CN211170514U - Ammonium-containing value-added urea production system - Google Patents
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- CN211170514U CN211170514U CN201922087427.0U CN201922087427U CN211170514U CN 211170514 U CN211170514 U CN 211170514U CN 201922087427 U CN201922087427 U CN 201922087427U CN 211170514 U CN211170514 U CN 211170514U
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Abstract
The utility model discloses a contain ammonium sulfate appreciation urea production system solves prior art and handles the big technical problem of granulation tail gas energy consumption in urea production process. The utility model comprises an ammonium sulfate liquid storage tank, a synergist preparation tank, a synergist storage tank for storing synergist raw material solution, a synergist injection pump connected with the synergist preparation tank pipeline, and a synergist feeding heater connected with the synergist injection pump pipeline and used for heating the synergist solution and conveying the heated synergist solution for an ammonium sulfate value-added urea granulation section; the synergist storage tank is connected with the synergist preparation tank through a pipeline and used for conveying the synergist raw material solution to the synergist preparation tank. The utility model discloses with value-added urea production system and urea device granulation tail gas pickling system coproduction, the solvent of synergist in the dilute ammonium salt solution that makes the pickling produce is as value-added urea production system, saves the evaporative concentration step in the urea device granulation tail gas pickling system simultaneously, and is energy-conserving showing.
Description
Technical Field
The utility model relates to a value-added urea production technical field, concretely relates to contain ammonium sulfate value-added urea production system.
Background
China is a large country for urea production, and the current situations of urea production and application currently have the following problems:
(1) Excess capacity: the excess of nitrogen fertilizer production has become one of the outstanding problems in the industry. At present, the surplus of the annual capacity can still reach more than ten million tons in China except for the factor of demand growth. The method can realize the adjustment and optimization upgrading of the product structure as soon as possible, improve the core competitiveness of the industry, and actively transfer the excess capacity to high-end products, which is a problem that nitrogenous fertilizer enterprises must face.
(2) The fertilizer utilization rate is low: at present, the utilization rate of nitrogen fertilizer in China is only 25-35%, the average rate is only 33.3%, and the percentage is 10-15% lower than that of developed countries. The fertilizer utilization rate is generally low, direct economic loss and resource waste are caused, and pollution is caused to the ecological environment through volatilization, leaching and runoff.
(3) Environmental pollution: when the urea is applied to soil, the nitrogen can be absorbed by plants through links such as dissolution, ammoniation, nitration and the like. Because the time for 3 processes of dissolving, ammoniation and nitration is short, the plant can only utilize about 30% of the total nitrogen content, and most of nitrogen is lost through a plurality of processes of loss of urea aqueous solution, volatilization of gaseous nitrogen and escape of nitration state. This not only aggravates the greenhouse effect, but also causes the eutrophication of rivers and lakes, and the nitrate nitrogen content of groundwater and crops exceeds the standard. The fertilizer remained in the soil can cause the soil structure to be deteriorated, the volume quality to be increased, the porosity to be reduced, and the rising speed of organic matters in the soil to be slowed down or even reduced. This is also one of the important causes of the deterioration of the soil texture of agricultural fields.
Therefore, the development of a fertilizer Value-added technology or the development of a Value-added fertilizer has become a new demand. The value-added fertilizer is one of the important directions for researching novel fertilizers at home and abroad. Urea value-added technology is also called urea synergistic technology, and generally refers to technology for improving the utilization rate of urea by improving the performance of urea. The current approaches of urea value-added modification technology mainly comprise 3 aspects: the first is the modification and synergism of a slow release method, and mainly the nitrogen nutrient can be slowly or controllably released. Such as coated slow-release urea, which comprises various forms of organic material coating, inorganic nutrient material coating and the like; the urea reacts with formaldehyde and the like to synthesize the slightly soluble urea formaldehyde fertilizer, which is also an important method for slow release modification and synergism of the urea. The second is stabilization modification synergy, which is mainly to add urease inhibitor or nitrification inhibitor and the like into the urea product, so that the conversion of urea in soil is delayed, the stability of urea nitrogen is improved, and the loss and volatilization are reduced. And thirdly, the synergist is modified and synergistic, and the modified urea product is generally called as value-added urea, wherein bioactive substances such as various processed and modified substances such as algin, humic acid or amino acid and the like are mainly added into the urea, so that the stability of nitrogen in the urea can be improved, the growth and absorption activity of root systems of crops can be promoted, and the yield increase effect of the urea is improved.
