and the method can cause high-temperature corrosion damage of jacket metal after the inner cylinder is damaged, so that the method is only a failure delay method in practice, and the fundamental problem is not solved; the method also has a meter control method for monitoring the temperature of the raw gas at the outlet of the rising pipe, and has fatal defects because the actual working condition of the meter line is not allowed on site.
Disclosure of Invention
The invention aims to solve the technical problem of providing a tandem double-element protection raw gas waste heat recovery heat exchanger riser which has balanced flow distribution in a pipe and can cut off water (or other heat working medium) in time once water (or other heat working medium) leaks.
The invention solves the problems by adopting the following technical scheme: a series double-element protection raw gas waste heat recovery heat exchanger rising pipe comprises a waste heat recovery heat exchanger rising pipe, wherein a heat exchange medium pipe (or other devices such as a heat jacket) is wound on the pipe wall of the waste heat recovery heat exchanger rising pipe, the heat exchange medium pipe comprises a heat exchange medium inlet and a heat exchange medium outlet, a first balance valve and a second balance valve are sequentially connected at the heat exchange medium inlet, the first balance valve comprises a first piston valve core, a first balance valve inlet and a first balance valve outlet are respectively arranged at two sides of the first piston valve core, the second balance valve comprises a second piston valve core, a second balance valve inlet and a second balance valve outlet are respectively arranged at two sides of the second piston valve core, the first balance valve outlet is connected with the heat exchange medium inlet, the second balance valve outlet is connected with the first balance valve inlet, the second balance valve inlet is connected with the outer pipeline and connected with a heat exchange medium, the lower end of the first piston type valve core is connected with a first piston cavity, the first piston cavity is provided with a heat exchange medium inlet pressure guiding nozzle, the upper end of the first piston type valve core is connected with a second piston cavity, the second piston cavity is provided with a heat exchange medium outlet pressure guiding nozzle, the upper end of the second piston type valve core is connected with a fourth piston cavity, the fourth piston cavity is provided with a raw gas outlet pressure guiding nozzle, the heat exchange medium pipe is respectively provided with a heat exchange medium inlet pressure guiding port and a heat exchange medium outlet pressure guiding port at positions close to the heat exchange medium inlet and the heat exchange medium outlet, the rising pipe of the waste heat recovery heat exchanger is provided with a raw gas outlet pressure guiding port at positions close to the upper end, the device is characterized in that a heat exchange medium inlet pressure guiding pipe is connected between the heat exchange medium inlet pressure guiding port and the heat exchange medium inlet pressure guiding nozzle, a heat exchange medium outlet pressure guiding pipe is connected between the heat exchange medium outlet pressure guiding port and the heat exchange medium outlet pressure guiding nozzle, and a raw gas outlet pressure guiding pipe is connected between the raw gas outlet pressure guiding port and the raw gas outlet pressure guiding nozzle.
The lower end of the second piston valve core is connected with a third piston cavity, a raw gas inlet pressure guiding nozzle is arranged on the third piston cavity, a raw gas inlet pressure guiding opening is arranged at a position close to the lower end of the waste heat recovery heat exchanger ascending pipe, and a raw gas inlet pressure guiding pipe is connected between the raw gas inlet pressure guiding opening and the raw gas inlet pressure guiding nozzle.
And a one-way valve which is installed in the same direction as the heat exchange medium is arranged at the outlet of the heat exchange medium.
The second piston cavity is internally provided with a first balance spring, and the fourth piston cavity is internally provided with a second balance spring.
The first piston type valve core is provided with a horn mouth with a large lower part and a small upper part.
Compared with the prior art, the invention has the advantages that:
1. the invention can adapt to the working conditions of raw gas output and flame drop curve change, and the flow is controlled constantly or in need through the pressure difference of the heat exchange medium inlet of the rising pipe of the waste heat recovery heat exchanger in the opposite direction, namely when the raw gas output of the coke oven is large and the heat exchange capacity is large, the pressure difference of the inlet and the outlet of the heat exchange medium can be increased, the resistance of the heat exchange medium can be increased, the flow of the rising pipe can be reduced, the balance valve is used for adjusting the pressure difference in the opposite direction, increasing the inlet area, reducing the resistance, stabilizing the flow of the rising pipe to be constant or increasing the flow adjustment, and improving the heat efficiency; vice versa;
2. In the running process of the rising pipe, once the rising pipe heat exchanger fails to cause internal leakage, the pressure difference of a raw gas channel in the rising pipe is increased, the increased pressure difference can enable the valve to cut off the continuous inflow of heat exchange medium of the rising pipe heat exchanger, and the rising pipe is stopped to continue running, so that the coke oven is protected.
