CN105112107A - Waste heat recovery and utilization system for semi-water gas in ammonia synthesizing process - Google Patents
Waste heat recovery and utilization system for semi-water gas in ammonia synthesizing process Download PDFInfo
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- CN105112107A CN105112107A CN201410715198.1A CN201410715198A CN105112107A CN 105112107 A CN105112107 A CN 105112107A CN 201410715198 A CN201410715198 A CN 201410715198A CN 105112107 A CN105112107 A CN 105112107A
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
The invention provides a waste heat recovery and utilization system for semi-water gas in ammonia synthesizing process. The semi-water gas produced from a gas furnace passes through a waste heat boiler, a scrubber tower, a desulfurization tower and a compressor in order, and enters a synthetic tower for synthesis, and a gas outlet of the waste heat boiler is connected with the scrubber tower by a heat exchanger; a graphite heat exchanger is provided between the desulfurization tower and the compressor. The waste heat recovery and comprehensive utilization system for semi-water gas employs a water fluid bed heat exchanger for reducing temperature of the semi-water gas, the recycled heat energy generates hot water for promoting a lithium bromide set to prepare cooling water which is used for the graphite heat exchanger to cool the semi-water gas at an inlet of the compressor, thereby realizing effective recovery and utilization of waste heat, increasing efficiency of the compressor and increasing output of ammonia synthesis.
Description
Technical field
The present invention relates to heat recovery technical field, be specifically related to a kind of waste heat recycling system for the synthesis of ammonia semi-water gas.
Background technology
Synthetic ammonia industry, fertilizer industry and coal chemical industry all relate to synthetic ammonia related process, ammonia synthesis process comprises several steps such as gasification, desulfurization, compression and ammonia synthesis, leads in scrubber tower and carry out washing, cooling after wherein solid fuel is vaporized into semi-water gas by gasification exactly.Because the temperature of semi-water gas is higher, and be wherein contained in a large amount of solid particulates.Easily gambling plug is carried out to general interchanger.So conventional waste heat boiler carries out heat exchange process at present.But its cooling-down effect is not obvious, be 150 DEG C-180 DEG C from waste heat boiler half-water gas temperature out, and containing a large amount of water vapour, after these semi-water gass enter scrubber tower, then need to carry out this water vapour of condensation by a large amount of water, and coal gas is lowered the temperature.In scrubber tower, the heat of semi-water gas is walked by gas washing water-band, causes energy wastage; Another reverse side drops into large number quipments and operation cost again to cool gas washing water, material is thus formed the repetition and waste of the energy.
In addition, the half-water gas temperature of the inlet mouth of compression section is higher, especially reaches more than 40 DEG C summer, thus affects compressor efficiency.By calculating, half-water gas temperature often reduces by 1 DEG C, and the efficiency of compressor just increases by 0.32%.So set up an interchanger to reduce half-water gas temperature at the inlet mouth of compression section, thus reach the efficiency improving compressor.
Summary of the invention
In order to solve the problem, the invention provides a kind of waste heat recycling system for the synthesis of ammonia semi-water gas, according to the feature of semi-water gas and synthetic ammonia compressor, effectively reclaim the waste heat of semi-water gas, and utilize the semi-water gas of this waste heat to the inlet mouth of compression section to lower the temperature, reach the object reducing energy consumption, improve output.
In order to achieve the above object, the invention provides a kind of waste heat recycling system for the synthesis of ammonia semi-water gas, the semi-water gas that gas furnace produces synthesizes by entering in synthetic tower after waste heat boiler, scrubber tower, thionizer, compressor successively, and the outlet side of described waste heat boiler is connected with scrubber tower by interchanger; Graphite heat exchanger is provided with between described thionizer and compressor.
Further, in order to make full use of the exchange board of water flow layer interchanger, the cooling water outlet end of feed-water end and lithium bromide chiller that described graphite changes hot device into is connected, and the heat source water of described lithium bromide chiller goes out with the water coolant of described heat exchange respectively into and out of end, inlet side is connected to form one and circulates.
Further, in semi-water gas, dust causes dust stratification serious greatly, and cause the problem that the heat exchange efficiency of tubular heat exchanger is not high, the present invention adopts water flow layer interchanger, described water flow layer interchanger comprises heat transfer tube, the inlet end of heat transfer tube is arranged with the shaped as frame tank be connected with heat transfer tube vertical seal, and its top passes tank and is positioned at above tank, and the heat transfer tube sidewall being positioned at tank inside is provided with prosopyle.
In order to make the water entered in heat transfer tube by prosopyle form equally distributed moisture film at heat transfer tube inwall, the top tube wall of described heat transfer tube is arranged with point water cap that cross section becomes N-shaped, and the inside length of point water cap is not less than the height of described tank.
