CN202876667U - Device for preparing urea solution by adopting density measurement method - Google Patents
Device for preparing urea solution by adopting density measurement method Download PDFInfo
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- CN202876667U CN202876667U CN201220480298.7U CN201220480298U CN202876667U CN 202876667 U CN202876667 U CN 202876667U CN 201220480298 U CN201220480298 U CN 201220480298U CN 202876667 U CN202876667 U CN 202876667U
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Abstract
The utility model discloses a device for preparing a urea solution by adopting a density measurement method, and relates to preparation of a reducing agent for denitrifying flue gas of a power plant boiler. The device comprises a controller, a urea particle storage bin, a urea dissolution tank, a feeder for conveying urea to the urea dissolution tank from the urea particle storage bin, a water tank connected with the urea dissolution tank via a flow regulating valve, and a urea solution storage tank communicated with the urea dissolution tank via a finished urea solution conveying pipeline which is provided with a pump, wherein the urea dissolution tank is further provided with a urea solution return pipeline in back of the pump; the urea solution return pipeline is connected with the urea dissolution tank in a return manner; a first valve is arranged on the finished urea solution conveying pipeline; a second valve and a densimeter are arranged on the urea solution return pipeline; signals of the feeder, the flow regulating valve, and the densimeter respectively form closed-loop control with the controller; and the controller is used for controlling the starting and the stopping of the feeder and the regulating of the flow regulating valve by virtue of the density signal fed back by the densimeter according to a preset density critical point. The preparation device disclosed by the utility model can be used for automatically preparing the needed urea solution according to the preset density.
Description
Technical field
The utility model relates to a kind of reducing agent urea solution preparing device that the denitrating flue gas such as large-sized station boiler, waste heat boiler are used that is applicable to.
Background technology
Urea is a kind of green fertilizer, can betransported easily, stores and use, and at present, urea is adopted more and more in a large number as power station or industrial burning device denitrating flue gas reducing agent.
Urea is as denitrification reducing agent, need to be prepared into solution and is stored.Present urea usually is prepared to 8-15%Wt. or two kinds of concentration of 50%Wt. store.
The 8-15%Wt. urea liquid, because urea concentration is too low, urea liquid storage volumes and floor space all will increase, and cause cost of investment too high.The urea liquid of 50%Wt., because solution concentration is too high, urea liquid and urea liquid store and all need to pass into steam and prevent urea crystals, separate out to improve the urea liquid temperature, and dissolving and reservoir vessel shell also need insulation, so that investment and operation energy consumption are too high.
The inventor herein studies discovery, prepares by mass percentage the urea liquid of 32.5%Wt., and its crystallization temperature is minimum, reaches-11.5.Under the environment temperature, the urea granules in the solution can crystallization, and can steady in a long-termly store.
The utility model content
The purpose of this utility model is: propose a kind of densitometer method urea solution preparing device, can prepare required urea liquid according to default density to automation.
The purpose of this utility model realizes by following technical proposals:
A kind of densitometer method urea solution preparing device, comprise controller, the urea granules warehouse, the urea dissolving tank, urea is delivered to the batcher of described urea dissolving tank from described urea granules warehouse, the water tank that is communicated with described urea dissolving tank by flow control valve, and the urea liquid storage tank that is communicated with described urea dissolving tank by the finished urea solution conveyor tube line that is provided with pump, described urea dissolving tank also is provided with one road urea liquid return line and returns with self and be communicated with behind described pump, described finished urea solution conveyor tube line is provided with the first valve, described urea liquid return line is provided with second valve and densitometer, described batcher, flow control valve, the densitometer signal forms closed-loop control with described controller respectively, the start and stop of described batcher are controlled in the density critical point that described controller is preset by the density signal basis of densitometer feedback, and the adjusting of described flow control valve.
As optimal way, described density critical point is 1090 ± 2.5%kg/m3.
As optimal way, described controller also is electrically connected with described the first valve, second valve respectively, is controlled the break-make of described the first valve, second valve according to default density critical point by the density signal of densitometer feedback.
As optimal way, described urea granules warehouse is the tapered barrel chamber structure.As optimal way, also comprise the blower fan that fluidization air is blasted taper position, described urea granules warehouse bottom.
As optimal way, described urea dissolving tank also is provided with agitator.
