CN214360282U - Urea hydrolysis ammonia dehydration system - Google Patents
Urea hydrolysis ammonia dehydration system Download PDFInfo
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- CN214360282U CN214360282U CN202023165471.8U CN202023165471U CN214360282U CN 214360282 U CN214360282 U CN 214360282U CN 202023165471 U CN202023165471 U CN 202023165471U CN 214360282 U CN214360282 U CN 214360282U
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Abstract
A urea hydrolysis ammonia dehydration system comprises a dehydration condenser and a product steam inlet pipe; the dehydration condenser is provided with a refrigerant cavity, a condensation cavity, a refrigerant inlet pipe, a medium outlet pipe and a condensation coil pipe, wherein the condensation coil pipe is provided with a pipe plate and a plurality of condensation pipes, the condensation pipes are provided with an inlet end and an outlet end which are communicated with the refrigerant cavity, and pipelines which are positioned in the condensation cavity and are not communicated with the condensation cavity, the product steam inlet pipe directly stretches into the condensation cavity so as to separate the product steam after the pyrolysis of the urea solution from the ammonia water of the product steam inlet pipe to obtain the ammonia gas or water (condensate) with lower water content, the corrosivity of the ammonia gas with higher water content to equipment is reduced, and the water can be further recycled, so that the manufacturing cost is greatly reduced, and the water resource is saved.
Description
Technical Field
The utility model relates to a urea system of hydrolysising in the thermal power factory especially relates to a urea of ammonia dehydration after urea solution hydrolysises hydrolyzes ammonia dewatering system.
Background
The urea solution is often decomposed into ammonia gas in a thermal power plant, so that subsequent denitration is facilitated, the environmental protection requirement is met, and the urea solution has two processes of a urea hydrolysis system or a urea catalytic hydrolysis system. In the urea hydrolysis reaction process system, 50 percent of urea solution is heated to 130-170 ℃ by steam, so that urea and water are subjected to hydrolysis reaction to generate ammonia.
The chemical reaction is as follows:
(NH2)2CO+H2O→CO2↑+2NH3↑
in the process of preparing ammonia by urea catalytic hydrolysis, analytically pure ammonium dihydrogen phosphate is mixed with 50 percent of urea solution according to a certain proportion and heated to the temperature of 135-160 ℃ to accelerate urea hydrolysis to generate ammonia gas. Wherein the ammonium dihydrogen phosphate acts as a catalyst in the chemical reaction.
The chemical reaction is as follows:
(NH2)2CO+3H2O→CO2↑+2NH4OH
2NH4OH+2NH4H2PO4→2(NH4)2HPO4+2H2O
2(NH4)2HPO4→2NH4H2PO4+2NH3↑
the comprehensive reaction of urea hydrolysis and catalytic hydrolysis is the same, and the gas components in the product are the same naturally, wherein the mass component ratio is NH3:CO2:H2O＝0.283：0.367：0.35。
In the actual engineering operation process, no matter urea hydrolysis or urea catalytic hydrolysis, crystallization and corrosion's problem all appear in the operation process, and the product of crystallization is mostly biuret, white massive thing such as ammonium polyphosphate (APP), and the crystal in the reactor is more and more, not only influences the output of preparation ammonia, to reaction unit and pipeline component, important valve instrument has certain corrosivity simultaneously, is unfavorable for the long-term operation of equipment.
The crystal has the following performance properties: colorless and transparent, does not burn and melt at 500 ℃ in an alcohol lamp ignition test, and hardly dissolves at 100 ℃ in a normal pressure boiling water test. More and more crystals in the reactor not only affect the yield of the prepared ammonia gas, but also have certain corrosivity on reaction equipment, pipeline elements and important valve instruments, and are not beneficial to long-term operation of the equipment. Meanwhile, according to the different concentrations of the urea solution used in the power plant, the water content in the product steam is up to 35-48 percent, even higher, and the desalted water is greatly wasted. If the part of water vapor is condensed and recycled, the problem that the product vapor with water is crystallized to corrode pipelines, equipment and instruments can be solved, the service lives of the equipment, valves and instruments are prolonged, the ammonia gas is purified, the operability of adjustment and control is improved, the recycled desalted water is used for redissolving the urea, and the desalted water of at least 1/3 can be saved for a urea hydrolysis system.
