Coking ammonia water distillation waste heat utilization device

Abstract

The invention discloses a coking ammonia water distillation waste heat utilization device, and belongs to the technical field of distillation waste heat utilization. The coking ammonia water distillation waste heat utilization device comprises a distillation tower provided with a distillation cavity, a raw material ammonia water inlet communicated with the distillation cavity and a distillation tower ammonia steam outlet; the fractional condenser is provided with a first heat exchange cavity inlet and a first heat exchange cavity outlet which are communicated with each other, a second heat exchange cavity inlet and a second heat exchange cavity outlet which are communicated with each other, and a first fractional condenser inlet and a second fractional condenser outlet which are communicated with each other; the second heat exchange cavity inlet and the second heat exchange cavity outlet are both used for being communicated with waste heat circulating water; wherein the first heat exchange cavity inlet is communicated with raw material ammonia water, and the first heat exchange cavity outlet is communicated with the raw material ammonia water inlet; an ammonia steam outlet of the distillation tower is communicated with an inlet of the first fractional condenser; the outlet of the second fractional condenser is used for discharging ammonia steam.

Description

Technical Field

[0001] The present application belongs to the technical field of distillation waste heat utilization, and in particular, relates to a coking ammonia water distillation waste heat utilization device. Background Art

[0002] The residual ammonia water produced in coking production and the rich ammonia water produced in the coal gas purification water washing ammonia process are generally distilled in an ammonia distillation tower using low-pressure steam as a heat source.

[0003] The waste heat in the distillation process mainly includes the waste heat of ammonia vapor at the top of the distillation tower and the waste heat of ammonia wastewater at the bottom of the distillation tower.

[0004] In the related art, the waste heat utilization of ammonia vapor at the top of the distillation tower is insufficient. Summary of the invention

[0005] The present application aims to solve the technical problem of insufficient utilization of waste heat of ammonia vapor at the top of a distillation tower during ammonia distillation at least to a certain extent. To this end, the present application provides a device for utilizing waste heat from ammonia distillation during coking.

[0006] The present application provides a device for utilizing waste heat from coking ammonia distillation, comprising:

[0007] A distillation tower, comprising a distillation chamber, an inlet for raw ammonia water communicated with the distillation chamber, and an outlet for ammonia vapor of the distillation tower;

[0008] A dephlegmator, comprising a first heat exchange chamber inlet and a first heat exchange chamber outlet in communication, a second heat exchange chamber inlet and a second heat exchange chamber outlet in communication, and a first dephlegmator inlet and a second dephlegmator outlet in communication; the second heat exchange chamber inlet and the second heat exchange chamber outlet are both used to communicate with waste heat circulating water;

[0009] Among them, the inlet of the first heat exchange chamber is used to communicate with the raw ammonia water, and the outlet of the first heat exchange chamber is connected to the raw ammonia water inlet; the ammonia vapor outlet of the distillation tower is connected to the inlet of the first condenser; and the outlet of the second condenser is used to discharge ammonia vapor.

[0010] In some embodiments, the distillation tower further comprises an ammonia reflux port connected to the distillation chamber;

[0011] The partial condenser also has an ammonia water outlet connected to both the first partial condenser inlet and the second partial condenser outlet;

[0012] The coking ammonia water distillation waste heat utilization device also includes a vapor-liquid separator, which has a separator ammonia vapor inlet, a separator ammonia water inlet, a separator ammonia vapor outlet and a separator ammonia water outlet; the separator ammonia vapor inlet is connected to the second condenser outlet; the separator ammonia water inlet is connected to the ammonia water outlet; the separator ammonia water outlet is connected to the ammonia water reflux port; the separator ammonia vapor outlet is used to discharge ammonia vapor.

[0013] In some embodiments, the coking ammonia water distillation waste heat utilization device also includes an ammonia vapor cooler, which has a connected cooler ammonia vapor inlet and a cooler ammonia water outlet, and also has a connected circulating cooling water inlet and a circulating cooling water outlet; the cooler ammonia vapor inlet is connected to the separator ammonia vapor outlet, and the cooler ammonia water outlet is used to discharge ammonia water; the circulating cooling water inlet and the circulating cooling water outlet are both used to connect with circulating cooling water.

