CN203483880U - Novel energy-saving liquid ammonia evaporation system - Google Patents
Novel energy-saving liquid ammonia evaporation system Download PDFInfo
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- CN203483880U CN203483880U CN201320488286.3U CN201320488286U CN203483880U CN 203483880 U CN203483880 U CN 203483880U CN 201320488286 U CN201320488286 U CN 201320488286U CN 203483880 U CN203483880 U CN 203483880U
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Abstract
The utility model provides a novel energy-saving liquid ammonia evaporation system. The novel energy-saving liquid ammonia evaporation system comprises a liquid ammonia storage tank, a liquid ammonia supplying pump, a liquid ammonia evaporator, an ammonia gas buffering tank, an ammonia gas bypath, a pressure transmitter P1, a pressure transmitter P2, a pneumatic shut-off valve A, a pneumatic adjusting valve B1, a pneumatic shut-off valve A2, a pneumatic adjusting valve B2 and a liquid ammonia evaporation system control module. The novel energy-saving liquid ammonia evaporation system is simple and reliable in structure and is flexible and convenient to control; system power consumption and steam consumption can be reduced under the condition that the environment temperature is high, so that the operation cost is reduced. The novel energy-saving liquid ammonia evaporation system has a good practical value and a wide application prospect in a selective catalytic reduction (SCR) flue gas denitrification technology in the field of an environmental protection technology.
Description
Technical field
The utility model relates to a kind of liquefied ammonia vapo(u)rization system of novel energy-conserving, and it is applicable to for equipment for denitrifying flue gas, provide the preparation system of denitrification reducing agent (ammonia) under various environment temperatures.SCR (SCR) gas denitrifying technology that belongs to environmental technology field.
Background technology
The atmosphere pollution producing after coal combustion mainly contains sulfur dioxide, nitrogen oxide, flue dust (pellet) and as the carbon dioxide of greenhouse gases.Due to coal fire discharged and vehicular emission, the pollution of the nitrogen oxide of China is very serious.
In recent years, raising gradually along with environmental requirement, in order to reduce the discharge capacity of smoke evacuation nitrogen oxide in tail gas, the boiler of many industries (as electric power, chemical industry, iron and steel, cement, waste incineration etc.) and other equipment (as cement kiln, sintering machine etc.) are set up equipment for denitrifying flue gas one after another.
Current SCR (SCR) denitrating flue gas method, because its efficiency is high, stable performance, is widely used in engineering both domestic and external, becomes the mainstream technology that smoke evacuation tail gas removes nitrogen oxide.SCR denitrating system refers under the effect of catalyst, by spray into ammonia in flue gas, the reduction of nitrogen oxide in flue gas is become to nitrogen G&W, and environment is not caused to secondary pollution.For providing denitrating system required ammonia, three kinds, its total liquefied ammonia in source, ammoniacal liquor and urea, the feature such as wherein liquefied ammonia, investment cost simple and reliable with its system and operating cost be low, becomes the first-selection in denitrating system ammonia source.
Conventional liquefied ammonia Evaporation preparation ammonia system adopts liquid ammonia evaporator conventionally, by steam heating liquid ammonia, becomes ammonia.When environment temperature is lower, during liquefied ammonia insufficient pressure, also need to arrange liquefied ammonia transfer pump, improve the pressure of liquefied ammonia.
Utility model content
1, object: the purpose of this utility model is to provide a kind of liquefied ammonia vapo(u)rization system of novel energy-conserving.It has overcome the deficiencies in the prior art, simple and reliable for structure, controls flexibly and easily, obviously reduces system power consumption and steam consumption quantity.