Therefore, it is necessary to design a new urea hydrolysis ammonia dehydration system to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a low cost further improves anticorrosive urea ammonia dewatering system of hydrolysising.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a urea hydrolysis ammonia dehydration system comprises a dehydration condenser and a product steam inlet pipe; the dehydration condenser is provided with a refrigerant cavity, a condensation cavity, a refrigerant inlet pipe, a medium outlet pipe and a condensation coil pipe, wherein the condensation coil pipe is provided with a pipe plate and a plurality of condensation pipes, the pipe plate is used for isolating the medium exchange between the refrigerant cavity and the condensation cavity, the condensation pipe is provided with an inlet end and an outlet end which are communicated with the refrigerant cavity, and a pipeline which is positioned in the condensation cavity and is not communicated with the condensation cavity, the refrigerant cavity is provided with an inlet cavity and an outlet cavity which are divided into non-communicated parts, the inlet cavity is respectively communicated with the inlet end of the condensation pipe and the refrigerant inlet pipe, the outlet cavity is communicated with the outlet end of the condensation pipe and the medium outlet pipe, the product steam inlet pipe protrudes into the condensation cavity, the lower end of the condensation cavity is provided with a liquid discharge port and an ammonia gas discharge port which is positioned in the middle section of the condensation cavity, the liquid discharge port is used for discharging condensed condensate of the product steam, and the ammonia gas after condensation is discharged from the ammonia gas discharge port.
The utility model discloses further improvement measure has: the part of the product steam inlet pipe protruding into the condensation cavity is provided with a plurality of through holes.
The utility model discloses further improvement measure has: the tail end of the product steam inlet pipe is of a closed structure.
The utility model discloses further improvement measure has: the outside of the pipeline of the dehydration condenser is wrapped with a wire removing net for adsorbing condensate, and the wire removing net is provided with a plurality of holes.
The utility model discloses further improvement measure has: urea hydrolysis ammonia dewatering system is equipped with and is fixed in the guide board that removes the silk screen, and this guide board will remove the condensate drainage in the silk screen to the condensation intracavity.
The utility model discloses further improvement measure has: the urea hydrolysis ammonia dehydration system comprises a control system, wherein the control system is provided with a temperature regulation system, and the temperature regulation system is provided with a temperature transmission interlock connected with a condensation cavity and a regulation door connected with a refrigerant inlet pipe.
The utility model discloses further improvement measure has: the control system has a pressure regulation system having a pressure transmission interlock connected to the condensing chamber and an ammonia regulator valve connected to the product vapor inlet line.
The utility model discloses further improvement measure has: the urea hydrolysis ammonia dehydration system is provided with an adjusting bypass connected with a refrigerant medium inlet and an adjusting valve positioned on the adjusting bypass.
The utility model discloses further improvement measure has: the product steam temperature in the product steam inlet pipe is higher than 130 ℃, and the ammonia gas temperature of the ammonia gas outlet is controlled at 106 ℃ of 100-.
The utility model discloses further improvement measure has: the pressure in the condensation chamber is controlled within 0.15-0.25 Mpa.
The utility model discloses further improvement measure has: the liquid content of the product gas is higher than 35%, and the liquid content of the ammonia gas in the ammonia gas discharge port is lower than 16.9%.
The utility model has the advantages of as follows, set up the dehydrating condenser in the ammonia dehydration system through urea hydrolysis, the ammonia moisture separation after the urea solution pyrolysis goes out the condensate after moisture content ammonia or condensation, reduces the corrosivity of the ammonia that contains water to equipment, and water can further be cyclic utilization, greatly reduced manufacturing cost, water economy resource.
Drawings
FIG. 1 is a schematic diagram of a urea hydrolysis ammonia dehydration system of the present invention;
FIG. 2 is a schematic view of a part of the structure of the urea hydrolysis ammonia dehydration system of the present invention;
fig. 3 is a partially enlarged view of fig. 2.
