CN219809052U - Comprehensive utilization system for recycling synthesis ammonia residual pressure energy - Google Patents
Comprehensive utilization system for recycling synthesis ammonia residual pressure energy Download PDFInfo
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- CN219809052U CN219809052U CN202320391282.7U CN202320391282U CN219809052U CN 219809052 U CN219809052 U CN 219809052U CN 202320391282 U CN202320391282 U CN 202320391282U CN 219809052 U CN219809052 U CN 219809052U
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- ammonia
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- liquid
- liquid ammonia
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 253
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 84
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 35
- 238000003786 synthesis reaction Methods 0.000 title claims abstract description 35
- 238000004064 recycling Methods 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 20
- 230000005540 biological transmission Effects 0.000 claims description 8
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 6
- 239000004202 carbamide Substances 0.000 claims description 6
- 238000011084 recovery Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000009987 spinning Methods 0.000 abstract 1
- 238000000926 separation method Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000618 nitrogen fertilizer Substances 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011143 downstream manufacturing Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The utility model discloses a comprehensive utilization system for recycling synthesis ammonia residual pressure energy, which solves the problem that the existing synthesis ammonia residual pressure energy cannot be effectively recycled. The technical scheme includes that the ammonia synthesis device comprises an ammonia synthesis loop, a high-pressure ammonia separator, a medium-pressure ammonia separator and a liquid ammonia storage tank which are sequentially connected, wherein an outlet of the ammonia synthesis loop is connected with the high-pressure ammonia separator through a high-pressure reducing valve, and the high-pressure ammonia separator is connected with the medium-pressure ammonia separator through a medium-pressure reducing valve; the front pipeline and the rear pipeline of the high-pressure reducing valve are respectively connected with an inlet and an outlet of a driving turbine of the liquid ammonia expansion generating set. The utility model has the advantages of simple spinning, high residual pressure energy utilization rate, continuous operation and high equipment operation reliability.
Description
Technical Field
The utility model relates to the field of ammonia liquor synthesis, in particular to a comprehensive utilization system for recycling synthesis ammonia residual pressure energy.
Background
In recent years, along with the great rise of energy prices of coal, natural gas, electric power and the like, the production cost of the high energy consumption industry of synthetic ammonia is obviously increased, the rise of electricity price and the like requires the whole nitrogenous fertilizer industry to further optimize the flow in design, and feasible energy-saving measures are established, so that the energy consumption is reduced, and the method has important significance for optimizing the productivity of the whole nitrogenous fertilizer industry.
The prior advanced ammonia synthesis technology in industry adopts a middle-low pressure ammonia synthesis flow, and liquid ammonia produced by ammonia synthesis is decompressed and separated by a high-middle ammonia separator and then sent to a downstream urea or other process units. The operation pressure of the ammonia synthesis process is usually 12-16 MPaG, and the consumption of high-pressure energy occupies a large proportion in the whole system operation, which is one of the main factors influencing the product cost, so that the reasonable energy-saving process technology is searched, and the energy consumption is reduced, thereby the product cost is very necessary.
The cooled crude ammonia from the ammonia synthesis tower almost has the same pressure level as the synthesis process, namely 11-15 MPaG, the crude ammonia is generally subjected to high-pressure separation and medium-pressure separation to produce a liquid ammonia product, and in the process from the high-pressure separation of 11-15 MPaG to the medium-pressure separation of 2-5 MPaG, a pressure reducing valve and an orifice plate are generally directly adopted to reduce the pressure, the liquid pressure can be lost by white, and likewise, the liquid pressure energy loss exists in the process that the product liquid ammonia from the medium-pressure separator is sent to a liquid ammonia storage tank, and the liquid ammonia product is sent to downstream urea or other process units from the liquid ammonia storage tank, so that the pressurization is needed, the device consumption is repeatedly increased, and therefore, the method has important practical significance on how to reasonably utilize the residual pressure energy in the whole process, and the reduction of the consumption of the whole synthetic ammonia system and the product cost.
Disclosure of Invention
The utility model aims to solve the technical problems and provide a comprehensive utilization system for recycling the synthesis ammonia residual pressure energy, which has the advantages of extremely simple system, high residual pressure energy utilization rate, continuous operation and high equipment operation reliability.