Drawings
Fig. 1 is a schematic diagram of an embodiment 1 of a rising pipe of a tandem double-element protection raw gas waste heat recovery heat exchanger.
Fig. 2 is a schematic diagram of an embodiment 2 of a rising pipe of a tandem double-element protection raw gas waste heat recovery heat exchanger.
Wherein:
Rising pipe 1 of waste heat recovery heat exchanger
Heat exchange medium inlet 2
Heat exchange medium outlet 3
Pressure leading port 4 of heat exchange medium inlet
Pressure guiding pipe 5 of heat exchange medium inlet
Pressure leading port 6 of heat exchange medium outlet
Pressure guiding pipe 7 at outlet of heat exchange medium
Raw gas inlet pressure leading port 8
Raw gas inlet pressure guiding pipe 9
Raw gas outlet pressure leading port 10
Raw gas outlet pressure guiding pipe 11
First balancing valve 12
First balance valve inlet 12-1
First balance valve outlet 12-2
First piston type valve core 12-3
First piston chamber 12-4
Pressure guiding nozzle 12-5 for heat exchange medium inlet
Second piston chamber 12-6
First balance spring 12-7
Pressure leading nozzle 12-8 of heat exchange medium outlet
Check valve 13
Second balancing valve 14
Second balance valve inlet 14-1
Second balance valve outlet 14-2
Second piston type valve core 14-3
Third piston chamber 14-4
Raw gas inlet pressure-introducing nozzle 14-5
Fourth piston Cavity 14-6
Second balance spring 14-7
The raw gas outlet is led to the pressure nozzle 14-8.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
Referring to fig. 1, the invention relates to a tandem double-element protection raw gas waste heat recovery heat exchanger ascending pipe, which comprises a waste heat recovery heat exchanger ascending pipe 1, wherein a heat exchange medium pipe (or other devices such as a heat jacket) is wound on the pipe wall of the waste heat recovery heat exchanger ascending pipe 1, the heat exchange medium pipe comprises a heat exchange medium inlet 2 and a heat exchange medium outlet 3, a first balance valve 12 and a second balance valve 14 are sequentially arranged at the heat exchange medium inlet 2, the first balance valve 12 comprises a first piston valve core 12-3, two sides of the first piston valve core 12-3 are respectively provided with a first balance valve inlet 12-1 and a first balance valve outlet 12-2, the second balance valve 14 comprises a second piston valve core 14-3, two sides of the second piston valve core 14-3 are respectively provided with a second balance valve inlet 14-1 and a second balance valve outlet 14-2, the first balance valve outlet 12-2 is connected with the heat exchange medium inlet 2, the second balance valve outlet 14-2 is connected with the first balance valve 12-1, the second balance valve 12-12 is connected with a second piston 12-12, a second piston cavity is connected with a first piston cavity 6-12, a second piston cavity 6 is arranged in the second piston cavity 6-12 is connected with the first piston cavity 6-12, the second piston cavity 6-12 is connected with the first piston cavity 6-12, the second piston cavity is provided with the second piston cavity 6-12 cavity is connected with the second piston cavity 6-12, the second piston cavity is provided with the second piston cavity 6-12 cavity is provided with the second piston cavity 6, the lower end of the second piston valve core 14-3 is connected with a third piston cavity 14-4, the third piston cavity 14-4 is provided with a raw gas inlet leading-in pressure nozzle 14-5, the upper end of the second piston valve core 14-3 is connected with a fourth piston cavity 14-6, a second balance spring 14-7 is arranged in the fourth piston cavity 14-6, the fourth piston cavity 14-6 is provided with a raw gas outlet leading-in pressure nozzle 14-8, the position of the heat exchange medium pipe close to the heat exchange medium inlet 2 and the position of the heat exchange medium outlet 3 are respectively provided with a heat exchange medium inlet leading-in pressure port 4 and a heat exchange medium outlet leading-in pressure port 6, the position of the waste heat recovery heat exchanger ascending pipe 1 close to the upper end and the lower end is respectively provided with a raw gas outlet leading-in pressure port 10 and a raw gas inlet leading-in pressure port 8, a heat exchange medium inlet leading-in pressure pipe 5 is connected between the heat exchange medium inlet leading-in pressure nozzle 4 and the heat exchange medium inlet leading-in pressure 12-5, the heat exchange medium outlet leading-in pressure nozzle 6 is connected with the raw gas inlet leading-in pressure nozzle 7 and the raw gas inlet leading-in pressure nozzle 7 is connected with the raw gas inlet leading-in pressure nozzle 8, and the raw gas inlet leading-in pressure nozzle is connected with the raw gas inlet leading-in pressure nozzle 10 and the raw gas inlet;
The heat exchange medium outlet 3 is provided with a one-way valve 13 which is installed in the same direction as the heat exchange medium, so that the heat exchange medium is prevented from reversely flowing into the coke oven when the continuous operation of the ascending pipe is stopped.