2, technical scheme: in order to reach foregoing invention object, the technical solution of the utility model realizes as follows:
(1) a kind of liquefied ammonia vapo(u)rization system of novel energy-conserving, it is characterized in that, it comprises liquid ammonia storage tank, liquefied ammonia transfer pump, liquid ammonia evaporator, ammonia surge tank, ammonia bypass, pressure transmitter P1, pressure transmitter P2, pneumatic cut-off valve A1, pneumatic control valve B1, pneumatic cut-off valve A2, pneumatic control valve B2 and liquefied ammonia vapo(u)rization system control module.See Fig. 1, the position annexation between them is: liquefied ammonia vapo(u)rization system control module is connected with pressure transmitter P1, pressure transmitter P2, pneumatic control valve B1, pneumatic control valve B2, pneumatic cut-off valve A1, pneumatic cut-off valve A2 and one end of liquefied ammonia transfer pump respectively by cable; The top of liquid ammonia storage tank is connected with one end of pressure transmitter P1, pneumatic cut-off valve A2 respectively by pipeline; The below of liquid ammonia storage tank is connected with one end of pneumatic cut-off valve A1 by pipeline; One end of liquefied ammonia transfer pump connects pneumatic cut-off valve A1, and the other end communicates with liquid ammonia evaporator, and liquid ammonia evaporator bottom is connected with steam pipeline and is provided with condensate drain outlet; Liquid ammonia evaporator top is connected with the entrance point of pneumatic control valve B1, and the port of export of pneumatic control valve B1 is connected to ammonia surge tank; Ammonia surge tank top is connected with one end of pressure transmitter P2, and its upper right quarter is provided with ammonia outlet, and its upper left quarter communicates with one end of ammonia bypass; The other end of ammonia bypass is connected with one end of pneumatic control valve B2, and the other end of pneumatic control valve B2 is connected with pneumatic cut-off valve A2.
This liquid ammonia storage tank is horizontal pressure vessel storage tank; This liquefied ammonia transfer pump is canned motor pump or other no-leakage pump type; This liquid ammonia evaporator is vertical or horizontal intermediate medium heat exchanger (thermal source adopts superheated steam or saturated vapor); This ammonia surge tank is vertical pressure vessel storage tank; This pneumatic cut-off valve A1 is explosion-proof type pneumatic ball valve; This pneumatic control valve B1 is explosion-proof type pneumatic control valve; This pneumatic cut-off valve A2 is explosion-proof type pneumatic ball valve; This pneumatic control valve B2 is explosion-proof type pneumatic ball valve; This liquefied ammonia vapo(u)rization system control module adopts PLC or DCS control system; This pressure transmitter P1, pressure transmitter P2 are conventional pressure transmitters.
(2) a liquefied ammonia vapo(u)rization system control method for novel energy-conserving, the method concrete steps are:
Step 1: when the value of pressure transmitter P2 is during lower than the pressure set points of ammonia surge tank, close pneumatic cut-off valve A2, open pneumatic cut-off valve A1, start liquefied ammonia transfer pump, in liquid ammonia evaporator, supply liquefied ammonia, liquefied ammonia is heated by steam and becomes ammonia in liquid ammonia evaporator, then enters ammonia surge tank, by regulating the aperture of pneumatic control valve B1, by the value stabilization of pressure transmitter P2 in pressure set points;
Step 2: when the value of pressure transmitter P2 is during greater than or equal to the pressure set points of ammonia surge tank, close pneumatic cut-off valve A1, stoppage in transit liquefied ammonia transfer pump and liquid ammonia evaporator, open pneumatic cut-off valve A2, pneumatic control valve B2 and ammonia bypass, ammonia in liquid ammonia storage tank is directly supplied ammonia surge tank, by regulating the aperture of pneumatic control valve B2, by the value stabilization of pressure transmitter P2 in pressure set points.
Wherein, the pressure set points in the ammonia surge tank described in above-mentioned steps is 0.2～0.6MPa.
The utility model principle and operating mode brief introduction are as follows:
Because liquefied ammonia is when more than 0 ℃, its saturated vapour pressure can meet the requirement of SCR denitrating system completely, therefore the utility model is designed with ammonia bypass, directly from liquid ammonia storage tank to ammonia surge tank, supplies ammonia, thereby has saved the power consumption of liquefied ammonia transfer pump and the steam consumption quantity of liquid ammonia evaporator.Liquefied ammonia evaporates required heat directly to be drawn from surrounding environment by liquid ammonia storage tank.The ammonia amount required due to SCR denitrating system is conventionally very little, and the surface area of liquid ammonia storage tank is larger, so liquid ammonia storage tank can be drawn to enough heats, and is unlikely to cause temperature in liquid ammonia storage tank to reduce mostly.The utility model has retained former liquefied ammonia transfer pump and liquid ammonia evaporator simultaneously, when environment temperature is lower, can in ammonia surge tank, provide stable ammonia to originate by liquid ammonia evaporator, guarantees the stable operation of SCR denitrating system.The utility model is suitable for the transformation of existing liquefied ammonia vapo(u)rization system simultaneously.