The utility model discloses a comprehensive utilization system for recycling synthesis ammonia residual pressure energy, which comprises an ammonia synthesis loop, a high-pressure ammonia separator, a medium-pressure ammonia separator and a liquid ammonia storage tank which are sequentially connected, wherein an outlet of the high-pressure ammonia separator is connected with the medium-pressure ammonia separator through a high-pressure reducing valve, and the medium-pressure ammonia separator is connected with the liquid ammonia storage tank through a medium-pressure reducing valve; the front pipeline and the rear pipeline of the high-pressure reducing valve are respectively connected with an inlet and an outlet of a driving turbine of the liquid ammonia expansion generating set.
And the driving turbine of the liquid ammonia expansion generating set is connected with the liquid ammonia expansion generating set through a corresponding transmission device.
The front pipeline and the rear pipeline of the medium-pressure reducing valve are respectively connected with an inlet and an outlet of a driving turbine of the liquid ammonia booster pump.
The driving turbine of the liquid ammonia booster pump is connected with the ammonia booster pump through a corresponding transmission device.
The liquid ammonia storage tank is connected with downstream urea or other process units through a liquid ammonia booster pump.
And gas outlets at the tops of the high-pressure ammonia separator and the medium-pressure ammonia separator are connected with an ammonia synthesis loop.
The high-pressure reducing valve is a liquid level control valve, and a valve signal of the high-pressure reducing valve is jointly associated with a driving turbine operation signal of the liquid ammonia expansion generating set to form a liquid level controller of the high-pressure ammonia separator; the medium pressure reducing valve is a liquid level control valve, and a valve signal of the medium pressure reducing valve and a driving turbine running signal of the liquid ammonia booster pump are jointly associated with a medium pressure ammonia separator liquid level controller.
The utility model can fully utilize the pressure energy of the liquid ammonia after the high-pressure separation of the synthetic ammonia, so that the pressure energy of the liquid ammonia before decompression is fully utilized: the front-back pressure difference is about 10MPaG in the process of high pressure reduction and medium pressure, the pressure difference is large, the residual pressure energy is high, the recovered energy is converted into electric energy to be connected to the internet, the front-back pressure difference is about 1-3 MPaG in the process of medium pressure reduction and medium pressure, the pressure difference is smaller, the residual pressure energy is lower, the recovered energy is converted into mechanical energy to drive an ammonia liquid delivery pump to deliver materials, so that the process flows of an ammonia synthesis and ammonia storage delivery system are organically combined, and the system does not add other external energy input in the operation process.
The utility model has obvious energy-saving effect and economic benefit, can be widely applied to new ammonia synthesis flow, can also be used for energy-saving upgrading and reconstruction of the old system, and has simple structure, simple and convenient operation of matched equipment, stable operation and good reliability.
Drawings
FIG. 1 is a system diagram of the present utility model.
Wherein, 1-ammonia synthesis loop, 2-high pressure ammonia separator, 3-middling pressure ammonia separator, 4-liquid ammonia storage tank, 5-liquid ammonia booster pump, 6-liquid ammonia expansion generating set's drive turbine, 7-liquid ammonia expansion generating set, 8-liquid ammonia booster pump's drive turbine, 9-liquid ammonia booster pump, 10-high pressure relief valve, 11-middling pressure relief valve.
Detailed Description
The system of the present utility model is further explained below with reference to the drawings.
Referring to fig. 1, an ammonia synthesis loop 1, a high-pressure ammonia separator 2, a high-pressure reducing valve 10, a medium-pressure ammonia separator 3, a medium-pressure reducing valve 11, a liquid ammonia storage tank 4 and a liquid ammonia booster pump 5 in the system of the present utility model are connected in this order. The front pipeline and the rear pipeline of the high-pressure reducing valve 10 are respectively connected with an inlet and an outlet of a driving turbine 6 of the liquid ammonia expansion generating set, and the driving turbine 6 of the liquid ammonia expansion generating set is connected with a liquid ammonia expansion generating set 7 through a corresponding transmission device.
The front pipeline and the rear pipeline of the medium-pressure reducing valve 11 are respectively connected with an inlet and an outlet of a driving turbine 8 of the liquid ammonia booster pump, and the driving turbine 8 of the liquid ammonia booster pump is connected with the liquid ammonia booster pump 5 through a corresponding transmission device.
The liquid ammonia storage tank 4 is connected with downstream urea or other process units through a liquid ammonia booster pump 5.