Detailed Description
Referring to fig. 1 to 3, for convenience of description, a general urea hydrolysis method or a catalytic hydrolysis method is generally referred to as urea hydrolysis, and will not be described in detail hereinafter. The urea hydrolysis ammonia dehydration system comprises a dehydration condenser 1, a product steam inlet pipe 2 and a control system, wherein the control system comprises a temperature regulation system and a pressure regulation system. In the embodiment, the temperature of the ammonia gas is controlled to be 100-106 ℃, and the pressure in the dehydration condenser 1 is controlled to be 0.15-0.25Mpa by the pressure regulation system, so that the dehydration condensation effect can reach the best state, compared with the prior art, about 1/3 of desalted water can be saved, the dehydration is for convenience of description, and of course, a small amount of other substances may be contained in the product steam, and the substance after the product steam is separated can be called as condensate.
The dehydration condenser 1 has a refrigerant chamber 11, a condensation chamber 12, a refrigerant inlet pipe 13, a medium outlet pipe 14 and a condensation coil. The refrigerant cavity 11 has an inlet cavity 110 and an outlet cavity 111 which are divided into two parts which are not communicated with each other, the lower end of the condensation cavity is provided with a liquid outlet 3 and an ammonia gas outlet 4 which is positioned at the middle section of the condensation cavity, the liquid outlet 3 is used for discharging condensed liquid after product steam is condensed, and can also be regarded as water, and the ammonia gas outlet 4 is used for discharging condensed ammonia gas, which will be described in detail later. In the present embodiment, the refrigerant medium is water or air, and the dehydration condenser has a fan or a pump communicating with the refrigerant inlet pipe 13, and air or water is supplied into the refrigerant inlet pipe 13 by the fan or the pump.
Of course, the condensate may contain water, oil and other substances, and because the density of the water is different from that of the oil, namely the density of the separated oil is precipitated at the bottom layer, the two liquids are easily separated at the bottom of the condensation cavity, and the water is discharged to achieve the purpose of recovering the water, and the water can be used as a solution for dissolving urea, so that the water can be fully recycled, and the waste of water resources is reduced.
The condensing coil is provided with a tube plate 15 and a plurality of condensing tubes 16, the tube plate 15 isolates medium exchange between the refrigerant cavity 11 and the condensing cavity 12, the condensing tubes 16 are provided with an inlet end 160 and an outlet end 161 which are communicated with the refrigerant cavity 11, and a pipeline 162 which is positioned in the condensing cavity 12 and is not communicated with the condensing cavity, the inlet cavity 110 is respectively communicated with the inlet end 160 and the refrigerant inlet pipe 13 of the condensing tube 16, and the outlet cavity 161 is communicated with the outlet end 111 and the medium outlet pipe 14 of the condensing tube 12, so that a refrigerant medium circulation path is formed.
Product vapour inlet tube 2 passes in the protruding condensation chamber 12 that stretches into behind the refrigerant chamber 11, and protruding product vapour inlet tube 2 of stretching into in the condensation chamber 12 has a plurality of through-holes 20, in this embodiment, this product vapour inlet tube 2 is equipped with closing plate 21, and the end of product vapour inlet tube is not communicated with refrigerant chamber 11, prevent that product vapour from the end directly rushing into condensation chamber 12, can't realize product vapour and condenser pipe 16's abundant contact, influence the condensation effect of product vapour, of course, in other implementation modes, the end of this product vapour inlet tube 2 also can form a small amount of through-holes, make things convenient for abundant and condenser pipe 16 contact after the product vapour removes to condense.
The pipeline outside of the condenser pipe 16 of dehydration condenser 1 is wrapped up in and is adsorbed the silk screen 5 that removes of condensate to be equipped with and be fixed in the guide board 6 that removes the silk screen, this guide board 6 is installed in the outside that removes silk screen 5, should remove silk screen 5 and have several through-hole 50, make things convenient for the condenser pipe 16 to be separated by the liquid after condensing out the condenser pipe, and guide board 6 has and will remove in the condensate drainage in the silk screen 5 instils into condensation chamber 12, prevent that the pipeline is peripheral to be plugged up to the condensate, can't fully contact product vapour with the pipeline.
