CN217312820U - Urea solution preparation system of urea ammonia production device - Google Patents
Urea solution preparation system of urea ammonia production device Download PDFInfo
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- CN217312820U CN217312820U CN202220459156.6U CN202220459156U CN217312820U CN 217312820 U CN217312820 U CN 217312820U CN 202220459156 U CN202220459156 U CN 202220459156U CN 217312820 U CN217312820 U CN 217312820U
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Abstract
The utility model discloses a urea solution preparation system of urea ammonia plant belongs to urea field of hydrolysising, including the drain tank, the urea feed bin, urea dissolving tank and urea solution holding vessel, the bottom of drain tank is connected to the urea dissolving tank through hydrophobic outlet pipe, install the hydrophobic pump on the hydrophobic outlet pipe in proper order, electronic feed valve, electronic water supply governing valve and jet pump, urea feed pipe connection to urea dissolving tank is passed through to the bottom of urea feed bin, compressed air pipe divides two the tunnel to link to each other with urea feed pipe and hydrophobic outlet pipe respectively, urea dissolving tank's bottom is passed through the upper portion of urea solution duct connections to urea solution holding vessel, urea dissolving tank's mid-mounting has dissolving tank level gauge, urea dissolving tank's upper portion is connected with the urea solution circulating pipe, urea solution circulating pipe is connected to the urea solution conveyer pipe. The utility model relates to a rationally reliably, the urea solution system of preparing moves stably, and the pipeline does not have the jam, but the automatic operation has reduced manual operation.
Description
Technical Field
The utility model relates to a system especially relates to a urea solution preparation system of urea ammonia plant, belongs to the urea field of hydrolysising.
Background
The Selective Catalytic Reduction (SCR) denitration technology is a main technical means for controlling the standard emission of NOx in flue gas of a thermal power plant, and mainly utilizes NH 3 As a reducing agent, reacts with NOx in the flue gas to produce harmless nitrogen and water. However, in the actual production of power plants, liquid ammonia is always used for preparing NH 3 Means of gas. However, liquid ammonia has many disadvantages such as easy volatilization, strong corrosivity, easy environmental pollution after leakage, etc. And the liquid ammonia storage tank of part of thermal power plants has large storage capacity which is far beyond the supercritical capacity, and is listed as a major hazard source, thus seriously threatening the safety production of the power plants.
In recent years, a urea ammonia production system is developed rapidly and maturely, and the system is widely applied due to the advantages of safety, stability, low energy consumption, high utilization rate and the like. The system is used for preparing urea solution with the concentration of 50 percent, carrying out hydrolysis reaction under certain pressure and temperature, separating and outputting finished ammonia gas to replace ammonia gas generated by liquid ammonia and enter an SCR (selective catalytic reduction) zone.
The project of urea ammonia production mainly comprises several important components of urea solution preparation and storage, steam temperature and pressure reduction, urea solution delivery, hydrolysis reaction, finished product delivery and the like. In a urea ammonia preparation system, particularly in a urea solution preparation link, urea particle dissolution needs manual feeding and preparation, and stable and automatic system operation is difficult to realize due to incomplete urea particle dissolution, uncontrollable urea solution preparation amount and unstable urea dissolution tank liquid level; meanwhile, the concentration of the urea solution is often unqualified, and the output of the qualified urea solution is difficult to realize; after the urea solution is prepared, the problems of pipeline blockage caused by crystallization and the like are easily caused by residual urea particles and solution.
The publication date is 2021 year 08 month 17 day, and chinese patent with publication number CN213966022U discloses a utility model of "a reductant urea solution preparation system for denitration" and provides a reductant urea solution preparation system for denitration, and it includes hot water supply device, hot water supply device includes demineralized water tank, temperature control unit, demineralized water tank is provided with the steam pipe and heats the demineralized water in the demineralized water tank, temperature control unit control demineralized water is heated to the settlement temperature after and stops heating, the delivery port of demineralized water tank passes through the circulating pump and passes through the tube coupling with the water inlet of jet mixer. The utility model directly heats the demineralized water in the demineralized water tank, improves the dissolving effect of the demineralized water and urea particles in the jet mixer, and the surface of the steam heating pipe is not easy to form attachments, thus the heating effect is not easy to be influenced; and set up the negative pressure dust remover at the buffer hopper top, the feed during operation carries out the negative pressure and removes dust, avoids causing the raise dust pollution. Although the patent can effectively dissolve urea particles, the dust pollution is avoided in the process; but does not relate to the problems of controllable urea solution preparation amount, stable and automatic operation, qualified urea solution concentration output automation and pipeline blockage caused by crystallization due to residual urea particles and solution.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a structural design safety and stability, energy consumption is low, degree of automation is high, enables the urea solution of urea system ammonia device and prepares the urea solution system of preparing of the continuous steady operation of system.
