CN1083211A - Closed soft water cooling loop of blast furnace leak detection system and method - Google Patents
Closed soft water cooling loop of blast furnace leak detection system and method Download PDFInfo
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Abstract
Analyzing on the in-problem basis of existing several closed soft water cooling loop of blast furnace leak hunting technologies, the present invention adopts unlimited soft water leak detection loop, use leak detection dedicated cooling system and the small-sized coal gas drip catcher on the refrigeratory connecting pipe and the high sensitivity CO test paper of furnace shell outside, the position height at refrigeratory breakage place is leaked and found out to the opening that can judge each refrigeratory branch on the closed soft water cooling loop of blast furnace more convenient and intuitively.The leakage that has microcrack with high pressure and no potential head leak detection loop detection.The online leak detection of the present invention, do not cut off the water, do not influence ordinary production, simple in structure, small investment, flexible operation, leak detection is sensitive, and the leak detection dedicated cooling system also can be made vehicular.
Description
The present invention is the detection that blast furnace water-cooling furnace wall employing closed soft water cooling loop leaks, and belongs to the technical field of smelting of iron and steel.
Since the seventies, the blast furnace water-cooling refrigeratory adopts closed soft water or pure water cooling loop more prevalently both at home and abroad.China has adopted the large and medium-sized blast furnace (350～3200M that goes into operation or be about to go into operation of closed soft water cooling loop since national big-and-middle-sized blast-furnace shaft life-span discussion in 1984
3) above 10, blast furnace adopts the necessity of closed soft water cooling loop to become the common recognition of domestic ironmaking circle, compare with the service water cooling loop that we opens, the cooling of closed soft water cooling loop is fully reliable, the running energy consumption is hanged down and water resource is lost advantages such as minimizing significantly, remains in certain difficulty and inconvenience but leak in the refrigeratory breakage that detects this loop at present.
The existing detection method that detects the closed soft water cooling loop of blast furnace leakage is:
1. the Leak Detection of whole loop:
Closed soft water cooling loop of blast furnace and atmospheric isolation, so no vaporization loss, under the tight situation of pipe joint and valve seal, unique normal leakage of whole loop only is sealing place of water circulating pump, under certain hydraulic pressure, it is constant that its leakage rate keeps over a period to come basically.The underheat degree of volumetric expansion when raising for soft water temperature in the compensation loop and raising soft water seals the expansion drum that is typically provided with filling certain pressure nitrogen in the soft water cooling loop.Be located at water level gauge on the expansion drum and both can be used for controlling the keying of supply soft water valve, can monitor the leakage situation of whole loop again according to the variation process of water level, the interior water level of normal condition expansion drum reduces over time, and rule is more stable, occur new leakage in the loop, SEA LEVEL VARIATION is obviously accelerated.This method can only determine that big damaged the leakage appearred in the stove intercooler, damages but can't predict that refrigeratory.
2. refrigeratory branch Leak Detection:
Determine the position of damaged refrigeratory, at first will find out that branch and have leakage, existing following several method:
1. install high precision flow (as electromagnetic flowmeter) on the water supply of each branch and return pipe, can monitor according to the difference in flow that supplies water with backwater whether each branch occurs leaking at any time, but the branches of full stove is numerous, construction investment and maintenance cost are huge.
2. turn-off the water supply and the backwater valve of suspicious branch front and back, this branch and whole loop are cut off, if the refrigeratory that this branch connected has leakage, because gas pressure is higher than the hydraulic pressure in this branch behind the partition in the stove, coal gas will enter in the branch by breakage, water in the branch also will enter in the stove simultaneously, and such air inlet result of leaking can make pressure in the branch present to a certain degree rising.Therefore,, actual be difficult to judge that cutting off back branch internal pressure raises, and show and have or not leakage as no rich experience.