[0014] In some embodiments, the decondenser comprises:

[0015] A first dephlegmator having the first dephlegmator inlet, a first heat exchange chamber inlet and the first heat exchange chamber outlet, and also having a first dephlegmator outlet communicating with the first dephlegmator inlet;

[0016] A second dephlegmator, having the second heat exchange chamber inlet, the second heat exchange chamber outlet, and the second dephlegmator outlet, and further having a second dephlegmator inlet connected to the second dephlegmator outlet, and the first dephlegmator outlet is connected to the second dephlegmator inlet;

[0017] The ammonia water outlet comprises a first ammonia water outlet and a second ammonia water outlet respectively arranged on the first partial condenser and the second partial condenser, and the first ammonia water outlet and the second ammonia water outlet are both connected to the separator ammonia water inlet.

[0018] In some embodiments, the coking ammonia distillation waste heat utilization device also includes an ammonia reflux pump (30), which is installed on a pipeline connecting the ammonia outlet of the separator and the ammonia reflux port, and is used to deliver the ammonia in the vapor-liquid separator into the distillation tower.

[0019] In some embodiments, the coking ammonia distillation waste heat utilization device also includes a mixer, which has a connected mixer inlet and mixer outlet; the mixer outlet is connected to the raw ammonia inlet; the mixer inlet is used to connect with the alkali solution, and the mixer inlet is connected to the first heat exchange chamber outlet.

[0020] In some embodiments, the distillation tower further comprises a distilled ammonia wastewater outlet and a low-pressure steam inlet connected to the distillation chamber;

[0021] The coking ammonia distillation waste heat utilization device also includes:

[0022] A stripping tower, the stripping tower comprising a stripping chamber and an ammonia evaporation wastewater inlet and a steam outlet connected to the stripping chamber; the ammonia evaporation wastewater inlet is connected to the ammonia evaporation wastewater outlet;

[0023] The ejector is provided with an ejector steam inlet and an ejector steam outlet. The ejector steam inlet is used to communicate with low-pressure steam and is connected to the steam outlet. The ejector steam outlet is connected to the low-pressure steam inlet.

[0024] In some embodiments, the distillation tower also has a stripping ammonia evaporated wastewater outlet connected to the distillation chamber; the coking ammonia distillation waste heat utilization device also includes a heat exchanger, the heat exchanger has a connected heat exchanger wastewater inlet and heat exchanger wastewater outlet, and also has a connected circulating hot water inlet and circulating hot water outlet; the heat exchanger wastewater inlet is connected to the stripping ammonia evaporated wastewater outlet; the circulating hot water inlet and the circulating hot water outlet are both used to connect with the waste heat circulating water.

[0025] In some embodiments, the coking ammonia distillation waste heat utilization device also includes a wastewater cooler, which has a connected cooler wastewater inlet and cooler wastewater outlet, and also has a connected circulating cooling water inlet and circulating cooling water outlet; the cooler wastewater inlet is connected to the heat exchanger wastewater outlet, and the cooler wastewater outlet is used to connect with a sewage treatment device; the circulating cooling water inlet and the circulating cooling water outlet are both used to connect with circulating cooling water.

[0026] In some embodiments, the coking ammonia distillation waste heat utilization device also includes a wastewater pump, which is installed on a pipeline connecting the stripping ammonia wastewater outlet and the heat exchanger wastewater inlet, and is used to send the ammonia wastewater in the distillation tower into the heat exchanger.

[0027] The present invention has at least the following beneficial effects:

[0028] The waste heat utilization device for the distillation of ammonia water from coking of the present invention makes full use of the waste heat of ammonia vapor at the top of the tower. After the raw ammonia water enters the dephlegmator, it exchanges heat with the ammonia vapor entering the dephlegmator from the inlet of the first dephlegmator, and the heat of the ammonia vapor is utilized, thereby increasing the temperature of the raw ammonia water entering the distillation tower and saving the low-pressure steam required for the distillation of ammonia water. The ammonia vapor after heat exchange is then exchanged with the low-temperature waste heat circulating water from the warm water type refrigeration unit or the heating heat exchanger that flows into the dephlegmator from the inlet of the second heat exchange chamber, so that the low-temperature waste heat circulating water is heated. After the low-temperature waste heat circulating water is heated, it becomes high-temperature waste heat circulating water, which flows out from the outlet of the second heat exchange chamber and is supplied to the warm water type refrigeration unit or the heating heat exchanger to make low-temperature water or heating water, etc., and the waste heat of the ammonia vapor at the top of the distillation tower is further utilized. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 A schematic diagram of a device for utilizing waste heat from coking ammonia distillation in one or more embodiments of the present application is shown.