The utility model provides a technical scheme that above-mentioned problem adopted is: the utility model provides a urea solution of urea ammonia plant prepares system, characterized by, includes drain tank, urea feed bin, urea dissolving tank and urea solution holding vessel, the bottom of drain tank is connected to the urea dissolving tank through hydrophobic outlet pipe, install drain pump, electronic feed valve, electronic water supply governing valve and jet pump on the hydrophobic outlet pipe in proper order, the bottom of urea feed bin is connected to the urea dissolving tank through urea feeding pipe, and compressed air pipe divides two the tunnel to link to each other with urea feeding pipe and hydrophobic outlet pipe respectively, the bottom of urea dissolving tank is passed through the upper portion of urea solution conveyer pipe connection to urea solution holding vessel, install delivery pump, urea solution concentration meter and electronic delivery valve on the urea solution conveyer pipe in proper order, the mid-mounting of urea dissolving tank has the dissolving tank level meter, the upper portion of urea dissolving tank is connected with the urea solution circulating pipe, the urea solution circulating pipe is connected to the urea solution conveying pipe, and an electric circulating valve is installed on the urea solution circulating pipe.
Furthermore, the upper part of the drain tank is connected with a steam drain pipe, and an electric valve is installed on the steam drain pipe.
Furthermore, a vacuum breaker pipe is connected to the urea feeding pipe, and a vacuum breaker valve is mounted on the vacuum breaker pipe.
Furthermore, a feeding purge valve is arranged on a branch of the compressed air pipe connected with the urea feeding pipe, and the connection point of the branch and the urea feeding pipe is positioned at the upstream of the vacuum breaking pipe; and a pipeline cleaning valve is arranged on a branch of the compressed air pipe connected with the drain outlet pipe, and the connection point of the branch and the drain outlet pipe is positioned at the downstream of the jet pump.
Furthermore, the bottom of the urea dissolving tank is connected with a drain pipe, and a drain valve is installed on the drain pipe.
Furthermore, the connection point of the urea solution circulating pipe and the urea solution delivery pipe is positioned between the urea solution concentration meter and the electric delivery valve.
Further, still including dissolving tank level controller, electronic water supply governing valve and dissolving tank level gauge all are connected with dissolving tank level controller, dissolving tank level controller receives the signal of electronic water supply governing valve and dissolving tank level gauge to according to the opening of the electronic water supply governing valve of signal control of dissolving tank level gauge.
Further, still include urea solution concentration controller, urea solution concentration meter, electronic delivery valve and electronic circulating valve all are connected with urea solution concentration controller, urea solution concentration controller receives the signal of urea solution concentration meter, electronic delivery valve and electronic circulating valve to according to the signal control electronic delivery valve of urea solution concentration meter and the aperture of electronic circulating valve.
Compared with the prior art, the utility model, have following advantage and effect: (1) the utility model has the advantages of safe and stable integral structure design, low energy consumption and high automation degree, and thoroughly solves the problem of unstable preparation and operation of the urea solution of the prior urea ammonia production device; (2) the utility model realizes the automatic suction of urea particles by installing the jet pump, and the urea particles are sucked into the urea dissolving tank from the storage bin by the jet pump and are completely dissolved in water in the continuous operation process, thereby avoiding the need of manual feeding preparation and reducing the workload; (3) the utility model designs a dissolving tank liquid level controller automatic control, can realize urea granule complete dissolution, urea solution preparation volume's regulation and urea dissolving tank liquid level stability, has reached urea solution balance, urea solution preparation volume controllable and operation stable automation; (4) the utility model designs a urea solution concentration controller for automatic control, which can realize the qualified continuous output of the urea solution concentration and achieve the automatic operation of the qualified output of the urea solution concentration; (5) the utility model discloses after urea solution preparation is accomplished, designed urea feed pipe, hydrophobic outlet pipe and swept the link, remained urea granule and solution in with the system and swept, avoided remaining the problem that causes the crystallization to block up the pipeline because of urea granule and solution.
