CN211716562U - Fuel gas system is preheated to synthetic ammonia factory boiler blow off water - Google Patents
Fuel gas system is preheated to synthetic ammonia factory boiler blow off water Download PDFInfo
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- CN211716562U CN211716562U CN202020274937.9U CN202020274937U CN211716562U CN 211716562 U CN211716562 U CN 211716562U CN 202020274937 U CN202020274937 U CN 202020274937U CN 211716562 U CN211716562 U CN 211716562U
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- water
- heat exchanger
- synthetic ammonia
- fuel gas
- gas system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model discloses a preheating fuel gas system for sewage of a boiler of a synthetic ammonia plant, which comprises a waste water collecting box, wherein the waste water collecting box is connected with a sewage source of the boiler of the synthetic ammonia plant through a collecting pipeline; the waste water collecting tank is connected with a water inlet pipe and a water return pipe, and the water inlet pipe is connected with a booster pump. The application provides a synthetic ammonia factory boiler blow off water preheats fuel gas system utilizes boiler blow off water to realize preheating to combustible mixture as the heat source, need not to provide preheating equipment again, has energy-concerving and environment-protective advantage. The temperature of the combustible mixture formed by the gas and the air has important influence on the combustion performance of the burner, the combustible mixture is preheated, the initial temperature of the combustible mixture is increased, the flame temperature of the industrial furnace can be effectively increased, the combustion efficiency is improved, and the concentration of carbon monoxide in the flue gas is effectively reduced. Is worthy of large-area popularization and application.
Description
Technical Field
The utility model relates to a waste heat recovery recycles technical field, especially relates to a synthetic ammonia plant boiler blow off water preheats fuel gas system.
Background
Ammonia is an important chemical raw material, especially a raw material for producing chemical fertilizers, and is synthesized from hydrogen and nitrogen. The synthetic ammonia industry is the foundation of the nitrogen fertilizer industry. To produce ammonia, various fuels are typically used as feedstocks. First, it is made to contain H2And CO, and then removing dust and H in the gas by adopting various purification methods2S, organic sulfide, CO2And the like to obtain a clean 1: 3, finally, compressing the nitrogen-hydrogen mixed gas to more than 15Mpa, and synthesizing ammonia by the aid of a catalyst.
Gas making is essentially the reaction of carbon with oxygen and steam, with the main processes being blowing and gas making. The method is specifically divided into five stages of blowing, upward blowing, downward blowing, secondary upward blowing and air blowing. The raw material coal is intermittently fed into a fixed layer coal gas producer, air is firstly blown in to increase the furnace temperature, and then water vapor and nitrogen-added air are added to produce gas. And the produced semi-water gas enters a washing tower for dedusting and cooling, and is finally sent to a semi-water gas cabinet.
At present, about 50 sets of national ammonia synthesis devices are used, boiler sewage is directly discharged into a sewage system after low-pressure flash evaporation, and a large amount of heat energy in the boiler sewage is not recycled, so that waste is caused. Meanwhile, most of the cold air is directly injected into the device reformer to be mixed with fuel natural gas for combustion, so that the consumed fuel is high, and the operation cost of the equipment is increased.
SUMMERY OF THE UTILITY MODEL
The utility model provides a boiler blow-off water preheating fuel gas system of a synthetic ammonia plant.
The utility model provides a following scheme:
a kind of synthetic ammonia factory boiler blow off water preheats the fuel gas system, including:
the wastewater collection box is connected with a synthetic ammonia plant boiler sewage drainage source through a collection pipeline;
the waste water collecting tank is connected with a water inlet pipe and a water return pipe, and the water inlet pipe is connected with a booster pump; the inlet ends of the tube pass of the first heat exchanger and the tube pass of the second heat exchanger are respectively connected with the water inlet pipe, and the outlet ends of the tube pass of the first heat exchanger and the tube pass of the second heat exchanger are respectively connected with the water return pipe;
the inlet end of the shell pass of the first heat exchanger is connected with a combustible mixed gas source, and the outlet end of the shell pass of the first heat exchanger is connected with the inlet end of the shell pass of the second heat exchanger through an air pipe; and the outlet end of the shell side of the second heat exchanger is connected with a combustion chamber of the industrial furnace.
Preferably: the collecting pipeline and the water return pipe are communicated with the wastewater collecting box through the top of the wastewater collecting box; the bottom of the waste water collecting box is connected with a waste water discharge pipeline.
Preferably: and the water return pipe is connected with a three-way valve, and one outlet of the three-way valve is connected with the wastewater discharge pipeline.
Preferably: the three-way valve is an electric three-way valve, and a first temperature sensor is arranged on the water return pipe.
Preferably: and a second temperature sensor is arranged on the air pipe which is connected with the outlet end of the shell pass of the first heat exchanger and the inlet end of the shell pass of the second heat exchanger, and an electric two-way valve is arranged on the water inlet pipe.
Preferably: the boiler sewage source of the synthetic ammonia plant is a sewage source subjected to low-pressure flash evaporation.
