CN201195092Y - PH value metering system - Google Patents
PH value metering system Download PDFInfo
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- CN201195092Y CN201195092Y CNU2007203092570U CN200720309257U CN201195092Y CN 201195092 Y CN201195092 Y CN 201195092Y CN U2007203092570 U CNU2007203092570 U CN U2007203092570U CN 200720309257 U CN200720309257 U CN 200720309257U CN 201195092 Y CN201195092 Y CN 201195092Y
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- pipe
- measuring system
- valve
- gypsum
- absorption tower
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Abstract
The utility model provides a pH value measuring system with low energy consumption and low running expense. The pH value measuring system is used for measuring pH value in a desulphurization system which comprises an absorption tower and a gypsum excavating pump. The utility model is characterized in that the PH value measuring system comprises a pipe, a valve and a pH meter, wherein, the pipe is arranged on the side wall of the absorption tower, the valve is arranged on the pipe, the pH is inserted into the pipe so as to perform the measurement for the pH valve, and the pipe is arranged on a position of which the height is basically same with that of the gypsum excavating pump.
Description
Technical field
The utility model relates to the pH value measuring system in a kind of desulfur technology, particularly relates to the pH value measuring system that is applicable in the limestone-gypsum wet desulphurization technology.
Background technology
As the energy, fired coal combustion produces the sulfur-bearing harmful smoke to equipment such as boiler that power plant, steam power plant or other industrial enterprise use or reacting furnace in process of production, mainly is SO with fire coal
2At present, in minimizing atmosphere pollution that China carries out on a large scale, create in the environmental engineering in clear water blue sky many SO
2The discharging rich and influential family implementing the flue gas desulfurization project, especially particularly outstanding with coal fired thermal power plant flue gas desulfurization.No matter be newly-built or the power plant that changes, extends and other coal-fired SO
2Discharging enterprise is in the flue gas desulfurization project of being implemented, to adopt the comparatively general of lime stone-gypsum wet flue gas desulfurizing technology.
In this technology,, in the absorption tower, flue gas is absorbed and oxidation by the circulation of calcium plaster.Promptly by carrying out SO continuously
2To the dissolving of water → utilize oxygen in the exhaust (or be blown in the liquid phase oxygen composition) carry out oxidation → with CaCO
3The neutralize process of (gas phase and liquid phase) absorbs SO
2, in general, gypsum purity is very high in the desulfurated plaster that flue gas desulfurization produces, and the raw material that can be used as cement retarder or other gypsum product uses.Yet free water content is generally in 8～10% these scopes in the desulfurated plaster that contains free water that produces in the flue gas desulfurization technique process, still can't directly use, need to solve the technical problem of dehydration again, make desulfurated plaster be transformed into the product that the free water moisture content is 3-4% at last, can be used as cement retarder like this, perhaps further calcining is removed partly or entirely in conjunction with water, become the semi-hydrated gypsum or the anhydrous gypsum of usefulness such as building, can directly be utilized again, reached the requirement that the byproduct resource of wet desulphurization is utilized again.The factor that influences the gypsum moisture content is more, as grain shape and size, the gypsum dehydration equipment running status of the pH value of the degree of supersaturation of gypsum in slurries, slurries, gypsum crystallization body and to participate in the factors such as the degree of accuracy of instrument of reaction control procedure relevant.In the generative process of gypsum, if process conditions control is bad, tend to generate especially acicular crystal of stratiform, further to sheet, bunch shape or petal development, its viscosity is difficult to dehydration greatly, as CaSO
31/2H
2The O crystal.And desirable gypsum crystal (CaSO
42H
2O) should be short cylinder, bigger than the former particle, be easy to dehydration.(see figure 1).So, control chemical reaction condition in the absorption tower well, the running status of adjusting system equipment is the assurance of gypsum quality.The PH measured value of absorption tower liquid is an important parameter that participates in reaction control, its output valve and some other signal, as the load of boiler, the concentration value of FGD inlet sulfur dioxide and the density of fresh limestone slurries, integrate the flow that is used for determining to be transported to the fresh reactant slurries of fume desulfurating absorption tower.PH value raises, and new reacting slurry supply will reduce.Otherwise pH value reduces, and new reacting slurry supply will increase.If PH meter is inaccurate, not the amount of real needs by the lime stone amount that adds of its control.Excessive lime stone reduces gypsum purity, causes the gypsum dehydration difficulty.Therefore, guarantee normally carrying out of tower internal reaction, it is very important that pH value is measured technology.
PH value measuring technique in the at present domestic limestone-gypsum wet desulphurization technology has following characteristics and problem separately respectively.