3. adopt coal gas detector or electricity to lead leak detector and survey leakage.This type of detector is normally placed on the coal gas drip catcher of top return pipe, only is used for the Leak Detection of blast furnace periphery Shang Ge district refrigeratory usually, if be used to detect then One's name is legion of each branch, and investment and maintenance cost is increased severely.The pipeline that this method detected still is communicated with whole loop, therefore, if comprise that the hydraulic pressure of the breakage that fills nitrogen pressure in the expansion drum is higher than gas pressure in the stove, just can only leak in stove by breakage, and coal gas can not enter in the refrigeratory in the stove.Even hydraulic pressure is lower than gas pressure in the stove in addition, catch that productive set also needs the time of growing to certain coal gas amount of instrument sensitivity in the gas device on the return pipe but will make.
4. connect the two ends of suspicious branch with transparent tube, and this branch and whole loop are cut off, when coal gas entered in the branch by breakage, the water branch in also bled in the stove, and the decline of water table that transparent tube is interior is until the surface level place that is stabilized in the refrigeratory breakage.Though the comparison of this kind method is directly perceived accurately, branch's time of cutting off the water supply is longer, might enlarge existing breakage or cause new damage.
3. the detection of damaged refrigeratory position in the branch:
The method of damaged refrigeratory position is with small-sized coal gas drip catcher in the detection branches more commonly used and easy both at home and abroad at present, and whether the gas that the discharging of gas device is caught in igniting examination combustion has detonation sound, and detecting refrigeratory has not damaged.But this method is in when igniting during by damaged refrigeratory discharging coal gas and steam is often arranged, so ignition difficulties.In addition when hydraulic pressure branch in was higher than in the stove gas pressure, coal gas just can not enter and catch in the gas device, and having only could be with catching the detection of gas device when branch and whole loop partition.
The object of the invention is to leak at existing closed soft water cooling loop of blast furnace the detection method of branch, exists and can not onlinely detect, and it is more to be equipped with instrument system, and detection time is long, and sensitivity is not high, shortcomings such as poor reliability.The present invention adopts the leak detection loop and the airtight no potential head soft water leak detection loop of closed soft water cooling loop.Closed soft water cooling loop of blast furnace is carried out online leak detection, and its leak detection speed is fast, highly sensitive.
Content of the present invention is the leak detection loop and the airtight no potential head soft water leak detection loop of closed soft water cooling loop of blast furnace, comprise soft water leak detection loop and high pressure leak detection loop that we opens, can detect the open damaged leakage branch of blast furnace water-cooling loop respectively and detect the leakage branch that microcrack is only arranged.Utilize water level gauge, high sensitivity flowmeter and high sensitivity CO detection paper are determined the open branch of leaking, and microcrack leaks branch, and can detect the cracking position.Can to be single leak detection loop hunt leak also available fixed or portable touring leak detection system to a plurality of cooling loop branch to this leak detection loop.
The thick black line of Fig. 1 is partly represented the leak detection loop of closed soft water cooling loop of blast furnace, and the thick black line of Fig. 2, Fig. 3 is partly represented airtight no potential head soft water leak detection loop.The thin thread part of Fig. 1, Fig. 2, Fig. 3 divides the expression closed soft water cooling loop of blast furnace loop of promptly working.Leak detection loop and airtight no potential head soft water leak detection loop mainly comprise: leak detection looped cycle water pump (14), reverse checkvalve (15), the high precision flow (16) of leak detection comprises that electromagnetic flowmeter or vortex shedding flow meter place the pipe system of water supply and backwater respectively, leak detection water supply collector (17) and backwater collector (20), the demineralized water tank (13) that opens wide, supply soft water pipeline (12) from the blast furnace cooling loop, the leak detection backwater refrigeratory of blast furnace cooling loop secondary cooling water pipeline (22), the small-sized refrigeratory of leak detection system (21), leak detection water pipe and valve (23) from the blast furnace cooling loop, return the leak detection water pipe and the valve (24) of blast furnace cooling loop, the flexible pipe and the joint (18) that connect blast furnace cooling loop branch, small-sized coal gas drip catcher (19), open wide the backwater valve (25) of soft water leak detection loop, vent valve (26).