Urea is the main variety of chemical nitrogen fertilizer in China and accounts for 65 percent of the total nitrogen fertilizer consumption. The urea nitrogen fertilizer has strong activity, more loss ways and low utilization rate. A large number of studies at home and abroad prove that the nitrogen fertilizer which is not utilized by crops can not be directly remained in soil basically. The nitrogen fertilizer utilization rate of farmland in China is always at a lower level, the average nitrogen fertilizer utilization rate of field crops in China is only about 30 percent, and the average nitrogen fertilizer utilization rate is obviously lower than the utilization rate level of 50 to 60 percent in developed countries. In 2011, the amount of urea consumed by agriculture in China exceeds 5000 million T (urea commodity amount), the amount of the urea lost through volatilization, leaching, runoff and other ways reaches more than 2000 million tons (urea commodity amount), and 500 billion yuan RMB is directly lost economically, so that huge waste of energy and resources is caused, and the environment is greatly threatened. The method is an important way for improving the utilization rate of nitrogen fertilizer, reducing loss and reducing environmental risk by carrying out value-added modification on common urea and developing new value-added urea products.
The value-added urea is a urea value-added product produced by adding part of equipment on the basis of basically not changing the urea production process and directly adding a bioactive synergist into urine. The synergist is a substance which is obtained by modifying natural substances such as algin, humic acid, amino acid and the like and can improve the utilization rate of the urea nitrogen fertilizer. The value-added urea product should comply with the following principles: 1) w (N) is not less than 46 percent, and the nitrogen content meets the national standard of urea products; 2) the quality standard of the value-added urea with the synergist can be established, and the method has conventional detectability; 3) the synergist is trace and efficient, and the addition amount is not more than 1%; 4) the process is simple and the cost is low; 5) the synergist is natural substance and its extract or composition, and is harmless to environment, crops and human body. According to incomplete statistics, at least twenty kinds of synergists are used in China currently, and mainly comprise polypeptide, nitrogen fertilizer inhibitors, alginic acid, humic acid and the like. The main characteristics of the value-added urea product are simple process, low cost, less addition of the synergist, high nutrient utilization rate and the like.
At present, in the urea production process, tail gas generated by granulation contains part of volatile ammonia, in order to reduce the emission of ammonia, an acid washing mode is usually adopted, diluted acid solution (such as sulfuric acid, nitric acid and the like) is used for washing the granulation tail gas, ammonia in the tail gas is neutralized, and the ammonia discharged in an empty mode is reduced.
Therefore, the application designs a sulfur ammonium salt (ammonium sulfate) -containing value-added urea production system, the value-added urea production system and a urea device granulation tail gas pickling system are co-produced, dilute ammonium salt solution (such as ammonium sulfate solution) generated by pickling is used as a solvent of a synergist in the value-added urea production system, the evaporation concentration step in the urea device granulation tail gas pickling system is omitted, dilute ammonium salt solution generated by pickling and the synergist (such as polypeptide, a nitrogen fertilizer inhibitor, alginic acid, humic acid and the like) are configured and efficiently mixed, then ammonium salt is used as an effective fertilizer component and the synergist component and is sent to a granulation unit (a granulation tower or a fluidized bed granulation nozzle) of the value-added urea production system to produce the value-added urea containing ammonium salt (ammonium sulfate), and the technical problem to be solved by technical personnel in the technical field is urgently needed.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: provides a value-added urea production system containing ammonium sulfate, which solves the technical problem of large energy consumption in the prior art of treating granulation tail gas in the urea production process.
In order to achieve the above object, the utility model adopts the following technical scheme:
A production system of ammonium sulfate-containing value-added urea comprises an ammonium sulfate liquid storage tank, a synergist preparation tank, a synergist storage tank, a synergist injection pump and a synergist feeding heater, wherein the ammonium sulfate liquid storage tank is connected with a urea granulation tail gas acid washing section pipeline and used for collecting an ammonium salt solution in an acid washing process; the synergist storage tank is connected with the synergist preparation tank through a pipeline and is used for conveying a synergist raw material solution to the synergist preparation tank.
Furthermore, a high-efficiency liquid-liquid jet mixer is arranged in the synergist preparation tank, and the high-efficiency liquid-liquid jet mixer is connected with a liquid outlet pipeline of the synergist injection pump through a pipeline.
Furthermore, a pipeline connecting the ammonium sulfate liquid storage tank and the synergist preparation tank is provided with an ammonium sulfate liquid delivery pump for pumping the ammonium salt solution in the ammonium sulfate liquid storage tank to the synergist preparation tank.
Furthermore, a synergist conveying pump for pumping the synergist raw material solution in the synergist storage tank into the synergist preparation tank is arranged on a pipeline connecting the synergist storage tank and the synergist preparation tank.