[0031] Reference numerals: 100, coking ammonia distillation waste heat utilization device, 10, distillation tower, 10f, distillation chamber, 10a, raw ammonia inlet, 10b, distillation tower ammonia vapor outlet, 10c, ammonia reflux port, 10d, distillation ammonia wastewater outlet, 10e, low-pressure steam inlet, 20, partial condenser, 21, first partial condenser, 21a, first partial condenser inlet, 21b, first partial condenser outlet, 21c, first heat exchange chamber inlet, 21 d, first heat exchange chamber outlet, 21e, first ammonia water outlet, 22, second partial condenser, 22a, second partial condenser inlet, 22b, second partial condenser outlet, 22c, second heat exchange chamber inlet, 22d, second heat exchange chamber outlet, 22e, second ammonia water outlet, 20e, ammonia water outlet, 30-reflux pump, 40, vapor-liquid separator, 40a, separator ammonia vapor inlet, 40b, separator ammonia water inlet, 40c, separator ammonia vapor outlet 40d, separator ammonia outlet, 50, ammonia vapor cooler, 50a, cooler ammonia vapor inlet, 50b, cooler ammonia outlet, 50c, circulating cooling water inlet, 50d, circulating cooling water outlet, 65, mixer, 65a-mixer inlet, 65b, mixer outlet, 60, stripping tower, 60d, stripping chamber, 60a, ammonia wastewater inlet, 60b, steam outlet, 60c, stripping ammonia wastewater outlet, 70 , ejector, 70a, ejector steam inlet, 70b, ejector steam outlet, 80, heat exchanger, 80a, heat exchanger wastewater inlet, 80b, heat exchanger wastewater outlet, 80c, circulating hot water inlet, 80d, circulating hot water outlet, 85, wastewater pump, 90, wastewater cooler, 90a, cooler wastewater inlet, 90b, cooler wastewater outlet, 90c, circulating cooling water inlet, 90d, circulating cooling water outlet. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] The waste heat in the distillation process mainly includes the waste heat of ammonia vapor at the top of the distillation tower and the waste heat of ammonia wastewater at the bottom of the distillation tower. The purpose of cooling the ammonia vapor at the top of the tower is to condense and cool the ammonia vapor at the top of the tower into ammonia vapor or concentrated ammonia water, and the purpose of cooling the ammonia wastewater at the bottom of the tower is to cool the ammonia wastewater to ≤40℃ to meet the inlet temperature requirements of the sewage treatment device.

[0037] In the related technology, circulating cooling water is usually used to cool the ammonia vapor at the top of the tower and the ammonia wastewater at the bottom of the tower, and the waste heat is not fully utilized. In addition, considering the production of concentrated ammonia water at the top of the tower, each ton of ammonia water will consume 0.4-0.7MPa(g) low-pressure steam, 0.17-0.21t, 32-45℃ circulating cooling water, and 10-12m 3 , the consumption of low-pressure steam and circulating cooling water is large.

[0038] In the related art, there is a technical problem that the waste heat of ammonia vapor at the top of the distillation tower is insufficiently utilized. The embodiment of the present application provides a coking ammonia distillation waste heat utilization device 100, which can at least solve the technical problem of insufficient utilization of the waste heat of ammonia vapor at the top of the distillation tower during ammonia distillation to a certain extent.

[0039] The present application is described below with reference to the accompanying drawings and specific embodiments:

[0040] A device 100 for utilizing waste heat from the distillation of ammonia water for coking includes a distillation tower 10 and a partial condenser 20. The distillation tower 10 has a distillation chamber 10f and a raw ammonia water inlet 10a and a distillation tower ammonia vapor outlet 10b connected to the distillation chamber 10f. The partial condenser 20 has a first heat exchange chamber inlet 21c and a first heat exchange chamber outlet 21d connected, a second heat exchange chamber inlet 22c and a second heat exchange chamber outlet 22d connected, and a first partial condenser inlet 21a and a second partial condenser outlet 22b connected; the second heat exchange chamber inlet 22c and the second heat exchange chamber outlet 22d are both used to communicate with waste heat circulating water. Among them, the first heat exchange chamber inlet 21c is used to communicate with the raw ammonia water, and the first heat exchange chamber outlet 21d is connected to the raw ammonia water inlet 10a; the distillation tower ammonia vapor outlet 10b is connected to the first partial condenser inlet 21a; the second partial condenser outlet 22b is used to discharge ammonia vapor.