The essence of the binary automatic protection of the rising pipe of the raw gas waste heat recovery heat exchanger is that the rising pipe is regulated and protected through a heat exchange medium inlet balance valve 12, and the regulating and protecting principle is that the heat exchange medium inlet balance valve 12 regulates and controls the flow of the heat exchange medium of the rising pipe 1 of the raw gas waste heat recovery heat exchanger, and the specific control method is as follows:
Setting initial flow, wherein a heat exchange medium inlet pressure leading port 4 is connected with a heat exchange medium inlet pressure leading nozzle 12-5 connected to a first piston cavity 12-4 by a heat exchange medium inlet pressure leading pipe 5, and the pressure P1 is formed in the communicated first piston cavity 12-5; the pressure acting on the lower end face of the first piston type valve core 12-3 is P1;
The heat exchange medium outlet pressure leading port 6 is connected with a heat exchange medium outlet pressure leading nozzle 12-8 on the second piston cavity 12-6 by adopting a heat exchange medium outlet pressure leading pipe 7, a first balance spring 12-7 is arranged in the second piston cavity 12-6, and the sum of the heat exchange medium outlet pressure plus the pressure of the first balance spring 12-7 is P2; the pressure acting on the upper end face of the first piston type valve core 12-3 is P2;
The opening of the piston hole is the same as the set value when p1=p2, that is, the initial flow is set to be a proper ratio value of the water supply flow and the evaporation capacity meeting the heat exchange requirement of the rising pipe 1 of the waste heat recovery heat exchanger, and the operation of the rising pipe 1 of the waste heat recovery heat exchanger can be realized after the opening of the first piston valve core 12-3 is the initial set value;
When the raw gas output changes and the heat exchange evaporation amount of the rising pipe 1 of the waste heat recovery heat exchanger increases based on heat increase in the operation process of the coke oven, the pressure formed in the rising pipe 1 of the waste heat recovery heat exchanger changes, so that the pressure of the heat exchange medium inlet 2 and the pressure of the heat exchange medium outlet 3 in the pressure cavities at the two ends of the first piston valve core 12-3 are unbalanced, P1 is more than P2, at the moment, the first piston valve core 12-3 moves upwards, a horn mouth with a large bottom and a small top is arranged on the first piston valve core 12-3, the opening of the first balance valve 12 is increased in a proportional way by the upward movement of the first piston valve core 12-3, and the flow of heat exchange medium is increased, and at the moment, the rising pipe 1 of the waste heat recovery heat exchanger needs to increase the supply amount of the heat exchange medium to realize the maximization of heat exchange medium exchange, so that the optimal control of the flow of the heat exchange medium is realized;
Conversely, when the raw gas output changes and the heat exchange evaporation amount change of the rising pipe 1 of the waste heat recovery heat exchanger is reduced based on heat reduction in the operation process of the coke oven, the pressure formed in the rising pipe 1 of the waste heat recovery heat exchanger changes, so that the pressure of the heat exchange medium inlet 2 and the pressure of the heat exchange medium outlet 3 in the pressure cavities at the two ends of the first piston valve core 12-3 are unbalanced, P1 is smaller than P2, the first piston valve core 12-3 moves downwards, a horn mouth with a large bottom and a small top is arranged on the first piston valve core 12-3, the opening of the first balance valve 12 is reduced by the downward movement proportion of the first piston valve core 12-3, the flow of heat exchange medium is reduced, and at the moment, the rising pipe 1 of the waste heat recovery heat exchanger needs to reduce the supply amount of the heat exchange medium to realize the maximization of heat extraction efficiency, and thus the optimal control of the flow of the heat exchange medium is realized.