1) flue gas desulfurization technique of Japanese weak source company, its PH meter be from directly being inserted into more than the liquid level in the stock tank of absorption tower, the fairly simple convenience of this method, but the position is higher, need add platform in addition.
2) flue gas desulfurization technique of Kawasaki, Japan heavy industry, the spray column PH meter systems measuring method of Kawasaki then adopt from excavationg pump outlet return duct and get a branch, with 8m per hour
3The flow velocity of/h enters PH and measures case, the PH meter is inserted measure in the case then, and same Kawasaki also is to adopt two to get one metering system.This measuring method is more loaded down with trivial details, and the flow process more complicated because position is higher, need add platform simultaneously equally in addition.Like this except the cost of PH meter own, expense is also corresponding increases considerably for other pipeline valve and platform etc.
3) Germany is than the flue gas desulfurization technique of Xiao Fu company, the design of its PH meter returns in the absorption tower pulse suspension system that (towards suspension system is the special technology of Germany than Xiao Fu company on the pipeline of absorption tower, realize the self-loopa of slurries in the tower by the pulse suspension pump, replace other family's absorption tower agitator, reach evenly mixed, stock tank bottom slurries do not precipitate, and realize the abundant oxidation purpose of calcium sulfite), the fairly simple practicality of this mentality of designing.
4) flue gas desulfurization technique of this smooth Miller company of Germany, scheme (one) extracts branched pipe and adds two restriction orifices from gypsum excavationg pump outlet line, reduce its pressure, reduce serous granule to the abrasion of PH probe, PH is inserted in the vertical pipe of take-off line, and add the flushing water system, so that regularly the PH meter is washed.Take-off line turns back in the absorption tower at last.Scheme (two) adds a restriction orifice from gypsum excavationg pump outlet line, reducing its main pipe pressure is convenient to take-off line and returns person in charge's (is 0.02MPa such as setting the restriction orifice pressure drop), before restriction orifice, extract branched pipe then and add two butterfly valves, the PH meter is inserted in the vertical pipe of take-off line between two butterfly valves, and add the flushing water system, so that regularly the PH meter is washed.Take-off line turns back in the person in charge behind the restriction orifice at last.This scheme is simple, but flow velocity is higher, and is more serious to the probe abrasion.
5) flue gas desulfurization technique of U.S. Marsulex Environmental Technology AS, the design of the PH of U.S. Marsulex company meter is very simple, directly be connected on the outlet line of plaster slurry pump, in order to prevent directly washing away of slurries, PH interface pipeline in fluid in the same way, so promptly can reduce of the abrasion of gypsum slurries particle, can not form non-current slurries in can avoiding again taking over PH meter probe; Reached the purpose of real-time monitoring pH value.
6) U.S. Ba Wei (B﹠amp; W) flue gas desulfurization technique of company, U.S. Ba Wei company and MarsulexPH meter design concept are closely similar, also are directly to be connected on the outlet line of plaster slurry pump, have just increased the online flushing of fresh water (FW), and have cancelled ball valve.There is practical application in the Xuzhou prosperous power plant of China; 7) flue gas desulfurization technique of Austria Energy and Environment joint-stock company (AEE), the flue gas desulfurization technique PH meter design concept of Austrian AEE is to extract a branched pipe from the plaster slurry pump outlet line, connects two-way PH meter then, turns back to the absorption tower after the merging; And PH meter added clean-up line.
8) flue gas desulfurization technique of French Alstom (ALSTON) company, the France ALSTON flue gas desulfurization technique PH of company meter design of measuring system is on the sidewall of absorption tower, this method of testing is simple and practical, but may PH meter need periodic inspection to safeguard or occur slurries water clock situation during flushing easily.
In sum, each tame pH value measuring system respectively has characteristics, but it is more loaded down with trivial details to exist method, flow process more complicated, cost height, problems such as serious wear.
The utility model content
The utility model is based on the problems referred to above and proposes, and purpose is to provide a kind of pH value measuring system, and it is suitable for the desulfur technology of wet type limestone-gypsum, and energy consumption is low, equipment investment and operating cost are low.
PH value measuring system of the present utility model is used for measuring pH value in desulphurization system, and this desulphurization system comprises: absorption tower, the gypsum excavationg pump that links to each other with the absorption tower is characterized in that this pH value measuring system comprises: pipe is arranged at the absorption tower sidewall; Valve is installed on the aforementioned tube; PH meter is inserted in the pipe to carry out the measurement of pH value, and described pipe is arranged on the position identical with gypsum excavationg pump inlet tube height with the position of sidewall connection, absorption tower.