Drawings
Fig. 1 is a schematic structural diagram of a system according to an embodiment of the present invention.
In the figure: the system comprises an electric valve 1, a drain tank 2, a drain pump 3, an electric water supply valve 4, an electric water supply regulating valve 5, a jet pump 6, a pipeline cleaning valve 7, a feeding purge valve 8, a vacuum breaker valve 9, a urea bin 10, a urea dissolving tank 11, a dissolving tank liquid level meter 12, a blow-down valve 13, a delivery pump 14, a urea solution concentration meter 15, an electric delivery valve 16, an electric circulating valve 17, a urea solution storage tank 18, a dissolving tank liquid level controller 19, a urea solution concentration controller 20, a steam drain pipe 21, a drain outlet pipe 22, a compressed air pipe 23, a urea feeding pipe 24, a blow-down pipe 25, a urea solution delivery pipe 26, a urea solution circulating pipe 27 and a vacuum breaker pipe 28. Wherein, the dissolving tank liquid level controller 19 and the urea solution concentration controller 20 adopt the existing products.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Examples are given.
Referring to fig. 1, in this embodiment, a urea solution preparation system of a urea ammonia production device includes a drain tank 2, a urea bin 10, a urea dissolving tank 11 and a urea solution storage tank 18, the upper portion of the drain tank 2 is connected with a steam drain pipe 21, the steam drain pipe 21 is provided with an electric valve 1, the bottom of the drain tank 2 is connected to the urea dissolving tank 11 through a drain outlet pipe 22, the drain outlet pipe 22 is sequentially provided with a drain pump 3, an electric water supply valve 4, an electric water supply regulating valve 5 and a jet pump 6, the bottom of the urea bin 10 is connected to the urea dissolving tank 11 through a urea feeding pipe 24, the urea feeding pipe 24 is connected with a vacuum breaking pipe 28, the vacuum breaking pipe 28 is provided with a vacuum breaking valve 9, a compressed air pipe 23 is divided into two paths and respectively connected with the urea feeding pipe 24 and the drain outlet pipe 22, the bottom of the urea dissolving tank 11 is connected to the upper portion of the urea solution storage tank 18 through a urea solution delivery pipe 26, install delivery pump 14, urea solution concentration meter 15 and electronic delivery valve 16 on the urea solution conveyer pipe 26 in proper order, the mid-mounting of urea dissolving tank 11 has dissolving tank level gauge 12, the upper portion of urea dissolving tank 11 is connected with urea solution circulating pipe 27, urea solution circulating pipe 27 is connected to urea solution conveyer pipe 26, install electronic circulating valve 17 on the urea solution circulating pipe 27, the bottom of urea dissolving tank 11 is connected with blow off pipe 25, install blowoff valve 13 on the blow off pipe 25.
In this embodiment, the feeding purge valve 8 is installed on the branch of the compressed air pipe 23 connected to the urea feeding pipe 24, and the connection point of the branch to the urea feeding pipe 24 is located upstream of the vacuum breaking pipe 28; a pipeline cleaning valve 7 is arranged on a branch of the compressed air pipe 23 connected with the hydrophobic outlet pipe 22, and the connection point of the branch and the hydrophobic outlet pipe 22 is positioned at the downstream of the jet pump 6; the connection point of the urea solution circulation pipe 27 and the urea solution delivery pipe 26 is located between the urea solution concentration meter 15 and the electric delivery valve 16.
In this embodiment, the system further includes dissolving tank liquid level controller 19, and electric water supply regulating valve 5 and dissolving tank level meter 12 all are connected with dissolving tank liquid level controller 19, and dissolving tank liquid level controller 19 receives the signal of electric water supply regulating valve 5 and dissolving tank level meter 12 to according to the opening of the signal control electric water supply regulating valve 5 of dissolving tank level meter 12.
In this embodiment, the system further includes a urea solution concentration controller 20, the urea solution concentration meter 15, the electric delivery valve 16 and the electric circulation valve 17 are all connected to the urea solution concentration controller 20, and the urea solution concentration controller 20 receives signals from the urea solution concentration meter 15, the electric delivery valve 16 and the electric circulation valve 17, and controls the opening degrees of the electric delivery valve 16 and the electric circulation valve 17 according to the signals from the urea solution concentration meter 15.