The temperature adjusting system is provided with a temperature transmission interlocking 71 connected with the condensation cavity 12 and an adjusting door 72 connected with a refrigerant inlet pipe; the pressure regulating system is provided with a pressure transmission interlocking 81 connected with the condensation cavity and an ammonia regulating valve 82 connected with a product steam inlet pipe, and the temperature regulating system and the pressure regulating system are respectively input into the coal burning control chamber together with the denitration system, so that the temperature and the pressure in the condensation cavity 12 can be conveniently regulated; that is, when the temperature of the control room detection temperature transmission interlocking 71 displayed in the condensation cavity 12 is small, the amount of refrigerant medium entering the refrigerant cavity can be controlled through the adjusting door 72, of course, when the control room detection pressure transmission interlocking 81 displays that the pressure in the condensation cavity 12 is too large, the size of the product steam entering the condensation cavity 12 can be controlled through the ammonia adjusting valve 82, the two are kept balanced, a powerful condensation effect is provided, the adjustment and control mode can be directly input through computer control, and unstable factors caused by artificial control are reduced. In the embodiment, the temperature regulating system can control the ammonia gas temperature to be 100-106 ℃, and the pressure regulating system can control the pressure in the dehydration condenser 1 to be 0.15-0.25Mpa, so that the dehydration condensation effect reaches the optimal state, and compared with the prior art, the method can save about 1/3 of desalted water; namely before the product steam is condensed, the water content of the product steam is higher than 35%, after the product steam is condensed by the method, the water content of the ammonia gas at the ammonia gas outlet is lower than 16.9%, the mass component of the ammonia gas is improved to 34.3%, and 64% of water vapor is removed.
The dehydration condenser 1 is provided with an adjusting bypass 17 connected with the refrigerant inlet pipe 13 and an adjusting valve 18 positioned on the adjusting bypass, and because the flow entering the refrigerant inlet pipe 13 is too large, partial flow can be discharged by controlling the adjusting valve 18 of the adjusting disk 17, namely when the flow of the refrigerant inlet pipe 13 is larger than the required flow, the partial flow is discharged outwards by adjusting the bypass 17, and the refrigerant flow is conveniently controlled.
The urea hydrolysis ammonia dehydration system can also be realized by adopting the following method, namely a urea hydrolysis ammonia dehydration system method, which provides the urea hydrolysis ammonia dehydration system, and the dehydration method comprises the following steps:
firstly, the method comprises the following steps: a refrigerant medium is input into the refrigerant inlet pipe 13 and flows out from the medium outlet pipe 14 after passing through the condensing pipe 16;
secondly, the method comprises the following steps: the product steam after hydrolysis is introduced into the product steam inlet pipe 2, enters the condensation cavity 12, fully contacts the condensation pipe 16, and is subjected to cold-medium cold-heat exchange with the condensation pipe 16, the product steam is cooled and is solidified and decomposed into condensate and ammonia gas, the ammonia gas is input into the SCR reactor through the ammonia gas outlet 4, and the condensate is deposited at the lower end of the condensation cavity, so that the cyclic utilization is facilitated, and the environment is protected.
In this embodiment, when the product vapor temperature in the product vapor inlet pipe 2 is higher than 130 ℃, the ammonia gas temperature at the ammonia gas outlet is controlled to be 106 ℃ below 100 ℃; the pressure in the condensation cavity 12 is controlled within 0.15-0.25Mpa, the two reach balance, so that the water (condensate) of the product steam reaches the best dehydration effect, and after a plurality of experiments, the desalted water of about 1/3 can be saved.
In the embodiment, detection shows that before product steam is condensed, the water content of the product steam is higher than 35%, but after the product steam is condensed by the method, the water content of ammonia in the ammonia gas exhaust port is lower than 16.9%, so that the safety of ammonia gas exhaust air is greatly improved, the environmental pollution is reduced, and condensate condensed by the method is deposited at the lower end of the condensation cavity 12 and is input into the urea dissolver again from the liquid exhaust port 4 to be recycled, and the manufacturing cost is reduced.