The gas outlets at the tops of the high-pressure ammonia separator 2 and the medium-pressure ammonia separator 3 are connected with the ammonia synthesis loop 1.
In this embodiment, the driving turbine 6 of the liquid ammonia expansion generator set and the driving turbine 8 of the liquid ammonia booster pump are both liquid ammonia expansion machines.
Referring to fig. 1, the high-pressure reducing valve 10 and the medium-pressure reducing valve 11 are liquid level control valves, and a valve signal of the high-pressure reducing valve 10 is associated with a liquid level controller of the high-pressure ammonia separator 2 together with an operation signal of a driving turbine 6 of the liquid ammonia expansion generating set; the valve signal of the medium pressure reducing valve 11 and the operation signal of the driving turbine 8 of the liquid ammonia booster pump are jointly associated with the liquid level controller of the medium pressure ammonia separator 3 so as to realize centralized control and continuous operation.
The technical process comprises the following steps:
crude ammonia (pressure is 11-15 MPaG) produced by the ammonia synthesis loop 1 enters a high-pressure ammonia separator 2 to separate high-pressure liquid ammonia (pressure is 11-15 MPaG), the separated circulating gas returns to the ammonia synthesis loop 1, the high-pressure liquid ammonia is sent to a medium-pressure ammonia separator 3 through a high-pressure reducing valve 10, and the pressure difference between the front and the back of the reducing valve 10 is about 10MPaG. When the starting process is started, the valve is in normal opening, the driving turbine 6 of the liquid ammonia expansion generating set does not start to work, part of high-pressure liquid ammonia is sent to the driving turbine 6 of the liquid ammonia expansion generating set by reducing the opening of the high-pressure reducing valve 10, the liquid ammonia returns to the outlet of the high-pressure reducing valve 10 after being depressurized by the liquid ammonia expander, the operation working condition is continuously adjusted to keep the liquid level of the high-pressure ammonia separator 2 stable until all high-pressure liquid ammonia enters the medium-pressure ammonia separator 3 through the driving turbine 6 of the liquid ammonia expansion generating set, and the expander converts the recovered high-pressure energy into electric energy through a transmission device, such as a matched speed reducer, an asynchronous generator, a grid-connected cabinet and the like, and the pressure energy of the high-pressure liquid ammonia is converted into electric energy and is connected to the internet;
the liquid ammonia is delivered to a medium-pressure ammonia separator 3 after the pressure reduction, the separated flash steam is returned to an ammonia synthesis loop 1, the separated ammonia product (the pressure is 2-5 MPaG), the liquid ammonia is delivered to a liquid ammonia storage tank 4 through a medium-pressure reducing valve 11, the operating pressure of the liquid ammonia storage tank 4 is 0.5-2 MPaG, the pressure difference between the front and the back of the reducing valve is 1-3 MPaG, the liquid ammonia product delivered from the liquid ammonia storage tank 4 is delivered to urea or other downstream process devices after being pressurized by a liquid ammonia booster pump 5 (the pressure is 2.5 MPaG), when the starting process is started, the medium-pressure reducing valve 11 is at a normal opening, a driving turbine 8 of the liquid ammonia booster pump does not start working, and by reducing the opening of the medium-pressure reducing valve 11, the method is characterized in that part of medium-pressure liquid ammonia is fed into a driving turbine 8 of a liquid ammonia booster pump, the liquid ammonia returns to an outlet of a medium-pressure reducing valve 11 after being depressurized by an expander, the operation condition is adjusted so that the liquid level of a medium-pressure ammonia separator 3 is kept stable until all medium-pressure liquid ammonia enters a liquid ammonia storage tank 4 through a driving turbine 8 of the liquid ammonia booster pump, the medium-pressure liquid ammonia enters the liquid ammonia expander, the kinetic energy of liquid ammonia pressure energy is efficiently converted into the kinetic energy of a driving shaft rotating mechanical energy to directly drive a pump impeller of an ammonia liquid booster pump 5 to boost the pressure in an impeller of the expander, the purpose of boosting is achieved, and finally the pressure energy of the medium-pressure liquid ammonia is completely converted into the driving force of the liquid ammonia storage tank 4 to send the liquid ammonia outwards, so that the effect of no motor driving is achieved.