Workflow of the present utility model:
Urea granules carries (or bucket elevator lifting) to the urea granules warehouse by tank car by strength, urea granules warehouse structure is the tapered barrel chamber structure, taper position, bottom blasts fluidization air, prevents the urea granules obstruction blanking of hardening of making moist, and fluidization air is provided by blower fan.
Urea in the urea granules warehouse is delivered in the urea liquid dissolving tank through batcher.Join in the urea dissolving tank from the water in the water tank, the water yield of adding is by the Flow-rate adjustment valve regulation.The urea dissolving tank arranges agitator, accelerates the urea granules dissolving, and urea is configured to urea liquid.
Urea liquid in the urea dissolving tank has two places by the whereabouts of pumping, the urea liquid preparation initial stage, the first valve cuts out, second valve is opened, the urea liquid of this moment turns back in the urea dissolving tank by the urea liquid return line, urea liquid returns density of setting meter on the urea liquid return line of urea dissolving tank, densitometer is used for monitoring urea liquid density, the densitometer signal is delivered to controller, by controller FEEDBACK CONTROL urea granules batcher and Water flow adjusting valve control urea feeding coal and amount of water, coupling by urea granules feed and amount of water, when making urea liquid 31 reach (density such as 32.5 %Wt. is 1090kg/m3), close second valve, open the first valve, urea liquid is switched to finished urea solution conveyor tube line deliver in the urea liquid storage tank and store.
The beneficial effects of the utility model: can prepare required urea liquid according to default density to automation.As dispose 32.5 %Wt., when density was the urea liquid of 1090kg/m3, the urea liquid crystalline temperature was minimum, reached-11.5 ℃, can effectively prevent urea granules crystallization in the urea liquid, separate out; But urea liquid storage tank outdoor arrangement, solution can store steadily in the long term; Urea dissolving and storage need not to arrange heating facility (as passing into Steam Heating) and improve solution temperature, have saved operation energy consumption and running cost; Urea liquid stores and need not to arrange agitator and outer insulation, has saved cost of investment.Be applicable to the reducing agent urea solution preparation that the denitrating flue gas such as large-sized station boiler, waste heat boiler are used, can reach operation energy consumption and the cost of investment purpose of saving the urea dissolving and storing.
Description of drawings
Fig. 1 is the device schematic flow sheet of the utility model embodiment.
The specific embodiment
Below in conjunction with specific embodiments and the drawings the utility model is further described.
As shown in Figure 1, urea granules 11 carries (or bucket elevator lifting) to urea granules warehouse 12 by tank car by strength, urea granules warehouse 12 structures are the tapered barrel chamber structure, taper position, bottom blasts fluidization air 14, prevent the urea granules obstruction blanking of hardening of making moist, fluidization air 14 is provided by blower fan 15.
Urea 11 in the urea granules warehouse 12 is delivered in the urea liquid dissolving tank 32 through batcher 13.Join in the urea dissolving tank 32 from the water in the water tank 23, the water yield of adding is regulated by flow control valve 22.Urea dissolving tank 32 arranges agitator 33, accelerates the urea granules dissolving, and urea is configured to urea liquid 31.
The whereabouts that urea liquid 31 in the urea dissolving tank 32 send by pump 32 has two places, the urea liquid preparation initial stage, the first valve 36 cuts out, second valve 35 is opened, the urea liquid of this moment turns back in the urea dissolving tank 32 by the urea liquid return line, urea liquid returns density of setting meter 37 on the urea liquid return line of urea dissolving tank 32, densitometer 37 is used for monitoring urea liquid 31 density, the densitometer signal is delivered to controller 38, by controller 37 FEEDBACK CONTROL urea granules batchers 13 and Water flow adjusting valve 22 control urea feeding coal and amount of water, coupling by urea granules feed and amount of water, when making urea liquid 31 reach (density of 32.5 %Wt. is 1090kg/m3), close second valve 35, open the first valve 36, urea liquid 31 is switched to finished urea solution conveyor tube line deliver to storage in the urea liquid storage tank 4.Controller 38 can also further be electrically connected with the first valve 36, second valve 35 respectively, controls the break-make of the first valve 36, second valve 35 by the density signal of densitometer 37 feedback according to default density critical point, realizes further automation.