Preferably: the first heat exchanger and the second heat exchanger are plate heat exchangers.
Preferably: the waste water collecting box is made of a stainless steel double-layer foaming heat-insulation plate.
Preferably: the wastewater collection box is provided with a magnetic turning plate water level sensor.
According to the utility model provides a concrete embodiment, the utility model discloses a following technological effect:
by the utility model, a preheating fuel gas system for the boiler blow-off water of the synthetic ammonia plant can be realized, and in an implementation mode, the system can comprise a waste water collecting box which is connected with a source of the boiler blow-off water of the synthetic ammonia plant through a collecting pipeline; the waste water collecting tank is connected with a water inlet pipe and a water return pipe, and the water inlet pipe is connected with a booster pump; the inlet ends of the tube pass of the first heat exchanger and the tube pass of the second heat exchanger are respectively connected with the water inlet pipe, and the outlet ends of the tube pass of the first heat exchanger and the tube pass of the second heat exchanger are respectively connected with the water return pipe; the inlet end of the shell pass of the first heat exchanger is connected with a combustible mixed gas source, and the outlet end of the shell pass of the first heat exchanger is connected with the inlet end of the shell pass of the second heat exchanger through an air pipe; and the outlet end of the shell side of the second heat exchanger is connected with a combustion chamber of the industrial furnace. The application provides a synthetic ammonia factory boiler blow off water preheats fuel gas system utilizes boiler blow off water to realize preheating to combustible mixture as the heat source, need not to provide preheating equipment again, has energy-concerving and environment-protective advantage. The temperature of the combustible mixture formed by the gas and the air has important influence on the combustion performance of the burner, the combustible mixture is preheated, the initial temperature of the combustible mixture is increased, the flame temperature of the industrial furnace can be effectively increased, the combustion efficiency is improved, and the concentration of carbon monoxide in the flue gas is effectively reduced. Is worthy of large-area popularization and application.
Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a connection block diagram of a preheating fuel gas system for boiler blow-off water of a synthetic ammonia plant provided by the embodiment of the utility model.
In the figure: the system comprises a wastewater collection box 1, a collection pipeline 2, a first heat exchanger 3, a second heat exchanger 4, a water inlet pipe 5, a water return pipe 6, a booster pump 7, a combustible mixed gas source 8, a combustion chamber 9 of the industrial furnace, a wastewater discharge pipeline 10, a three-way valve 11, a first temperature sensor 12, a second temperature sensor 13 and an electric two-way valve 14.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art all belong to the protection scope of the present invention.
Examples
Referring to fig. 1, a system for preheating fuel gas by using boiler blow-off water in a synthetic ammonia plant provided by an embodiment of the present invention is shown in fig. 1, and the system includes a wastewater collection box 1, wherein the wastewater collection box 1 is connected with a source of boiler blow-off water in the synthetic ammonia plant through a collection pipeline 2; specifically, the boiler blow-down water source 2 of the synthetic ammonia plant is a blow-down water source subjected to low-pressure flash evaporation. In order to improve the heat insulation performance of the waste water collection box, the waste water collection box 1 is made of a stainless steel double-layer foaming heat insulation plate. In order to be able to detect the water level in the waste water collection tank, the waste water collection tank 1 is provided with a magnetic flap level sensor. When the water level sensor detects that the water level in the collecting box is too low, the booster pump can be controlled to stop working, and the booster pump is prevented from idling to cause damage.
The waste water collecting tank 1 is connected with a water inlet pipe 5 and a water return pipe 6, and the water inlet pipe 5 is connected with a booster pump 7; the respective inlet ends of the tube pass of the first heat exchanger 3 and the tube pass of the second heat exchanger 4 are respectively connected with the water inlet pipe 5, and the respective outlet ends of the tube pass of the first heat exchanger 3 and the tube pass of the second heat exchanger 4 are respectively connected with the water return pipe 6; specifically, the first heat exchanger 3 and the second heat exchanger 4 are both plate heat exchangers.
The inlet end of the shell side of the first heat exchanger 3 is connected with a combustible mixed gas source 8, and the outlet end of the shell side of the first heat exchanger 3 is connected with the inlet end of the shell side of the second heat exchanger 4 through a gas pipe; the outlet end of the shell side of the second heat exchanger 4 is connected with a combustion chamber 9 of the industrial furnace. The combustible mixture may be a mixture of air and natural gas. Or a mixture of air and other combustible gases.
In order to ensure that the low-temperature wastewater in the wastewater collection tank can be discharged smoothly, the collection pipeline 2 and the water return pipe 6 are communicated with the wastewater collection tank 1 through the top of the wastewater collection tank 1; the bottom of the wastewater collection tank 1 is connected with a wastewater discharge pipeline 10. When the amount of wastewater in the wastewater collection tank 1 is too large, the water flow returned by the water return pipe can be directly discharged, and in order to realize the function, a three-way valve 11 is connected to the water return pipe 6, and one outlet of the three-way valve 11 is connected with the wastewater discharge pipeline 10. Further, the three-way valve is an electric three-way valve, and a first temperature sensor 12 is arranged on the water return pipe. This first temperature sensor 12 can detect the temperature in the return pipe in real time, and when detecting the temperature in the return pipe and cross lowly, can control electric three-way valve and directly discharge the water in the return pipe, prevent that low temperature water from getting into waste water collecting tank in a large number, cause the incasement water temperature to cross lowly and influence preheating effect.