Further, a bypass pipe is connected between the synergist preparation tank and the synergist storage tank.
Furthermore, a bypass valve is arranged on the bypass pipe.
Further, the synergist storage tank is connected with a synergist discharging reciprocating pump used for discharging outsourcing barreled synergist raw material solution to the synergist storage tank through a pipeline.
Further, the synergist discharging reciprocating pump is connected with an air compressor.
Further, the outlet of the heated synergist solution of the synergist feeding heater is connected with the inlet of a urea melting pump at the upstream of the urea granulation section through a pipeline.
Compared with the prior art, the utility model discloses following beneficial effect has:
The utility model discloses with value-added urea production system and urea device granulation tail gas pickling system coproduction, the solvent of synergist in the dilute ammonium salt solution that makes the pickling produce (like ammonium sulfate solution) as value-added urea production system, the evaporative concentration step in saving urea device granulation tail gas pickling system simultaneously, dilute ammonium salt solution and synergist (like polypeptide, nitrogen fertilizer inhibitor, alginic acid and humic acid etc.) configuration that make the pickling produce, the high efficiency is mixed, then the ammonium salt is together as an effective fertilizer composition and synergist composition, send into value-added urea production system's granulation unit (prilling tower or fluidized bed granulation shower nozzle), the value-added urea that contains ammonium salt (ammonium sulfate) is produced.
The utility model discloses the value-added urea nitrogen content of production accords with urea product national standard, and simple process implements easily, only needs to carry out a small amount of transformation on current urea production device system, and the cost of increase is low, can effectively reduce the synergist addition, and the additive composition can be pluralism, and the nutrient high-usage, fertilization method is simple, and corrosivity is little, and market demand is big, stores the transportation convenience.
Drawings
FIG. 1 is a system configuration diagram of the ammonium sulfate-containing value-added urea production system of the present invention.
Wherein, the names corresponding to the reference numbers are:
The system comprises a 1-ammonium sulfate liquid storage tank, a 2-ammonium sulfate liquid delivery pump, a 3-synergist unloading reciprocating pump, a 4-synergist storage tank, a 5-synergist delivery pump, a 6-synergist preparation tank, a 7-high-efficiency liquid-liquid injection mixer, an 8-synergist injection pump, a 9-synergist feeding heater, a 10-bypass pipe, an 11-bypass valve and a 12-air compressor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus, it should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; of course, mechanical connection and electrical connection are also possible; alternatively, they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
As shown in figure 1, the utility model provides a pair of contain ammonium sulfate appreciation urea production system, simple structure, design scientific and reasonable, convenient to use. The utility model discloses a thiamine liquid storage tank 1, thiamine liquid delivery pump 2, synergist reciprocating pump 3, synergist storage tank 4, synergist delivery pump 5, synergist preparation groove 6, high-efficient liquid jet mixer 7, synergist injection pump 8, synergist feeding heater 9, bypass pipe 10, bypass valve 11 and air compressor 12 of unloading, thiamine liquid storage tank 1 and urea granulation tail gas pickling workshop section pipe connection are used for collecting acid cleaning in-process ammonium salt solution, synergist preparation groove 6 with thiamine liquid storage tank 1 pipe connection is used for preparing synergist solution, be equipped with on the pipeline that thiamine liquid storage tank 1 with synergist preparation groove 6 is connected and is used for with ammonium salt solution pump in thiamine liquid storage tank 1 extremely thiamine liquid delivery pump 2 in synergist preparation groove 6, synergist injection pump 8 with synergist preparation groove 6 pipe connection, a high-efficiency liquid-liquid jet mixer 7 is arranged in the synergist preparation tank 6, the high-efficiency liquid-liquid jet mixer 7 is connected with a liquid outlet pipeline of the synergist injection pump 8 through a pipeline, a solution in the synergist preparation tank 6 is circularly mixed by the high-efficiency liquid-liquid jet mixer 7 under the action of the synergist injection pump 8, the synergist storage tank 4 is used for storing a synergist raw material solution, the synergist feeding heater 9 is connected with the synergist injection pump 8 through a pipeline and is used for heating the synergist solution and conveying the heated synergist solution for a thiamine value-added urea granulation section, specifically, a heated synergist solution outlet of the synergist feeding heater 9 is connected with a urea melting pump inlet at the upstream of the urea granulation section through a pipeline, the synergist storage tank 4 is connected with the synergist preparation tank 6 through a pipeline and is used for conveying the synergist raw material solution for the synergist preparation tank 6, a pipeline connecting the synergist storage tank 4 and the synergist preparation tank 6 is provided with a synergist delivery pump 5 for pumping the synergist raw material solution in the synergist storage tank 4 into the synergist preparation tank 6, and a bypass pipe 10 is connected between the synergist preparation tank 6 and the synergist storage tank 4. The bypass pipe 10 is provided with a bypass valve 11. The synergist storage tank 4 is connected with a synergist discharging reciprocating pump 3 for discharging outsourcing barreled synergist raw material solution to the synergist storage tank 4 through a pipeline. The synergist discharging reciprocating pump 3 is connected with an air compressor 12.