So the present invention has following beneficial effect:
1, the present invention establishes a water flow layer interchanger between waste heat boiler and scrubber tower, by the half water coal further heat exchange cooling cooled through waste heat boiler, makes to reduce to about 90 DEG C from the temperature of interchanger semi-water gas out; Thus minimizing cools semi-water gas in scrubber tower, reduce cost.
2, graphite heat exchanger is set between thionizer and compressor simultaneously, the temperature of the semi-water gas after desulfurization is lowered the temperature further, is down to about 20 DEG C, thus greatly improve the working efficiency of compressor.
3, graphite heat exchanger water coolant is provided by lithium bromide chiller, and the heat source water of lithium bromide chiller goes out with the water coolant of water flow layer interchanger respectively into and out of end, inlet side is connected to form one and circulates; Make to be supplied to lithium bromide chiller after water coolant heat absorption in water flow layer interchanger to freeze as heat source water, take full advantage of recycle heat, energy-saving and cost-reducing.
4, the coefficient of heat transfer due to semi-water gas and water is larger, and the coefficient of heat transfer of water and carbon steel is larger, so the heat transfer rate of the water flow layer interchanger of the present invention's employing is high tens times, traditional tubular heat exchanger is that semi-water gas is direct and carbon steel carries out heat exchange, and its efficiency is low.
5, the heat transfer tube top in water flow layer interchanger is provided with a point water cap, make the water in tank the inwall of heat transfer tube formed equally distributed one deck flowing moisture film, make the transmission of heat evenly; And the dust entered in heat transfer tube is flushed to bottom it and collects by the moisture film that flows, and is finally taken out of by flowing water, avoids heat transfer tube laying dust and blocking; Solve its dew point corrosion problem simultaneously, add the work-ing life of heat transfer tube and interchanger.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is structural representation of the present invention.
Fig. 2 is water flow layer heat exchanger structure schematic diagram in the present invention;
In figure: 1, gas furnace, 2, waste heat boiler, 3, water flow layer interchanger, 3--1, heat transfer tube, 3-2, tank, 3-3, point water cap, 4, scrubber tower, 5, thionizer, 6, graphite heat exchanger, 7, compressor.8, lithium bromide chiller.
Embodiment
As shown in Figure 1, a kind of waste heat recycling system for the synthesis of ammonia semi-water gas, graphite heat exchanger 6 is provided with between thionizer 5 and compressor 7, the feed-water end of graphite heat exchanger 6 is connected with the cooling water outlet end of lithium bromide chiller 8, and the heat source water of described lithium bromide chiller 8 goes out with the water coolant of water flow layer interchanger 3 respectively into and out of port, inlet side is connected to form one and circulates.
The semi-water gas that gas furnace 1 produces once synthesizes by entering in synthetic tower after waste heat boiler 2, water flow layer interchanger 3, scrubber tower 4, thionizer 5, graphite heat exchanger 6, compressor 7.Its temperature controls as described below:
The semi-water gas of obtained about the 300 DEG C high temperature of gas furnace 1, reclaims temperature after a part of heat through waste heat boiler 2 and reduces to about 150 DEG C; Then ingoing stream moves in layer interchanger 3 and carries out heat exchange, actuator temperature is reduced to about 90 DEG C and is entered in scrubber tower 4, about 40 DEG C are reduced to by temperature after the washing of a small amount of recirculated water, cooling, then go to carry out desulfurization in thionizer 5 after roots blower pressurization, half-water gas temperature after desulfurization, at about 40 DEG C, finally enters in graphite heat exchanger 6 and after dark cooling temperature reduces to about 20 DEG C, enters compressor 7 compress.
The thermal source water outlet ingoing stream of about 75 DEG C of lithium bromide chiller 8 moves in layer interchanger 3 and carries out heat exchange simultaneously, makes its temperature be elevated to about 95 DEG C; The heat source water of 95 DEG C gets back to lithium bromide chiller 8 for the production of the cold water of 7 DEG C as thermal source, and this cold water of 7 DEG C is lowered the temperature to semi-water gas as the water coolant of graphite heat exchanger, and after heat exchange, temperature rises to 12 DEG C, then returns that lithium bromide chiller is cooled to be recycled.The heat source water of 95 DEG C is dropped to about 75 DEG C by temperature after lithium bromide water solution heat absorption simultaneously, and then water return flow layer interchanger 3 is utilized by heating cycle.