The working method comprises the following steps:
heating the pipe: opening the electric valve 1, draining steam with certain pressure and flow into the drain tank 2, draining water with enough liquid level in the drain tank 2 after a period of time, closing the electric valve 1, opening the vacuum breaking valve 9 and the blow-down valve 13, closing the pipeline cleaning valve 7 and the feeding purge valve 8, opening the electric water supply valve 4 and the electric water supply regulating valve 5 to 20%, starting the drain pump 3, and performing drain outlet pipe 22 warming; heating the pipe for 20-30 minutes, closing the drain pump 3 and the blow-down valve 13 when the water discharged from the blow-down valve 13 is clear and no foreign matters exist, and finishing heating the pipe; the purpose of the warm pipe is mainly to make the drain outlet pipe 22 reach a proper temperature so as to prevent the urea solution from crystallizing to block the pipeline in the preparation process;
preparing and operating a urea solution: opening the electric valve 1, draining steam with certain pressure and flow into the drain tank 2, and draining water with enough liquid level in the drain tank 2 after a period of time; feeding a urea bin 10 till the urea is sufficiently prepared; opening the electric water supply valve 4, the vacuum breaking valve 9, the blow-down valve 13 and the electric circulating valve 17, opening the electric water supply regulating valve 5 to 20%, closing the pipeline cleaning valve 7, the feeding and purging valve 8 and the electric conveying valve 16, and putting the dissolving tank liquid level meter 12 into service; starting the drain pump 3 and the jet pump 6, opening the electric water supply regulating valve 5 from 20% to 50% after the operation is stable for a period of time, closing the vacuum breaking valve 9 and the blow-off valve 13, sucking urea in the urea bin 10 into the drain outlet pipe 22 through the urea feeding pipe 24 under the action of negative pressure, and converging the urea and the drain of the drain outlet pipe 22 into the urea dissolving tank 11 for dissolving; when a certain liquid level exists in the urea dissolving tank 11, starting the delivery pump 14, putting the urea solution concentration meter 15 into use, and circulating the urea solution in the urea dissolving tank 11 through the delivery pump 14, the urea solution delivery pipe 26 and the urea solution circulating pipe 27; after a certain time, the urea solution concentration meter 15 measures that the concentration of the urea solution in the urea solution delivery pipe 26 is qualified, the electric delivery valve 16 is opened, the electric circulating valve 17 is closed, and the urea solution with qualified concentration in the urea dissolving tank 11 is delivered to the urea solution storage tank 18 through the delivery pump 14 and the electric delivery valve 16; after the electric delivery valve 16 is opened and the electric circulating valve 17 is closed, attention is paid to adjusting the opening degree of the electric water supply adjusting valve 5, and the liquid level of the dissolving tank liquid level meter 12 is kept stable; when the liquid level in the urea dissolving tank 11 is stable, the liquid level controller 19 of the dissolving tank is put into use, and the liquid level of the urea dissolving tank 11 is controlled by controlling the opening of the electric water supply regulating valve 5 and is stably maintained to operate within a certain liquid level range; meanwhile, a urea solution concentration controller 20 can be used, when the concentration of the urea solution concentration meter 15 is qualified, the electric conveying valve 16 is automatically opened, the electric circulating valve 17 is automatically closed, when the concentration of the urea solution concentration meter 15 is unqualified, the electric conveying valve 16 is automatically closed, and the electric circulating valve 17 is automatically opened; therefore, the urea solution preparation system operates normally, and the automatic preparation and stable operation of the continuous water adding and feeding system is achieved, so that the continuous output of the urea solution with qualified concentration is realized;
urea solution preparation and shutdown: the dissolving tank liquid level controller 19 and the urea solution concentration controller 20 are switched from automatic operation to manual operation, the delivery pump 14 and the electric delivery valve 16 are closed, and the electric circulating valve 17 is opened; opening the vacuum breaking valve 9, stopping the jet pump 6 and the drain pump 3, and closing the electric water supply valve 4 and the electric valve 1; closing the vacuum breaking valve 9, opening the pipeline cleaning valve 7 and the feeding purging valve 8, and purging the urea particles and the urea aqueous solution in the urea feeding pipe 24 and the drainage outlet pipe 22 respectively; after purging for 10-20 minutes, the pipeline cleaning valve 7 and the feeding purging valve 8 are closed, the vacuum breaking valve 9 is opened, and the urea solution preparation stops running.