The utility model discloses with value-added urea production system and urea device granulation tail gas pickling system coproduction, the solvent of synergist in the dilute ammonium salt solution that makes the pickling produce (like ammonium sulfate solution) as value-added urea production system, the evaporative concentration step in saving urea device granulation tail gas pickling system simultaneously, dilute ammonium salt solution and synergist (like polypeptide, nitrogen fertilizer inhibitor, alginic acid and humic acid etc.) configuration that make the pickling produce, the high efficiency is mixed, then the ammonium salt is together as an effective fertilizer composition and synergist composition, send into value-added urea production system's granulation unit (prilling tower or fluidized bed granulation shower nozzle), the value-added urea that contains ammonium salt (ammonium sulfate) is produced.
The utility model discloses the value-added urea nitrogen content of production accords with urea product national standard, and simple process implements easily, only needs to carry out a small amount of transformation on current urea production device system, and the cost of increase is low, can effectively reduce the synergist addition, and the additive composition can be pluralism, and the nutrient high-usage, fertilization method is simple, and corrosivity is little, and market demand is big, stores the transportation convenience.
The utility model also provides a production method of containing ammonium sulfate appreciation urea production system, collect the ammonium salt solution that comes from urea granulation tail gas pickling workshop section and regard as the solvent of synergist for the appreciation urea production, configure into synergist solution according to the proportion that appreciation urea production required, will dispose in synergist solution heats the urea melt pump of carrying into appreciation urea granulation workshop section upper reaches to 70 ~ 75 ℃ after in to the appreciation urea granulation workshop section is sent into appreciation urea granulation workshop section and is pelletized the shaping appreciation urea together with the melting urea through this urea melt pump. The production method of the utility model is well combined with the urea device (large granule granulation device or high tower granulation is suitable), the flow is simple, the investment is saved, and the consumption is low.
As shown in fig. 1, the utility model provides a production method is for collecting in coming from urea device granulation process (fluidized bed granulation or tower spray granulation), ammonium salt that the pickling formed through granulation tail gas is like ammonium sulfate solution (other acides also can), as the solvent of value added composition additive, and certain proportion of value added composition such as polypeptide, polyaspartic acid zinc, material (one of them composition) such as humic acid etc. dispose the intensive mixing back according to the proportion, by synergist injection pump, through synergist feeding heater heating synergist solution to about 70 ~ 75 ℃, in adding the urea melt liquid of urea device granulation process upper reaches, then directly send granulator (granulation shower nozzle) to produce the many first-component value added urea granule that contains ammonium sulfate through the granulation by the molten urea liquid pump.
The utility model discloses production system includes: the system comprises an ammonium sulfate liquid storage tank, an ammonium sulfate liquid delivery pump, a synergist unloading reciprocating pump, a synergist storage tank, a synergist delivery pump, a synergist preparation tank, a high-efficiency liquid-liquid jet mixer, a synergist injection pump, a synergist feeding heater, a bypass pipe, a bypass valve and an air compressor. The dilute ammonium sulfate solution and the synergist are mixed and configured, the utility model discloses production system still disposes the synergist and pours into measurement system.
The specific process flow is as follows:
Ammonium salt such as ammonium sulfate solution (other acids can also be used) formed by acid washing of granulation tail gas in a granulation process (fluidized bed granulation or tower spray granulation) of a urea device is collected in an ammonium sulfate solution storage tank 1 to be used as a solvent of a value-added component additive, and then the ammonium sulfate solution is pumped to a synergist preparation tank 6 by an ammonium sulfate solution delivery pump 2 according to a certain flow rate to be fully mixed with a synergist.
The purchased barreled synergist solution (polypeptide or polyaspartic acid zinc or humic acid and other substances, one synergist) is unloaded by a synergist unloading reciprocating pump 3 and stored in a synergist storage tank 4 for heat preservation. The synergist solution stored in the synergist storage tank 4 is pumped to the synergist preparation tank 6 by a synergist delivery pump 5 according to a certain flow rate.
