Condenser water circulation system of steelmaking RH vacuum furnace

Abstract

The invention relates to a steel-making RH vacuum furnace condenser water circulation system which comprises a condenser, a hot water pool, a filter, a cooling tower and a cold water pool. The condenser is higher than the hot water tank, and condensate water generated by the condenser flows into the hot water tank through gravity; the filter is arranged between the hot water tank and the cooling tower; water in the hot water tank is driven by the upper tower pump to pass through the filter and then enters the cooling tower; water flows into the cold water pool after being cooled by the cooling tower; and water in the cold water pool is driven by a condensation pump and then returns to the condenser. According to the steel-making RH vacuum furnace condenser water circulation system, three lifting pumps are omitted, the cooling water flow of different vacuum furnace working modes is implemented, and the electricity-saving operation power of an upper tower pump is optimized; through on-site actual measurement and calculation, about more than 4,000,000 kilowatt-hour of electricity

Description

Technical Field

[0001] The invention relates to a steelmaking RH vacuum furnace condenser water circulation system, belonging to the technical field of metal smelting equipment. Background Art

[0002] The function of the steelmaking RH vacuum furnace condenser is to cool the high-temperature steam discharged from the compressor into liquid water through cooling water, so that the compressor can evacuate the vacuum furnace to achieve the required vacuum degree. Through the continuous circulation of cooling water, the gas in the vacuum furnace is continuously taken away, thereby achieving the required vacuum degree of the vacuum furnace.

[0003] The existing cooling water circulation process has the problem of high power consumption.

[0004] In the existing cooling water circulation system, there are many water pumps, including lift pumps (the function is to apply power to the water in the condenser and transport it to the hot water pool, waiting for cooling and reuse), tower pumps (the function is to apply power to the water in the hot water pool and pump it to the cooling tower for cooling) and condensation pumps (the function is to transport the cooled water back to the condenser for use). There are three of each type, a total of nine, and two of each type are running during operation, a total of six are in operation. The power of each type is 132Kw, 160Kw and 355Kw respectively, and the actual power consumption of each water pump during operation is 264Kw / h, 320Kw and 710Kw respectively, that is, the power consumption of these three types of six water pumps in operation reaches 1294Kw per hour.

[0005] There are four working modes of vacuum furnace: main treatment (high vacuum requirement), light treatment (medium vacuum requirement), cooling steel in vacuum furnace (low vacuum requirement) and waiting interval (lowest vacuum requirement). All four working modes of vacuum furnace require cooling water. And the cooling water volume in the prior art is set at 2400 cubic meters / h. However, through investigation and experiment, it was found that in the four working modes, the cooling water flow rate can be lower than the cooling water flow rate specified in advance. Otherwise, according to the same cooling water flow rate, the water pump (here is the condensation pump that transports the treated cooling water to the vacuum furnace condenser, two out of three are turned on) requires a lot of power and consumes a lot of electricity.

[0006] In the existing technology, the upper tower pump in the cooling water circulation system is in full load operation, which consumes a lot of electricity. It is in full load power state 24 hours a day. The so-called full load refers to the maximum power frequency of 50HZ. The full load water pump consumes the most electricity when running. There are three upper tower pumps, two of which are running, and the power reaches 320Kw, that is, two upper tower pumps running per hour consume 320 degrees of electricity. Summary of the invention

[0007] The technical problem to be solved by the present invention is: to overcome the disadvantages of the above-mentioned technology and provide a steelmaking RH vacuum furnace condenser water circulation system which reduces the number of water pumps, implements a cooling water saving mode and optimizes the operating power of the water pumps to achieve the purpose of saving electricity.

[0008] In order to solve the above technical problems, the technical solution proposed in the present invention is: a steelmaking RH vacuum furnace condenser water circulation system, comprising: a condenser, a hot water pool, a filter, a cooling tower and a cold water pool; the condenser is higher than the hot water pool, and the condensed water generated by the condenser flows into the hot water pool by gravity; the filter is arranged between the hot water pool and the cooling tower; the water in the hot water pool is driven by an upper tower pump and passes through the filter before entering the cooling tower; the cooling tower cools the water and then flows into the cold water pool; the water in the cold water pool is driven by a condensation pump and then returns to the condenser.

[0009] A further improvement of the above scheme is that the rotation speed of the condensing pump is divided into four fast and slow gears according to the vacuum degree requirements of the four working modes of the steelmaking RH vacuum furnace. The smaller the vacuum degree requirements of the four working modes of the steelmaking RH vacuum furnace, the slower the corresponding rotation speed of the condensing pump.

[0010] A further improvement of the above scheme is that the operating frequency of the upper tower pump is controlled within a range of 42 to 45 Hz.