Setting initial flow, wherein a raw gas inlet pressure leading port 8 is connected with a raw gas inlet pressure leading nozzle 14-5 connected with a third piston cavity 14-4 by adopting a raw gas inlet pressure leading pipe 9, and the pressure P3 is formed in the third piston cavity 14-4 communicated with the raw gas inlet pressure leading nozzle; the pressure acting on the lower end face of the second piston type valve core 14-3 is P3;
The raw gas outlet pressure leading port 10 is connected with a raw gas outlet pressure leading nozzle 14-8 connected with a fourth piston cavity 14-6 by adopting a raw gas outlet pressure leading pipe 11, and the pressure P4 is formed in the fourth piston cavity 14-8 communicated with the raw gas outlet pressure leading nozzle (the P4 is usually normal pressure or micro-positive pressure under the normal operation condition);
the opening of the piston hole is the same as the set value when p3=p4, that is, the initial flow is set to be a proper proportion value of the water supply flow and the evaporation capacity meeting the heat exchange requirement of the rising pipe 1 of the waste heat recovery heat exchanger, and the operation of the rising pipe 1 of the waste heat recovery heat exchanger can be realized after the opening of the piston valve core 14-3 of the balance valve is the initial set value;
When the rising pipe 1 of the waste heat recovery heat exchanger leaks, the heat exchange medium of raw gas flowing into the rising pipe 1 of the waste heat recovery heat exchanger is instantaneously vaporized, so that the pressure difference between P3 and P4 is rapidly increased, P3 is less than P4, the second piston valve core 14-3 rapidly moves downwards to a dead point and cannot be recovered, the second balance valve 14 is closed, and the entry of the heat exchange medium in the rising pipe 1 of the waste heat recovery heat exchanger is cut off; the one-way valve 13 arranged at the heat exchange medium outlet 3 of the rising pipe 1 of the waste heat recovery heat exchanger automatically cuts off the reverse flow of the medium at the heat exchange medium outlet 3 into the rising pipe 1 of the waste heat recovery heat exchanger, thereby realizing the control of avoiding the heat exchange medium from flowing into the coke oven in a large quantity.
The balance valve is a principle for solving the flow pressure difference change relation by utilizing the balance principle, and can be changed into a single-ended pressure difference regulating type structure, such as a regulating valve type structure.
Referring to fig. 2, the invention relates to a tandem double-element protection raw gas waste heat recovery heat exchanger ascending pipe, which comprises a waste heat recovery heat exchanger ascending pipe 1, wherein a heat exchange medium pipe (or other devices such as a heat jacket) is wound on the pipe wall of the waste heat recovery heat exchanger ascending pipe 1, the heat exchange medium pipe comprises a heat exchange medium inlet 2 and a heat exchange medium outlet 3, a first balance valve 12 and a second balance valve 14 are sequentially arranged at the heat exchange medium inlet 2, the first balance valve 12 comprises a first piston valve core 12-3, two sides of the first piston valve core 12-3 are respectively provided with a first balance valve inlet 12-1 and a first balance valve outlet 12-2, the second balance valve 14 comprises a second piston valve core 14-3, two sides of the second piston valve core 14-3 are respectively provided with a second balance valve inlet 14-1 and a second balance valve outlet 14-2, the first balance valve outlet 12-2 is connected with the heat exchange medium inlet 2, the second balance valve outlet 14-2 is connected with the first balance valve 12-1, the second balance valve 12-12 is connected with a second piston 12-12, a second piston cavity is connected with a first piston cavity 6-12, a second piston cavity 6 is arranged in the second piston cavity 6-12 is connected with the first piston cavity 6-12, the second piston cavity 6-12 is connected with the first piston cavity 6-12, the second piston cavity is provided with the second piston cavity 6-12 cavity is connected with the second piston cavity 6-12, the second piston cavity is provided with the second piston cavity 6-12 cavity is provided with the second piston cavity 6, the upper end of the second piston valve core 14-3 is connected with a fourth piston cavity 14-6, a second balance spring 14-7 is arranged in the fourth piston cavity 14-6, a raw gas outlet pressure guiding nozzle 14-8 is arranged on the fourth piston cavity 14-6, a heat exchange medium inlet pressure guiding opening 4 and a heat exchange medium outlet pressure guiding opening 6 are respectively arranged at positions close to the heat exchange medium inlet 2 and the heat exchange medium outlet 3, a raw gas outlet pressure guiding opening 10 is arranged at the position close to the upper end of the waste heat recovery heat exchanger ascending pipe 1, a heat exchange medium inlet pressure guiding pipe 5 is connected between the heat exchange medium inlet pressure guiding opening 4 and the heat exchange medium inlet pressure guiding nozzle 12-5, a heat exchange medium outlet pressure guiding pipe 7 is connected between the heat exchange medium outlet pressure guiding opening 6 and the heat exchange medium outlet pressure guiding nozzle 12-8, and a raw gas outlet pressure guiding pipe 11 is connected between the raw gas outlet pressure guiding opening 10 and the raw gas outlet pressure guiding nozzle 14-8;