In a synergist preparation tank 6, a certain proportion of ammonium sulfate solution and synergist solution are delivered to a high-efficiency liquid-liquid jet mixer 7 from an outlet of a synergist injection pump 8 through a majority of pressurized circulating liquid, the synergist is fully mixed in the synergist preparation tank 6 to prevent the synergist from layering or generating precipitation, the mixed synergist is heated to about 70-75 ℃ by a synergist injection pump 8 through a synergist feeding heater 9, added into an inlet of a urea melting pump at the upstream of a granulation process of a urea device, and then directly delivered to a granulator (granulation nozzle) through a molten urine pump to produce the ammonium sulfate-containing multi-element value-added urea granules through granulation. The flow direction (flowing to the high-efficiency liquid-liquid jet mixer 7 or flowing to the synergist feeding heater 9) of the solution in the synergist preparation tank 6 after passing through the synergist injection pump 8 can be controlled by simply setting a valve, and the valve setting for controlling the flow direction belongs to the prior art and is not described in detail.
The value-added urea product specification containing ammonium sulfate (ammonium salt) prepared by the system of the utility model is as follows:
1. Ammonium sulfate (ammonium salt) and humic acid value increase urea product specification (expected value):
2. Ammonium sulfate (ammonium salt) and polypeptide value-added urea product specifications (expected values):
Finally, it should be noted that: the above embodiments are only preferred embodiments of the present invention to illustrate the technical solution of the present invention, but not to limit the same, and certainly not to limit the scope of the present invention; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention; that is, the technical problems solved by the present invention are still consistent with the present invention, and all the modifications or colors made in the spirit and the idea of the main design of the present invention are included in the protection scope of the present invention; in addition, will the technical scheme of the utility model direct or indirect application is in other relevant technical field, all including on the same reason the utility model discloses an in the patent protection scope.
Claims (9)
1. The system for producing the ammonium sulfate-containing value-added urea is characterized by comprising an ammonium sulfate liquid storage tank (1) which is connected with a urea granulation tail gas acid washing working section pipeline and used for collecting an ammonium salt solution in an acid washing process, a synergist preparation tank (6) which is connected with the ammonium sulfate liquid storage tank (1) pipeline and used for preparing a synergist solution, a synergist storage tank (4) used for storing a synergist raw material solution, a synergist injection pump (8) which is connected with the synergist preparation tank (6) pipeline, and a synergist feeding heater (9) which is connected with the synergist injection pump (8) pipeline and used for heating the synergist solution and conveying the heated synergist solution to the ammonium sulfate value-added urea granulation working section; the synergist storage tank (4) is connected with the synergist preparation tank (6) through a pipeline and is used for conveying a synergist raw material solution to the synergist preparation tank (6).
2. The system for producing ammonium sulfate-containing value-added urea as claimed in claim 1, wherein the synergist preparation tank (6) is provided with a high efficiency liquid-liquid jet mixer (7), and the high efficiency liquid-liquid jet mixer (7) is connected with the liquid outlet pipeline of the synergist injection pump (8) through a pipeline.
3. The system for producing ammonium sulfate-containing value-added urea as claimed in claim 1, wherein a pipe connecting the ammonium sulfate liquid storage tank (1) and the synergist preparation tank (6) is provided with an ammonium sulfate liquid delivery pump (2) for pumping the ammonium salt solution in the ammonium sulfate liquid storage tank (1) to the synergist preparation tank (6).
4. The system for producing ammonium sulfate-containing value-added urea as claimed in claim 1, wherein a synergist delivery pump (5) for pumping the synergist raw material solution in the synergist storage tank (4) to the synergist preparation tank (6) is arranged on a pipeline connecting the synergist storage tank (4) and the synergist preparation tank (6).
5. A value added urea production system containing ammonium sulphate according to claim 1 characterised in that a by-pass line (10) is connected between the synergist formulation tank (6) and the synergist storage tank (4).
6. A value added urea production system containing ammonium sulphate according to claim 5 characterised in that the by-pass line (10) is provided with a by-pass valve (11).
7. The system for producing ammonium sulfate-containing value-added urea as claimed in claim 1, wherein the synergist storage tank (4) is connected with a synergist discharge reciprocating pump (3) for discharging outsourced barreled synergist raw material solution to the synergist storage tank (4) through a pipeline.
8. A system for producing ammonium sulphate-containing value added urea according to claim 7 wherein the synergist discharge reciprocating pump (3) is connected to an air compressor (12).
9. The system for producing ammonium sulphate-containing value-added urea of claim 1 wherein the outlet of the heated synergist solution from the synergist feed heater (9) is connected via a pipe to the inlet of the urea melt pump upstream of the urea granulation section.
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