[0011] The steelmaking RH vacuum furnace condenser water circulation system provided by the present invention eliminates three lifting pumps, implements cooling water flow in different vacuum furnace working modes, and optimizes the power-saving operation power of the upper tower pump; through actual on-site measurement, about 4 million kWh of electricity is saved each year. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below in conjunction with the accompanying drawings.

[0013] Figure 1 It is a structural schematic diagram of a preferred embodiment of the present invention. Implementation

[0014] Embodiment: A steelmaking RH vacuum furnace condenser water circulation system of this embodiment, such as Figure 1 As shown, it includes: condenser, hot water tank, filter, cooling tower and cold water tank.

[0015] The present embodiment is a transformation of the existing water circulation system. The existing condenser is 37 meters higher than the hot water pool, and a filter is arranged between the two. Although the condenser is 37 meters higher than the hot water pool, considering that the condensed water is not to maintain a water level difference of 37 meters, a lifting pump needs to be set to maintain the pressure of the condensed water passing through the filter. The present embodiment transforms the process steps of the filter into subsequent steps, and the pressure is no longer needed to be maintained at this position. Therefore, the condensed water can be allowed to flow into the hot water pool for collection by gravity. After the hot water pool is collected, it is necessary to use an upper tower pump to send water to the cooling tower. Since the cooling tower in the existing process is higher than the hot water pool, the upper tower pump must be used at this position. The present embodiment uses the pumping pressure of the upper tower pump to arrange the filter, and the filter is arranged between the hot water pool and the upper tower pump. At the same time, the hot water pool also provides a water storage space, which can make the water flow uninterrupted, thereby ensuring that the water flow can maintain pressure through the filter. Then, after the cooling tower is cooled, the water flows into the cold water pool by gravity, and is pumped back to the condenser by the condensation pump to complete the cycle.

[0016] Furthermore: according to the vacuum requirements of the four working modes of the steelmaking RH vacuum furnace, the speed of the condensing pump is divided into four fast and slow gears. The smaller the vacuum requirements of the four working modes of the steelmaking RH vacuum furnace, the slower the corresponding speed of the condensing pump.

[0017] Specifically, in the prior art, the condensate pump always maintains a speed of 2400r / min. In this embodiment, a speed regulator is added to control the speed of the condensate pump. Through on-site implementation, it is finally determined that the vacuum furnace main treatment corresponds to a condensate pump of 2400r / min; the light treatment corresponds to a condensate pump of 1364r / min, the cold steel in the vacuum furnace corresponds to a condensate pump of 620r / min, and the waiting interval corresponds to a condensate pump of 496r / min.

[0018] Furthermore: the original working frequency of the upper tower pump is the industrial frequency of 50Hz, which is determined by the characteristics of the upper tower pump. However, when the upper tower pump works at 50Hz, its efficiency improvement is relatively lower than that of a lower frequency. Through on-site implementation, the inventors found that when the working frequency of the upper tower pump is controlled at 42 to 45Hz, its power consumption and efficiency achieve the optimal balance.

[0019] After on-site implementation of data collection, the following power saving effects were obtained: Improvements Original power consumption (kWh) Current power consumption (kWh) Power saving (kWh) Eliminate three lift pumps 2.2809 million degrees 0 2.2809 million degrees Optimizing cooling water flow in four vacuum furnace operating modes 6.1344 million degrees 4,403,060 degrees 1,731,340 degrees Optimize the power saving operation of the upper tower pump 2,766,480 degrees 2.3348 million degrees 432,000 degrees Total electricity saving per year 11,181,780 degrees 6,737,860 degrees 444.424 million degrees The present invention is not limited to the above embodiments. Any technical solution formed by equivalent replacement falls within the protection scope required by the present invention.

Claims

1. A steelmaking RH vacuum furnace condenser water circulation system, characterized in that: include: A condenser, a hot water pool, a filter, a cooling tower and a cold water pool; the condenser is higher than the hot water pool, and the condensed water produced by the condenser flows into the hot water pool by gravity; The filter is arranged between the hot water pool and the cooling tower; the water in the hot water pool enters the cooling tower after passing through the filter driven by the upper tower pump; the cooling tower cools the water and then flows into the cold water pool; the water in the cold water pool is driven by the condensation pump and returns to the condenser.

2. The steelmaking RH vacuum furnace condenser water circulation system according to claim 1, characterized in that: According to the vacuum requirements of the four working modes of the steelmaking RH vacuum furnace, the rotation speed of the condensing pump is divided into four fast and slow gears. The smaller the vacuum requirements of the four working modes of the steelmaking RH vacuum furnace, the slower the corresponding rotation speed of the condensing pump.

3. The steelmaking RH vacuum furnace condenser water circulation system according to claim 1, characterized in that: The operating frequency of the upper tower pump is controlled at 42 to 45 Hz.

Images