In the embodiment, the system realizes the automatic suction of urea by the jet pump 6, manual feeding and preparation are not needed, and the workload is reduced; meanwhile, the liquid level of the urea dissolving tank 11 is stable, the concentration of the urea solution is qualified, and the automatic operation of urea dissolving and urea solution output is realized by automatically controlling the liquid level controller 19 and the urea solution concentration controller 20 of the urea dissolving tank, so that the system is stable in operation, reliable and durable.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should not be construed as being limited to the scope of the present invention, and any modifications and alterations made by those skilled in the art without departing from the spirit and scope of the present invention should fall within the scope of the present invention.
Claims (8)
1. The utility model provides a urea solution of urea system ammonia device prepares system, characterized by, including drain tank (2), urea feed bin (10), urea dissolving tank (11) and urea solution holding vessel (18), the bottom of drain tank (2) is connected to urea dissolving tank (11) through hydrophobic outlet pipe (22), install drain pump (3), electronic feed valve (4), electronic water supply governing valve (5) and jet pump (6) on hydrophobic outlet pipe (22) in proper order, urea feed pipe (24) are connected to urea dissolving tank (11) in the bottom of urea feed bin (10), and compressed air pipe (23) divide two the tunnel to link to each other with urea feed pipe (24) and hydrophobic outlet pipe (22) respectively, urea dissolving tank's (11) bottom is connected to the upper portion of urea solution holding vessel (18) through urea solution conveyer pipe (26), install in proper order on urea solution conveyer pipe (26) and send pump (14), Urea solution concentration meter (15) and electronic delivery valve (16), the mid-mounting of urea dissolving tank (11) has dissolving tank level gauge (12), the upper portion of urea dissolving tank (11) is connected with urea solution circulating pipe (27), urea solution circulating pipe (27) are connected to urea solution delivery pipe (26), install electronic circulation valve (17) on urea solution circulating pipe (27).
2. The urea solution preparation system of the urea ammonia production device according to claim 1, wherein a steam trap (21) is connected to an upper portion of the steam trap (2), and an electric valve (1) is installed on the steam trap (21).
3. The urea solution preparation system of a urea ammonia plant according to claim 1, wherein a vacuum breaking pipe (28) is connected to the urea feeding pipe (24), and a vacuum breaking valve (9) is installed on the vacuum breaking pipe (28).
4. The urea solution preparation system of a urea-based ammonia plant as recited in claim 3, wherein a feed purge valve (8) is installed in a branch of said compressed air pipe (23) connected to said urea feed pipe (24), and a connection point of said branch to said urea feed pipe (24) is located upstream of said vacuum breaking pipe (28); and a pipeline cleaning valve (7) is arranged on a branch of the compressed air pipe (23) connected with the hydrophobic outlet pipe (22), and the connection point of the branch and the hydrophobic outlet pipe (22) is positioned at the downstream of the jet pump (6).
5. The urea solution preparation system of the urea ammonia production device according to claim 1, wherein a drain pipe (25) is connected to the bottom of the urea dissolving tank (11), and a drain valve (13) is installed on the drain pipe (25).
6. The urea solution preparation system of an ammonia plant, as recited in claim 1, wherein the connection point of said urea solution circulation pipe (27) and said urea solution delivery pipe (26) is located between said urea solution concentration meter (15) and said electric delivery valve (16).
7. The urea solution preparation system of the urea ammonia production device according to claim 1, further comprising a dissolving tank level controller (19), wherein the electric water supply regulating valve (5) and the dissolving tank level meter (12) are both connected to the dissolving tank level controller (19).
8. The urea solution preparation system of the urea ammonia production device according to claim 1 or 7, further comprising a urea solution concentration controller (20), wherein the urea solution concentration meter (15), the electric delivery valve (16) and the electric circulation valve (17) are connected to the urea solution concentration controller (20).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220459156.6U CN217312820U (en) | 2022-03-04 | 2022-03-04 | Urea solution preparation system of urea ammonia production device |
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| CN202220459156.6U CN217312820U (en) | 2022-03-04 | 2022-03-04 | Urea solution preparation system of urea ammonia production device |
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