The heat exchange medium outlet 3 is provided with a one-way valve 13 which is installed in the same direction as the heat exchange medium, so that the heat exchange medium is prevented from reversely flowing into the coke oven when the continuous operation of the ascending pipe is stopped.
The essence of the binary automatic protection of the rising pipe of the raw gas waste heat recovery heat exchanger is that the rising pipe is regulated and protected through a heat exchange medium inlet balance valve 12, and the regulating and protecting principle is that the heat exchange medium inlet balance valve 12 regulates and controls the flow of the heat exchange medium of the rising pipe 1 of the raw gas waste heat recovery heat exchanger, and the specific control method is as follows:
Setting initial flow, wherein a heat exchange medium inlet pressure leading port 4 is connected with a heat exchange medium inlet pressure leading nozzle 12-5 connected to a first piston cavity 12-4 by a heat exchange medium inlet pressure leading pipe 5, and the pressure P1 is formed in the communicated first piston cavity 12-5; the pressure acting on the lower end face of the first piston type valve core 12-3 is P1;
The heat exchange medium outlet pressure leading port 6 is connected with a heat exchange medium outlet pressure leading nozzle 12-8 on the second piston cavity 12-6 by adopting a heat exchange medium outlet pressure leading pipe 7, a first balance spring 12-7 is arranged in the second piston cavity 12-6, and the sum of the heat exchange medium outlet pressure plus the pressure of the first balance spring 12-7 is P2; the pressure acting on the upper end face of the first piston type valve core 12-3 is P2;
The opening of the piston hole is the same as the set value when p1=p2, that is, the initial flow is set to be a proper ratio value of the water supply flow and the evaporation capacity meeting the heat exchange requirement of the rising pipe 1 of the waste heat recovery heat exchanger, and the operation of the rising pipe 1 of the waste heat recovery heat exchanger can be realized after the opening of the first piston valve core 12-3 is the initial set value;
When the raw gas output changes and the heat exchange evaporation amount of the rising pipe 1 of the waste heat recovery heat exchanger increases based on heat increase in the operation process of the coke oven, the pressure formed in the rising pipe 1 of the waste heat recovery heat exchanger changes, so that the pressure of the heat exchange medium inlet 2 and the pressure of the heat exchange medium outlet 3 in the pressure cavities at the two ends of the first piston valve core 12-3 are unbalanced, P1 is more than P2, at the moment, the first piston valve core 12-3 moves upwards, a horn mouth with a large bottom and a small top is arranged on the first piston valve core 12-3, the opening of the first balance valve 12 is increased in a proportional way by the upward movement of the first piston valve core 12-3, and the flow of heat exchange medium is increased, and at the moment, the rising pipe 1 of the waste heat recovery heat exchanger needs to increase the supply amount of the heat exchange medium to realize the maximization of heat exchange medium exchange, so that the optimal control of the flow of the heat exchange medium is realized;
Conversely, when the raw gas output changes and the heat exchange evaporation amount change of the rising pipe 1 of the waste heat recovery heat exchanger is reduced based on heat reduction in the operation process of the coke oven, the pressure formed in the rising pipe 1 of the waste heat recovery heat exchanger changes, so that the pressure of the heat exchange medium inlet 2 and the pressure of the heat exchange medium outlet 3 in the pressure cavities at the two ends of the first piston valve core 12-3 are unbalanced, P1 is smaller than P2, the first piston valve core 12-3 moves downwards, a horn mouth with a large bottom and a small top is arranged on the first piston valve core 12-3, the opening of the first balance valve 12 is reduced by the downward movement proportion of the first piston valve core 12-3, the flow of heat exchange medium is reduced, and at the moment, the rising pipe 1 of the waste heat recovery heat exchanger needs to reduce the supply amount of the heat exchange medium to realize the maximization of heat extraction efficiency, and thus the optimal control of the flow of the heat exchange medium is realized.
