CN101497086B - High-pressure water descaling system - Google Patents
High-pressure water descaling system Download PDFInfo
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- CN101497086B CN101497086B CN2009101033251A CN200910103325A CN101497086B CN 101497086 B CN101497086 B CN 101497086B CN 2009101033251 A CN2009101033251 A CN 2009101033251A CN 200910103325 A CN200910103325 A CN 200910103325A CN 101497086 B CN101497086 B CN 101497086B
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Abstract
The invention belongs to the technical field of separating operation, and relates to a high pressure water descaling system of a hot rolling workshop. The main equipment comprises constant speed pumps, an outlet valve and an inlet valve, and a low pressure water source a is connected into the constant speed pumps and a variable speed pump from the inlet valve through a main water inlet pipe; outlets of the constant speed pumps and the variable speed pump are connected with a main water outlet pipe through an outlet non-return valve and the outlet valve; the outlet of each pump is connected with a minimum flow valve; one end of an accumulator is connected with a high pressure air compressor, while the other end is connected with the main water outlet pipe through a lowest liquid elevating valve; and the main water outlet pipe is connected with a descaling user b through a descaling valve. The invention combines the constant speed pumps and the variable speed pump, the system is provided with one variable speed pump, other pumps adopt conventional constant speed pumps which can operate in high efficiency close to rated conditions, and the variable speed pump and the accumulator mainly mediate the fluctuation of descaling water amount, so the system reduces energy and consumption and can efficiently control investment. The speed regulation mode adopts a variable frequency or hydraulic mode. The system can be widely applied to steel billet descaling systems.
Description
Technical field
The invention belongs to technical field of separating operation, relate to a kind of high-pressure water descaling system of hot rolling workshop.
Background technology
The metallurgical hot rolling workshop of China substantially all adopts water under high pressure that steel billet is carried out de-scaling at present, and most constant speed descaling pumps that adopt are called conventional constant speed descaling system in the descaling system; Minority hot rolling workshop descaling pump all adopts governor impeller, is called full speed governing descaling system.Conventional constant speed descaling system energy consumption is big, investment is low, and full speed governing descaling system energy consumption is low, investment is high.
Goal of the invention
The purpose of this invention is to provide a kind of high-pressure water descaling system.Solve further problem of energy saving in the prior art.Capital equipment comprises constant speed pump, outlet valve and inlet valve, and low pressure water source a inserts constant speed pump and governor impeller by the female pipe of water inlet by inlet valve; Constant speed pump is connected main water outlet pipe with the speed governing delivery side of pump by check-valves, outlet valve; Outlet respectively is connected minimum flow valve to constant speed pump with governor impeller, and the minimum flow valve water outlet enters the ditch; Accumulator one end connects High Pressure Air Compressor, and the other end connects main water outlet pipe by minimum page valve, and main water outlet pipe connects de-scaling user b again by Scale removing valve.Adopt the combination of constant speed pump and governor impeller, there is 1 to be adjustable speed water pump in the system, all the other water pumps adopt conventional constant speed pump, a constant speed pump is in standby, constant speed pump is efficiently operation near declared working condition, adjustable speed water pump and accumulator are mainly born the conciliation of de-scaling water yield fluctuation, not only energy-saving and cost-reducing, but also effectively controlled investment.Mode of speed regulation can adopt frequency conversion or fluid power mode.The present invention can be widely used in the descaling of steel stock system.
Description of drawings
Fig. 1 is a system schematic of the present invention.
Among the figure: part 1 is a constant speed pump, and part 2 is a governor impeller, and part 3 is a minimum flow valve, and part 4 is a Scale removing valve, part 5 is an accumulator, and part 6 is a High Pressure Air Compressor, and part 7 is an outlet non-return valve, and part 8 is an outlet valve, part 9 is an inlet valve, and part 10 is the minimum level valve, and part 11 is for being main water outlet pipe, and part 12 is the female pipe of water inlet;
A-low pressure water source; B-de-scaling user.