[0041] The waste heat circulating water flows into the partial condenser 20 from the second heat exchange chamber inlet 22c and flows out from the second heat exchange chamber outlet 22d. The raw ammonia water first enters the partial condenser 20 from the first heat exchange chamber inlet 21c, then flows out of the partial condenser 20 from the first heat exchange chamber outlet 21d, and finally enters the distillation chamber 10f of the distillation tower 10 from the raw ammonia water inlet 10a. The ammonia vapor in the distillation tower 10 is discharged through the distillation tower ammonia vapor outlet 10b, flows into the partial condenser 20 from the first partial condenser inlet 21a, and is discharged from the second partial condenser outlet 22b.

[0042] After the raw ammonia water enters the dephlegmator 20, it exchanges heat with the ammonia vapor entering the dephlegmator 20 from the first dephlegmator inlet 21a, and the heat of the ammonia vapor is utilized, thereby increasing the temperature of the raw ammonia water entering the distillation tower 10 and saving the low-pressure steam required for the distillation of the ammonia water. The ammonia vapor after heat exchange exchanges heat with the low-temperature waste heat circulating water from the warm water type refrigeration unit or the heating heat exchanger flowing into the dephlegmator 20 from the second heat exchange chamber inlet 22c, so that the low-temperature waste heat circulating water is heated, and the low-temperature waste heat circulating water becomes high-temperature waste heat circulating water after heating. The high-temperature waste heat circulating water flows out from the second heat exchange chamber outlet 22d and is supplied to the warm water type refrigeration unit or the heating heat exchanger for making low-temperature water or heating water, etc., and the waste heat of the ammonia vapor at the top of the distillation tower 10 is further utilized.

[0043] In summary, the waste heat utilization device 100 of the coking ammonia distillation of the present invention makes full use of the waste heat of the ammonia vapor at the top of the tower, and uses the waste heat of the ammonia vapor at the top of the distillation tower 10 to heat the raw ammonia water, thereby increasing the temperature of the raw ammonia water entering the distillation tower 10 and saving the low-pressure steam required for the distillation of ammonia water; the waste heat of the ammonia vapor at the top of the distillation tower 10 is also used to heat the waste heat circulating water, and the heated waste heat circulating water can be used for refrigeration or heating, while saving the energy-consuming working medium circulating cooling water.

[0044] In some embodiments, the distillation tower 10 also has an ammonia water reflux port 10c connected to the distillation chamber 10f; the condenser 20 also has an ammonia water outlet 20e connected to both the first condenser inlet 21a and the second condenser outlet 22b; the coking ammonia water distillation waste heat utilization device 100 also includes a vapor-liquid separator 40, the vapor-liquid separator 40 has a separator ammonia vapor inlet 40a, a separator ammonia water inlet 40b, a separator ammonia vapor outlet 40c and a separator ammonia water outlet 40d; the separator ammonia vapor inlet 40a is connected to the second condenser outlet 22b; the separator ammonia water inlet 40b is connected to the ammonia water outlet 20e; the separator ammonia water outlet 40d is connected to the ammonia water reflux port 10c; the separator ammonia vapor outlet 40c is used to discharge ammonia vapor.

[0045] The first partial condenser inlet 21a, the second partial condenser outlet 22b and the ammonia water outlet 20e are connected. After the ammonia vapor exchanges heat with the raw ammonia water and the waste heat circulating water, part of the ammonia vapor will be condensed and cooled into ammonia water, and discharged from the partial condenser 20 through the ammonia water outlet 20e, and the discharged ammonia water enters the vapor-liquid separator 40 through the separator ammonia water inlet 40b. The ammonia vapor flowing out of the second partial condenser outlet 22b enters the vapor-liquid separator 40 through the separator ammonia vapor inlet 40a. The ammonia vapor and the ammonia water are separated into vapor and liquid in the vapor-liquid separator 40, and the separated ammonia water is discharged from the vapor-liquid separator 40 through the separator ammonia water outlet 40d, and refluxed into the distillation tower 10 through the ammonia water reflux port 10c, thereby increasing the ammonia vapor concentration at the distillation tower ammonia vapor outlet 10b, and ensuring that the ammonia water distillation process continues. The separated ammonia vapor is discharged through the separator ammonia vapor outlet 40c.

[0046] In some embodiments, the coking ammonia distillation waste heat utilization device 100 further includes an ammonia reflux pump 30, which is installed on a pipeline connecting the separator ammonia outlet 40d and the ammonia reflux port 10c, and is used to send the ammonia in the vapor-liquid separator 40 into the distillation tower 10. The ammonia separated by the vapor-liquid separator 40 is sent back to the distillation tower 10 through the ammonia reflux pump 30.