Setting initial flow, wherein the pressure acting on the lower end face of the balance valve piston type valve core 12-3 is normal pressure P3;
The raw gas outlet pressure leading port 10 is connected with a raw gas outlet pressure leading nozzle 14-8 connected with a fourth piston cavity 14-6 by adopting a raw gas outlet pressure leading pipe 11, and the pressure P4 is formed in the fourth piston cavity 14-8 communicated with the raw gas outlet pressure leading nozzle (the P4 is usually normal pressure or micro-positive pressure under the normal operation condition);
The opening of the piston hole is the same as the set value when p3=p4, that is, the initial flow is set to be a proper ratio value of the water supply flow and the evaporation capacity meeting the heat exchange requirement of the rising pipe 1 of the heat recovery heat exchanger, and the operation of the rising pipe 1 of the heat recovery heat exchanger can be realized after the opening of the piston valve core 14-3 of the balance valve is the initial set value
When the rising pipe 1 of the waste heat recovery heat exchanger leaks, the heat exchange medium of raw gas flowing into the rising pipe 1 of the waste heat recovery heat exchanger is instantaneously vaporized, so that the pressure of P3 is rapidly increased, P3 is less than P4, the second piston valve core 14-3 rapidly moves downwards to a dead point and cannot be recovered, the second balance valve 14 is closed, and the entry of the heat exchange medium in the rising pipe 1 of the waste heat recovery heat exchanger is cut off; the one-way valve 13 arranged at the heat exchange medium outlet 3 of the rising pipe 1 of the waste heat recovery heat exchanger automatically cuts off the reverse flow of the medium at the heat exchange medium outlet 3 into the rising pipe 1 of the waste heat recovery heat exchanger, thereby realizing the control of avoiding the heat exchange medium from flowing into the coke oven in a large quantity.
The terms "up and down" and "back and forth" as used herein refer to both general terms, and the balancing principle may be a basic principle of communication such as a diaphragm type regulating valve other than a piston type regulating valve.
In addition to the above embodiments, the present invention also includes other embodiments, and all technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.