Closed soft water cooling loop of blast furnace sees that Fig. 1, Fig. 2, Fig. 3 thin thread part branch comprise: the threeway (9) of soft water station supply channel (7), demineralized water tank (6), additional soft wa ter pump (5), water circulating pump (4), expansion drum (3), the cooling arm (10) that replenishes nitrogen inlet (2), air primary cooler (1), supply channel (8), water return pipeline (11), refrigeratory, connection blast furnace cooling circuit and leakage detecting circuit.
The present invention leak detection is three grades of leak detection systems, and first order leak detection is provided with pressurising nitrogen expansion jar and water level gauge for closed soft water cooling loop of blast furnace, and record decline of water table speed when this fall off rate has when increasing significantly, illustrates that there is bigger leakage in this system.Second level leak detection is the leak detection loop of closed soft water cooling loop of blast furnace, utilizes two high precision flows of supply channel and water return pipeline; Electromagnetic flowmeter or vortex shedding flow meter, the discharge of turnover pipeline that detects a refrigeratory or one cooling arm is poor, and its sensitivity determination is equivalent to water cooler and the leakage rate that φ 1～2mm boring causes occurs, and adopts the loop detection of hunting leak in Fig. 1～3.When third level leak detection determines that for leak detection hydrocooler and water-cooled branch leak, for further determining the leak position.Utilize the refrigeratory breakage to cause the interior gas leak of stove to collect, and utilize highly sensitive CO detection paper, can determine the leak position by a survey for gas collector.Utilize CO test paper replaced C O methods of printing, solved the problem that is difficult for lighting because of coal gas band water, thereby improved leak detection efficient.
The method of the present invention's leak detection
1. the open type soft water leak detection loop detection refrigeratory branch method of leaking.
1. at the branch two ends of intending detecting, use flexible pipe to be connected T-valve (9) and leak detection water supply collector (17) and leak detection water return pipeline (20) with joint (18) respectively, permanent leak detection all is set with under the situation of connecting tube in each branch, then can omits the work of mounting or dismounting flexible pipe.If adopt the then available PLC of the T-valve system control of straighforward operation at the two ends of each branch, reach and regularly detect each branch successively or selectively automatically.
2. under the situation that valve (23), (24) shutoff and valve (25) are opened, the T-valve of intending the detection branches two ends is transformed into and opens wide the position that the leak detection loop is connected.At this moment because water circulating pump (14) exit of leak detection loop is provided with reverse checkvalve (15), the unlikely emptying of the water in this branch.
3. the ebullator (14) that starts the leak detection loop supplies water to this branch, and whether water supply and the circling water flow rate of observing this branch with high precision flow (16) have difference, if difference in flow is arranged, show promptly that this branch has to sew, otherwise nothing is not sewed.
4. when judging that with the leak detection loop there is leakage in this branch, just have and do not accumulate coal gas, detect the damaged particular location that leaks refrigeratory by high sensitivity CO test paper with coal gas drip catcher (19) inspection.Should be noted that hydraulic pressure should be lower than gas pressure in the branch.Can suitably turn down water supply collector (17) and go up the valve that supplies water to this branch, to reduce hydraulic pressure in the branch.
5. if that branch that judgement is crossed with the leak detection loop detection does not have is sewed, just with two other flexible pipe another branch that intends detecting is connected with the leak detection loop, the water circulating pump of the loop of hunting leak just supplies water to two branches simultaneously.Subsequently the preceding T-valve that has detected those branch two ends that finish is transformed into the position that is connected with the airtight cooling loop of blast furnace.So just begun the detection of second branch.
2. the high pressure loop detection of leaking hunting has the leakage branching method of microcrack:
1. valve-off (25), Open valve (23), (24), high pressure soft water from the airtight cooling loop of blast furnace just enters leak detection water supply collector pipe (17) by the flowmeter (16) of below, after flowing through the refrigeratory branch that intends detecting, enter leak detection backwater collector (20) and turn back to the backwater cooling system by the flowmeter (16) of top again, also be according to the difference in flow that supplies water with backwater, judge whether this branch has to sew.