As described further below, in the experimental mode of the embodiment of the present invention, generally, the urea hydrolysis or urea catalytic hydrolysis system, collectively referred to as urea hydrolysis system, is prepared by using 50% by mass of urea solution as a raw material, and the mass concentration of ammonia in the product gas is 28.3%; the mass concentration of carbon dioxide is 35.7 percent, and the mass concentration of water vapor is 35 percent.
Please refer to the following table, when the temperature of the ammonia gas in the ammonia gas outlet is controlled at 100-; when the pressure in the condensation chamber 12 is controlled within 0.15-0.25Mpa, about 1/3-saving demineralized water is found, the manufacturing cost is greatly reduced, and water resources are saved.
As can be seen from the table, the consumption of the desalted water can be saved by 1929 tons per year in terms of a urea hydrolysis or catalytic hydrolysis system producing 600kg of ammonia per hour, and the cost of the desalted water can be saved by 100294 yuan, so that the manufacturing cost is reduced.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
Claims (8)
1. The urea hydrolysis ammonia dehydration system is characterized in that: comprises a dehydration condenser and a product steam inlet pipe; the dehydration condenser is provided with a refrigerant cavity, a condensation cavity, a refrigerant inlet pipe, a medium outlet pipe and a condensation coil pipe, wherein the condensation coil pipe is provided with a pipe plate and a plurality of condensation pipes, the pipe plate is used for isolating the medium exchange between the refrigerant cavity and the condensation cavity, the condensation pipe is provided with an inlet end and an outlet end which are communicated with the refrigerant cavity, and a pipeline which is positioned in the condensation cavity and is not communicated with the condensation cavity, the refrigerant cavity is provided with an inlet cavity and an outlet cavity which are divided into non-communicated parts, the inlet cavity is respectively communicated with the inlet end of the condensation pipe and the refrigerant inlet pipe, the outlet cavity is communicated with the outlet end of the condensation pipe and the medium outlet pipe, the product steam inlet pipe protrudes into the condensation cavity, the lower end of the condensation cavity is provided with a liquid discharge port and an ammonia gas discharge port which is positioned in the middle section of the condensation cavity, the liquid discharge port is used for discharging condensed condensate of the product steam, and the ammonia gas after condensation is discharged from the ammonia gas discharge port.
2. The urea hydrolysis ammonia dehydration system of claim 1, characterized in that: the part of the product steam inlet pipe protruding into the condensation cavity is provided with a plurality of through holes.
3. The urea hydrolysis ammonia dehydration system of claim 2, characterized in that: the tail end of the product steam inlet pipe is of a closed structure.
4. The urea hydrolysis ammonia dehydration system of claim 1, characterized in that: the outside of the pipeline of the dehydration condenser is wrapped with a wire removing net for adsorbing condensate, and the wire removing net is provided with a plurality of holes.
5. The urea hydrolysis ammonia dehydration system of claim 4, characterized in that: the dehydration condenser is provided with a guide plate fixed on the screen mesh, and the guide plate guides condensate in the screen mesh to the condensing cavity.
6. The urea hydrolysis ammonia dehydration system of claim 1, characterized in that: the urea hydrolysis ammonia dehydration system is provided with a control system, the control system comprises a temperature adjusting system, and the temperature adjusting system is provided with a temperature transmission interlock connected with a condensation cavity and an adjusting door connected with a refrigerant inlet pipe.
7. The urea hydrolysis ammonia dehydration system of claim 6, characterized in that: the control system has a pressure regulation system having a pressure transmission interlock connected to the condensing chamber and an ammonia regulator valve connected to the product vapor inlet line.
8. The urea hydrolysis ammonia dehydration system of claim 6, characterized in that: the urea hydrolysis ammonia dehydration system is provided with an adjusting bypass connected with a refrigerant medium inlet and an adjusting valve positioned on the adjusting bypass.
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| CN112499649A (en) * | 2020-12-24 | 2021-03-16 | 昆山市三维换热器有限公司 | Urea hydrolysis ammonia dehydration system and method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112499649A (en) * | 2020-12-24 | 2021-03-16 | 昆山市三维换热器有限公司 | Urea hydrolysis ammonia dehydration system and method thereof |
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