The specific embodiment
The invention will be further described in conjunction with the accompanying drawings:
Low pressure water source a inserts 3 constant speed pumps 1 and 1 governor impeller 2 by the female pipe 12 of water inlet by inlet valve 9;
The outlet of 3 constant speed pumps 1 and 1 governor impeller 2 is connected main water outlet pipe 11 by outlet non-return valve 7, outlet valve 8; 2 outlets respectively are connected minimum flow valve 3 to constant speed pump 1 with governor impeller, and the minimum flow valve water outlet enters the ditch; Accumulator 5 one ends connect High Pressure Air Compressor 6, and the other end connects main water outlet pipe 11 by minimum level valve 10, and main water outlet pipe 11 connects de-scaling user b again by Scale removing valve 4.
The operation method of high-pressure water descaling system: outlet valve 8, inlet valve 9 and minimum level valve 10 often leave, a constant speed pump 1 is in standby, all the other constant speed pumps 1 are in running status, the switching of its minimum flow valve 3 is opened automatically when temperature is high, is closed automatically when temperature is low by the case temperature control of corresponding constant speed pump 1; When the liquid level of accumulator 5 reaches high water level, the de-scaling water yield hour, during governor impeller 2 beginning reductions of speed, its minimum flow valve 3 is opened, and its outlet non-return valve 7 is closed under differential pressure action, and governor impeller 2 is isolated with high pressure main water outlet pipe 11; Governor impeller 2 is when raising speed, and its minimum flow valve 3 is in opening or opens automatically, and its outlet non-return valve 7 is in closed condition, and when the rotating speed of governor impeller 2 was raised to rated speed, its outlet non-return valve 7 was backed down, and its minimum flow valve 3 is closed automatically.
When the operation constant speed pump need be stopped transport maintenance, standby constant speed pump put into operation; When governor impeller need be stopped transport maintenance, standby constant speed pump put into operation, and this moment, system was in conventional constant speed operational mode.
The descaling pump mode of speed regulation can adopt frequency conversion or hydraulic speed-regulating mode.
By the rotating speed of accumulator liquid level and de-scaling water yield control governor impeller, order is as follows:
Reduction of speed:
Raising speed:
Adopt frequency control way by the de-scaling water pump, actual consumption is analyzed as follows:
For 1 22MPa-350m
3The water pump of/h, rotating speed is 3000 rev/mins under the declared working condition, water pump power output 2100kW, efficient 75%, then motor power output 2800kW; To constant speed pump, be 25MPa-90m by pump minimum discharge operating mode
3During/h, water pump power output 612kW, pump efficiency 34%, the about 1780kW of motor power output then, electric efficiency 85% during the minimum discharge operating mode, then power input to machine 2094kW.To variable frequency pump, press 900 rev/mins of rotating speeds, the minimum discharge operating mode is 1.98MPa-105m
3During/h, water pump power output 57kW, the efficiency of pump 30%, motor power output 190kW then, frequency converter and electric efficiency 30%, then frequency conversion system input power 633KW during the slow-speed of revolution.During the minimum discharge operating mode, variable frequency pump is than the energy-conservation 1460kW of constant speed pump.
System compares with constant speed, and the energy-saving effect of combined system depends mainly on the running time of minimum discharge operating mode, and the time, meropodium energy effect was obvious more more, calculated to produce 4500000 tons of 1800mm hot-strips per year, established 4 22MPa-350m as the constant speed system
3/ h descaling pump, and combined system is provided with 1 variable-frequency control pump, 3 constant speed pumps.When annual net cycle time 6000 hours, wherein minimum operating mode running time was 1000 hours, and two kinds of systems compare, the annual 1460000 degree electricity of saving of combined type descaling system, and by 0.5 yuan of every degree electricity, annual saving 730,000 RMB.
Adopt external import frequency converter as governing system, the combined type descaling system is only higher 3,000,000 yuans than the investment of conventional constant speed descaling system, and funds of throwing 4 years recyclable more.
Adopt external import hydraulic speed-regulating device as governing system, the combined type descaling system is only higher 2,500,000 yuans than the investment of conventional constant speed descaling system, and funds of throwing 3.3 years recyclable more.
After apparatus of the present invention come into operation, can effectively reduce the descaling system energy consumption, newly-built and improvement project are all easily promoted.