As shown in Figure 2, water flow layer interchanger 3 comprises heat transfer tube 3-1, and the inlet end of heat transfer tube 3-1 is arranged with the shaped as frame tank 3-2 be connected with heat transfer tube vertical seal, and its top passes tank and is positioned at above tank 3-2; The heat transfer tube 3-1 sidewall being positioned at tank inside is provided with individual prosopyle.The top tube wall of heat transfer tube 3-1 is arranged with point water cap 3-3 that cross section becomes N-shaped, and the inside length of point water cap 3-3 is not less than the height of tank 3-2.
Recirculated water in tank 3-2 is entered in heat transfer tube 3-1 by the prosopyle being located at heat transfer tube 3-1 upper portion side wall and manages, and by the departure cap 3-3 being set in heat transfer tube 3-1 top, the water entering heat transfer tube 3-1 is evenly distributed on the moisture film that its inwall forms one deck flowing.The semi-water gas heat of the high temperature entered in heat transfer tube 3-1 is passed to rapidly the flowing moisture film of heat transfer tube 3-1 inwall, flowing moisture film is at outer wall heat being delivered to heat transfer tube 3-1, improve its heat exchange efficiency, and avoid dust wearing and tearing or blocking in the accumulation of heat transfer tube 3-1 inwall.
Above embodiment is not limited only to this semi-water gas waste heat recovery utilization system protection domain, all modify based on present method thought or change all belong to protection scope of the present invention.
Claims (4)
1. the waste heat recycling system for the synthesis of ammonia semi-water gas, the semi-water gas that gas furnace produces synthesizes by entering in synthetic tower after waste heat boiler, scrubber tower, thionizer, compressor successively, and the outlet side of described waste heat boiler is connected with scrubber tower by interchanger; Graphite heat exchanger is provided with between described thionizer and compressor.
2. the waste heat recycling system for the synthesis of ammonia semi-water gas according to claim 1, it is characterized in that: the cooling water outlet end of feed-water end and lithium bromide chiller that described graphite changes hot device into is connected, the heat source water of described lithium bromide chiller goes out with the water coolant of described heat exchange respectively into and out of end, inlet side is connected to form one and circulates.
3. the waste heat recycling system for the synthesis of ammonia semi-water gas according to claim 1, it is characterized in that: described interchanger is water flow layer interchanger, described water flow layer interchanger comprises heat transfer tube, the inlet end of heat transfer tube is arranged with the shaped as frame tank be connected with heat transfer tube vertical seal, its top passes tank and is positioned at above tank, and the heat transfer tube sidewall being positioned at tank inside is provided with prosopyle.
4. the waste heat recycling system for the synthesis of ammonia semi-water gas according to claim 1, is characterized in that: the top tube wall of described heat transfer tube is arranged with point water cap that cross section becomes N-shaped, and the inside length of point water cap is not less than the height of described tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410715198.1A CN105112107A (en) | 2014-12-02 | 2014-12-02 | Waste heat recovery and utilization system for semi-water gas in ammonia synthesizing process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410715198.1A CN105112107A (en) | 2014-12-02 | 2014-12-02 | Waste heat recovery and utilization system for semi-water gas in ammonia synthesizing process |
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| CN105112107A true CN105112107A (en) | 2015-12-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104876241A (en) * | 2015-05-26 | 2015-09-02 | 安徽瀚洋节能科技有限公司 | Semi-water gas waste heat recycling system used for ammonia synthesis |
| CN107042032A (en) * | 2017-03-06 | 2017-08-15 | 江苏省特种设备安全监督检验研究院南通分院 | Energy-saving graphite multitube smoke duster, its method of work and its repair method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203700298U (en) * | 2014-01-21 | 2014-07-09 | 安徽节源节能科技有限公司 | Waste heat recovery and utilization system used for semi-water gas of ammonia synthesis |
| CN104006568A (en) * | 2014-05-06 | 2014-08-27 | 江苏华昌化工股份有限公司 | New method for applying lithium bromide refrigerating device in nitrogenous fertilizer production |
-
2014
- 2014-12-02 CN CN201410715198.1A patent/CN105112107A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203700298U (en) * | 2014-01-21 | 2014-07-09 | 安徽节源节能科技有限公司 | Waste heat recovery and utilization system used for semi-water gas of ammonia synthesis |
| CN104006568A (en) * | 2014-05-06 | 2014-08-27 | 江苏华昌化工股份有限公司 | New method for applying lithium bromide refrigerating device in nitrogenous fertilizer production |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104876241A (en) * | 2015-05-26 | 2015-09-02 | 安徽瀚洋节能科技有限公司 | Semi-water gas waste heat recycling system used for ammonia synthesis |
| CN107042032A (en) * | 2017-03-06 | 2017-08-15 | 江苏省特种设备安全监督检验研究院南通分院 | Energy-saving graphite multitube smoke duster, its method of work and its repair method |
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