According to the utility model, the PH meter is arranged in low level, and absolute altitude is below 1.2 meters, not only is convenient to flushing but also is convenient to operation maintenance; The rate of flow of fluid of PH instrumentation amount slurries is slower, and the flow velocity of absorption tower overflow pipe is generally less than 1m/s, and is less to washing away of PH probe like this.This scheme pipeline designs is quite simple, only needs a small amount of valve and pipeline.This scheme is not because the low level layout needs to be provided with inspection platform.
Description of drawings
Fig. 1 is the schematic diagram that the limestone-gypsum wet desulphurization technology of pH value measuring system of the present utility model is used in expression.
Fig. 2 is the schematic diagram of the direct angle-inserting type pH value of the tower wall measuring system of an expression embodiment of the present utility model.
Fig. 3 is the schematic diagram of the tower wall oblique cutting overflow-type pH value measuring system of an expression embodiment of the present utility model.
Fig. 4 is the schematic diagram of the excavationg pump inlet epigyny pH value measuring system of an expression embodiment of the present utility model.
Description of reference numerals:
Slurries pond, 1 absorption tower
2 PH meter,
3 diaphragm valves,
4 absorption tower sidewall inclined tubes,
5 branched pipe butterfly valves,
6 branched pipes,
7 trenches,
8 gypsum excavationg pumps inlet butterfly valve,
9 gypsum excavationg pump inlet tubes,
10 gypsum excavationg pumps
The specific embodiment
Below in conjunction with the drawings and specific embodiments lime stone of the present invention-gypsum wet sulfur removal technology and pH value measuring system are further specified, to help understanding content of the present invention.Should be understood that, the invention is not restricted to following embodiment, can carry out numerous variations within the scope of the claims.
Lime stone-gypsum wet flue gas desulfurizing technology, its whole process of production as shown in Figure 1, the flue gas that boiler or other coal combustion equipment 11 produces after flue by-pass damper door is closed, enters wet method fume desulfurizing system.In wet method fume desulfurizing system, after flue gas process desulfurization booster fan 12 and 13 coolings of flue gas heat exchange device, enter absorption tower 15, flue gas contacts mixing with the limestone/lime slurries, the SO in the flue gas
2Carry out chemical reaction with the calcium carbonate in the slurries and the air that carries out forced oxidation of adding, generate calcium sulphate dihydrate (CaSO at last
42H
2O) be gypsum slurries.Clean flue gas after the desulfurization is removed water droplet through demister successively, pass through flue gas heat exchange device 13 heat temperature raisings again after, enter atmosphere by chimney 14.The gypsum slurries that produces in absorption tower 15 in the sweetening process becomes the desulfurated plaster slurries that contain free water about 50% after by waterpower gypsum cyclone 16 concentration, be pumped to vacuum belt dewaterer 17 through gypsum slurries again and be dehydrated into the desulfurated plaster (dihydrate gypsum) of moisture content (free water) below 10%, enter the desulfurated plaster bank then.When flue gas desulphurization system was stopped transport, the by-pass damper door was opened, and flue gas directly enters atmosphere from the bypass flue by chimney 14.
In the pH value measuring system of the present utility model, comprise absorption tower sidewall pipe (being preferably inclined tube) 4, valve 3 (being preferably diaphragm valve) and PH meter 2 etc., described pipe is arranged at the absorption tower sidewall; Described valve is installed on the aforementioned tube, described pipe is arranged on the position identical with gypsum excavationg pump inlet tube height with the position of sidewall connection, absorption tower, and the position of described pipe and sidewall connection, absorption tower is the installation site of vial when being installed on the sidewall of absorption tower.The PH meter can use the industrial online PH meter of selling on the market.PH meter 2 directly is inserted in the absorption tower sidewall inclined tube 4, and feed slurries pond, absorption tower 1, in case of necessity with 1 extraction of PH meter, to its periodic flushing from slurries pond, absorption tower, what is called is highly identical, certainly also comprise highly approaching and not identical situation, like this, the position of PH meter is lower, do not need to be provided with in addition platform, saved recondition expense, and its pipeline designs is quite simple, has saved a large amount of operating costs.