Because the crystallization temperature of the urea liquid of 32.5%Wt. is very low, can reach-11 ℃, consider in the antifreeze situation not needing, the insulation of agitator and heat(ing) coil and the outer insulation of casing can be set in the urea liquid storage tank, but and outdoor arrangement.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (6)
1. densitometer method urea solution preparing device, it is characterized in that: comprise controller, the urea granules warehouse, the urea dissolving tank, urea is delivered to the batcher of described urea dissolving tank from described urea granules warehouse, the water tank that is communicated with described urea dissolving tank by flow control valve, and the urea liquid storage tank that is communicated with described urea dissolving tank by the finished urea solution conveyor tube line that is provided with pump, described urea dissolving tank also is provided with one road urea liquid return line and returns with self and be communicated with behind described pump, described finished urea solution conveyor tube line is provided with the first valve, described urea liquid return line is provided with second valve and densitometer, described batcher, flow control valve, the densitometer signal forms closed-loop control with described controller respectively, the start and stop of described batcher are controlled in the density critical point that described controller is preset by the density signal basis of densitometer feedback, and the adjusting of described flow control valve.
2. densitometer method urea solution preparing device as claimed in claim 1, it is characterized in that: described density critical point is 1090 ± 2.5%kg/m
3
3. densitometer method urea solution preparing device as claimed in claim 1, it is characterized in that: described controller also is electrically connected with described the first valve, second valve respectively, is controlled the break-make of described the first valve, second valve according to default density critical point by the density signal of densitometer feedback.
4. densitometer method urea solution preparing device as claimed in claim 1, it is characterized in that: described urea granules warehouse is the tapered barrel chamber structure.
5. densitometer method urea solution preparing device as claimed in claim 4 is characterized in that: also comprise the blower fan that fluidization air is blasted taper position, described urea granules warehouse bottom.
6. densitometer method urea solution preparing device as claimed in claim 1, it is characterized in that: described urea dissolving tank also is provided with agitator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220480298.7U CN202876667U (en) | 2012-09-20 | 2012-09-20 | Device for preparing urea solution by adopting density measurement method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220480298.7U CN202876667U (en) | 2012-09-20 | 2012-09-20 | Device for preparing urea solution by adopting density measurement method |
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| Publication Number | Publication Date |
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| CN202876667U true CN202876667U (en) | 2013-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201220480298.7U Expired - Lifetime CN202876667U (en) | 2012-09-20 | 2012-09-20 | Device for preparing urea solution by adopting density measurement method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104729169A (en) * | 2015-03-20 | 2015-06-24 | 苏州市泰美达电器有限公司 | Continuous liquid adding device used for diffusion absorption refrigeration system |
| CN105148756A (en) * | 2015-09-30 | 2015-12-16 | 中国船舶重工集团公司第七一一研究所 | Solution preparation device |
| CN106310994A (en) * | 2015-06-30 | 2017-01-11 | 中交疏浚技术装备国家工程研究中心有限公司 | High-concentration bag filling process method and device |
| CN112191149A (en) * | 2020-10-23 | 2021-01-08 | 华能安源发电有限责任公司 | Urea solution preparation facilities of flue gas denitration reductant for thermal power plant |
| CN114733336A (en) * | 2022-04-08 | 2022-07-12 | 华润电力(宁武)有限公司 | System for preventing urea solution conveying pipeline from being blocked |
| CN115090138A (en) * | 2022-06-14 | 2022-09-23 | 苏州西热节能环保技术有限公司 | Efficient urea dissolving device and method |
-
2012
- 2012-09-20 CN CN201220480298.7U patent/CN202876667U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104729169A (en) * | 2015-03-20 | 2015-06-24 | 苏州市泰美达电器有限公司 | Continuous liquid adding device used for diffusion absorption refrigeration system |
| CN106310994A (en) * | 2015-06-30 | 2017-01-11 | 中交疏浚技术装备国家工程研究中心有限公司 | High-concentration bag filling process method and device |
| CN105148756A (en) * | 2015-09-30 | 2015-12-16 | 中国船舶重工集团公司第七一一研究所 | Solution preparation device |
| CN112191149A (en) * | 2020-10-23 | 2021-01-08 | 华能安源发电有限责任公司 | Urea solution preparation facilities of flue gas denitration reductant for thermal power plant |
| CN114733336A (en) * | 2022-04-08 | 2022-07-12 | 华润电力(宁武)有限公司 | System for preventing urea solution conveying pipeline from being blocked |
| CN115090138A (en) * | 2022-06-14 | 2022-09-23 | 苏州西热节能环保技术有限公司 | Efficient urea dissolving device and method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130417 |