[0047] In some embodiments, the coking ammonia distillation waste heat utilization device 100 also includes an ammonia vapor cooler 50, which has a connected cooler ammonia vapor inlet 50a and a cooler ammonia water outlet 50b, and also has a connected circulating cooling water inlet 50c and a circulating cooling water outlet 50d; the cooler ammonia vapor inlet 50a is connected to the separator ammonia vapor outlet 40c; the circulating cooling water inlet 50c and the circulating cooling water outlet 50d are both used to communicate with the circulating cooling water, and the cooler ammonia water outlet 50b is used to discharge ammonia water.

[0048] The separated ammonia gas is discharged through the separator ammonia gas outlet 40c and enters the cooler 50 through the cooler ammonia gas inlet 50a. The ammonia gas is condensed and cooled into ammonia water in the cooler 50 by the circulating cooling water flowing in from the circulating cooling water inlet 50c and discharged from the cooler ammonia water outlet 50b.

[0049] In some embodiments, the dephlegmator 20 includes a first dephlegmator 21 and a second dephlegmator 22. The first dephlegmator 21 has a first dephlegmator inlet 21a, a first heat exchange chamber inlet 21c and a first heat exchange chamber outlet 21d, and also has a first dephlegmator outlet 21b connected to the first dephlegmator inlet 21a; the second dephlegmator 22 has a second heat exchange chamber inlet 22c, a second heat exchange chamber outlet 22d and a second dephlegmator outlet 22b, and also has a second dephlegmator inlet 22a connected to the second dephlegmator outlet 22b, and the first dephlegmator outlet 21b is connected to the second dephlegmator inlet 22a; the ammonia water outlet 20e includes a first ammonia water outlet 21e and a second ammonia water outlet 22e respectively arranged on the first dephlegmator 21 and the second dephlegmator outlet 22e, and the first ammonia water outlet 21e and the second ammonia water outlet 22e are both connected to the separator ammonia water inlet 40b.

[0050] After such design, the ammonia gas discharged from the ammonia gas outlet 10b of the distillation tower first enters the first dephlegmator 21 through the first dephlegmator inlet 21a, exchanges heat with the raw ammonia water in the first dephlegmator 21, then flows out of the first dephlegmator 21 through the first dephlegmator outlet 21b, enters the second dephlegmator 22 through the second dephlegmator inlet 22a, exchanges heat with the waste heat circulating water in the second dephlegmator 22, and then is discharged into the vapor-liquid separator 40 through the second dephlegmator outlet 22b and the separator ammonia gas inlet 40a. The ammonia water formed by condensation and cooling in the first dephlegmator 21 is discharged from the first dephlegmator 21 through the first ammonia water outlet 21e under the action of gravity, and enters the vapor-liquid separator 40 through the separator ammonia water inlet 40b. The ammonia water formed by condensation and cooling in the second dephlegmator 22 is discharged from the second dephlegmator 22 through the second ammonia water outlet 22e under the action of gravity, and enters the vapor-liquid separator 40 through the separator ammonia water inlet 40b.

[0051] In some embodiments, the coking ammonia distillation waste heat utilization device 100 also includes a mixer 65, which has a connected mixer inlet 65a and a mixer outlet 65b; the mixer outlet 65b is connected to the raw ammonia inlet 10a; the mixer inlet 65a is used to communicate with the alkali solution, and the mixer inlet 65a is connected to the first heat exchange chamber outlet 21d.

[0052] In these embodiments, the first heat exchange chamber outlet 21d is connected to the mixer inlet 65a, which indirectly realizes the connection between the raw ammonia water inlet 10a and the first heat exchange chamber outlet 21d. The raw ammonia water is heated by heat exchange with the ammonia gas and then mixed with the alkali solution in the mixer 65. After being mixed, they enter the distillation chamber 10f of the distillation tower 10 through the raw ammonia water inlet 10a.

[0053] In some embodiments, the mixer 65 is a pipeline mixer 65 .

[0054] In some embodiments, the distillation tower 10 further has a distillation ammonia wastewater outlet 10d and a low-pressure steam inlet 10e connected to the distillation chamber 10f; the coking ammonia distillation waste heat utilization device 100 also includes a distillation tower 60 and an ejector 70, the distillation tower 60 has a distillation chamber 60d and an ammonia wastewater inlet 60a and a steam outlet 60b connected to the distillation chamber 60d; the ammonia wastewater inlet 60a is connected to the distillation ammonia wastewater outlet 10d; the ejector 70 has an ejector steam inlet 70a and an ejector steam outlet 70b, the ejector steam inlet 70a is used to communicate with the low-pressure steam, and is connected to the steam outlet 60b, and the ejector steam outlet 70b is connected to the low-pressure steam inlet 10e.