In above-mentioned pH value measuring system, when to flushing of PH meter or maintenance, the PH meter is extracted out simultaneously, quick closedown diaphragm valve 3, but always a small amount of ororrhea occurring flows to ground.Therefore, preferably, the pH value measuring system also comprises branch's pipe valve (being preferably butterfly valve) 5 and the branched pipe 6 that links to each other with described inclined tube, PH meter 2 is inserted in the absorption tower sidewall inclined tube 4 with the substantially the same position of gypsum excavationg pump height, utilize absorption tower stock tank liquid level pressure differential simultaneously, can guarantee to have slurries to flow into trench 7 always from branched pipe 6.The time close diaphragm valve 3 when maintenance, so both avoided flushing or overhauled the overflowing on the ground of PH timing gypsum slurries, can guarantee that again measured gypsum slurries monitors in real time.So both be convenient to PH meter maintenance, and can not allowed ororrhea flow to ground again during maintenance, the rate of flow of fluid of PH instrumentation amount slurries is slower, and the flow velocity of absorption tower overflow pipe is generally less than 1m/s, and is less to washing away of PH probe like this.
But, according to above-mentioned preferred pH value measuring system, may have a small amount of gypsum slurries and overflow to the absorption tower melt pit, when returning the absorption tower with sump pump again, will have certain energy consumption.Therefore, more preferably, the pH value measuring system also comprises gypsum excavationg pump inlet valve (being preferably butterfly valve) 8 and the gypsum excavationg pump inlet tube 9 that links to each other with branched pipe, PH counts 2 oblique cuttings in high (upper mouthful) the absorption tower sidewall inclined tube 4 of gypsum excavationg pump inlet top 0.3-0.5 rice, connect a branched pipe 6 then and enter gypsum excavationg pump inlet tube 9, when 10 operations of gypsum excavationg pump, slurries can not stop to enter the pump housing; When maintenance, close diaphragm valve 3 and branched pipe butterfly valve 5.So both guaranteed that measured gypsum slurries monitored in real time, be convenient to the maintenance of PH meter again, and can not allow ororrhea flow to ground again during maintenance, also do not had extra energy consumption consumption simultaneously.
PH value measuring system of the present utility model is applicable to that lime stone-gypsum wet sulfur removal technology and other need measure in the chemical technology of pH value.
Claims (8)
1. a pH value measuring system is used for measuring pH value in desulphurization system, and this desulphurization system comprises: absorption tower, the gypsum excavationg pump that links to each other with the absorption tower is characterized in that this pH value measuring system comprises: pipe is arranged at the absorption tower sidewall; Valve is installed on the aforementioned tube; PH meter is inserted in the pipe to carry out the measurement of pH value, and described pipe is arranged on the position identical with gypsum excavationg pump inlet tube height with the position of sidewall connection, absorption tower.
2. pH value measuring system as claimed in claim 1 is characterized in that, being provided with of described pipe highly is below 1.2 meters.
3. pH value measuring system as claimed in claim 1 is characterized in that, described pipe is the inclined tube that is obliquely installed, and described valve is a diaphragm valve.
4. as each described pH value measuring system in the claim 1～3, it is characterized in that, also comprise branched pipe that links to each other with described pipe and the branch's pipe valve that is installed on this branched pipe.
5. pH value measuring system as claimed in claim 4 is characterized in that, described branch pipe valve is a butterfly valve.
6. pH value measuring system as claimed in claim 4 is characterized in that, also comprises gypsum excavationg pump inlet tube that links to each other with described branched pipe and the inlet valve that is installed on this gypsum excavationg pump inlet tube.
7. pH value measuring system as claimed in claim 6 is characterized in that, described inlet valve is a butterfly valve.
8. a desulphurization system comprises as each described pH value measuring system in the claim 1～7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007203092570U CN201195092Y (en) | 2007-12-29 | 2007-12-29 | PH value metering system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007203092570U CN201195092Y (en) | 2007-12-29 | 2007-12-29 | PH value metering system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201195092Y true CN201195092Y (en) | 2009-02-18 |
Family
ID=40414732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007203092570U Expired - Lifetime CN201195092Y (en) | 2007-12-29 | 2007-12-29 | PH value metering system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201195092Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104759245A (en) * | 2015-03-17 | 2015-07-08 | 浙江中山化工集团股份有限公司 | Chemical reaction kettle external-circulating-type digital-display remote-transmission pH meter device |
| CN109406578A (en) * | 2018-10-16 | 2019-03-01 | 华电电力科学研究院有限公司 | A kind of desulfurized gypsum slurry pH value on-line measurement device and its working method |
-
2007
- 2007-12-29 CN CNU2007203092570U patent/CN201195092Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104759245A (en) * | 2015-03-17 | 2015-07-08 | 浙江中山化工集团股份有限公司 | Chemical reaction kettle external-circulating-type digital-display remote-transmission pH meter device |
| CN109406578A (en) * | 2018-10-16 | 2019-03-01 | 华电电力科学研究院有限公司 | A kind of desulfurized gypsum slurry pH value on-line measurement device and its working method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090218 |
|
| CX01 | Expiry of patent term |