Taking an ammonia synthesis device with a production scale of 30 ten thousand tons in one year as an example,
1) Aiming at a high-pressure ammonia separator liquid ammonia expansion generating set:
the structure form of the common design is as follows: the system comprises an expansion machine, a speed reducer, an asynchronous generator, a grid-connected cabinet, a matched oil system and the like;
the inlet and outlet pressure of the expander is 14/3.6MPaG, the rotating speed of the expander/generator is 25800/3000rpm, the efficiency of the expander is 75%, the rated shaft power of the expander is 185kW, the rated grid-connected power of the corresponding generator is 168kW, and the energy consumption of the optimized scheme is reduced by 160kW compared with that of the traditional scheme due to smaller public engineering consumption of the unit;
2) Aiming at a medium-pressure ammonia separator liquid ammonia expansion booster pump:
the discharged material of the medium-pressure liquid ammonia separator enters a liquid ammonia expander, and the kinetic energy of the liquid ammonia pressure energy is efficiently converted into the rotational mechanical energy of a transmission shaft in an impeller of the expander to directly drive the pump impeller of the ammonia liquid delivery pump to boost, so that the task of boosting the liquid ammonia pump is realized.
Newly added functional benefit of liquid ammonia expansion booster pump:
the liquid level regulating and reducing valve of the medium-pressure ammonia separator is replaced to realize the functions of liquid level regulation and pressure reduction, the liquid ammonia booster pump 5 is driven by a motor to save power by about 35kwh, the reliability of the electrically driven liquid ammonia pump is improved, the maintenance cost is reduced, and the annual increase benefit is about 20 ten thousand yuan.
Claims (6)
1. The comprehensive utilization system for recycling the synthesis ammonia residual pressure energy comprises an ammonia synthesis loop, a high-pressure ammonia separator, a medium-pressure ammonia separator and a liquid ammonia storage tank which are sequentially connected, and is characterized in that an outlet of the high-pressure ammonia separator is connected with the medium-pressure ammonia separator through a high-pressure reducing valve, and the medium-pressure ammonia separator is connected with the liquid ammonia storage tank through a medium-pressure reducing valve; the front pipeline and the rear pipeline of the high-pressure reducing valve are respectively connected with an inlet and an outlet of a driving turbine of the liquid ammonia expansion generating set.
2. The comprehensive utilization system for recovering synthesis ammonia pressure energy according to claim 1, wherein the driving turbine of the liquid ammonia expansion generator set is connected with the liquid ammonia expansion generator set through a corresponding transmission device.
3. The comprehensive utilization system for recycling the synthesis ammonia residual pressure energy according to claim 1, wherein the front pipeline and the rear pipeline of the medium-pressure reducing valve are respectively connected with an inlet and an outlet of a driving turbine of the liquid ammonia booster pump.
4. The comprehensive utilization system for recovering synthesis ammonia residual pressure energy according to claim 3, wherein the driving turbine of the liquid ammonia booster pump is connected with the liquid ammonia booster pump through a corresponding transmission device.
5. The synthesis ammonia pressure energy recovery and comprehensive utilization system according to any one of claims 1-4, wherein the liquid ammonia storage tank is connected with downstream urea or other process units through a liquid ammonia booster pump.
6. The comprehensive utilization system for recycling the synthesis ammonia residual pressure energy according to any one of claims 1 to 4, wherein the high-pressure reducing valve is a liquid level control valve, and a valve signal of the high-pressure reducing valve is jointly related to a liquid level controller of the high-pressure ammonia separator with a driving turbine operation signal of a liquid ammonia expansion generator set; the medium pressure reducing valve is a liquid level control valve, and a valve signal of the medium pressure reducing valve and a driving turbine running signal of the liquid ammonia booster pump are jointly associated with a medium pressure ammonia separator liquid level controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320391282.7U CN219809052U (en) | 2023-03-06 | 2023-03-06 | Comprehensive utilization system for recycling synthesis ammonia residual pressure energy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320391282.7U CN219809052U (en) | 2023-03-06 | 2023-03-06 | Comprehensive utilization system for recycling synthesis ammonia residual pressure energy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219809052U true CN219809052U (en) | 2023-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320391282.7U Active CN219809052U (en) | 2023-03-06 | 2023-03-06 | Comprehensive utilization system for recycling synthesis ammonia residual pressure energy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219809052U (en) |
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2023
- 2023-03-06 CN CN202320391282.7U patent/CN219809052U/en active Active
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