[0055] The ammonia wastewater at the bottom of the distillation tower 10 flows into the tray of the stripping tower 60 through the ammonia wastewater outlet 10d and the ammonia wastewater inlet 60a. The ammonia wastewater is subjected to negative pressure distillation in the stripping tower 60 to further reduce the ammonia nitrogen concentration in the ammonia wastewater. The ammonia nitrogen concentration in the ammonia wastewater sent out from the bottom of the stripping tower 60 can reach 50-100 mg / l. Since the steam outlet 60b is connected to the ejector 70, the external low-pressure steam will generate negative pressure in the stripping tower 60 when passing through the ejector 70. The ammonia wastewater in the stripping tower 60 absorbs the sensible heat of its own temperature drop under negative pressure and evaporates into steam. After that, it enters the ejector 70 through the steam outlet 60b and the ejector steam inlet 70a and mixes with the external low-pressure steam. The ejector steam outlet 70b mixes with the low-pressure steam and enters the lower part of the distillation tower 10 to provide a heat source for the distillation of the remaining ammonia water in the distillation chamber 10f, realizing the waste heat utilization of the ammonia wastewater and further saving the external low-pressure steam consumption.

[0056] In some embodiments, the distillation tower 60 also has a stripping ammonia evaporated wastewater outlet 60c connected to the distillation chamber 60d; the coking ammonia distillation waste heat utilization device 100 also includes a heat exchanger 80, the heat exchanger 80 has a connected heat exchanger wastewater inlet 80a and a heat exchanger wastewater outlet 80b, and also has a connected circulating hot water inlet 80c and a circulating hot water outlet 80d; the heat exchanger wastewater inlet 80a is connected to the stripping ammonia evaporated wastewater outlet 60c; the circulating hot water inlet 80c and the circulating hot water outlet 80d are both used to connect with the waste heat circulating water.

[0057] The ammonia evaporation waste water at the lower part of the distillation tower 60 is discharged from the stripping ammonia evaporation waste water outlet 60c and enters the heat exchanger 80 through the heat exchanger waste water inlet 80a, and exchanges heat with the low-temperature waste heat circulating water from the warm water type refrigeration unit or the heating heat exchanger that flows into the heat exchanger 80 from the circulating hot water inlet 80c, so that the low-temperature waste heat circulating water is heated. After the low-temperature waste heat circulating water is heated, it becomes high-temperature waste heat circulating water, which flows out from the circulating hot water outlet 80d and is supplied to the warm water type refrigeration unit or the heating heat exchanger for making low-temperature water or heating water, etc. The waste heat of the ammonia evaporation waste water is further utilized, and at the same time, the amount of energy-consuming working medium circulating cooling water is saved.

[0058] In some embodiments, the coking ammonia distillation waste heat utilization device 100 also includes a wastewater cooler 90, which has a connected cooler wastewater inlet 90a and a cooler wastewater outlet 90b, and also has a connected circulating cooling water inlet 90c and a circulating cooling water outlet 90d; the cooler wastewater inlet 90a is connected to the heat exchanger wastewater outlet 80b, and the cooler wastewater outlet 90b is used to connect with a sewage treatment device; the circulating cooling water inlet 90c and the circulating cooling water outlet 90d are both used to connect with the circulating cooling water.

[0059] After the heat exchange, the evaporated ammonia wastewater flows out through the wastewater outlet 80b of the heat exchanger, and then enters the wastewater cooler 90 through the wastewater inlet 90a of the cooler. In the wastewater cooler 90, the evaporated ammonia wastewater is cooled by the circulating cooling water flowing in from the circulating cooling water inlet 90c, and then discharged from the wastewater outlet 90b of the cooler to the sewage treatment device for treatment.

[0060] In some embodiments, the sewage treatment device is a phenol-cyanide sewage treatment device.

[0061] In some embodiments, the coking ammonia distillation waste heat utilization device 100 further includes a wastewater pump 85, which is installed on a pipeline connecting the stripping ammonia evaporation wastewater outlet 60c and the heat exchanger wastewater inlet 80a, and is used to send the ammonia evaporation wastewater in the distillation tower 60 into the heat exchanger 80. The ammonia evaporation wastewater discharged from the stripping ammonia evaporation wastewater outlet 60c is sent to the heat exchanger 80 through the wastewater pump 85.