3, advantage and effect: the utility model system architecture is simple and reliable, control flexibly and easily, in not obvious increase equipment investment, in the situation that environment temperature is higher, can reduce system power consumption and steam consumption quantity, thereby reduce operating cost.
Accompanying drawing explanation
Fig. 1 is the utility model system architecture schematic diagram;
Fig. 2 is control method flow chart.
In figure, symbol description is as follows:
1 liquid ammonia storage tank; 2 liquefied ammonia transfer pumps; 3 liquid ammonia evaporators; 4 ammonia surge tanks; 5 ammonia bypasses; 6 pressure transmitter P1; 7 pressure transmitter P2; 8 pneumatic cut-off valve A1; 9 pneumatic control valve B1; 10 pneumatic cut-off valve A2; 11 pneumatic control valve B2.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described further.
(1) referring to Fig. 1, a kind of liquefied ammonia vapo(u)rization system of novel energy-conserving, it comprises liquid ammonia storage tank 1, liquefied ammonia transfer pump 2, liquid ammonia evaporator 3, ammonia surge tank 4 and ammonia bypass 5, pressure transmitter P16, pressure transmitter P27, pneumatic cut-off valve A18, pneumatic control valve B19, pneumatic cut-off valve A210, pneumatic control valve B211 and liquefied ammonia vapo(u)rization system control module.See Fig. 1, the position annexation between them is: liquefied ammonia vapo(u)rization system control module is connected with pressure transmitter P16, pressure transmitter P27, pneumatic control valve B19, pneumatic control valve B211, pneumatic cut-off valve A18, pneumatic cut-off valve A210 and one end of liquefied ammonia transfer pump 2 respectively by cable; The top of liquid ammonia storage tank 1 is connected with one end of pressure transmitter P16, pneumatic cut-off valve A210 respectively by pipeline; The below of liquid ammonia storage tank 1 is connected with one end of pneumatic cut-off valve A18 by pipeline; One end of liquefied ammonia transfer pump 2 connects pneumatic cut-off valve A18, and the other end communicates with liquid ammonia evaporator 3, and liquid ammonia evaporator 3 bottoms are connected with steam pipeline and are provided with condensate drain outlet; Liquid ammonia evaporator 3 tops are connected with the entrance point of pneumatic control valve B19, and the port of export of pneumatic control valve B19 is connected to ammonia surge tank 4; Ammonia surge tank 4 tops are connected with one end of pressure transmitter P27, and its upper right quarter is provided with ammonia outlet, and its upper left quarter communicates with one end of ammonia bypass 5; The other end of ammonia bypass 5 is connected with one end of pneumatic control valve B211, and the other end of pneumatic control valve B211 is connected with pneumatic cut-off valve A210.
This liquid ammonia storage tank 1 is horizontal pressure vessel storage tank; This liquefied ammonia transfer pump 2 is canned motor pump or canned motor pump or other no-leakage pump type; This liquid ammonia evaporator 3 is vertical or horizontal intermediate medium heat exchanger (thermal source adopts superheated steam or saturated vapor); This ammonia surge tank 4 is vertical pressure vessel storage tanks; This pneumatic cut-off valve A18 is explosion-proof type pneumatic ball valve; This pneumatic control valve B19 is explosion-proof type pneumatic control valve; This pneumatic cut-off valve A210 is explosion-proof type pneumatic ball valve; This pneumatic control valve B211 is explosion-proof type pneumatic control valve; Liquefied ammonia vapo(u)rization system control module is to adopt PLC or DCS control system.This pressure transmitter P16, pressure transmitter P27 are conventional pressure transmitters.
(2) referring to Fig. 2, a kind of liquefied ammonia vapo(u)rization system control method of novel energy-conserving, the method concrete steps are:
Step 1: when the value of pressure transmitter P27 is during lower than the pressure set points of ammonia surge tank 4, close pneumatic cut-off valve A210, open pneumatic cut-off valve A18, start liquefied ammonia transfer pump 2, in liquid ammonia evaporator 3, supply liquefied ammonia, liquefied ammonia is heated by steam and becomes ammonia in liquid ammonia evaporator 3, then enters ammonia surge tank 4, by regulating the aperture of pneumatic control valve B19, by the value stabilization of pressure transmitter P27 in pressure set points;
Step 2: when the value of pressure transmitter P27 is during greater than or equal to the pressure set points of ammonia surge tank 4, close pneumatic cut-off valve A18, stoppage in transit liquefied ammonia transfer pump 2 and liquid ammonia evaporator 3, open pneumatic cut-off valve A210, pneumatic control valve B211 and ammonia bypass 5, ammonia in liquid ammonia storage tank 1 is directly supplied ammonia surge tank 4, by regulating the aperture of pneumatic control valve B211, by the value stabilization of pressure transmitter P27 in pressure set points.