2. judge a certain branch exist leak after, connect the two ends of this branch with transparent tube, and this branch and blast furnace cooling loop partition.
3. keep opening for the microcrack that makes damaged refrigeratory, need in this branch, to add again the portable small-sized nitrogen cascade (not marking among Fig. 1) that fills of a special use, with the hydraulic pressure in this branch after improve cutting off (gas pressure in the only suitable a little higher than stove of hydraulic pressure branch in is in order to avoid the water interior even emptying of stove of bleeding in a large number in expanded crack and the branch).
4. judge damaged position by the stationary value of water level reduction in the transparent tube.
3. the leak hunting method of airtight no potential head soft water leak detection loop:
For potential head and the resistance to flow that overcomes in the cooling water pipe changes the demineralized water tank (13) that opens wide into be full of soft water or little air is only arranged on the groove top closed demineralized water tank such as Fig. 2 on the basis of Fig. 1, pressure in the cooling water pipe of somewhere on the blast furnace height like this, only overcome remaining static pressure after the resistance to flow that arrives this place for water circulating pump (14), pressure in the cooling water pipe is easier to be lower than gas pressure in the stove, enters cooling water pipe thereby be convenient to the interior coal gas of stove.On the device structure except that demineralized water tank (13) is made into the closed, establish a vent valve (26) at this groove top.Sequence of operation when detecting need make the following changes:
1. under the situation that vent valve (26) is opened, behind the startup water circulating pump (14), to demineralized water tank (13) moisturizing, discharge by vent valve by the air on groove top by (12) for the blast furnace cooling loop.
When treating that 2. water that vent valve (26) is discharged is not with bubble, turn-off the valve of supply hose (12) earlier, close vent valve (26) again, this moment, the Leak Detection loop just was in airtight no potential head running status.
If intend taking demineralized water tank (13) top to remain the method for operation of part air, then airtight demineralized water tank (13) is arranged on the highest point of Leak Detection loop, as shown in Figure 3.
The present invention is provided with special-purpose leak detection cyclic system, comprises leak detection looped cycle water pump, reverse checkvalve, high precision flow, be arranged on the water supply and the water return pipeline of leak detection loop, leak detection water supply collector and backwater collector open wide or airtight demineralized water tank and vent valve, from blast furnace loop supply soft water pipeline.Connect blast furnace cooling loop leak detection water supply and return water lines, blast furnace cooling loop branch and leak detection loop connecting line cool off branch with the leak detection of high sensitivity CO test paper and leak.The soft water leak detection loop leak hunting method that opens wide, valve-off (23), (24) start valve (25), start leak detection looped cycle water pump (14) again, utilize high sensitivity CO test paper to detect at coal gas collector place.
High pressure of the present invention leak detection loop leak hunting method, valve-off (25), Open valve (23), (24) are introduced leak detection loop traffic meter (16) from the soft water of the airtight cooling loop of blast furnace and are measured and supply water and return the water route difference in flow and hunt leak.
The airtight no potential head soft water leak detection loop of the present invention changes the demineralized water tank that opens wide into closed demineralized water tank (13), the top of groove is provided with vent valve (26), open vent valve during leak detection, start leak detection looped cycle water pump (14), by pipeline (12) to the demineralized water tank moisturizing, treat that water is full of demineralized water tank and closes vent valve again, make leakage detecting circuit be in airtight no potential head soft water leak detection loop running status.Its leak hunting method is identical with the method for open type demineralized water tank leak detection loop.
Technical characterstic of the present invention: the auxiliary coolant system of providing low pressure weep amount for oneself constitutes the leak detection loop, at leak detection cooling arm or refrigeratory, the refrigeratory of being hunted leak is not cut off the water supply, and belongs to the cyclic system of online leak detection, does not influence the life-span and the ordinary production of the water-cooling wall of blast furnace.And when guaranteeing to occur refrigeratory damaged, CO coal gas is easy to discharge from leak, is convenient to determine the leak position with the leak detection of CO test paper.The present invention uses the CO test paper highly sensitive, and has chromogenic reaction to be easy to leak detection.The breakage of φ 2mm appears in water cooler, CO+H in the gas leakage
2Content surpasses 20%, and about 30-40 will develop the color second.The present invention only needs a small amount of high-precision flow to take into account a water circulating pump and pipeline and valve, and is simple in structure, small investment, and flexible operation, leak detection is sensitive.