[0062] In some embodiments, in order to meet the requirements of ammonia evaporation process parameters and waste heat utilization parameters, the temperature of ammonia vapor at the first condenser inlet 21a is 102-103°C, and the temperature of ammonia vapor at the second condenser outlet 22b is 90-96°C; the temperature of raw ammonia water at the first heat exchange chamber inlet 21c is 70-75°C, and the temperature of raw ammonia water at the first heat exchange chamber outlet 21d is 90-95°C; the temperature of low-temperature waste heat circulating water at the second heat exchange chamber inlet 22c is 63-65°C, and the temperature of high-temperature waste heat circulating water at the second heat exchange chamber outlet 22d is 73-75°C.

[0063] In some embodiments, the temperature of the ammonia wastewater at the bottom of the distillation tower 10 is 105-110°C, and the temperature of the ammonia wastewater at the bottom of the stripping tower 60 is 85-90°C.

[0064] The top pressure of the distillation tower 60 is related to the low-pressure steam pressure and flow rate of the ejector steam inlet 70a of the ejector 70. In some embodiments, the top pressure of the distillation tower 60 is controlled at -0.4 to -0.3 kPa (g).

[0065] In some embodiments, in order to meet the requirements of ammonia evaporation process parameters and waste heat utilization parameters, the temperature of the ammonia evaporation waste water entering the heat exchanger 80 is 85-90°C, and the temperature of the ammonia evaporation waste water leaving the heat exchanger 80 is 68-70°C; the temperature of the low-temperature waste heat circulating water entering the heat exchanger 80 is 63-65°C, and the temperature of the high-temperature waste heat circulating water leaving the heat exchanger 80 is 73-75°C.

[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0067] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0068] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A device for utilizing waste heat from distillation of coking ammonia water, characterized in that: include: A distillation tower (10) having a distillation chamber (10f), a raw material ammonia water inlet (10a) communicating with the distillation chamber (10f), and a distillation tower ammonia vapor outlet (10b); The dephlegmator (20) comprises a first heat exchange chamber inlet (21c) and a first heat exchange chamber outlet (21d) in communication, a second heat exchange chamber inlet (22c) and a second heat exchange chamber outlet (22d) in communication, and a first dephlegmator inlet (21a) and a second dephlegmator outlet (22b) in communication; the second heat exchange chamber inlet (22c) and the second heat exchange chamber outlet (22d) are both used for communicating with waste heat circulating water; The first heat exchange chamber inlet (21c) is used to communicate with the raw ammonia water, and the first heat exchange chamber outlet (21d) is connected to the raw ammonia water inlet (10a); the distillation tower ammonia vapor outlet (10b) is connected to the first partial condenser inlet (21a); ​​and the second partial condenser outlet (22b) is used to discharge ammonia vapor.

2. The device for utilizing waste heat from distillation of coking ammonia water according to claim 1, characterized in that: The distillation tower (10) further comprises an ammonia water reflux port (10c) connected to the distillation chamber (10f); The partial condenser (20) further comprises an ammonia water outlet (20e) which is in communication with both the first partial condenser inlet (21a) and the second partial condenser outlet (22b); The coking ammonia distillation waste heat utilization device (100) also includes a vapor-liquid separator (40), the vapor-liquid separator (40) having a separator ammonia vapor inlet (40a), a separator ammonia water inlet (40b), a separator ammonia vapor outlet (40c) and a separator ammonia water outlet (40d); the separator ammonia vapor inlet (40a) is connected to the second partial condenser outlet (22b); the separator ammonia water inlet (40b) is connected to the ammonia water outlet (20e); the separator ammonia water outlet (40d) is connected to the ammonia water reflux port (10c); the separator ammonia vapor outlet (40c) is used to discharge ammonia vapor.

3. The device for utilizing waste heat from distillation of coking ammonia water according to claim 2, characterized in that: The coking ammonia distillation waste heat utilization device (100) also includes an ammonia vapor cooler (50), the ammonia vapor cooler (50) having a cooler ammonia vapor inlet (50a) and a cooler ammonia water outlet (50b) that are connected, and also having a circulating cooling water inlet (50c) and a circulating cooling water outlet (50d) that are connected; the cooler ammonia vapor inlet (50a) is connected to the separator ammonia vapor outlet (40c), and the cooler ammonia water outlet (50b) is used to discharge ammonia water; the circulating cooling water inlet (50c) and the circulating cooling water outlet (50d) are both used to communicate with circulating cooling water.