Wherein, the pressure set points in the ammonia surge tank 4 described in above-mentioned steps is 0.2～0.6MPa.
Claims (1)
1. a liquefied ammonia vapo(u)rization system for novel energy-conserving, is characterized in that: it comprises liquid ammonia storage tank, liquefied ammonia transfer pump, liquid ammonia evaporator, ammonia surge tank, ammonia bypass, pressure transmitter P1, pressure transmitter P2, pneumatic cut-off valve A1, pneumatic control valve B1, pneumatic cut-off valve A2, pneumatic control valve B2 and liquefied ammonia vapo(u)rization system control module; Liquefied ammonia vapo(u)rization system control module is connected with pressure transmitter P1, pressure transmitter P2, pneumatic control valve B1, pneumatic control valve B2, pneumatic cut-off valve A1, pneumatic cut-off valve A2 and one end of liquefied ammonia transfer pump respectively by cable; The top of liquid ammonia storage tank is connected with one end of pressure transmitter P1, pneumatic cut-off valve A2 respectively by pipeline; The below of liquid ammonia storage tank is connected with one end of pneumatic cut-off valve A1 by pipeline; One end of liquefied ammonia transfer pump connects pneumatic cut-off valve A1, and the other end communicates with liquid ammonia evaporator, and liquid ammonia evaporator bottom is connected with steam pipeline and is provided with condensate drain outlet; Liquid ammonia evaporator top is connected with the entrance point of pneumatic control valve B1, and the port of export of pneumatic control valve B1 is connected to ammonia surge tank; Ammonia surge tank top is connected with one end of pressure transmitter P2, and its upper right quarter is provided with ammonia outlet, and its upper left quarter communicates with one end of ammonia bypass; The other end of ammonia bypass is connected with one end of pneumatic control valve B2, and the other end of pneumatic control valve B2 is connected with pneumatic cut-off valve A2;
This liquid ammonia storage tank is horizontal pressure vessel storage tank; This liquefied ammonia transfer pump is canned motor pump or no-leakage pump type; This liquid ammonia evaporator is vertical or horizontal intermediate medium heat exchanger; This ammonia surge tank is vertical pressure vessel storage tank; This pneumatic cut-off valve A1 is explosion-proof type pneumatic ball valve; This pneumatic control valve B1 is explosion-proof type pneumatic control valve; This pneumatic cut-off valve A2 is explosion-proof type pneumatic ball valve; This pneumatic control valve B2 is explosion-proof type pneumatic ball valve; This liquefied ammonia vapo(u)rization system control module adopts PLC or DCS control system; This pressure transmitter P1, pressure transmitter P2 are conventional pressure transmitters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320488286.3U CN203483880U (en) | 2013-08-12 | 2013-08-12 | Novel energy-saving liquid ammonia evaporation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320488286.3U CN203483880U (en) | 2013-08-12 | 2013-08-12 | Novel energy-saving liquid ammonia evaporation system |
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| CN203483880U true CN203483880U (en) | 2014-03-19 |
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| CN201320488286.3U Expired - Fee Related CN203483880U (en) | 2013-08-12 | 2013-08-12 | Novel energy-saving liquid ammonia evaporation system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103480162A (en) * | 2013-08-12 | 2014-01-01 | 北京博智伟德环保科技有限公司 | Novel energy-saving liquid ammonia evaporation system and control method thereof |
| CN105617835A (en) * | 2016-03-15 | 2016-06-01 | 新乡市天利自动化系统有限公司 | Automatic ammonia spraying control system for desulfurization and denitrification |
-
2013
- 2013-08-12 CN CN201320488286.3U patent/CN203483880U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103480162A (en) * | 2013-08-12 | 2014-01-01 | 北京博智伟德环保科技有限公司 | Novel energy-saving liquid ammonia evaporation system and control method thereof |
| CN105617835A (en) * | 2016-03-15 | 2016-06-01 | 新乡市天利自动化系统有限公司 | Automatic ammonia spraying control system for desulfurization and denitrification |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140319 Termination date: 20190812 |