Because the temperature of the mixed fuel gas is not too high, the embodiment of the application may further provide that a second temperature sensor 13 is disposed on the gas pipe connecting the outlet end of the shell side of the first heat exchanger 3 and the inlet end of the shell side of the second heat exchanger 4, and an electric two-way valve 14 is disposed on the water inlet pipe 5. When the second sensor detects that the temperature of the combustible mixed gas preheated by the first heat exchanger meets the preheating requirement, the flow of the water inlet pipe can be reduced through the electric two-way valve or the water flow supply can be cut off.
The application provides a synthetic ammonia factory boiler blow off water preheats fuel gas system utilizes boiler blow off water to realize preheating to combustible mixture as the heat source, need not to provide preheating equipment again, has energy-concerving and environment-protective advantage. The temperature of the combustible mixture formed by the gas and the air has important influence on the combustion performance of the burner, the combustible mixture is preheated, the initial temperature of the combustible mixture is increased, the flame temperature of the industrial furnace can be effectively increased, the combustion efficiency is improved, and the concentration of carbon monoxide in the flue gas is effectively reduced. Is worthy of large-area popularization and application.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (9)
1. The utility model provides a synthetic ammonia plant boiler blow off water preheats fuel gas system which characterized in that includes:
the wastewater collection box is connected with a synthetic ammonia plant boiler sewage drainage source through a collection pipeline;
the waste water collecting tank is connected with a water inlet pipe and a water return pipe, and the water inlet pipe is connected with a booster pump; the inlet ends of the tube pass of the first heat exchanger and the tube pass of the second heat exchanger are respectively connected with the water inlet pipe, and the outlet ends of the tube pass of the first heat exchanger and the tube pass of the second heat exchanger are respectively connected with the water return pipe;
the inlet end of the shell pass of the first heat exchanger is connected with a combustible mixed gas source, and the outlet end of the shell pass of the first heat exchanger is connected with the inlet end of the shell pass of the second heat exchanger through an air pipe; and the outlet end of the shell side of the second heat exchanger is connected with a combustion chamber of the industrial furnace.
2. The pre-heating fuel gas system for boiler blow-off water of synthetic ammonia plant as claimed in claim 1, wherein the collecting pipe and the water return pipe are both communicated with the wastewater collecting tank through the top of the wastewater collecting tank; the bottom of the waste water collecting box is connected with a waste water discharge pipeline.
3. The pre-heating fuel gas system for boiler blow-off water in a synthetic ammonia plant of claim 2 wherein a three-way valve is connected to the water return pipe, and one outlet of the three-way valve is connected to the wastewater discharge pipeline.
4. The pre-heating fuel gas system for the boiler blow-off water of the synthetic ammonia plant as claimed in claim 3, wherein the three-way valve is an electric three-way valve, and the water return pipe is provided with a first temperature sensor.
5. The pre-heating fuel gas system for the boiler blow-off water of the synthetic ammonia plant as claimed in claim 1, wherein a second temperature sensor is arranged on the gas pipe connecting the outlet end of the shell pass of the first heat exchanger and the inlet end of the shell pass of the second heat exchanger, and an electric two-way valve is arranged on the water inlet pipe.
6. The pre-heating fuel gas system for sewage of the synthetic ammonia plant boiler as set forth in claim 1, wherein the source of sewage of the synthetic ammonia plant boiler is a source of sewage subjected to low-pressure flash evaporation.
7. The pre-heating fuel gas system for boiler blow-off water of a synthetic ammonia plant of claim 1 wherein the first heat exchanger and the second heat exchanger are both plate heat exchangers.
8. The pre-heating fuel gas system for boiler blow-off water in a synthetic ammonia plant of claim 1, wherein the waste water collection tank is made of stainless steel double-layer foaming insulation board.
9. The pre-heating fuel gas system for boiler blow-off water of synthetic ammonia plant of claim 8 wherein the waste water collection tank is provided with a magnetic flap level sensor.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN202020274937.9U CN211716562U (en) | 2020-03-09 | 2020-03-09 | Fuel gas system is preheated to synthetic ammonia factory boiler blow off water |
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CN202020274937.9U CN211716562U (en) | 2020-03-09 | 2020-03-09 | Fuel gas system is preheated to synthetic ammonia factory boiler blow off water |
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CN211716562U true CN211716562U (en) | 2020-10-20 |
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CN202020274937.9U Expired - Fee Related CN211716562U (en) | 2020-03-09 | 2020-03-09 | Fuel gas system is preheated to synthetic ammonia factory boiler blow off water |
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2020
- 2020-03-09 CN CN202020274937.9U patent/CN211716562U/en not_active Expired - Fee Related
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CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201020 |
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