Claims (3)
1. the operation method of a high-pressure water descaling system, this high-pressure water descaling system capital equipment comprises constant speed pump (1), outlet valve (8) and inlet valve (9), and low pressure water source (a) inserts constant speed pump (1) and governor impeller (2) by the female pipe of water inlet (12) by inlet valve (9); The outlet of constant speed pump (1) and governor impeller (2) is connected main water outlet pipe (11) by outlet non-return valve (7), outlet valve (8); Outlet respectively is connected minimum flow valve (3) to constant speed pump (1) with governor impeller (2); Accumulator (5) one ends connect High Pressure Air Compressor (6), and the other end connects main water outlet pipe (11) by minimum level valve (10); Main water outlet pipe (11) connects de-scaling user (b) again by Scale removing valve (4); It is characterized in that: outlet valve (8), inlet valve (9) and minimum level valve (10) often leave, and constant speed pump (1) is in running status; When the liquid level of accumulator (5) reaches high water level, the de-scaling water yield hour, during governor impeller (2) beginning reduction of speed, its minimum flow valve (3) is opened, and its outlet non-return valve (7) is closed under differential pressure action, and governor impeller (2) is isolated with the main water outlet pipe (11) of high pressure; Governor impeller (2) is when raising speed, and its minimum flow valve (3) is in opening, and its outlet non-return valve (7) is in closed condition, and when the rotating speed of governor impeller (2) was raised to rated speed, its outlet non-return valve (7) was backed down, and its minimum flow valve (3) is closed automatically.
2. the operation method of high-pressure water descaling system according to claim 1, it is characterized in that: mode of speed regulation adopts frequency conversion or fluid power method.
3. the operation method of high-pressure water descaling system as claimed in claim 1 or 2, it is characterized in that: constant speed pump (1) is in running status, the switching of its minimum flow valve (3) is opened when temperature is high automatically by the case temperature control of corresponding constant speed pump (1), closes automatically when temperature is low.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009101033251A CN101497086B (en) | 2009-03-06 | 2009-03-06 | High-pressure water descaling system |
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| CN2009101033251A CN101497086B (en) | 2009-03-06 | 2009-03-06 | High-pressure water descaling system |
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| CN101497086A CN101497086A (en) | 2009-08-05 |
| CN101497086B true CN101497086B (en) | 2011-06-15 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103302117B (en) * | 2013-06-21 | 2015-09-09 | 上海宝钢节能环保技术有限公司 | A kind of frequency-changing control system of single pump de-scaling and control method thereof |
| CN104741398A (en) * | 2015-04-01 | 2015-07-01 | 山东钢铁股份有限公司 | High-pressure scale removing water system and control method thereof |
| CN106140842B (en) * | 2015-04-27 | 2017-10-27 | 鞍钢股份有限公司 | A kind of full-automatic de-scaling control method of heavy and medium plate mill |
| CN105710143B (en) * | 2016-03-16 | 2018-04-20 | 北京金自能源科技发展有限公司 | A kind of energy-conserving reconstruction method of the hot rolling high-pressure water descaling system based on accumulator and high voltage converter |
| CN113290044B (en) * | 2021-05-24 | 2023-03-28 | 河北宇禾科技有限公司 | Production equipment and process of ribbed cold-rolled steel bar |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1177655C (en) * | 2001-09-20 | 2004-12-01 | 长沙矿山研究院 | High-pressure water thermal-state descaling system of electro-hydraulic control unloading valve |
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- 2009-03-06 CN CN2009101033251A patent/CN101497086B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1177655C (en) * | 2001-09-20 | 2004-12-01 | 长沙矿山研究院 | High-pressure water thermal-state descaling system of electro-hydraulic control unloading valve |
Non-Patent Citations (5)
| Title |
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| JP平3-151106A 1991.06.27 |
| JP特开平10-263630A 1998.10.06 |
| JP特开平7-223016A 1995.08.22 |
| JP特开平9-184485A 1997.07.15 |
| 景有海.关于水泵调速的最佳台数与最大调速范围的探讨.《给出排水》.1992,(第4期),第10-13页. * |
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