4. The device for utilizing waste heat from distillation of coking ammonia water according to claim 2, characterized in that: The decondenser (20) comprises: A first dephlegmator (21) having the first dephlegmator inlet (21a), a first heat exchange chamber inlet (21c) and the first heat exchange chamber outlet (21d), and also having a first dephlegmator outlet (21b) communicating with the first dephlegmator inlet (21a); A second dephlegmator (22), comprising the second heat exchange chamber inlet (22c), a second heat exchange chamber outlet (22d) and a second dephlegmator outlet (22b), and further comprising a second dephlegmator inlet (22a) communicating with the second dephlegmator outlet (22b), wherein the first dephlegmator outlet (21b) is communicated with the second dephlegmator inlet (22a); The ammonia water outlet (20e) comprises a first ammonia water outlet (21e) and a second ammonia water outlet (22e) which are respectively arranged on the first partial condenser (21) and the second partial condenser (22); the first ammonia water outlet (21e) and the second ammonia water outlet (22e) are both connected to the separator ammonia water inlet (40b).

5. The device for utilizing waste heat from distillation of coking ammonia water according to claim 2, characterized in that: The coking ammonia distillation waste heat utilization device (100) also includes an ammonia reflux pump (30), which is installed on a pipeline connecting the separator ammonia outlet (40d) and the ammonia reflux port (10c) and is used to send the ammonia in the vapor-liquid separator (40) into the distillation tower (10).

6. The device for utilizing waste heat from distillation of coking ammonia water according to claim 1, characterized in that: The coking ammonia distillation waste heat utilization device (100) also includes a mixer (65), the mixer (65) having a mixer inlet (65a) and a mixer outlet (65b) that are connected; the mixer outlet (65b) is connected to the raw ammonia inlet (10a); the mixer inlet (65a) is used to communicate with the alkali solution, and the mixer inlet (65a) is connected to the first heat exchange chamber outlet (21d).

7. The device for utilizing waste heat from distillation of coking ammonia water according to any one of claims 1 to 6, characterized in that: The distillation tower (10) also has a distilled ammonia wastewater outlet (10d) and a low-pressure steam inlet (10e) which are connected to the distillation chamber (10f); The coking ammonia distillation waste heat utilization device (100) also includes: A stripping tower (60), the stripping tower (60) comprising a stripping chamber (60d) and an ammonia evaporation wastewater inlet (60a) and a steam outlet (60b) connected to the stripping chamber (60d); the ammonia evaporation wastewater inlet (60a) is connected to the ammonia evaporation wastewater outlet (10d); The ejector (70) has an ejector steam inlet (70a) and an ejector steam outlet (70b), wherein the ejector steam inlet (70a) is used to communicate with the low-pressure steam and is connected to the steam outlet (60b), and the ejector steam outlet (70b) is connected to the low-pressure steam inlet (10e).

8. The device for utilizing waste heat from distillation of coking ammonia water according to claim 7, characterized in that: The stripping tower (60) further comprises a stripping ammonia distillation wastewater outlet (60c) connected to the stripping chamber (60d); the coking ammonia distillation waste heat utilization device (100) further comprises a heat exchanger (80), the heat exchanger (80) comprising a heat exchanger wastewater inlet (80a) and a heat exchanger wastewater outlet (80b) connected to each other, and a circulating hot water inlet (80c) and a circulating hot water outlet (80d) connected to each other; the heat exchanger wastewater inlet (80a) is connected to the stripping ammonia distillation wastewater outlet (60c); the circulating hot water inlet (80c) and the circulating hot water outlet (80d) are both used for connecting to the waste heat circulating water.

9. The device for utilizing waste heat from distillation of coking ammonia water according to claim 8, characterized in that: The coking ammonia distillation waste heat utilization device (100) also includes a wastewater cooler (90), the wastewater cooler (90) having a cooler wastewater inlet (90a) and a cooler wastewater outlet (90b) that are connected, and also having a circulating cooling water inlet (90c) and a circulating cooling water outlet (90d) that are connected; the cooler wastewater inlet (90a) is connected to the heat exchanger wastewater outlet (80b), and the cooler wastewater outlet (90b) is used to be connected to a sewage treatment device; the circulating cooling water inlet (90c) and the circulating cooling water outlet (90d) are both used to be connected to circulating cooling water.

10. The device for utilizing waste heat from distillation of coking ammonia water according to claim 8, characterized in that: The coking ammonia distillation waste heat utilization device (100) also includes a wastewater pump (85), which is installed on a pipeline connecting the stripping ammonia wastewater outlet (60c) and the heat exchanger wastewater inlet (80a) and is used to send the ammonia wastewater in the distillation tower (60) into the heat exchanger (80).

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