Claims (3)
1. The utility model provides a series connection binary protection raw gas waste heat recovery heat exchanger tedge which characterized in that: the heat exchange device comprises a waste heat recovery heat exchanger rising pipe (1), a heat exchange medium pipe is wound on the pipe wall of the waste heat recovery heat exchanger rising pipe (1), the heat exchange medium pipe comprises a heat exchange medium inlet (2) and a heat exchange medium outlet (3), a first balance valve (12) and a second balance valve (14) are sequentially arranged at the heat exchange medium inlet (2), the first balance valve (12) comprises a first piston valve core (12-3), a first balance valve inlet (12-1) and a first balance valve outlet (12-2) are respectively arranged at two sides of the first piston valve core (12-3), the second balance valve (14) comprises a second piston valve core (14-3), a second balance valve inlet (14-1) and a second balance valve outlet (14-2) are respectively arranged at two sides of the second piston valve core (14-3), the first balance valve outlet (12-2) is connected with the heat exchange medium inlet (2), the second balance valve outlet (14-2) is connected with the first balance valve (12-1) and the second balance valve (14-3) is connected with a second balance valve (12-4) through an outer pipe, the waste heat recovery heat exchanger comprises a first piston cavity (12-4) and a second piston cavity (12-6) arranged at the upper end of the first piston core (12-3), a waste gas medium outlet pressure guiding nozzle (12-8) arranged at the second piston cavity (12-6), a fourth piston cavity (14-6) connected at the upper end of the second piston core (14-3), a waste gas outlet pressure guiding nozzle (14-8) arranged at the fourth piston cavity (14-6), a heat exchange medium pipe arranged at the position close to the heat exchange medium inlet (2) and the heat exchange medium outlet (3) and provided with a heat exchange medium inlet pressure guiding port (4) and a heat exchange medium outlet pressure guiding port (6) respectively, a waste heat recovery heat exchanger rising pipe (1) arranged at the position close to the upper end and provided with a waste gas outlet pressure guiding port (10), a heat exchange medium inlet pressure guiding nozzle (14-8) connected between the heat exchange medium inlet pressure guiding port (4) and the heat exchange medium inlet pressure guiding nozzle (12-5), a heat exchange medium inlet pressure guiding port (7) connected between the heat exchange medium inlet pressure guiding port (6) and the heat exchange medium outlet (6), a raw coke oven gas outlet pressure guiding pipe (11) is connected between the raw coke oven gas outlet pressure guiding port (10) and the raw coke oven gas outlet pressure guiding nozzle (14-8);
The lower end of the second piston valve core (14-3) is connected with a third piston cavity (14-4), a raw gas inlet pressure guiding nozzle (14-5) is arranged on the third piston cavity (14-4), a raw gas inlet pressure guiding opening (8) is arranged at a position close to the lower end of the rising pipe (1) of the waste heat recovery heat exchanger, and a raw gas inlet pressure guiding pipe (9) is arranged between the raw gas inlet pressure guiding opening (8) and the raw gas inlet pressure guiding nozzle (14-5) in a connecting manner;
The heat exchange medium outlet (3) is provided with a one-way valve (13) which is installed in the same direction with the heat exchange medium.
2. The rising pipe of the tandem double-element protection raw gas waste heat recovery heat exchanger according to claim 1, wherein the rising pipe is characterized in that: a first balance spring (12-7) is arranged in the second piston cavity (12-6), and a second balance spring (14-7) is arranged in the fourth piston cavity (14-6).
3. The rising pipe of the tandem double-element protection raw gas waste heat recovery heat exchanger according to claim 1, wherein the rising pipe is characterized in that: the first piston type valve core (12-3) is provided with a horn mouth with a large lower part and a small upper part.
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| CN201910916347.3A CN110499168B (en) | 2019-09-26 | 2019-09-26 | Tandem double-element protection raw gas waste heat recovery heat exchanger rising pipe |
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| CN210945483U (en) * | 2019-09-26 | 2020-07-07 | 葛霖 | Ascending pipe of serial double-element protection crude gas waste heat recovery heat exchanger |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| AT278862B (en) * | 1967-08-24 | 1970-02-10 | Waagner Biro Ag | Gas heated heat exchanger |
| US4492042A (en) * | 1981-08-28 | 1985-01-08 | Nippon Steel Corporation | Method for drying coking coals to be charged in a coke oven |
| AU2008219347B2 (en) * | 2007-09-28 | 2012-07-12 | Woodside Energy Limited | Linked LNG production facility |
| CN103131432B (en) * | 2013-02-27 | 2014-06-11 | 北京旭阳化工技术研究院有限公司 | Method for recovering waste heat from coke oven raw gas |
| CN104946272B (en) * | 2014-03-28 | 2017-09-26 | 宝山钢铁股份有限公司 | A kind of coal oven dithio-gas waste-heat recovery device and combination two stage heat taking method |
| CN106433695A (en) * | 2016-10-24 | 2017-02-22 | 南京华电节能环保设备有限公司 | Straight fin for coke oven riser raw coke oven gas waste heat recycling heat taking device and heating device |
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| CN210945483U (en) * | 2019-09-26 | 2020-07-07 | 葛霖 | Ascending pipe of serial double-element protection crude gas waste heat recovery heat exchanger |
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