Leak detection system that this is complete and method have comprised three grades of leak detections promptly:
1. with the water level gauge on the cooling loop decline of water table speed is shown, judges whether total system has leakage;
2. judge with arm high precision flow up and down whether a certain arm has leakage;
3. capture coal gas and judge have CO to leak outside with the coal gas drip catcher on the arm, thereby judge the leakage of some refrigeratorys from refrigeratory with high sensitivity CO test paper.
The present invention can be fixed leak detection loop and patrolling leak detection loop (vehicular), and therefore, the instrumentation environment is good, is easy to safeguard long service life.
Claims (2)
1, closed soft water cooling loop of blast furnace leak detection system and method, whole water-cooled loop is provided with pressurising nitrogen expansion jar and water level gauge, refrigeratory branch loop is provided with high precision flow, the coal gas drip catcher, it is characterized in that being provided with special-purpose leak detection cyclic system, comprise leak detection looped cycle water pump, reverse checkvalve, high precision flow is arranged on the water supply and the water return pipeline of leak detection loop, leak detection water supply collector and backwater collector, open wide or airtight demineralized water tank, vent valve, from blast furnace loop supply soft water pipeline, connect blast furnace cooling loop leak detection water supply and return water lines, blast furnace cooling loop branch and leak detection loop connecting line, branch leaks with high sensitivity CO test paper leak detection cooling.The soft water leak detection loop leak hunting method that opens wide, valve-off (23), (24) start valve (25), start leak detection ring water pump (14) again, utilize high precision flow (16) observation flow difference to hunt leak and cool off branch, utilize high sensitivity CO test paper to detect at the gas collector place.The leak hunting method of high pressure leak detection loop, leak detection loop traffic meter (16) is introduced from the soft water of the airtight cooling loop of blast furnace in valve-off (25), Open valve (23), (24), and mensuration supplies water and returns the water route difference in flow and hunt leak.
2, according to claim 1 closed soft water cooling loop of blast furnace leak detection loop and method, it is characterized in that being provided with the closed demineralized water tank, the top of groove is provided with vent valve (26), open vent valve during leak detection, start leak detection looped cycle water pump (14), to the demineralized water tank moisturizing, treat that water is full of demineralized water tank by pipeline (12), close vent valve again, be in airtight no potential head soft water leak detection loop running status.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92109780A CN1052539C (en) | 1992-08-28 | 1992-08-28 | Leakage testing system and method for closed soft water cooling loop of blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92109780A CN1052539C (en) | 1992-08-28 | 1992-08-28 | Leakage testing system and method for closed soft water cooling loop of blast furnace |
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| Publication Number | Publication Date |
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| CN1083211A true CN1083211A (en) | 1994-03-02 |
| CN1052539C CN1052539C (en) | 2000-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN92109780A Expired - Fee Related CN1052539C (en) | 1992-08-28 | 1992-08-28 | Leakage testing system and method for closed soft water cooling loop of blast furnace |
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| CN2067813U (en) * | 1990-03-26 | 1990-12-19 | 唐智雄 | Soft water heating duster of u-tube box-coupling type |
| JP2500488B2 (en) * | 1991-02-08 | 1996-05-29 | ヤマハ株式会社 | Leak test method and leak test device |
| CN2146707Y (en) * | 1992-09-08 | 1993-11-17 | 华东冶金学院 | Leak detector for use in soft water cooling system of blast furnace |
| CN1084220A (en) * | 1992-09-08 | 1994-03-23 | 华东冶金学院 | Method for detecting leakage of blast furnace soft water sealed circulation cooling system |
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- 1992-08-28 CN CN92109780A patent/CN1052539C/en not_active Expired - Fee Related
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